Neoproterozoic to Paleozoic long‐lived accretionary orogeny in the northern Tarim Craton
Neoproterozoic to Paleozoic long‐lived accretionary orogeny in the northern Tarim Craton
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DOI：
10.1002/2013tc003501
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发表时间：
2014-03
期刊：
影响因子：
4.2
通讯作者：
Rongfeng Ge;Wenbin Zhu;S. Wilde;Jingwen He;X. Cui;Xi Wang;Zheng Bi-hai
中科院分区：
文献类型：
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作者：
Rongfeng Ge;Wenbin Zhu;S. Wilde;Jingwen He;X. Cui;Xi Wang;Zheng Bi-hai
位于亚洲中部的塔里木盆地参与了新元古代Rodinia超大陆的组装和裂解以及古生代中亚造山带的俯冲-增生。然而，在这些事件的构造演化是有争议的，和新元古代和古生代构造过程之间的联系是失踪。本文对塔里木东北部库鲁克塔格西部地区广泛分布的花岗岩类进行了锆石U-Pb年龄、Hf同位素和全岩地球化学研究。三个明显的花岗岩类岩浆活动时期：大约830-820 Ma，660-630 Ma和420-400 Ma。岩浆来源，熔融条件（压力，温度和水的可用性），和构造环境的各种花岗岩类从每个时期的确定。根据我们的研究结果和邻近地区的地质、年代学、地球化学和同位素数据，提出了一个长寿命增生造山模型。该模式包括从天山到北方塔里木向南推进的早期增生（约950-780 Ma）和向北后退的晚期增生（约780-600 Ma），随后是弧后张开和随后的双向俯冲（约460-400 Ma）的复合弧后盆地（即，南天山海洋）。我们的模型强调了西南CAOB的长期增生历史，这可能是作为Circum-Rodinia俯冲带的一部分开始的，并且与西伯利亚板块南缘发生的事件相当，从而挑战了CAOB传统的向南迁移增生模型。
The Tarim Craton, located in the center of Asia, was involved in the assembly and breakup of the Rodinia supercontinent during the Neoproterozoic and the subduction‐accretion of the Central Asian Orogenic Belt (CAOB) during the Paleozoic. However, its tectonic evolution during these events is controversial, and a link between the Neoproterozoic and Paleozoic tectonic processes is missing. Here we present zircon U‐Pb ages, Hf isotopes, and whole‐rock geochemical data for the extensive granitoids in the western Kuruktag area, northeastern Tarim Craton. Three distinct periods of granitoid magmatism are evident: circa 830–820 Ma, 660–630 Ma, and 420–400 Ma. The magma sources, melting conditions (pressure, temperature, and water availability), and tectonic settings of various granitoids from each period are determined. Based on our results and the geological, geochronological, geochemical, and isotopic data from adjacent areas, a long‐lived accretionary orogenic model is proposed. This model involves an early phase (circa 950–780 Ma) of southward advancing accretion from the Tianshan to northern Tarim and a late phase (circa 780–600 Ma) of northward retreating accretion, followed by back‐arc opening and subsequent bidirectional subduction (circa 460–400 Ma) of a composite back‐arc basin (i.e., the South Tianshan Ocean). Our model highlights a long‐lived accretionary history of the southwestern CAOB, which may have initiated as part of the circum‐Rodinia subduction zone and was comparable with events occurring at the southern margin of the Siberian Craton, thus challenging the traditional southward migrating accretionary models for the CAOB.