Petrogenesis of the Late Triassic Biluoxueshan granitic pluton, SW China: Implications for the tectonic evolution of the Paleo-Tethys Sanjiang Orogen

Chen Qi; Wang Changming; Bagas Leon; Du Bin; Shi Kangxing; Yang Lifei; Zhu Jiaxuan; Duan Hongyu

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Petrogenesis of the Late Triassic Biluoxueshan granitic pluton, SW China: Implications for the tectonic evolution of the Paleo-Tethys Sanjiang Orogen

机译：晚期三叠系Biluoxueshan花岗岩Pluton，SW中国的培养内容：对Paleo-Thethys Sanjiang Orogen的构造演化的影响

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The Sanjiang Orogen is important for us to better understand the tectonic evolution of the Paleo-Tethys Ocean. However, the petrogenesis and tectonic setting of the Late Triassic igneous rocks in the central part of the orogen are poorly understood. In this study, we present new whole-rock elemental and isotopic compositions for the Biluoxueshan Pluton, which consists of quartz diorite, granodiorite, and alkali-feldspar granite. Zircon U-Pb dating yields crystallisation ages of 231 ? 1 Ma for the quartz diorite, 227 ? 1 Ma for the granodiorite, and 227 ? 2, 224 ? 2, 222 ? 1, and 217 ? 3 Ma for alkali-feldspar granites, indicating a prolonged emplacement of the pluton. Quartz diorites are metaluminous, high-potassium calc-alkaline, and magnesian in composition. Granodiorites are characterized by peraluminous composition and the existence of normative-corundum, resembling S-type granite. They have negative zircon ?Hf(t) values (-13 to -10.8) and old Hf crustal model ages (2060?1920 Ma), indicating a Paleoproterozoic crustal source. Alkali-feldspar granites are metaluminous to weakly peraluminous, have higher SiO2 content, FeOT/MgO ratio and differentiation index (DI) than other samples, and pronouncedly negative Eu anomalies, which are characteristics of highly fractionated granites. They have narrow ?Hf(t) values of -2.7 to +2.6 with corresponding Hf crustal model ages of 1410?1060 Ma, indicating a Mesoproterozoic juvenile crustal source modified by mantle-derived magma. By combining previous and the new data, we proposed a new tectonic evolution model of a Late Triassic northward scissor-like postcollisional extension during ca. 235?223 Ma in the Changning-Menglian Suture Zone.

机译：三江orogen对我们来说很重要，以便更好地了解古特提斯海洋的构造演变。然而，奥根根中枢神经部分的晚期三叠座发火岩的纤维化和构造设置差不多。在这项研究中，我们为Biluoxueshan芦苇提出了新的全岩体元素和同位素组合物，其由石英二矾石，Granodiorite和碱金刚石花岗岩组成。锆石U-PB约会产生231岁的结晶岁？石英Diorite 1 ma为227？ 1 ma为graneodiorite和227？ 2,224？ 2,222？ 1和217？ 3 mA对于碱金属花岗岩，表明芦苇的长时间施加。石英Diorites是金属滤光剂，高钾钙碱和组成中的氧化镁。 Granodiorites的特征在于灭菌组合物和规范 - 刚玉的存在，类似于S型花岗岩。它们具有负锆石？HF（t）值（-13至-10.8）和旧的HF地壳模型年龄（2060？1920 mA），表明古普罗古奇地壳源。碱金属花岗岩是弱损失的金属滤光，具有更高的SiO 2含量，感光/ MgO比和分化指数（DI），而且分解的负面的欧盟异常，这是高度分馏花岗岩的特性。它们具有-2.7至+2.6的窄？HF（t）值，具有相应的HF地壳模型为1410岁，1410岁，表明由地幔衍生的岩浆改性的中型古代少年地壳源。通过组合以前和新数据，我们提出了一种新的三叠系北方剪刀状后矫形器的新构造演进模型。 235？在长宁蒙连缝合区223马。

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来源
《Journal of Asian earth sciences》 |2021年第15期|104700.1-104700.22|共22页
作者
Chen Qi; Wang Changming; Bagas Leon; Du Bin; Shi Kangxing; Yang Lifei; Zhu Jiaxuan; Duan Hongyu;
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作者单位

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

Univ Western Australia Ctr Explorat Targeting Crawley WA 6009 Australia|China Geol Survey Xian Ctr Mineral Resources Survey Xian 710054 Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China|China Nonferrous Met Resource Geol Survey Beijing 100012 Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

East China Univ Technol Sch Earth Sci Nanchang 330013 Jiangxi Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

China Univ Geosci State Key Lab Geol Proc & Mineral Resources Beijing 100083 Peoples R China;

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正文语种 eng
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关键词
Geochronology; Petrogenesis; Biluoxueshan Pluton; Paleo-Tethyan evolution; Sanjiang Orogen;

机译：地理学;培养物;Biluoxueshan冥王星;古茶岩进化;三江orenogen;

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Petrogenesis of the Late Triassic Biluoxueshan granitic pluton, SW China: Implications for the tectonic evolution of the Paleo-Tethys Sanjiang Orogen

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