Geochronological, Geochemical and Sr-Nd Isotopic Characteristics of Carboniferous Rock Mass in Bayern Daba Area, Inner Mongolia and Its Constraints on Central Asian Orogenic Belt

被引：0
|
作者：
Zhang Y. [1 ]
Zhou Y. [1 ]
Dong Y. [2 ]
Li C. [3 ]
Wang G. [3 ]
机构：
[1] Shenyang Center of China Geological Survey, Shenyang
[2] Liaoning Geological and Mineral Survey Institute Company Limited, Shenyang
[3] Liaoning Chemical Geological Survey Institute Company Limited, Jinzhou
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 04期
关键词：
Active continental margin; Bayern Daba rock mass; Paleo-Asian Ocean; Petrology; Sr-Nd isotope;
D O I：
10.3799/dqkx.2021.059
中图分类号：
学科分类号：
摘要：
In order to examine the magma origin and tectonic setting of the Bayern Daba rock mass in Inner Mongolia and thereby limit the closure of the paleo-Asian Ocean, zircon LA-ICP-MS U-Pb geochronological, geochemical and Sr-Nd isotopic measurement and analysis are presented in this paper. Zircon U-Pb dating yields a weighted mean age of 327±2 Ma(MSWD=1.4), indicating an Early Carboniferous magmatic event. The Bayern Daba rock mass is characterized by the high Si, Na, Mg, Fe and metaluminous-peraluminous features. They are relatively enriched in Rb, Th, U and K, depleted in Ba, Sr, P, Nb, Ta and Ti, and enriched in LREE over HREE with negative Eu anormaly, showing the calc-alkaline I-type granite in island arc. Their depleted isotopic compositions with (87Sr/86Sr)i from 0.705 8 to 0.709 6, negative εNd(t) values from -4.93 to 0.01, and TDM2 from 1.08 to 1.48 Ga, as well as the inherited zircon present in zircon, indicating that the magma source was derived from the partial melting of Mesoproterozoic mantle-derived basic materials. High Rb/Sr (0.70-2.63) and Zr/Hf (35.88-77.17) ratios and the positive correlation of ISr and εNd(t) isotopic data suggest contamination by a proportion of mantle material. Combined with regional tectonic evolution, the Bayern Daba rock mass was formed in the island-arc environment of an active continental margin in Carboniferous, which further suggests that the subduction of the paleo-Asian Ocean was still ongoing at that time. The same conclusion is also reported about the Early Permian intermediate-acidic rock masses in the southern part of the Xing-Meng orogenic belt, suggesting that the paleo-Asian Ocean had been subducting northward from Late Carboniferous up to Late Permian and did not fully close until the appearance of granitoids formed in a post-orogenic extensional environment in Middle to Late Triassic. © 2022, Editorial Department of Earth Science. All right reserved.
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页码：1234 / 1252
页数：18
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