Late Permian–Triassic tectonic nature of the eastern Central Asian Orogenic Belt: Constraints from the geochronology and geochemistry of igneous rocks in the Bureya Massif
Late Permian–Triassic tectonic nature of the eastern Central Asian Orogenic Belt: Constraints from the geochronology and geochemistry of igneous rocks in the Bureya Massif
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中亚造山带东部晚二叠世—三叠世构造性质：布列亚地块火成岩年代学和地球化学的制约
DOI：
10.1016/j.lithos.2020.105924
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发表时间：
2021
期刊：
影响因子：
3.5
通讯作者：
Roman O. Ovchinnikov
中科院分区：
文献类型：
--
作者：
Xin-Yu Long;Wen-Liang Xu;Hao Yang;Jie Tang;Andrey A. Sorokin;Roman O. Ovchinnikov
中亚造山带（CAOB）东部晚古生代-早中生代的构造性质一直存在争议，而Bureya地块晚古生代-早中生代的岩浆活动为解决这一问题提供了机会。本文报道了Bureya地块南部晚古生代-早中生代火成岩的锆石U-Pb年龄、Hf同位素和全岩常量、微量元素数据。这些数据提供了深入了解火成岩的岩石成因，并制约晚古生代-早中生代的构造性质的CAOB东部。锆石U-Pb年龄显示晚二叠世（约1000 ~ 10000年）为晚二叠世。255 Ma）和中晚三叠世（ca. 216 Ma）岩浆事件。晚二叠世火成岩主要由石英二长闪长岩、片麻状二长花岗岩和A型片麻状正长花岗岩等双峰式岩石组合组成。中-晚三叠世火成岩以斑状正长花岗岩为主，并有A型花斑岩、正长花岗岩和片麻状大斑状石英正长岩。石英二长闪长岩具有低SiO2含量（53.9- 56.1wt%）、高Mg#（56-57）和Cr（160-175 ppm）、Co（25.2-27.8 ppm）和Ni（61.2-72.3 ppm）含量，并且富含轻稀土元素（LREE）和大离子亲石元素（LILE;例如，K、Rb、Sr和Ba）。这些特征，沿着富集的锆石Hf成分[εHf（t）=-8.31 ~-0.44]，表明它们的原始岩浆来源于岩石圈地幔的部分熔融，这些地幔被俯冲板片化石释放的流体交代。花岗岩类具有高SiO2、低MgO含量，富集LILE，亏损高场强元素（HFSE），εHf（t）值为−11.5 ~+2.87，两阶段模式年龄（TDM 2）为1968-1024 Ma。这些特征表明，它们来自部分熔融的古元古代-中元古代增生的地壳材料，然而，这些花岗岩类具有独特的，异质的地球化学成分，排除了简单的分离结晶的一个单一的父熔体，并强烈地表明，他们起源于不同的成岩过程。晚二叠世-三叠纪双峰式岩浆岩套和A型花岗岩的出现，反映了本区的伸展环境。
The late Paleozoic–early Mesozoic tectonic nature of the eastern Central Asian Orogenic Belt (CAOB) has been subject to debate, and the late Paleozoic–early Mesozoic magmatism in the Bureya Massif provides an opportunity to address this issue. We report new zircon Usingle bondPb ages, Hf isotope data, and whole-rock major and trace element data for late Paleozoic–early Mesozoic igneous rocks from the south of the Bureya Massif. These data provide insight into the petrogenesis of the igneous rocks, and constrain the late Paleozoic–early Mesozoic tectonic nature of the eastern CAOB. Zircon Usingle bondPb ages indicate that the late Permian (ca. 255 Ma) and Middle–Late Triassic (ca. 216 Ma) magmatic events are identified in the south of the Bureya Massif. The late Permian igneous rocks consist mainly of bimodal rock suites, which include quartz monzodiorites, gneissic monzogranites, and A-type gneissic syenogranites. The Middle–Late Triassic igneous rocks are dominated by porphyritic syenogranites, and A-type granite porphyries, syenogranites, and gneissic macroporphyritic quartz syenites. The quartz monzodiorites have low SiO2contents (53.9–56.1 wt%), high Mg# (56–57), and Cr (160–175 ppm), Co (25.2–27.8 ppm), and Ni (61.2–72.3 ppm) contents, and are enriched in light rare earth elements (LREE) and large-ion lithophile elements (LILE; e.g., K, Rb, Sr, and Ba). These characteristics, along with enriched zircon Hf compositions [εHf(t) = −8.31 to −0.44], suggest that their primary magma was derived from the partial melting of lithospheric mantle that had been metasomatized by fluids released from a fossil subducted slab. The granitoids have high SiO2, and low MgO contents, and are enriched in LILE, depleted in high field strength elements (HFSE), and yield εHf(t) values of −11.5 to +2.87 and two-stage model ages (TDM2) ages of 1968–1024 Ma. These characteristics suggest that they were derived from the partial melting of Paleoproterozoic–Mesoproterozoic accreted crustal material; however, these granitoids have distinct, heterogeneous geochemical compositions, precluding simple fractional crystallization of a single parental melt, and strongly suggesting that they were originated from distinct petrogenetic processes. The late Permian–Triassic bimodal igneous rock suites and A-type granites imply an extensional environment in the eastern CAOB.
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