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Abstract
The Da Hinggan Mountains are an important area in the tectonic evolution of the Central Asian Orogenic Belt (CAOB), and there are disputes over the closure time of the Paleo-Asian Ocean and the amalgamation spatiotemporal relationship between the Ergun-Hinggan Massif and the Songnun Massif. The geochronology and geochemistry of the Late Cambrian-Late Silurian volcanic rock assemblages in the ARong Qi area at the eastern margin of the Da Hinggan Mountains are studied in this paper. The results suggest that the U-Pb zircon ages of the Late Cambrian, Late Ordovician and Late Silurian volcanic rock assemblages are 507.5 ± 1.0 Ma, 456.2 ± 1.0 Ma, 446.1 ± 0.95 Ma and 423.3 ± 1.4 Ma, respectively. The Late Cambrian-Late Silurian volcanic rocks are quasi-aluminous-peraluminous, belonging to calc-alkaline-shoshonite series, which is rich in HREE but has insignificant europium anomalies. There are abundant large ion lithophile elements (LILE) in the rock, and remarkable Nb, Ta and Ti negative anomalies. The previous data and the current study indicate that a continental margin arc tectonic setting existed in the ARong Qi-Zalantun region during the Early Paleozoic, which is inferred to be the product of the subduction-accretion-amalgamation of the plates along the eastern margin of the Ergun Massif during the Early Paleozoic.
Highlights
IntroductionWith the deep-going studies on Northeast China and the accumulation of some geochemical and isotopic test data, it is generally accepted that several micro-terranes and multiple convergence belts form the basic geotectonic pattern of Northeast China
Previous studies hold that the Ergun Massif and the Hinggan Massif merge along the Tayuan-Xijiatu Fault, and the Late Paleozoic Ergun-Hinggan Massif and the Jiamusi-Songnen Massif amalgamate along the Hegen Mountain-Nenjiang River-Heihe River area [1–9]
According to the 2005 geological survey report at a 1:250,000 scale on the topographic map of the A’Rong Qi area issued by the third geological team from the Qiqihar Branch of the Heilongjinag General Institute of Ecological Survey and Research and the latest data, the Zalantun Group in the western part of A’Rong Qi in the study area has long been considered a Paleoproterozoic metamorphic series representing the Precambrian basement of the Hinggan and Ergun Massifs
Summary
With the deep-going studies on Northeast China and the accumulation of some geochemical and isotopic test data, it is generally accepted that several micro-terranes and multiple convergence belts form the basic geotectonic pattern of Northeast China. Previous studies hold that the Ergun Massif and the Hinggan Massif merge along the Tayuan-Xijiatu Fault, and the Late Paleozoic Ergun-Hinggan Massif and the Jiamusi-Songnen Massif amalgamate along the Hegen Mountain-Nenjiang River-Heihe River area [1–9]. The volcanic rocks in the Da Hinggan Mountains have been considered as Mesozoic medium-acidic volcanic rocks [10–15]. The Paleozoic especially Early Paleozoic volcanic rocks, mostly Ordovician volcanic rocks and granitic amphibolites, are less exposed, and their magmatic activities are concentrated in the Duobaoshan area, east of the Hinggan [16–18]. The Zalantun Group, west of ARong Qi, has been considered a Paleoproterozoic metamorphic series, representing the Precambrian basement of the Hinggan and Ergun Massifs. This age range suggests that the Zalantun Group emerged in the
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