An Early Permian (ca. 280 Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?
An Early Permian (ca. 280 Ma) silicic igneous province in the Alxa Block, NW China: A magmatic flare-up triggered by a mantle-plume?
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中国西北部阿拉善地块的早二叠世（约280 Ma）硅质火成岩省：由地幔柱引发的岩浆爆发？
DOI：
10.1016/j.lithos.2014.01.018
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发表时间：
2014-09
期刊：
影响因子：
3.5
通讯作者：
Yu Liu
中科院分区：
文献类型：
--
作者：
Xian-Hua Li;Qiang Wang;Gong-Jian Tang;Yu Liu
硅质火成岩省对地球动力学过程具有重要意义。在这项研究中，我们发现阿拉善地块中主要的早二叠世（约 280 Ma）花岗岩类对应于中国西北地区分布的一个重要的硅质火成岩省。我们提供了巴颜诺尔贡岩基中新发现的I型和A型花岗岩和高Sr/Y花岗闪长岩以及阿拉善地块毕吉尔台杂岩中的辉长岩、闪长岩和石英闪长岩的锆石U-Pb年龄和Hf-O同位素，以及全岩地球化学和Sr-Nd同位素数据。巴颜诺尔功基岩中的I型二长花岗岩、花岗闪长岩和A型花岗岩可能分别是由壳幔岩浆混合、加厚的榴辉岩下地壳和底板幔源镁铁质岩石的部分熔融而生成的。毕吉尔台杂岩中的辉长岩、石英闪长岩和闪长岩可能分别由岩石圈地幔部分熔融、玄武质岩浆分异和中地壳部分熔融生成。尽管这些岩石具有明显的地球化学和同位素异质性，但新的 SIMS 和 LA-ICP-MS U-Pb 锆石测年表明，它们是在大约 1000 年的非常短的时间间隔内形成的。 280马。因此，地幔、下地壳和中地壳在此时经历了广泛的熔融。鉴于这些岩浆岩没有空间或时间分带，并且可能是在拉张环境中形成的，我们建议大约。 280 中国西北部的马塔里木地幔柱可能引发了阿拉善硅质火成岩省的岩浆爆发。
Silicic igneous provinces have important implications for geodynamic processes. In this study, we show that the predominantly Early Permian (ca. 280 Ma) granitoids in the Alxa Block correspond to an important silicic igneous province with areal distribution in Northwest (NW) China. We present zircon U–Pb age and Hf–O isotopic, and whole-rock geochemical and Sr–Nd isotopic data for the newly identified I- and A-type granites and high Sr/Y granodiorites in the Bayannuoergong batholith, and gabbros, diorites and quartz diorites in the Bijiertai Complex, Alxa Block. The I-type monzogranites, granodiorites and A-type granites of the Bayannuoergong batholith were probably generated by mixing between crust- and mantle-derived magmas, partial melting of a thickened eclogitic lower crust and underplated mantle-derived mafic rocks, respectively. The gabbros, quartz diorites and diorites of the Bijiertai Complex were likely generated by partial melting of the lithospheric mantle, differentiation from basaltic magmas and partial melting of the middle crust, respectively. Despite pronounced geochemical and isotopic heterogeneity of these rocks, new SIMS and LA–ICP-MS U–Pb zircon dating indicates that they were formed over a very short time interval at ca. 280 Ma. Thus, the mantle, lower crust and middle crust underwent widespread melting at this time. Given that these magmatic rocks have no spatial or temporal zonation, and were probably formed in an extensional setting, we suggest that the ca. 280 Ma Tarim mantle plume in NW China may have triggered the magmatic flare-up of the Alxa silicic igneous province.
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影响因子：
3.5
作者：
Lin Ma;Qiang Wang;Zheng‐Xiang Li;D. Wyman;Zi-qi Jiang;Jin-Hui Yang;Guo-Ning Gou;H. Guo
通讯作者：
Lin Ma;Qiang Wang;Zheng‐Xiang Li;D. Wyman;Zi-qi Jiang;Jin-Hui Yang;Guo-Ning Gou;H. Guo
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影响因子：
3.5
作者：
通讯作者：
--
DOI：
10.1007/s11430-012-4435-y
发表时间：
2012
期刊：
Science China Earth Sciences
影响因子：
--
作者：
Wen Zhang;Tairan Wu;Jicheng Feng;Rongguo Zheng;Yuankai He
通讯作者：
Wen Zhang;Tairan Wu;Jicheng Feng;Rongguo Zheng;Yuankai He
影响因子：
3.4
作者：
M. Pankhurst;B. Schaefer;P. Betts;N. Phillips;M. Hand
通讯作者：
M. Pankhurst;B. Schaefer;P. Betts;N. Phillips;M. Hand
根据S接收函数和SKS分裂测量推断青藏高原东北部岩石圈厚度和上地幔变形
影响因子：
2.8
作者：
Zhang, Hongshuang1, 2;Teng, Jiwen2;Tian, Xiaobo2;Zhang, Zhongjie2;Gao, Rui1;Liu, Jiaqi2
通讯作者：
Liu, Jiaqi2