Continental China Research Articles

Monitoring impacts of ecological engineering on ecosystem services with geospatial techniques in karst areas of SW China

Ecosystem services (ESs) synergies have been broadly studied, whose synergy control areas and driving mechanisms were still not fully understood. Here, We analyzed soil conservation (SC), water yield (WY), net primary productivity (NPP) and food supply (FS) on the basis of geospatial analysis techniques from 1992 to 2015. The results showed that the SW karst areas contributed 23.7% of SC and 14.56% of NPP with only 8.4% of China's continent. 49.28% of China’s land was synergy control areas, while accounted for 82.23% in the SW karst areas. The cause of this phenomenon was twofold, one was the significant increase in NDVI was mainly due to human activities (HA), and the coincidence rates between the HA dominated areas and the synergies control areas up to 90.7%. These results emphasized that ecological engineering was a key factor of the synergy among multi-ESs, the synergy control areas should be priority for ecological restoration.

Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records

The pre-Cenozoic northern South China Sea (SCS) Basin basement was supposed to exist as a complex of heterogeneous segments, divided by dozens of N–S faulting. Unfortunately, only the Hainan Island and the northeastern SCS region were modestly dated while the extensive basement remains roughly postulated by limited geophysical data. This study presents a systematic analysis including U-Pb geochronology, elemental geochemistry and petrographic identification on granite and meta-clastic borehole samples from several key areas. Constrained from gravity-magnetic joint inversion, this interpretation will be of great significance revealing the tectono-magmatic evolution along the southeastern margin of the Eurasian Plate. Beneath the thick Cenozoic sediments, the northern SCS is composed of a uniform Mesozoic basement while the Precambrian rocks are only constricted along the Red River Fault Zone. Further eastern part of the northern SCS below the Cenozoic succession was widely intruded by granites with Jurassic-to-early Cretaceous ages. Further western part, on the other hand, is represented by meta-sedimentary rocks with relatively sporadic granite complexes. To be noted, the western areas derived higher-degree and wider metamorphic zones, which is in contrast with the lower-degree and narrower metamorphic belt developed in the eastern region. Drastic collisions between the Indochina Block and South China continent took place since at least late Triassic, resulting in large-scale suturing and deformation zones. At the westernmost part of the northern SCS, the intracontinental amalgamation with closure of the Meso-Tethys has caused fairly stronger and broader metamorphism. One metamorphic biotite granite is located on the suturing belt and yields a Precambrian U-Pb age. It likely represents the relict from the ancient Gondwana supercontinent or its fringes. Arc-continental collision between the Paleo-Pacific and the southeast China Block, on the other hand, results in a relatively narrow NE-SW trending metamorphic belt during the late Mesozoic. Within the overall geological setting, the Cenozoic SCS oceanic basin was subsequently generated from a series of rifting and faulting processes along the collisional-accretionary continental margin.

Evolution of the Pearl River and its Implication for East Asian Continental Landscape Reversion

AbstractAs the link connecting the South China Continent and the northern South China Sea (SCS), the Pearl River is the focus of sedimentology and petroleum geology research. Its evolutionary process and controlling factors are of great significance in revealing the East Asian continental landscape reorganization during the Late Cenozoic. Based on published data, ‘source‐to‐sink’ provenance analyses allow systematic deliberation on the birth and evolutionary history of the Pearl River. Close to the Oligocene/Miocene boundary, an abrupt shift in the sedimentary composition indicates significant westward and northward expansion of the river's watershed area, followed by the establishment of a near‐modern fluvial network. This sedimentary change generally concurred with a series of regional geological events, including the onset of the Yangtze throughflow, large‐scale development of the loess plateau, and formation of the northwestern arid zone and Asian Monsoon system. These major changes in the geology‐climate‐ecoenvironment system are in close response to the process of the Cenozoic Xizang (Tibetan) Plateau uplift. Consequently, the East Asian continental landscape and most of mid‐Cenozoic drainage systems underwent critical reversion into east‐tilting, or east‐flowing networks.

