Switching from advancing to retreating subduction in the Neoproterozoic Tarim Craton, NW China: Implications for Rodinia breakup

Guanghui Wu; Shuai Yang; Wei Liu; R.Damian Nance; Xin Chen; Zecheng Wang; Yang Xiao

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Switching from advancing to retreating subduction in the Neoproterozoic Tarim Craton, NW China: Implications for Rodinia breakup

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Geodynamic drivers for the supercontinent cycle are generally attributed to either top-down(subduction-related)or bottom-up(mantle-related)processes.Compiled geochemical data and U-Pb ages and Hf isotopic signatures for magmatic and detrital zircons from the Tarim Craton reveal a distinct change in subduction style during the Neoproterozoic.The subduction cycle is recorded in increasing and decreasing intensity of subduction-related magmatic rocks and time-equivalent sedimentary successions,and converse trends ofεHf(t)values and corresponding changes in crustal incubation time.These trends are consistent with a switch from advancing to retreating subduction.The switch likely occurred at ca.760 Ma when zirconεHf(t)values increase and crustal incubation times decrease following a transitional shift between 800 Ma and 760 Ma.A switch at this time is consistent with Rodinia breakup and may have resulted in the late Neoproterozoic Tarim rift basin.The long-lived(ca.500 Ma)subduction recorded in the Tarim Craton suggests the predominance of a top-down process for Rodinia breakup on this part of its margin.

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《地学前缘：英文版》 |2021年第1期|161-171|共11页
作者
Guanghui Wu; Shuai Yang; Wei Liu; R.Damian Nance; Xin Chen; Zecheng Wang; Yang Xiao;
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作者单位

School of Geoscience and Technology;

Southwest Petroleum University;

Chengdu 610500;

China;

Southwest Petroleum University;

Division of Key Laboratory of Carbonate Reservoirs;

CNPC;

Chengdu 610500;

China;

PetroChina Research Institute of Petroleum Exploration&Development;

Beijing 100083;

China;

Department of Geological Sciences;

316 Clippinger Laboratories;

Ohio University;

Athens;

OH 45701;

USA;

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原文格式 PDF
正文语种 chi
中图分类地球化学;
关键词
Supercontinent breakup; Top-down tectonics; Rodinia; Subduction; U-Pb-Hf isotopes;

Switching from advancing to retreating subduction in the Neoproterozoic Tarim Craton, NW China: Implications for Rodinia breakup

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