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新疆北山盐滩一带侵入岩地球化学特征、时代及地质意义
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引用本文:QU Cui-xia1, YANG Xing-ke1, HE Hu-jun1, GAO Ping2, SONG Hong-ye3. Geochemical features and ages of the intrusive rocks from Yantan belt in Beishan area of Xinjiang and their geological implications[J]. Geology in China, 2013, 40(5): 1409-1420(in Chinese with English abstract).
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Author NameAffiliation
QU Cui-xia1, YANG Xing-ke1, HE Hu-jun1, GAO Ping2, SONG Hong-ye3 1. College of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China2. Geophysical & Geochemical Exploration Corps of Northwest Mining and Geology Group for Nonferrous Metals, Xi'an 710068, Shaanxi, China3. Bohai Sea Logging Drilling Engineering Branch Company, CNPC, Tianjin 300280, China 
基金项目:中国地质调查局新疆北山黑山岭东南1∶5万区域地质矿产调查项目(XJQDZ2006-16)资助。
中文摘要:提要:本文对新疆北山盐滩一带的侵入岩进行了系统的岩石学、岩石地球化学及锆石U-Pb同位素年代学研究。该区侵入岩主要包括闪长岩、花岗闪长岩、二长花岗岩、正长花岗岩、中细粒花岗岩和花岗斑岩,属高钾钙碱性系列和钙碱性系列。稀土元素特征表现为轻稀土富集,重稀土亏损,以及较强的负Eu异常;微量元素表现为富集Rb、Th等大离子亲石元素,而Sr、Nb、Ta等明显亏损。本研究采用锆石SHRIMP U-Pb定年,测得闪长岩和中细粒花岗岩年龄分别为(296±4.1) Ma、(294±3.7) Ma,两者在误差范围内一致,表明其形成时代为早二叠世早期。分析认为该区侵入岩为幔源物质底侵形成的I型花岗岩类,岩石形成于北山裂谷闭合之后的后碰撞构造环境。由此认为北山裂谷在该区的闭合作用在早二叠世早期已经结束。
中文关键词:新疆北山裂谷带  侵入岩  SHRIMP  锆石U-Pb定年  后碰撞花岗岩
 
Geochemical features and ages of the intrusive rocks from Yantan belt in Beishan area of Xinjiang and their geological implications
Abstract:Abstract:This paper deals with petrologic and geochemical features and zircon U-Pb isotope ages of the intrusive rocks from Yantan belt in Beishan area,which are mainly composed of quartz diorite, granodiorite, monzonitic granite, K-feldspar granite, granite and granite-porphyry, belonging to high-K calc-alkaline and calc-alkaline series; All the rocks are characterized by enrichment of LREE,depletion of HREE and strong Eu negative anomalies. The trace elements are enriched in LILE(Rb, Th), and depleted in Sr, Nb, Ta evidently. The zircon SHRIMP U-Pb ages of the quartz diorite and granite are (296±4.1) Ma and (294±3.7) Ma respectively,both of the data are consistent within test errors, suggesting that the rocks were formed at the beginning of the early Permian period. An analysis suggests that these intrusive rocks are I-type granite which are indicative of the underplating of the mantle material into the lower crust and the formation of these rocks in the post-collision tectonic environment after the closure of Beishan rift. The result shows that the Beishan rift was closed in the early Permian in the study area.
keywords:Beishan rift zone in Xinjiang  intrusive rocks  SHRIMP  zircon U-Pb dating  post-collision granites
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