Shallow seismic structure beneath the continental China revealed byP-wave polarization, Rayleigh wave ellipticity and receiver function

SUMMARYWe construct a high-resolution shallow 3-D seismic model in the top 10 km of the upper crust in the continental China, with constraints of P polarization, Rayleigh wave ellipticity and receiver function obtained from records of 3848 seismic stations. Our 3-D seismic model has a spatial resolution of 0.6–1.2° in the north–south seismic belt and the trans-north China orogen, and 1–2° in the rest of the continental China (except the Tarim basin and the southwest Tibet). The seismic model exhibits low velocity anomalies of deposits in major sedimentary basins and high velocity anomalies of crustal bedrocks in young orogenic belts and old tectonic blocks. The inferred sediment thickness maps display thick deposits in major sedimentary basins, some compacted sediments in the intermontane basins in young orogenic belts and little sediments in old tectonic blocks. We also discuss compaction effects of the sediments and implications of tectonic history and geological evolution of the major basins in the continental China based on the inferred seismic models. This study provides an effective mean of seismic imaging through joint inversion of various seismic constraints and establishes a framework of seismic data sharing for future studies in the seismological community in a first step of developing a China Seismological Reference Model.

Characterization and comparative analysis among plastome sequences of eight endemic Rubus (Rosaceae) species in Taiwan

Genus Rubus represents the second largest genus of the family Rosaceae in Taiwan, with 41 currently recognized species across three subgenera (Chamaebatus, Idaoeobatus, and Malochobatus). Despite previous morphological and cytological studies, little is known regarding the overall phylogenetic relationships among the Rubus species in Taiwan, and their relationships to congeneric species in continental China. We characterized eight complete plastomes of Taiwan endemic Rubus species: subg. Idaeobatus (R. glandulosopunctatus, R. incanus, R. parviaraliifolius, R rubroangustifolius, R. taitoensis, and R. taiwanicolus) and subg. Malachobatus (R. kawakamii and R. laciniastostipulatus) to determine their phylogenetic relationships. The plastomes were highly conserved and the size of the complete plastome sequences ranged from 155,566 to 156,236 bp. The overall GC content ranged from 37.0 to 37.3%. The frequency of codon usage showed similar patterns among species, and 29 of the 73 common protein-coding genes were positively selected. The comparative phylogenomic analysis identified four highly variable intergenic regions (rps16/trnQ, petA/psbJ, rpl32/trnL-UAG, and trnT-UGU/trnL-UAA). Phylogenetic analysis of 31 representative complete plastomes within the family Rosaceae revealed three major lineages within Rubus in Taiwan. However, overall phylogenetic relationships among endemic species require broader taxon sampling to gain new insights into infrageneric relationships and their plastome evolution.

FINANCIAL ASPECTS OF THE POLITICAL CRISIS IN HONG KONG

In article the interrelation of current political crisis in the Special administrative region of the People’s Republic of China Siangtan (Hong Kong) with change of its importance for transit of the capital from continental China in offshore jurisdictions and its return as part of transformation of a situation in the People’s Republic of China is considered. The conclusion about the serious financial reasons for development of crisis in the direction of strengthening of separatist sentiments in Hong Kong is drawn and related aggravation of a military-political situation.

A Study on Continent of china’s the Translation and Collation of the Thirteen Classics Annotated and Explicated in 40 Years

A Study on Continent of china’s the Translation and Collation of the Thirteen Classics Annotated and Explicated in 40 Years

Origin and Tectonic Implications of Post-Orogenic Lamprophyres in the Sulu Belt of China

