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Zircon U‐Pb Geochronological Constraints on Rapid Exhumation of the Mantle Peridotite of the Xigaze Ophiolite, Southern Xizang(Tibet)
Author(s) -
LIU Tong,
WU Fuyuan,
ZHANG Liangliang,
ZHAI Qingguo,
LIU Chuanzhou,
JI Wenbin Ji,
ZHANG Chang,
XU Yang
Publication year - 2016
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12987
Subject(s) - beijing , china , chinese academy of sciences , geology , ophiolite , peridotite , lithosphere , zircon , earth science , mantle (geology) , geochemistry , seismology , archaeology , geography , tectonics
the Yarlung Zangbo suture zone, southern Tibet (Fig. 1). It is characterized by large amounts of ultramafic units with minor mafic rocks. The mafic rocks consist of gabbros, diabases, dolerites and basalts. The gabbroic rocks of the Xigaze ophiolite occur as layered bodies or fine-grained dikes intruding into mantle sections. Small scale gabbroic bodies are well-preserved in Dazhuqu, Baigang and Jiding. However, their formation time and generation mechanism are not well understood or interpreted. In this study, nine samples of mafic rocks from the Xigaze ophiolite, including seven gabbros and two rodingites, were selected for in situ zircon secondary ion mass spectrometry (SIMS) U-Pb and Hf isotopic analyses. These rocks display a geochemical feature like melts of normal mid-ocean ridge (N-MORB) type. The U-Pb data yielded identical ages of 124-129 Ma within uncertainties (Fig. 2). Positive zircon εHf(t) values indicated that these LIU Tong, WU Fuyuan, ZHANG Liangliang, ZHAI Qingguo, LIU Chuanzhou,JI Wenbin Ji, ZHANG Chang and XUYang, 2016. Zircon U-Pb Geochronological Constraints on Rapid Exhumation of the Mantle Peridotite of the Xigaze Ophiolite, Southern Xizang(Tibet). Acta Geologica Sinica (English Edition), 90(supp. 1): 222-223.