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Local Rapid Exhumation and Fast Cooling in a Long-lived Paleoproterozoic Orogeny

文献类型：期刊论文

作者Zou, Yi1,3,4; Chu, Xu3; Li, Qiuli1,4; Mitchell, Ross N.4; Zhai, Mingguo2,4; Zou, Xinyu1; Zhao, Lei4; Wang, Yuquan1,4; Liu, Bo1,4
刊名JOURNAL OF PETROLOGY
出版日期2020-10-01
卷号61期号:10页码:32
关键词Jiao-Liao-Ji orogen fast metamorphism garnet diffusion modeling geochronology plate tectonics
ISSN号0022-3530
DOI10.1093/petrology/egaa091
英文摘要The exhumation and cooling rates of high-grade metamorphic rocks are crucial for inferring orogenic processes and understanding the regimes of heat transport in the Earth's crust. Quantification of these rates remains challenging for Precambrian terranes, because the temporal resolution of geochronology becomes coarser in deeper geological time. This limitation is partly reflected by a striking lack of Proterozoic or older short-duration events (<10 Myr); most documented cases of fast metamorphism are confined to the Phanerozoic. In this study, we use garnet geospeedometry to explore the metamorphic rates of Paleoproterozoic high-grade rocks from two representative areas within the long-lived (1.95-1.80 Ga) Jiao-Liao-Ji orogenic belt, North China Craton. The pelitic granulites in the Taipingzhuang area record high-pressure granulite-facies (HPG) metamorphism of similar to 12 kbar and similar to 800 degrees C, followed by a fast decompression-cooling to similar to 5 kbar and similar to 600 degrees C within similar to 5 Myr, at c. 1.87 Ga. The pelitic granulites in the Rizhuang area document a brief (<1 Myr) thermal excursion to ultrahigh-temperature (UHT) metamorphism of similar to 8 kbar and similar to 940 degrees C at c. 1.85 Ga, followed by a fast cooling to similar to 600 degrees C within 1-5 Myr. In light of available geological data, the fast decompression-cooling of HPG granulites is interpreted as the syncollisional exhumation of thickened lower crustal segments at c. 1.87 Ga, most probably through tectonic extrusion. The thermal excursion transiently reaching UHT conditions is inferred to be triggered by localized syn-metamorphic mafic intrusions in association with magmatic underplating during post-collisional extension at c. 1.85 Ga. These metamorphic pulses were interspersed within the protracted Paleoproterozoic orogenesis and require geodynamic processes resembling modern plate tectonics. Notably, these ancient rapid events are beyond the temporal resolution of commonly used in situ geochronology, which tends to yield apparent longer durations given errors and uncertainties. We therefore note that most ancient metamorphic rates might be underestimated using geochronological data, and recommend garnet geospeedometry as a promising alternative approach. The largely similar rates recorded by Paleoproterozoic and Phanerozoic orogens, as well as high-pressure metamorphism at 1.9-1.8 Ga, support the operation of modern plate tectonics in Paleoproterozoic time.
资助项目National Natural Science Foundation of China[41530208] ; National Natural Science Foundation of China[41890834] ; Chinese Academy of Sciences[XDB41000000] ; Postdoctoral Science Foundation of China[BX20190328] ; National Sciences and Engineering Research Council of Canada[RGPIN-201803925] ; University of Toronto
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000634895400003
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Toronto ; University of Toronto ; University of Toronto ; University of Toronto ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Toronto ; University of Toronto ; University of Toronto ; University of Toronto ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Toronto ; University of Toronto ; University of Toronto ; University of Toronto ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; National Sciences and Engineering Research Council of Canada ; University of Toronto ; University of Toronto ; University of Toronto ; University of Toronto
源URL[http://ir.iggcas.ac.cn/handle/132A11/101083]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Zou, Yi
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing, Peoples R China
3.Univ Toronto, Dept Earth Sci, Toronto, ON M5S 3B1, Canada
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zou, Yi,Chu, Xu,Li, Qiuli,et al. Local Rapid Exhumation and Fast Cooling in a Long-lived Paleoproterozoic Orogeny[J]. JOURNAL OF PETROLOGY,2020,61(10):32.
APA Zou, Yi.,Chu, Xu.,Li, Qiuli.,Mitchell, Ross N..,Zhai, Mingguo.,...&Liu, Bo.(2020).Local Rapid Exhumation and Fast Cooling in a Long-lived Paleoproterozoic Orogeny.JOURNAL OF PETROLOGY,61(10),32.
MLA Zou, Yi,et al."Local Rapid Exhumation and Fast Cooling in a Long-lived Paleoproterozoic Orogeny".JOURNAL OF PETROLOGY 61.10(2020):32.

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来源：地质与地球物理研究所

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