Lamprophyre dykes that crosscut different types of ultrahigh pressure (UHP) metamorphic rocks are widely distributed in the Triassic Sulu UHP orogenic belt. Although abundant studies have been performed on these dykes, their origin and petrogenesis remain topics of controversy. This study presents the results of a detailed field-based study of petrology, whole-rock geochemistry and zircon U-Pb and Lu-Hf isotopes on lamprophyre dykes exposed in the central Sulu UHP zone, aiming at shedding lights on their petrogenesis and providing clues on the geological evolution of eastern continental China during the Cretaceous. The lamprophyres are typically porphyritic, with phenocrysts dominantly composed of amphibole and clinopyroxene set in a lamprophyric matrix. The dykes have moderate SiO2 (47.70 wt.%–60.44 wt.%), variably high MgO (2.58 wt.%–8.28 wt.%) and Fe2O3T (4.88 wt.%–9.26 wt.%) contents with high Mg# of 49–66. Geochemically, they have enriched light rare earth element (REE) and flat heavy REE patterns ((La/Gd)N=5.14–10.56; (Dy/Yb)N=1.43–1.54) with negligible Eu anomalies (Eu/Eu*=0.83–1.10), and they show enrichment in large ion lithophile elements (e.g., Ba and K) but depletion in high-field strength elements (e.g., Nb, Ti and P). In-situ zircon U-Pb geochronology reveals that the lamprophyres have concordant ages of 120–115 Ma, demonstrating that the dykes emplaced in the Early Cretaceous. These zircons have eHf(t) values ranging from −26.0 to −11.0. Inherited zircons that occur in the dykes are dated to be Neoproterozoic, in line with the protolith ages of their host (i.e., the UHP rocks). An integration of these data allows us to propose that the lamprophyres were generated during the Cretaceous, by melting of subcontinental lithospheric mantle-derived metasomatite with enriched chemical compositions underneath the North China Craton. The metasomatite was formed mainly by peridotite-fluid/melt reactions, with the fluids/melts mainly liberated from subducted Yangtze continental crust during the Triassic. Regional extension, lithospheric thinning and mantle upwelling caused by rollback of the subducted paleo-Pacific plate is considered to account for the generation of the lamprophyres as well as the extensive arc-like magmatic rocks in eastern continental China during the Early Cretaceous.

Recent Crustal Deformation Based on Interpolation of GNSS Velocity in Continental China

We used the interpolation method of two-dimensional vector velocity field data based on Green’s function to conduct coupled interpolation with a Poisson’s ratio of 0.5 for 1966 horizontal velocity field data from 1999 to 2017 and obtained the uniform velocity field and strain rate field with a grid of 1°. The main results are as follows: the eastern Himalayan structure as the center, the eastern Lhasa block, the eastern Qiangtang block, the Sichuan-Yunnan block, and the Burma block form a strong deformation rate zone of continuous deformation in the fan-shaped region, which has been a strong deformation rate zone for earthquakes of magnitude 7 or higher in continental China since 1963. Besides, the eastward movement of crustal material in the Tibetan Plateau is blocked by the stable South China block. Therefore, the direction of crustal material movement is deflected, which gradually forms a clockwise rotation motion system centered on the eastern Himalayan structure. Finally, our research shows that the influencing factors of strong earthquakes include velocity change, non-uniform strain distribution, accumulation of larger strain, and the difference of the second strain rate invariant. Strong earthquakes are closely related to the difference in energy accumulation in space.

