Abstract
The Xiajinbao gold deposit is a medium-sized gold deposit in the Jidong gold province. Ore bodies mainly occur within the Xiajinbao granite porphyry and along the contact zone between the intrusion and Archean plagioclase hornblende gneiss. The zircon LA-ICP-MS age of the Xiajinbao granite porphyry yields 157.8 ± 3.4 Ma, which reflects the metallogenic age of the gold mineralization. Its petrographic features, major and trace element contents, zircon Hf isotopic model ages and compositional features all demonstrate that the Xiajinbao granitic magma is derived from partial melting of the Changcheng unit. The results of H–O isotopic analyses of auriferous quartz veins indicate that the ore-forming fluids are derived from magmatic waters that gradually mixed with meteoric waters during the evolution of the ore-forming fluids. S–Pb isotopic data indicate that the ore-forming fluids were mainly provided by the magma and by plagioclase hornblende gneisses. The gold metallogeny of the Xiajinbao gold deposit is temporally, spatially, and genetically associated with the high-K calc-alkaline-shoshonitic granitic magma emplaced during the Yanshanian orogeny and intruding the Archean plagioclase hornblende gneisses. These magmatic events mainly occurred during the period of 223–153 Ma and comprise three peak periods in the late Triassic (225–205 Ma), the early Jurassic (200–185 Ma) and the middle–late Jurassic (175–160 Ma), respectively. The metallogenic events in this area mainly occurred during the period of 223–155 Ma with the peak periods during the late Triassic (223–210 Ma) and the middle–late Jurassic (175–155 Ma), respectively. Both mineralization and magmatism occurred in a post-collisional tectonic setting related to the collision between the Mongolian plate and the North China plate at the end of the Permian. The magmatism of the early Jurassic occurred during the collision between the Siberian plate and the Mongolian plate, which caused the thickening and melting of the northern margin of the North China plate. The middle and late Jurassic magmatism and metallogenic activities are products of crustal thickening and partial melting during the Yanshanian intra-continental orogeny at the northern margin of the North China plate.
Highlights
More than 70% of China’s gold resources occur along the margins of the North China Craton (NCC) and in adjacent orogenic belts [1]. These include China’s most important gold deposits of the Jiaodong Peninsula, which is located along the eastern side of the NCC, and the Daqingshan, Yan-Liao, and Changbaishan gold provinces, which are located along the northern margin of the NCC [1]
The trace element spidergram patterns demonstrate fractional of the large-ion lithophile elements, resulting in enriched Rb, Ba and U contents and strongly depleted Nb, Ta, Sr, P, and Ti contents
Ma (Figure (Figure 10), 10), We present aa new new LA-ICP-MS
Summary
More than 70% of China’s gold resources occur along the margins of the North China Craton (NCC) and in adjacent orogenic belts [1]. These include China’s most important gold deposits of the Jiaodong Peninsula, which is located along the eastern side of the NCC, and the Daqingshan, Yan-Liao, and Changbaishan gold provinces, which are located along the northern margin of the NCC [1]. 117◦ 300 –119◦ 000 , Northing 40◦ 000 –40◦ 400 ) belongs to the Yan-Liao gold field This area is located at the SE margin of the Yanshanian tectonic belt, and at the northern part of the North China plate (Figure 1a).
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