Diverse subduction and exhumation of tectono-metamorphic slices in the Kalatashitage area, western Paleozoic Dunhuang Orogenic Belt, northwestern China
文献类型：期刊论文
| 作者 | Zhang, Qian W. L.2; Wang, Hao Y. C.1,2; Liu, Jia-Hui2; Shi, Meng-Yan2,3; Chen, Yi-Chao2; Li, Zhen M. G.2; Wu, Chun-Ming2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 360页码:21 |
| 关键词 | Dunhuang orogenic belt Thermobaromerry and pseudosection modeling Zircon Subduction Collision Exhumation |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2020.105434 |
| 英文摘要 | High-pressure mafic granulite and garnet amphibolite are identified as small-scale tectonic slices within pelitic or semi-pelitic gneiss in the Kalatashitage area, which is located in the western Paleozoic Dunhuang Orogenic Belt, northwestern China. These rocks retain three generations of metamorphic mineral assemblages: prograde assemblage (M1) preserved as inclusions within garnet porphyroblasts, metamorphic peak assemblage (M2) consisting of matrix minerals and garnet porphyroblasts, and retrograde assemblage (M3) mainly represented by the symplectic minerals surrounding the embayed garnet and the retrograded hornblende rimming matrixtype clinopyroxene. Metamorphic pressure and temperature (P-T) paths of high-pressure mafic granulite, amphibolite, and metapelite retrieved by thermobarometry are all clockwise, passing from 640 to 720 degrees C/6.2-12.6 kbar (M1) through 840-920 C/14.6-16.2 kbar (M2) to 750-815 degrees C/5.5-7.9 kbar (M3) for high-pressure mafic granulite, from similar to 650 degrees C/5.7 kbar (M1) through -750 degrees C/9.2 kbar (M2) to -780 degrees C/8.1 kbar (M3) for amphibolite, and from similar to 615 degrees C/7.9 kbar (M1) through 730-820 degrees C/8.6-11.7 kbar (M2) to 675-740 degrees C/5.4-8.7 kbar (M3) for pelitic and semi-pelitic gneiss. Furthermore, pseudosection modeling of high-pressure mafic granulite indicates that the growth zonation of garnet porphyroblast exhibits pro grade metamorphism in a P-T range of 510-800 degrees C/8.5-13 kbar and demonstrates peak metamorphic P-T conditions of similar to 850 degrees C/16 kbar, which are consistent with the the rmobarometric estimates. The significant pressure differences in peak metamorphism observed in different rocks indicate that the rocks initially subducted to remarkably different depths and were subsequently juxtaposed at shallower crustal levels during exhumation. Sensitive high-resolution ion microprobe (SHRIMP) analysis and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U Pb dating of metamorphic zircon indicates that the metamorphic events occurred at ca. 430-420 Ma (M2) and ca. 400-390 Ma (M3), respectively. Metamorphism was followed by the intrusion of granitic dykes at ca. 244 Ma. Moreover, the metamorphic evolution indicates that the Kalatashitage area was involved in the subduction, collision and subsequent tectonic exhumation in the Paleozoic. Combined with previous literature, it is inferred that the discrepant subduction and exhumation of high-grade metamorphic rocks is a universal phenomenon in the Paleozoic Dunhuang Orogenic Belt, supporting the ubiquitous existence of subductioncollision complexes in this orogenic belt. (C) 2020 Elsevier B.V. All rights reserved. |
| WOS关键词 | ZIRCON U-PB ; HIGH-PRESSURE GRANULITES ; PALEOPROTEROZOIC CRUSTAL EVOLUTION ; HF ISOTOPIC CHARACTERISTICS ; NORTHEASTERN TARIM CRATON ; HIGH-GRADE METAMORPHISM ; TEMPERATURE TIME PATHS ; NW CHINA ; DIFFERENTIAL EXHUMATION ; REGIONAL METAMORPHISM |
| 资助项目 | National Natural Science Foundation of China[41730215] ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences[QYZDJ-SSW-DQC036] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000528205200004 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences ; Key Research Program of Frontier Sciences from Chinese Academy of Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/96227]  |
| 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 | Wu, Chun-Ming |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, POB 4588, Beijing 100049, Peoples R China 3.Henan Polytech Univ, Inst Resources & Environm, Jiaozuo 454000, Henan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Qian W. L.,Wang, Hao Y. C.,Liu, Jia-Hui,et al. Diverse subduction and exhumation of tectono-metamorphic slices in the Kalatashitage area, western Paleozoic Dunhuang Orogenic Belt, northwestern China[J]. LITHOS,2020,360:21. |
| APA | Zhang, Qian W. L..,Wang, Hao Y. C..,Liu, Jia-Hui.,Shi, Meng-Yan.,Chen, Yi-Chao.,...&Wu, Chun-Ming.(2020).Diverse subduction and exhumation of tectono-metamorphic slices in the Kalatashitage area, western Paleozoic Dunhuang Orogenic Belt, northwestern China.LITHOS,360,21. |
| MLA | Zhang, Qian W. L.,et al."Diverse subduction and exhumation of tectono-metamorphic slices in the Kalatashitage area, western Paleozoic Dunhuang Orogenic Belt, northwestern China".LITHOS 360(2020):21. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。