Long-wavelength lithospheric magnetic field of China

SUMMARY We present new regional models, denoted CLAS, of the Chinese lithospheric field, combining the long-wavelength information provided by satellite-derived models: CHAOS-6, MF7, LCS-1 and NGDC720, and an extremely high-quality compilation of 97 994 aeromagnetic survey data with 10 km × 10 km resolution for shorter wavelength. The models are estimated using a depleted basis of global spherical harmonic functions centred on China. CLAS models are determined include harmonic degrees up to 400. Although some accuracy of aeromagnetic data is lost in order to balance the consistent of two data sets, the results show that CLAS models have a high correlation with the satellite models at low-degree terms (degree correlation > 0.9) but with more power at high-degree terms, reflecting more features of the lithospheric field in continental China. Examples of improvement include Changbai mountains, Sichuan Basin and Qinghai–Tibet Plateau. CLAS models have good agreement (coherence > 0.9) with Chinese aeromagnetic data at wavelength down to about 100 km (corresponding to spherical harmonic degree n = 400), filling the usual gap between satellite models and aeromagnetic data. Comparison with aeromagnetic data filtered at 100 km gives good agreement (correlation > 0.95). The residuals between CLAS models and aeromagnetic data are still large (rms > 70 nT), but with most of misfits arising from shorter wavelength fields that the model cannot fit at degree up to 400; such misfit could be reduced by increasing the model degree. We provide a geological example of how the inclusion of satellite data can change the geological conclusions that can be drawn from the magnetic information. However, the two data sets are not completely consistent, future models should start from a reanalysis of the aeromagnetic data and its line levelling to ensure consistency with the satellite model.

Changes in Extreme Precipitation Accumulations during the Warm Season over Continental China

AbstractPrecipitation accumulations, integrated over rainfall events, are investigated using hourly data across continental China during the warm season (May–October) from 1980 to 2015. Physically, the probability of precipitation accumulations drops slowly with event size up to an approximately exponential cutoff scale sL where probability drops much faster. Hence sL can be used as an indicator of high accumulation percentiles (i.e., extreme precipitation accumulations). Overall, the climatology of sL over continental China is about 54 mm. In terms of cutoff changes, the current warming stage (1980–2015) is divided into two periods, 1980–97 and 1998–2015. We find that the cutoff in 1998–2015 increases about 5.6% compared with that of 1980–97, with an average station increase of 4.7%. Regionally, sL increases are observed over East China (10.9% ± 1.5%), Northwest China (9.7% ± 2.5%), South China (9.4% ± 1.4%), southern Southwest China (5.6% ± 1.2%), and Central China (5.3% ± 1.0%), with decreases over North China (−10.3% ± 1.3%), Northeast China (−4.9% ± 1.5%), and northern Southwest China (−3.9% ± 1.8%). The conditional risk ratios for five subregions with increased cutoff sL are all greater than 1.0, indicating an increased risk of large precipitation accumulations in the most recent period. For high precipitation accumulations larger than the 99th percentile of accumulation s99, the risk of extreme precipitation over these regions can increase above 20% except for South China. These increases of extreme accumulations can be largely explained by the extended duration of extreme accumulation events, especially for “extremely extreme” precipitation greater than s99.

Collapsed upwelling and intensified euxinia in response to climate warming during the Capitanian (Middle Permian) mass extinction

The Middle Permian was marked by a major biotic crisis, in the Capitanian, and the termination of the long-lasting Gondwanan glaciation, which began in the Carboniferous. Eruption of the Emeishan large igneous province (ELIP) in South China may have been linked with this event and contemporary changes of ocean circulation. However, causal mechanisms linking the extinction with potential ELIP-climate-ocean co-variations remain poorly constrained. Here we have examined these themes by studying a deep-water section on the margin of the South China continent (lower Yangtze platform margin) region. Our results show chemical weathering increased from the Roadian to the Capitanian suggesting a change from a warm-humid to a hot-humid climate. This trend was enhanced at the time of ELIP eruption in the middle Capitanian. Using the Cd/Mo and Co x Mn proxies reveals that a strong coastal upwelling system with anoxic (but not euxinic) conditions and moderate-high productivity persisted for at least 10 m.y. on the Yangtze Platform margin. However, it abruptly collapsed in the middle Capitanian and then shifted to a relatively restricted but nutrient-enriched system with increased productivity and intensified anoxia. Climate warming slightly precedes these changes, making it likely that it was a primary trigger. Not only does warming slow down ocean circulation, it also promotes the delivery nutrients to the ocean through accelerated continental weathering. All contributed to the intensification and expansion of ocean anoxia-euxinia which occurred immediately prior to the Capitanian biotic crisis. Large-scale volcanic activity of the ELIP likely triggered these decoupled climate-ocean changes. An upwelling regime was re-established in the late Capitanian flowing a cooling that may have been caused by chemical weathering of the Emeishan flood basalts.

