Two contrasting eclogite types on the northern margin of the Qaidam;basin, western China | |
Zhang, JX; Yang, JS; Xu, ZQ; Wan, YS; Meng, FC; Li, HB; Shi, RD; Song, SU | |
刊名 | ACTA GEOLOGICA SINICA-ENGLISH EDITION |
2002 | |
卷号 | 76期号:3页码:331-338 |
关键词 | northern margin of the Qaidam basin eclogite PT paths tectono-thermal history |
ISSN号 | 1000-9515 |
英文摘要 | Eclogites have been recently discovered in the Xitieshan area in the middle segment of the northern margin of the Qaidam basin. These eclogites, together with those recognized earlier in the Yuka area of the western segment of the northern margin of the Qaidam basin and in the Dulan area of the eastern segment of the northern margin of the Qaidam basin, form an eclogite belt with a length of 350 km. A comparison of the eclogites from the Yuka and Xitieshan areas suggests that they show different country rocks, microtextures, mineral assemblages, and especially, different peak temperatures, PT paths during decompression and isotopic features. Eclogites from the Yuka area bear evidence of prograde metamorphism, such as prograde mineral relics in garnet and growth zoning of garnet, and hairpin-shaped PT paths with coincidence of the baric and thermal peaks of metamorphism, which reflect rapid burial and uplift. Sm-Nd isotopic determination shows obvious Sm-Nd disequilibrium, and no isochron ages of Early Paleozoic metamorphism was obtained. On the contrary, the Xitieshan eclogite was subjected to metamorphism of higher eclogite-facies and post-eclogite-facies temperatures, showing an obvious granulite-facies overprint. A tentative PT path for the Xitieshan area suggests that the baric peak preceded the thermal culmination. Whole rock-garnet-omphacite Sm-Nd isotopic data give an isochron age in the Early Paleozoic. The differences between the two eclogites imply their different tectonic-thermal history during their burial and uplift. |
学科主题 | 变质岩岩石学 |
WOS关键词 | SM-ND ; PRESSURE ; GARNET ; GEOTHERMOMETER ; MINERALS ; ROCKS |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | GEOLOGICAL SOC CHINA |
WOS记录号 | WOS:000179589700007 |
内容类型 | 期刊论文 |
源URL | [http://119.78.100.197/handle/2HKVOGP0/37518] |
专题 | 中国地质科学院地质研究所 |
作者单位 | Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. |
推荐引用方式 GB/T 7714 | Zhang, JX,Yang, JS,Xu, ZQ,et al. Two contrasting eclogite types on the northern margin of the Qaidam;basin, western China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2002,76(3):331-338. |
APA | Zhang, JX.,Yang, JS.,Xu, ZQ.,Wan, YS.,Meng, FC.,...&Song, SU.(2002).Two contrasting eclogite types on the northern margin of the Qaidam;basin, western China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,76(3),331-338. |
MLA | Zhang, JX,et al."Two contrasting eclogite types on the northern margin of the Qaidam;basin, western China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 76.3(2002):331-338. |
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