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  4. 岩石圈演化国家重点实验室
Older orogens cooled slower: new constraints on Orosirian tectonics from garnet diffusion modeling of metamorphic timescales, Jiaobei terrain, North China Craton

文献类型：期刊论文

作者Zou, Yi2,3; Li, Qiuli2,3; Chu, Xu1; Zhai, Mingguo3,5; Mitchell, Ross N.3,4; Zhao, Lei3; Zhou, Ligang3; Wang, Yuquan3; Liu, Bo3
刊名CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
出版日期2021-11-01
卷号176期号:11页码:24
关键词Metamorphic timescale Diffusion modeling Pelitic granulites Jiaobei terrane Plate tectonics Orogenesis
ISSN号0010-7999
DOI10.1007/s00410-021-01846-w
英文摘要Metamorphic timescales harbor crucial information for quantifying lithospheric processes and identifying tectonic regimes. The Orosirian Period is known for global orogenesis during 2.1-1.8 Ga that possibly signifies the emergence of global-scale plate tectonics. While the metamorphic pressure-temperature (P-T) paths and T/P ratios have been extensively used to characterize 2.1-1.8 Ga orogens, their detailed metamorphic timescales remain underutilized. In this study, we use garnet diffusion modeling to explicitly explore the metamorphic timescales of dominant pelitic granulites in the Jiaobei terrane, the southwest part of the Jiao-Liao-Ji orogenic belt (JLJB), North China Craton. The pelitic granulites record high-pressure granulite-facies metamorphism of 13-14 kbar and 860-870 degrees C, followed by fast decompression (4-21 mm yr(-1)) with some degree of heating to medium-pressure granulite-facies retrogression of 7-8 kbar and 865-950 degrees C at c. 1.85 Ga. The subsequent cooling is nearly isobaric, but likely nonlinear with initially faster and later slower cooling (17-32 degrees C Myr(-1), 950/865-700 degrees C; 5-7 degrees C Myr(-1), 700-600 degrees C, respectively). The determined clockwise P-T-t path provides evidence for convergent plate boundary processes and the fast exhumation is likely related to an extensional setting. The relatively fast exhumation and cooling rates at high temperatures, as obtained via diffusion chronometry, represent the fastest rates yet reported from 2.1 to 1.8 Ga orogens and are several times to one order of magnitude slower than those observed in modern orogens. In the light of recent numerical modeling, we suggest that these slower metamorphic rates of the c. 2.1-1.8 Ga JLJB orogenic rocks are consistent with the features of orogenesis occurring at higher mantle temperatures, such as hotter orogenic thermal structures, less over-thickened orogenic crusts, and distributed strain patterns. Therefore, the timescale information from the JLJB indicates that Paleoproterozoic plate tectonics under higher temperatures might have caused subduction and collisional orogenesis to be distinct from their modern style. Notably, the detailed ancient metamorphic timescales achieved by diffusion modeling cannot be resolved geochronologically, highlighting the necessity of applying diffusion chronometry to quantify ancient tectonic processes.
WOS关键词LIAO-JI BELT ; PRESSURE PELITIC GRANULITES ; P-T PATH ; MINERAL EQUILIBRIA CALCULATIONS ; U-PB ; PHASE-EQUILIBRIA ; HIGH-TEMPERATURE ; PLATE-TECTONICS ; HOT OROGENS ; HT-UHT
资助项目National Natural Science Foundation of China[41890830] ; National Natural Science Foundation of China[42002211] ; National Natural Science Foundation of China[41773044] ; National Key Research and Development Program of China[2016YFE0203000] ; Postdoctoral Science Foundation of China[BX20190328]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000707581500001
出版者SPRINGER
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 ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China ; Postdoctoral Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/102982]  
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; Li, Qiuli
作者单位1.Univ Toronto, Dept Earth Sci, Toronto, ON, Canada
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100059, Peoples R China
5.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zou, Yi,Li, Qiuli,Chu, Xu,et al. Older orogens cooled slower: new constraints on Orosirian tectonics from garnet diffusion modeling of metamorphic timescales, Jiaobei terrain, North China Craton[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2021,176(11):24.
APA Zou, Yi.,Li, Qiuli.,Chu, Xu.,Zhai, Mingguo.,Mitchell, Ross N..,...&Liu, Bo.(2021).Older orogens cooled slower: new constraints on Orosirian tectonics from garnet diffusion modeling of metamorphic timescales, Jiaobei terrain, North China Craton.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,176(11),24.
MLA Zou, Yi,et al."Older orogens cooled slower: new constraints on Orosirian tectonics from garnet diffusion modeling of metamorphic timescales, Jiaobei terrain, North China Craton".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 176.11(2021):24.

入库方式： OAI收割

来源：地质与地球物理研究所

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