New data on the fauna of China, part II: the millipede genus Nepalmatoiulus Mauriès, 1983 (Diplopoda, Julidae) in continental China and Taiwan, with descriptions of seven new species.

Nepalmatoiulus is currently represented in continental China and Taiwan by twenty-five species. Seven new species of the genus are described from the China: Nepalmatoiulus lanpingensis sp. nov., Nepalmatoiulus uncinatus sp. nov., Nepalmatoiulus emarginatus sp. nov., Nepalmatoiulus deqenensis sp. nov., Nepalmatoiulus parvulus sp. nov., Nepalmatoiulus acutidentatus sp. nov., Nepalmatoiulus hexiensis sp. nov. Additional material for Nepalmatoiulus tianbaoshanensis Mikhaljova, 2020 is given. A key is given to all Nepalmatoiulus presently known from continental China and Taiwan Island. The distributions of Chinese and Taiwanese Nepalmatoiulus species are discussed. Taxonomic remarks are provided for nearly all new species.

Division of crustal units in China using grid-based clustering and a zircon U–Pb geochronology database

Zircon U–Pb dating is one of the most effective and widely used methods due to the widespread existence of zircon as an accessory mineral in rocks and its high closure temperature. Throughout history, each region of the earth has experienced its own crustal evolution. Using zircon U–Pb geochronology data, researchers can reveal the crustal growth history and regional discrimination. In this study, a large spatial analysis was performed across China, involving more than 120,000 data records taken from the zircon U–Pb geochronology database. By applying the Gaussian multipeak fitting method, nine age peaks corresponding to crustal growth events on the continent of China were identified, which centered at 45, 132, 249, 441, 815, 1236, 1908, 2505, and 2933 Ma. Using a grid-based clustering algorithm, grids with similar crustal growth event combinations were gathered and their features extracted. Based on the time series of the crustal growth events, the gathered grid clusters were further integrated into larger crustal units. We used various grid sizes in our algorithm, including 0.325 ° × 0.325 °, 0.4 ° × 0.4 °, 0.6 ° × 0.6 °, 0.8 ° × 0.8 °, 1.0 ° × 1.0 °, 1.2 ° × 1.2 °, and 1.4 ° × 1.4 °. Although the shape and number of the crustal units varied depending on grid size, six large entities were clearly identified and were best visualized using the 0.8 ° × 0.8 °, 1.0 ° × 1.0 °, 1.2 ° × 1.2 °, and 1.4 ° × 1.4 ° grids. These six entities include the Tibet-Sichuan-Yunnan, North Xinjiang, Northeast, Gansu-Qinghai, North China, and South China units. Furthermore, while there were some variations, the crustal unit results found herein were in agreement with tectonic unit research, displaying a new potential avenue of research.

Effects of continental emissions on cloud condensation nuclei (CCN) activity in the northern South China Sea during summertime 2018

