Important role of magma mixing in generating the Mesozoic   monzodioritic-granodioritic intrusions related to Cu mineralization,   Tongling, East China: Evidence from petrological and in situ Sr-Hf   isotopic data

doi:10.1016/j.lithos.2016.01.009

CORC > 北京大学 > 地球与空间科学学院

	Important role of magma mixing in generating the Mesozoic monzodioritic-granodioritic intrusions related to Cu mineralization, Tongling, East China: Evidence from petrological and in situ Sr-Hf isotopic data
	Chen, C. J. ; Chen, B. ; Li, Z. ; Wang, Z. Q.
刊名	LITHOS
	2016
关键词	Monzodioritic-granodioritic intrusions In situ plagioclase Sr isotopes Magma mixing Tongling COPPER-GOLD MINERALIZATION LOWER YANGTZE REGION SHIZISHAN ORE-FIELD U-PB GEOCHRONOLOGY NORTH CHINA SOUTH CHINA CONTINENTAL-CRUST ANHUI PROVINCE GEOCHEMICAL CHARACTERISTICS EXPERIMENTAL CALIBRATION
DOI	10.1016/j.lithos.2016.01.009
英文摘要	The Mesozoic ore-bearing high-Mg monzodioritic-granodioritic rocks in the Tongling mining district (East China) have been described as having adakitic affinities, and their origin has been attributed to partial melting of delaminated eclogite at depth in the mantle, followed by interaction of the resultant granitic magma with mantle peridotite. Here we present petrological data and in situ Sr isotopic data for zoned plagioclase that are inconsistent with the eclogite-derived model and instead propose a model that involves magma mixing of siliceous crustal melts and basaltic magma that was derived from metasomatized mantle in a back-arc extensional regime. The principal geochemical signatures of these Mesozoic rocks include a high-K calc-alkaline affinity, high values of Mg#, high Sr-Ba abundances, high Sr/Y and La/Yb ratios, epsilon(Nd)(t) = -13.1 to -9.0, and I-sr = 0.70707-0.70824. The magma mixing model is supported by (1) the common existence of mafic microgranular enclaves (MMEs) and the disequilibrium textures of plagioclase and amphibole, (2) the Sr-87/Sr-86 ratios of embayed high-Ca cores of plagioclase that are distinctly lower than in the euhedral low-Ca overgrowth rims, (3) the negative correlations between whole-rock Nd and Sr isotopic ratios, and (4) the significant differences in the values of 410) (-9.5 to -26) within different zircons from the same intrusion. (C) 2016 Elsevier B.V. All rights reserved.; Natural Science Foundation of China [41272067, 41530206]; SCI(E); ARTICLE; binchen@pku.edu.cn; 80-93; 248
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/438364]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Chen, C. J.,Chen, B.,Li, Z.,et al. Important role of magma mixing in generating the Mesozoic monzodioritic-granodioritic intrusions related to Cu mineralization, Tongling, East China: Evidence from petrological and in situ Sr-Hf isotopic data[J]. LITHOS,2016.
APA	Chen, C. J.,Chen, B.,Li, Z.,&Wang, Z. Q..(2016).Important role of magma mixing in generating the Mesozoic monzodioritic-granodioritic intrusions related to Cu mineralization, Tongling, East China: Evidence from petrological and in situ Sr-Hf isotopic data.LITHOS.
MLA	Chen, C. J.,et al."Important role of magma mixing in generating the Mesozoic monzodioritic-granodioritic intrusions related to Cu mineralization, Tongling, East China: Evidence from petrological and in situ Sr-Hf isotopic data".LITHOS (2016).