Petrogenesis and geodynamic implications of two episodes of Permian and Triassic high-silica granitoids in the Chinese Altai, Central Asian Orogenic Belt

Lin Zhengfan; Yuan Chao; Zhang Yunying; Sun Min; Long Xiaoping; Wang Xinyu; Huang Zongying; Chen Zhiwei

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Petrogenesis and geodynamic implications of two episodes of Permian and Triassic high-silica granitoids in the Chinese Altai, Central Asian Orogenic Belt

机译：中国阿尔泰，中亚造山带二叠系和三叠系高硅质花岗岩的两次成因及地球动力学意义

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Tectonic transition from post-collision to intraplate settings is a crucial process in orogenic belts. To characterize such a transition in the Chinese Altai, we conduct an integrated study on Permian to Triassic granitoids. Zircon U-Pb dating reveals that the granitoids can be subdivided into two stages: early Permian (291-286 Ma) and late Triassic (216-209 Ma). Granitoids of both two stages exhibit high SiO2, low Mg#, low Cr and Ni contents, and variable Sr-Nd-Hf isotopes, all of which indicate a multiple crustal origin. Generally, the Triassic granitoids have similar epsilon Nd(t) but relatively higher epsilon Hf(t) values than those of the Permian granitoids. Moreover, the Triassic granitoids possess relatively higher ASI and more variable Al2O3/TiO2, CaO/Na2O, Rb/Sr and Rb/Ba values than those of the Permian granitoids, suggesting that the Triassic magmatic sources were much variable and complicated with higher proportions of sediments. By integrating regional data, two magmatic peaks at Permian and Triassic can also be recognized. From early Permian to Triassic, the SiO2, Na2O + K2O and Th contents, ASI and Sr-87/ Sr-86, Al2O3/TiO2, Rb/Sr and Rb/Ba values for the felsic rocks gradually increase, implying more and more strongly reworking of continental crust. Also, the Rb, Y + Nb and Yb + Ta concentrations for felsic rocks progressively increase from early Permian to Triassic, demonstrating a geodynamic evolution from syn/post-collision to intraplate settings. Furthermore, we propose that the post-collision and intraplate tectonism, especially the latter, could facilitate the generation of high-silica granites, which drive maturation of continental crust in accretionary orogenic belts.

机译：从碰撞后构造到板内构造的构造转变是造山带中的关键过程。为了表征中国阿尔泰地区的这种过渡，我们对二叠纪到三叠纪花岗岩进行了综合研究。锆石U-Pb测年表明，花岗岩可分为两个阶段：二叠纪早期（291-286 Ma）和三叠纪晚期（216-209 Ma）。这两个阶段的类花岗岩都具有较高的SiO2，较低的Mg＃，较低的Cr和Ni含量以及可变的Sr-Nd-Hf同位素，所有这些都表明其地壳是多重的。一般而言，三叠纪花岗岩类的εNd（t）与二叠纪花岗岩类的εHf（t）值相对较高。此外，与二叠纪花岗岩相比，三叠纪花岗岩具有相对较高的ASI和较高的Al2O3 / TiO2，CaO / Na2O，Rb / Sr和Rb / Ba值，这表明三叠纪岩浆源变化较大且复杂，且比例较高。沉积物。通过整合区域数据，还可以识别出二叠纪和三叠纪的两个岩浆峰。从早二叠世到三叠纪，长英质岩石的SiO2，Na2O + K2O和Th含量，ASI和Sr-87 / Sr-86，Al2O3 / TiO2，Rb / Sr和Rb / Ba值逐渐增加，这意味着越来越强烈。大陆壳的再造。同样，长英质岩石的Rb，Y + Nb和Yb + Ta浓度从早二叠世到三叠纪逐渐增加，表明了从同/后碰撞到板内环境的地球动力学演变。此外，我们认为，碰撞后板内构造，尤其是板内构造，可以促进高硅花岗岩的生成，从而促使增生造山带中的大陆壳成熟。

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来源
《Journal of Asian earth sciences》 |2019年第15期|103978.1-103978.20|共20页
作者
Lin Zhengfan; Yuan Chao; Zhang Yunying; Sun Min; Long Xiaoping; Wang Xinyu; Huang Zongying; Chen Zhiwei;
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作者单位

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Guangdong Peoples R China|Univ Chinese Acad Sci Beijing 10069 Peoples R China|Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Guangdong Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Guangdong Peoples R China|Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

Univ Hong Kong Dept Earth Sci Pokfulam Rd Hong Kong Peoples R China;

Northwest Univ Dept Geol State Key Lab Continental Dynam Northern Thad St 229 Xian 710069 Shaanxi Peoples R China;

Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Guangdong Peoples R China|Univ Chinese Acad Sci Beijing 10069 Peoples R China;

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正文语种 eng
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关键词
Chinese Altai; Post-collision; Intraplate; High-silica granitoids;

机译：中国阿尔泰碰撞后;板内高硅质花岗岩;

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Petrogenesis and geodynamic implications of two episodes of Permian and Triassic high-silica granitoids in the Chinese Altai, Central Asian Orogenic Belt

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