SHRIMP zircon U-Pb geochronology of the plagiogranites from Bayringou;ophiolite in North Tianshan Mountains and the petrogenesis of the;ophiolite.

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	SHRIMP zircon U-Pb geochronology of the plagiogranites from Bayringou;ophiolite in North Tianshan Mountains and the petrogenesis of the;ophiolite.
	Xu, XY 4; Xia, LQ ; Ma, ZP ; Wang, YB ; Xia, ZC ; Li, XM ; Wang, LS
刊名	ACTA PETROLOGICA SINICA
	2006
卷号	22 期号:1 页码:83-94
关键词	Bayingou ophiolite fragment plagiogranite SHRIMP zircon U-Pb dating petrogenesis Nothern Tianshan Mountains
ISSN号	1000-0569
英文摘要	The plagiogranites intruding as veins in gabbros in Bayingou ophiolite fragment are depleted in LREE and incompatible elements with (Ce/Yb)(N)=0.67 similar to 0.88, (Gd/Yb)(N)=0.63 similar to 0.73, epsilon(Nd) (t)=9.20 similar to 9.35, Sr-87/Sr-86(t)=0.70365 similar to 0.70408, indicating they are derived from depleted mantle source and is a part of the ophiolite. The representative samples of plagiogranites yield the SHRIMP zircon U-Pb age of 324.8 +/- 7.1 Ma, which is consistent with the formation age of the ophiolite and showing the Bayingou ophiolite occurred in late stage of Early Carboniferous. The gabbros, diabases and basic volcanic rocks in Bayingou ophiolite fragment show flat patterns in chondrite-normalized REE diagram and primitive mantle-normalized trace elements diagram with (Ce/Yb)(N)=0.63 similar to 1.36, (Gd/Yb)(N)=1.02 similar to 1.41 and are characterized by the Sr-87/Sr-86=0.70306 similar to 0.70439, epsilon(Nd) (t)=4.63 similar to 8.37, suggesting the basic magma of the ophiolite mainly originated from N-MORB source but mixed with OIB source during the processes of magma formation. Combining with the study of Carboniferous regional volcanic rocks and the geochronological and geochemical data from the Bayingou ophiolite fragment, can provide us an insight into the understanding of the tectonic setting of the ophiolite: The Bayingou ophiolite occurred in a transition tectonic setting from continental riftism to ocean riftism, which is the geological record of an Early Carboniferous "Red Sea type" ocean basin.
学科主题	火成岩岩石学
WOS关键词	PALEOZOIC ACCRETIONARY ; VOLCANIC-ROCKS ; TRACE-ELEMENT ; CENTRAL-ASIA ; TECTONICS ; GROWTH ; ORIGIN ; CHINA
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000235920900009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38116]
专题	中国地质调查局西安地质调查中心
作者单位	1.Xian Inst Geol & Mineral Resources, Xian 710054, Peoples R China. 2.NW Univ Xian, Xian 710069, Peoples R China. 3.CAGS, Beijing SHRIMP Ctr, Inst Geol, Beijing 100037, Peoples R China. 4.中国地质调查局西安地质调查中心
推荐引用方式 GB/T 7714	Xu, XY,Xia, LQ,Ma, ZP,et al. SHRIMP zircon U-Pb geochronology of the plagiogranites from Bayringou;ophiolite in North Tianshan Mountains and the petrogenesis of the;ophiolite.[J]. ACTA PETROLOGICA SINICA,2006,22(1):83-94.
APA	Xu, XY.,Xia, LQ.,Ma, ZP.,Wang, YB.,Xia, ZC.,...&Wang, LS.(2006).SHRIMP zircon U-Pb geochronology of the plagiogranites from Bayringou;ophiolite in North Tianshan Mountains and the petrogenesis of the;ophiolite..ACTA PETROLOGICA SINICA,22(1),83-94.
MLA	Xu, XY,et al."SHRIMP zircon U-Pb geochronology of the plagiogranites from Bayringou;ophiolite in North Tianshan Mountains and the petrogenesis of the;ophiolite.".ACTA PETROLOGICA SINICA 22.1(2006):83-94.