Abstract. Aerosol particles in marine atmosphere have been shown to significantly affect cloud formation, atmospheric optical properties, and climate change. However, high temporally and spatially resolved atmospheric measurements over the sea are currently sparse, limiting our understanding of aerosol properties in marine atmosphere. In this study, a ship-based cruise campaign was conducted over the northern South China Sea (SCS) region during summertime 2018. The chemical composition of non-refractory PM1 (NR-PM1), the particle number size distribution (PNSD), and size-resolved cloud condensation nuclei (CCN) activity were measured by a time-of-flight aerosol chemical speciation monitor (ToF-ACSM) and the combination of a cloud condensation nuclei counter (CCNc) and a scanning mobility particle sizer (SMPS). Overall, aerosol particles exhibited a unimodal distribution centering at 60–80 nm and the chemical composition of the NR-PM1 was dominated by sulfate (∼ 46 %), which likely originated from anthropogenic emissions rather than dimethyl sulfide (DMS) oxidation. Two polluted episodes (P1 and P2) were observed, and both were characterized by high particle number concentrations (NCN) which originated from local emissions and from emissions in inland China via long-range transport. The concentrations of trace gases (i.e., O3, CO, NOx) and particles (NCN and NCCN at ss = 0.34 %) were elevated during P2 at the end of the campaign and decreased with offshore distance, further suggesting important impacts of anthropogenic emissions from the inland Pearl River Delta (PRD) region. Two relatively clean periods (C1 and C2) prior to and after tropical storm Bebinca were classified and the air was affected by air masses from the southwest and from the Indo-Chinese Peninsula, respectively. Chemical composition measurements showed an increase in organic mass fraction during P2 compared to C2; however, no obviously different κ values were obtained from the CCNc measurements, implying that the air masses carried pollutants from local sources during long-range transport. We report an average value of about 0.4 for the aerosol hygroscopicity parameter κ, which falls within the literature values (i.e., 0.2–1.0) for urban and remote marine atmosphere. In addition, our results showed that the CCN fraction (NCCN∕NCN, tot) and the κ values had no clear correlation either with the offshore distance or with concentrations of the particles. Our study highlights dynamical variations in particle properties and the impact of long-range transport from continental China and the Indo-Chinese Peninsula on the northern SCS region during summertime.

Tonian Tectonic‐Strata Regions and their Geological Significance in China

AbstractThe continent of China developed through the coalescence of three major cratons (North China, Tarim and Yangtze) and continental micro‐blocks through the processes of oceanic crust disappearance and acceretionary‐collision of continental crusts. The strata of the Chinese continental landmass are subdivided into 12 tectonic‐strata regions. Based on the composition of geological features among the three main cratons, continental micro‐blocks and other major global cratons, their affinities can be preliminarily deduced during the Tonian period, using evidence from sedimentary successions, paleobiogeography, tectonic and magmatic events. The Yangtze and Tarim cratons show that they have close affinities during the assembly‐dispersal milestone of the Rodinia Supercontinent. The sedimentary record and magmatic age populations in the blocks suggest that there was a widespread, intensive magmatic event that resulted from a subduction process during ∼1000–820 Ma, related to continental rifting around the Yangtze and Tarim cratons. However, they differ greatly from the North China Craton. The continental micro‐blocks in the Panthalassic Ocean could have some missing connection with the North China Craton that persisted until the Middle‐Late Devonian. In contrast, the Alxa Block showed a strong affinity with the Tarim Craton. The revised Tonian paleogeography of the Rodinia Supercontinent is a good demonstration of how to show the relationship between the main cratons and the continental micro‐blocks.

Three new species of Synergini wasps from same galls on Lithocarpus glaber (Thunb.) in Hunan, China (Hymenoptera, Cynipidae)

Three new species of the tribe Synergini (Hymenoptera, Cynipidae), i.e., Lithosaphonecrus arcoverticus Liu, Zhu et Pang, sp. n. Lithosaphonecrus decarinatus Liu, Zhu et Pang, sp. n. and Saphonecrus emarginatus Liu, Zhu et Pang, sp. n. are described from Hunan, China. The three species have emerged from the same galls collected on Lithocarpus glaber (Thunb.) in December, June, and April, respectively. Phylogenetic reconstruction of Synergini based on mtDNA COI and rRNA 28S D2 genes resolved two independent monophyletic clades exclusively associated with Lithocarpus plant hosts, i.e., the genus Lithosaphonecus and the lithocarpii species complex of Saphonecrus. The three species each have a sister relationship with a congener in Taiwan, an island off the southeastern coast of continental China. This recurrent disjunct distribution and relatively low COI sequence variation between the sister species in each species pair are considered attributable to the formation of the Taiwan Strait in Holocene ca 10,000 years ago. We also discussed the possible speciation mechanism for Lithosaphonecrus due to seasonality and topography in subtropical China. Finally, we addressed the need for conservation consideration in urbanization planning.

