The Deep Lithospheric Structure of the Junggar Terrane, NW China: Implications for Its Origin and Tectonic Evolution
The Deep Lithospheric Structure of the Junggar Terrane, NW China: Implications for Its Origin and Tectonic Evolution
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中国西北准噶尔地体深部岩石圈结构：其起源和构造演化的意义
DOI：
10.1029/2019jb018302
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发表时间：
2019-11
影响因子：
3.9
通讯作者：
Yang Bo
中科院分区：
文献类型：
--
作者：
Zhang Anqi;Afonso Juan Carlos;Xu Yixian;Wu Shucheng;Yang Yingjie;Yang Bo
中亚造山带是世界上最大、最古老的增生造山带之一。准噶尔地体位于中北奥陶系西南部，是研究整个中北奥陶系演化的关键构造单元。然而，由于缺乏捕虏体和有限的地球物理数据与地幔深度的敏感性，其基底的性质和深部岩石圈结构仍然存在很大的争议。在这里，我们使用概率反演方法来联合反演新处理的瑞利波频散数据，地表热流，大地水准面异常，和绝对高程。输出是准格尔地体西部下方整个岩石圈的地震、温度、体积密度和成分结构的三维模型。我们的研究结果揭示了准噶尔盆地西翼下的俯冲型地幔异常，其结构与化石俯冲带非常相似。我们还证实了存在一个厚的下地壳下盆地的属性类似于玄武岩。在此基础上，进一步进行了假设检验，证明了准噶尔盆地基底成因的“大洋模式”比其他模式更能解释现有的地球物理和地球化学信息。基于所有这些观察，我们提出了一个西准噶尔地体的演化模型，调和了一些以前相互矛盾的解释。
The Central Asian Orogenic Belt (CAOB) is one of the world's largest and oldest accretionary orogens. The Junggar Terrane, located in the southwestern CAOB, is considered a key tectonic element to understand the evolution of the whole CAOB. However, given the lack of xenoliths and limited geophysical data with sensitivities to mantle depths, the nature of its basement and its deep lithospheric structure are still highly debated. Here we use a probabilistic inverse method to jointly invert newly processed Rayleigh wave dispersion data, surface heat flow, geoid anomalies, and absolute elevation. The output is a 3‐D model of the seismic, temperature, bulk density, and compositional structure of the whole lithosphere beneath the western part of the Junggar Terrane. Our results reveal a subduction‐shaped mantle anomaly beneath the western flank of the Junggar Basin that resembles closely the structure of a fossil subduction zone. We also confirm the presence of a thick lower crust beneath the basin with properties similar to those of basaltic rocks. On account of these results, we further conduct a hypothesis test and demonstrate that an “oceanic model” for the origin of the basement of the Junggar Basin explains the available geophysical and geochemical information better than other alternative models. Based on all these observations, we propose an evolutionary model for the western Junggar Terrane that reconciles a number of previously conflicting interpretations.
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DOI：
10.1146/annurev-earth-060614-105254
发表时间：
2015-06
影响因子：
14.9
作者：
W. Xiao;B. Windley;S. Sun;Jiliang Li;Baochun Huang;Chunming Han;C. Yuan;Minjia Sun;Hanlin Chen-Hanli
通讯作者：
W. Xiao;B. Windley;S. Sun;Jiliang Li;Baochun Huang;Chunming Han;C. Yuan;Minjia Sun;Hanlin Chen-Hanli
影响因子：
18.3
作者：
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通讯作者：
H. Avendonk;Joshua K. Davis;Jennifer L. Harding;L. Lawver
影响因子：
3.5
作者：
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通讯作者：
G. Tang;Qiang Wang;D. Wyman;Zheng‐Xiang Li;Yigang Xu;Zhenhua Zhao
影响因子：
4.9
作者：
P. Lonsdale;J. Hawkins
通讯作者：
P. Lonsdale;J. Hawkins
影响因子：
3.5
作者：
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通讯作者：
R. Gao;Long Xiao;F. Pirajno;Guocan Wang;Xin He;Gang Yang;Shenghao Yan