Petrology and geochemistry of dunites, chromitites and mineral   inclusions from the Gaositai Alaskan-type complex, North China Craton:   Implications for mantle source characteristics

doi:10.1016/j.lithos.2011.08.013

CORC > 北京大学 > 地球与空间科学学院

	Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan-type complex, North China Craton: Implications for mantle source characteristics
	Tian, W. ; Chen, B. ; Ireland, T. R. ; Green, D. H. ; Suzuki, K. ; Chu, Z.
刊名	lithos
	2011
关键词	Clinopyroxene inclusions Trace elements Re-Os isotopes Chromite Dunite North China craton SPINEL OXYGEN GEOBAROMETER ISLAND-ARC ANKARAMITES ASIAN OROGENIC BELT CHROMIAN SPINEL MELT INCLUSIONS EXPERIMENTAL CALIBRATION PETROGENETIC INDICATOR TECTONIC IMPLICATIONS LITHOSPHERIC MANTLE ISOTOPE SYSTEMATICS
DOI	10.1016/j.lithos.2011.08.013
英文摘要	The Gaositai complex is a typical Alaskan-type intrusion, emplaced in the northern margin of the North China Craton at about 280 Ma. It is a concentrically zoned intrusion, with dunite in the core, rimmed by wehrlite, clinopyroxenite and hornblendite outwards. To understand the chemical compositions of the parent magma to the ultramafic complex, and thus that of the mantle source, we conduct petrological and geochemical studies on the dunite core and high-Mg clinopyroxene (cpx) inclusions in the chromitite from the rock unit, including the major and trace elements of cpx inclusions and whole-rock Re-Os isotope of the chromitites and chromite-rich dunites. The cpx inclusions have chemical compositions similar to the high Mg# cpx of primitive ankaramite, suggesting that the cpx inclusions could have formed from a primitive parent magma. The calculated chemical compositions of the primitive parent magma are characterized by high Mg# and CaO, with CaO/Al2O3 ratios >1, and enriched in Sr and other large ion lithophile elements compared to high field strength and rare earth elements. This, together with the high fO(2) (up to FMQ + 2.83) of chromitite, suggests that the parent magma was a typical arc ankaramite (wet and CaO-rich picrite), originated probably from a hydrous-carbonatite fluxed sub-continental lithospheric mantle above a subduction zone that formed as a result of the subduction of the paleo-Asian oceanic slab beneath the north China craton in late Paleozoic. (C) 2011 Elsevier B.V. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298070600011&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geochemistry & Geophysics; Mineralogy; SCI(E); 11; ARTICLE; 1-2; 165-175; 127
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155763]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Tian, W.,Chen, B.,Ireland, T. R.,et al. Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan-type complex, North China Craton: Implications for mantle source characteristics[J]. lithos,2011.
APA	Tian, W.,Chen, B.,Ireland, T. R.,Green, D. H.,Suzuki, K.,&Chu, Z..(2011).Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan-type complex, North China Craton: Implications for mantle source characteristics.lithos.
MLA	Tian, W.,et al."Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan-type complex, North China Craton: Implications for mantle source characteristics".lithos (2011).