Geochemistry, geochronology and zircon Hf isotopic study of   peralkaline-alkaline intrusions along the northern margin of the North   China Craton and its tectonic implication for the southeastern Central   Asian Orogenic Belt

doi:10.1016/j.lithos.2015.12.013

CORC > 北京大学 > 地球与空间科学学院

	Geochemistry, geochronology and zircon Hf isotopic study of peralkaline-alkaline intrusions along the northern margin of the North China Craton and its tectonic implication for the southeastern Central Asian Orogenic Belt
	Zhao, Pan ; Jahn, Bor-ming ; Xu, Bei ; Liao, Wen ; Wang, Yanyang
刊名	LITHOS
	2016
关键词	Peralkaline-alkaline intrusion Middle Permian Southern Inner Mongolia Central Asian Orogenic Belt Post-orogenic extension A-TYPE GRANITES MONGOLIAN-TRANSBAIKALIAN BELT SUBDUCTION-ACCRETION COMPLEX U-PB GEOCHRONOLOGY COLLECTOR ICP-MS LA-MC-ICPMS INNER-MONGOLIA VOLCANIC-ROCKS GEOLOGICAL SIGNIFICANCE PERIDOTITE INTERACTION
DOI	10.1016/j.lithos.2015.12.013
英文摘要	A giant Permian alkaline magmatic belt has recently been identified in southern Inner Mongolia, along the northern margin of the North China Craton (NCC). This belt is mainly composed of syenite, quartz syenite, alkaline granite and mafic microgranular enclaves (MME)-bearing granodiorite. In order to study the petrogenesis and tectonic implications of these rocks, we undertook zircon U-Pb dating and geochemical analysis of two Permian alkaline plutons. The first Guangxingyuan Pluton occurs in the Hexigten area and is composed of MME -bearing tonalite, K-feldspar granite and syenite. The second Durenwuliji Pluton, located in the Xianghuangqi area, comprises syenite, quartz syenite and K-feldspar granite. Zircon U-Pb dating on tonalite, K-feldspar granite, syenite and quartz syenite from the two plutons yielded a tight range of ages from 259 to 267 Ma. The peralkaline-alkaline rocks show high abundance of total alkalis (K2O + Na2O = 7.9-12.9%) and K2O contents (3.9-8.0%), enrichment in large ion lithophile elements (LILE) and light rare earth element (LREE), and depletion of high field strength elements (HFSE). The associated tonalite and MMEs display I-type granitic geochemical affinity, with less total abundance of trace elements than the peralkaline-alkaline rocks. Zircon Hf isotopic analysis of the Guangxingyuan pluton yielded a large range of epsilon(Hf)(t) values from -15.5 to +6.7 and model ages (TEM) from 781 to 2012 Ma. By contrast, the Hf isotopic data of the Durenwuliji pluton shows a small range of epsilon(Hf)(t) from +6.2 to +8.9 and T-DM(C) from 667 to 816 Ma. The geochemical and Hf isotopic characteristics indicate that the parental magma was derived from a mixing of metasomatic mantle-derived mafic magma with different amount of crust-derived felsic magma, and followed by fractional crystallization. Considering previous tectonic studies in Inner Mongolia, a Permian post-orogenic extension was proposed to account for these peralkaline-alkaline intrusions following the amalgamation of NCC and its northern blocks in the southeastern part of Central Asian Orogenic Belt. (C) 2015 Elsevier B.V. All rights reserved.; National Key Basic Research Program of China [2013CB429806]; National Science Foundation of China [40872145, 41121062]; Ministry of Science and Technology (MOST) of Taiwan [MOST 103-2116-M-002-013, MOST104-2923-M-002-005]; SCI(E); ARTICLE; bxu@pku.edu.cn; ,SI; 92-108; 261
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/447959]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhao, Pan,Jahn, Bor-ming,Xu, Bei,et al. Geochemistry, geochronology and zircon Hf isotopic study of peralkaline-alkaline intrusions along the northern margin of the North China Craton and its tectonic implication for the southeastern Central Asian Orogenic Belt[J]. LITHOS,2016.
APA	Zhao, Pan,Jahn, Bor-ming,Xu, Bei,Liao, Wen,&Wang, Yanyang.(2016).Geochemistry, geochronology and zircon Hf isotopic study of peralkaline-alkaline intrusions along the northern margin of the North China Craton and its tectonic implication for the southeastern Central Asian Orogenic Belt.LITHOS.
MLA	Zhao, Pan,et al."Geochemistry, geochronology and zircon Hf isotopic study of peralkaline-alkaline intrusions along the northern margin of the North China Craton and its tectonic implication for the southeastern Central Asian Orogenic Belt".LITHOS (2016).