Incremental growth and origin of the Cretaceous Renjiayingzi pluton,;southern Inner Mongolia, China: Evidence from structure, geochemistry;and geochronology

doi:10.1016/j.jseaes.2013.07.005

	Incremental growth and origin of the Cretaceous Renjiayingzi pluton,;southern Inner Mongolia, China: Evidence from structure, geochemistry;and geochronology
	Li, Shan 4; Wilde, Simon A.; Wang, Tao ; Guo, Qianqian 2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2013
卷号	75 页码:226-242
关键词	Cretaceous pluton Magmatic emplacement Incremental growth Zircon U-Pb ages Zircon Hf isotopes Southern CAOB
ISSN号	1367-9120;EI 1878-5786
DOI	10.1016/j.jseaes.2013.07.005
英文摘要	The Renjiayingzi intermediate-acid pluton is located along a pre-existing ENE-WSW-trending dextral shear zone that forms part of the Xar Moron suture zone that marks the final closure of the Paleo-Asian Ocean. The pluton is composed of three small intrusions, which from northwest to southeast, are named the Shuangjianshan (SI), the Qianweiliansu (QI) and the Xingshuwabeishan (XI) intrusions. LA-ICPMS zircon U-Pb dating of a pyroxene diorite from the SI yields an age of 138 +/- 1 Ma; the SHRIMP zircon U-Pb age of a tonalite from the QI records an age of 134 +/- 2 Ma, whereas LA-ICPMS zircon U-Pb dating of a monzogranite from the Xl has an age of 126 +/- 1 Ma, suggesting the entire pluton was built up by three separate emplacement events that young to the ESE: this is further supported by the contact relations. Incremental growth of plutons by amalgamation of repeated small magma pulses is the most viable emplacement model. The pluton was probably emplaced by updoming of the roof along previous tensile fractures and by upward stacking of the three intrusions. The SI and QI have similar U-Pb ages and geochemical characteristics, and most likely had the same magma source and underwent similar petrogenetic processes. They have high MgO concentrations at low silica contents, are enriched in large ion lithophile elements, depleted in high field strength elements, have negative sNd(r) values of -1.8 to -3.7, with Nd model ages of 1.07-1.19 Ga. Pyroxene diorites of the SI also have variable zircon 4,0) values (from -0.8 to +6.1), indicating that they were mainly derived from juvenile crust with minor crustal contamination and clinopyroxene-dominated fractional crystallization. The late monzogranites from the XI show weak negative ENd(t) values of -2.3 to -2.5, young Nd model ages of 0.99-1.00 Ga, positive zipcon sH,(t) values (+1.3 to +4.6) and higher SiO2 and K2O contents, with strong depletion in Eu, P and Ti, indicating derivation from a distinct petrogenetic process from the two earlier intrusions. The monzogranites were the result of partial melting of juvenile crust in response to mantle-derived magma underplating, together with plagioclase-dominated fractional crystallization. (C) 2013 Elsevier Ltd. All rights reserved.
学科主题	构造地质学
WOS关键词	ASIAN OROGENIC BELT ; TUOLUMNE INTRUSIVE SUITE ; U-PB AGES ; CONTINENTAL ; GROWTH ; MAGMA CHAMBERS ; SIERRA-NEVADA ; EMPLACEMENT MECHANISMS ; TECTONIC ; SIGNIFICANCE ; SUBDUCTION-ACCRETION ; MULTIPLE SUBDUCTION
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000324961400019
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40108]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Wilde, Simon A.] Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia. 3.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Li, Shan,Wilde, Simon A.,Wang, Tao,et al. Incremental growth and origin of the Cretaceous Renjiayingzi pluton,;southern Inner Mongolia, China: Evidence from structure, geochemistry;and geochronology[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,75:226-242.
APA	Li, Shan,Wilde, Simon A.,Wang, Tao,&Guo, Qianqian.(2013).Incremental growth and origin of the Cretaceous Renjiayingzi pluton,;southern Inner Mongolia, China: Evidence from structure, geochemistry;and geochronology.JOURNAL OF ASIAN EARTH SCIENCES,75,226-242.
MLA	Li, Shan,et al."Incremental growth and origin of the Cretaceous Renjiayingzi pluton,;southern Inner Mongolia, China: Evidence from structure, geochemistry;and geochronology".JOURNAL OF ASIAN EARTH SCIENCES 75(2013):226-242.