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Metamorphic P-T-t paths of pelitic granulites of the Taihua metamorphic complex in the Mts. Huashan area and tectonothermal implications for the Palaeoproterozoic Trans-North China Orogen
Wang, Guo-Dong1,2; Wang, Hao Y. C.2; Chen, Hong-Xu2; Lu, Jun-Sheng3; Zhang, Bo4; Van Tho Pham2; Zhang, Ji-Jun5; Zhang, Qing6; Wu, Chun-Ming2
2017-03-01
发表期刊PRECAMBRIAN RESEARCH
卷号290页码:147-162
文章类型Article
摘要Metamorphic evolution and geochronology of pelitic granulites were reported for the first time in the Taihua metamorphic complex, Mts. Huashan area, southern segment of the trans-North China Orogen (TNCO). Three generations of metamorphic mineral assemblages are recognized: (1) the prograde metamorphic mineral assemblages (M-1) are represented by mineral inclusions within the garnet porphyroblasts; (2) the metamorphic peak assemblage (M-2) are the garnet porphyroblasts and minerals in the matrix (biotite + orthopyroxene + plagioclase + quartz + I(-feldspar + ilmenite + zircon + magnetite); and (3) the retrograde metamorphic mineral assemblages (M-3) are represented by the symplectic assemblages around the garnet porphyroblasts, resulted from decomposition reactions between garnet rims and neighboring minerals in the matrix. Calculated by both conventional thermobarometry and pseudo section modeling in the NCKFMASHT system using the Perple_X technique, the P-T conditions of these three metamorphic stages are constrained to be of 4-5 kbar/520-530 degrees C for the M1 stage, 6.88.6 kbar/730-810 degrees C for the M-2 stage and 4.1-6.4 kbar/570-740 degrees C for the M3 stage, respectively. The derived clockwise P-T paths imply that the Mts. Huashan terrane involved in the subduction and subsequent collision between the Eastern and Western Blocks of the North China Craton (NCC) along the Palaeoproterozoic Trans-North China Orogen (TNCO). High resolution SIMS U-Pb dating of metamorphic zircons reveals the metamorphic ages of 1.85-1.82 Ga. Combined with geochronological data from the literature, it is concluded that the tectonothermal evolution between the Eastern and Western Blocks started as early as similar to 1.97 Ga and lasted as late as 1.80 Ga. Furthermore, the eastern Taihua complex records older metamorphic ages and higher peak metamorphic pressures than those of the western Taihua complex, possibly suggesting an eastward subduction model for the TNCO. (C) 2016 Elsevier B.V. All rights reserved.
关键词Pelitic Granulites Taihua Metamorphic Complex Metamorphic P-t-t Path North China Craton
DOI10.1016/j.precamres.2016.12.008
收录类别SCI
语种英语
WOS记录号WOS:000394475100010
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136744
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, POB 4588, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.China Corp Coal Geol Engn, Beijing 100040, Peoples R China
5.Shaanxi Ctr Geol Survey, Xian 710068, Peoples R China
6.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
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Wang, Guo-Dong,Wang, Hao Y. C.,Chen, Hong-Xu,et al. Metamorphic P-T-t paths of pelitic granulites of the Taihua metamorphic complex in the Mts. Huashan area and tectonothermal implications for the Palaeoproterozoic Trans-North China Orogen[J]. PRECAMBRIAN RESEARCH,2017,290:147-162.
APA Wang, Guo-Dong.,Wang, Hao Y. C..,Chen, Hong-Xu.,Lu, Jun-Sheng.,Zhang, Bo.,...&Wu, Chun-Ming.(2017).Metamorphic P-T-t paths of pelitic granulites of the Taihua metamorphic complex in the Mts. Huashan area and tectonothermal implications for the Palaeoproterozoic Trans-North China Orogen.PRECAMBRIAN RESEARCH,290,147-162.
MLA Wang, Guo-Dong,et al."Metamorphic P-T-t paths of pelitic granulites of the Taihua metamorphic complex in the Mts. Huashan area and tectonothermal implications for the Palaeoproterozoic Trans-North China Orogen".PRECAMBRIAN RESEARCH 290(2017):147-162.
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