Surgical and Clinical Reactivation for Elective Procedures during the COVID-19 Era: A Global Perspective

Surgical and Clinical Reactivation for Elective Procedures during the COVID-19 Era: A Global Perspective

Inversion of polyphase calcite-twin data for deviatoric stress tensors: 2. Application to the Huangling Dome, northern South China

The north-trending Huangling Dome, located on the northern margin of the reactivated Yangtze Platform, provides an appropriate place to understand the complexity of intraplate deformation of the South China continent since the Early Mesozoic. In this study, palaeostress analysis using calcite twins was carried out to address the deformation mechanism of the dome, poorly understood at present. Ten limestone samples and three marble samples were collected from the platform cover on the eastern and western flanks and the core basement, measured under the universal stage, and inverted for stress analysis using our recently proposed method. All the stress estimates for the samples were classified into two layer-parallel shortening (LPS) subsets and two non-LPS subsets. They represent NW–SE compression, NE–SW compression, N–S compression, and N–S or E–W extension, respectively, in correspondence to principal tectonic events since the Early Mesozoic. They do not verify existing explanations about the genesis of the dome, for example, extrusion-induced E–W compression and differential uplift-related E–W extension. A new formation model was therefore proposed: under the nearly N–S compression, the dome initiates as an E–W trending brachy anticline and, owing to basement inheritance and variation of regional shortening, gains the current configuration.

Triassic gold-silver metallogenesis in Qingchengzi orefield, North China Craton: Perspective from fluid inclusions, REE and H–O–S–Pb isotope systematics

The Qingchengzi Au–Ag orefield is a key Au province in the North China Craton. The fault-controlled orebodies are hosted in the Paleoproterozoic meta-sedimentary rocks of the Dashiqiao and Gaixian Formations. We present new bulk-ore REE, fluid inclusion (FI) microthermometric and mineral H–O–S–Pb isotopic data of these Au–Ag deposits, and discuss their ore fluid/material source and metallogenesis. Our FI microthermometric data indicate that the ore fluids are of medium temperatures (260–310 °C), low salinity (≤10 wt% NaCl eq.), and belonged to a H2O–CO2–NaCl system. Hydrogen (δD = –6.5 to 9.1‰) and oxygen (δ18O = –139.4 to –90.1‰) isotopes of the hydrothermal quartz indicate that the early-stage ore-forming fluids were mainly magmatic sourced. The δ34S values (–12.5 to 18.7‰) of the ore sulfides overlap with the Paleoproterozoic ore host (δ34S = –0.5 to 13.2‰) and the Late Triassic granites (δ34S = 5.6–7.6‰). Lead isotope compositions of the ore sulfides (206Pb/204Pb = 17.269–18.334; 207Pb/204Pb = 15.335–15.883; 208Pb/204Pb = 37.254–38.784) also support a metallogenic link with the granites and wall-rocks. Therefore, we suggest that the Qingchengzi Au–Ag deposits are best classified as magmatic-related medium-temperature hydrothermal lode type, albeit spatial correlations with magmatic intrusions are not ubiquitous. Closer to the hydrothermal centers, the higher-temperature, magmatic-dominated fluids were responsible to generate the Au(-Ag) mineralization, whereas the more distal, lower-temperature magmatic-meteoric-mixed fluids may have formed the Ag and Pb–Zn mineralization. The ore-forming fluids and materials were likely sourced mainly from the Triassic granitoids, although significant contributions of ore metals and sulfur from the Au-/Ag-rich Dashiqiao and Gaixian Formations should not be neglected. Considering the regional tectonic setting, the Late Triassic Qingchengzi Au–Ag polymetallic mineralization may have occurred during the post-collisional extension after the Yangtze-North China continent–continent collision.