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	Petrology, geochemistry and isotopic ages of eclogites from the Dulan UHPM Terrane, the North Qaidam, NW China
	Song, SG ; Yang, JS ; Liou, JG ; Wu, CL ; Shi, RD ; Xu, ZQ
	2003
关键词	eclogite UHP terrane geochemistry Sm-Nd isotopic ages Dulan NW China ULTRAHIGH-PRESSURE METAMORPHISM SM-ND TECTONIC IMPLICATIONS DABIE MOUNTAINS BOHEMIAN MASSIF WESTERN ALPS U-PB ROCKS COESITE COMPLEX
英文摘要	The Dulan eclogite-gneiss region is located in the eastern part of the North Qaidam eclogite belt, NW China. Widespread evidence demonstrates that this region is a typical ultrahigh-pressure (UHP) metamorphic terrane. Eclogites occur as lenses or layers in both granitic and pelitic gneisses. Two distinguished sub-belts can be recognized and differ in mineralogy, petrology and geochemistry. The North Dulan Belt (NDB) has tholeiitic protoliths with high TiO(2) and lower Al(2)O(3) and MgO contents. REE patterns and trace element contents resemble those of N-type and E-type MORB. In contrast, eclogites in the South Dulan Belt (SDB) are of island arc protoliths with low TiO(2), high Al(2)O(3) and show LREE-enriched and HFSE-depleted patterns. Sm-Nd isotope analyses give isochron ages of 458-497 Ma for eclogite-facies metamorphism for the two sub-belts. The ages are similar to those of Yuka and Altun eclogites in the western extension of the North Qaidam-Altun eclogite belt. The Dulan UHP metamorphic terrane, together with several other recently recognized eclogite-bearing terrenes within the North Qaidam-Altun HP-UHP belt, constitute the key to the understanding of the tectonic evolution of the northern Tibetan Plateau. The entire UHP belt extends for more than 1000 km from the Dulan UHP terrane in the southeast to the Altun eclogite-gneiss terrane in the west. This super-belt marks an early Paleozoic continental collision zone between the Qaidam Massif and the Qilian Massif. (C) 2003 Elsevier B.V. All rights reserved.; Geochemistry & Geophysics; Mineralogy; SCI(E); CPCI-S(ISTP); 97
语种	英语
DOI标识	10.1016/S0024-4937(03)00099-9
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/156100]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Song, SG,Yang, JS,Liou, JG,et al. Petrology, geochemistry and isotopic ages of eclogites from the Dulan UHPM Terrane, the North Qaidam, NW China. 2003-01-01.

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