Tectono-metamorphic evolution of paragneiss in the Chengde metamorphic Complex, northern Paleoproterozoic Trans-North China Orogen

被引:1
|
作者
Zhang, Hui C. G. [1 ,2 ]
Zhao, Guochun [2 ,3 ]
Wang, Chao [2 ]
Xu, Nanqing [2 ]
Yao, Jinlong [3 ]
Wang, Juan [4 ]
机构
[1] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, POB 4588, Beijing 100049, Peoples R China
[2] Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Peoples R China
[3] Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Northern Taibai St 229, Xian 710069, Peoples R China
[4] Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China
关键词
Chengde Metamorphic Complex; The Trans-North China Orogen; Paragneiss; P-T conditions; Subduction channel; HIGH-PRESSURE GRANULITES; HIGH-GRADE METAMORPHISM; TEMPERATURE-TIME PATHS; U-PB ISOTOPE; RETROGRADED ECLOGITES; HEBEI PROVINCE; CRATON; ZIRCON; GARNET; ROCKS;
D O I
10.1016/j.precamres.2024.107381
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Metasedimentary rocks can provide important information for reconstructing tectonic evolution of an orogen. In this study, we report the newly identified metapelite and metagraywacke samples from the Chengde Metamorphic Complex, the Trans -North China Orogen in the North China Craton. The garnet -bearing paragneiss generally occurs as country rocks of mafic granulite and amphibolite, and displays compositional layering with distinct gneissosity. The metapelite mainly consists of garnet, sillimanite, biotite, muscovite, plagioclase, and quartz, while the metagraywacke commonly comprises garnet, plagioclase, K -feldspar, quartz, and biotite/ chlorite. Application of conventional geothermobarometers and phase equilibrium modelling constrains diverse peak metamorphic pressure-temperature (P -T) conditions (CD35, -800 degrees C/10.5 kbar determined by phase equilibrium modelling; CD37, 677-716 degrees C/9.6-9.8 kbar determined by geothermobarometers; CD45, 665-691 degrees C/9.1-9.6 kbar and - 745 degrees C/11.2 kbar determined by geothermobarometers and phase equilibrium modelling respectively). The metapelite sample CD35 also records two retrograde stages, defining a clockwise PT path with isothermal decompression (ITD) process. U-Pb dating of zircon and monazite yields metamorphic ages of 1910-1796 Ma, implying the timing of subduction to the lower crust. Combining previous studies in the Chengde Metamorphic Complex, we conclude that this complex is composed of imbricate rocks with different peak metamorphic P -T conditions, metamorphic grades, metamorphic ages, protolith origins, or protolith ages, indicating that these rocks were subducted to different depths in the subduction channel and then exhumed together to shallower crustal levels.
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页数:16
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