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准噶尔东北缘喀拉通克地区侏罗纪粗安岩的发现及地质意义
投稿时间:2017-07-23  修订日期:2018-07-26  点此下载全文
引用本文:刘松柏,窦虎,张为民,彭志军,张雷,张文瑞.2018.准噶尔东北缘喀拉通克地区侏罗纪粗安岩的发现及地质意义[J].地质论评,64(6):1519-1529,[DOI]:.
LIU Songbai,DOU Hu,ZHANG Weimin,PENG Zhijun,ZHANG Lei,ZHANG Wenrui.2018.Discovery of Jurassic Trachyandesite and Its Geological Significance in the Northwestern of Junggar Basin[J].Geological Review,64(6):1519-1529.
DOI:
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作者单位E-mail
刘松柏 1)陕西地矿第三地质队有限公司陕西宝鸡721300 ddxuesong@163.com 
窦虎 2)陕西地矿综合地质大队陕西渭南714000  
张为民 3)陕西区域地质矿产研究院陕西咸阳712000  
彭志军 3)陕西区域地质矿产研究院陕西咸阳712000  
张雷 3)陕西区域地质矿产研究院陕西咸阳712000  
张文瑞 4)天津市滨海新区大港油田第一采油厂地质研究所天津300280  
基金项目:本文为新疆地质勘查基金两权价款项目“新疆富蕴县卡拉先格尔一带1:5万L45E008022、L45E008023、L45E008024三幅区域地质矿产专项调查”(编号:A16 1 LQ12)的成果。
中文摘要:在准噶尔东北缘富蕴县喀拉通克地区,在原划石炭系姜巴斯套组中新发现了数条粗安质潜火山岩脉,岩石具富钠铝、贫镁铁特征;稀土总量ΣREE为147.58~176.53×10-6,轻稀土相对富集且发生显著分异,重稀土相对亏损;大多数高场强元素略微贫化,大离子元素略为富集,为碱性玄武岩浆分异作用的产物;采用LA ICP MS测得粗安岩中锆石的206Pb/238U年龄为181.9±0.7Ma,为早侏罗世,其证实了准噶尔盆地东北缘存在早侏罗世岩浆活动,对准噶尔东北缘下石炭统的厘定与划分具有重要意义;此次地球化学研究为解决新疆东北部中生代岩浆活动提供了研究性资料,对于研究环准噶尔盆地乃至新疆中生代构造岩浆演化具有重要意义。
中文关键词:中生代  锆石U- Pb年龄  粗安岩  姜巴斯套组  喀拉通克  准噶尔东北缘
 
Discovery of Jurassic Trachyandesite and Its Geological Significance in the Northwestern of Junggar Basin
NameInstitution
LIU Songbai1) The Third Geological Team of Geology and Mineral Exploration and Development of Shaanxi,Co.,Ltd., Baoji,Shaanxi,721300
DOU Hu2) The Comprehensive Geological Brigade of Geology and Mineral Exploration of Shaanxi, Weinan,Shaanxi,714000
ZHANG Weimin3) Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang, Shaanxi,712000
PENG Zhijun3) Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang, Shaanxi,712000
ZHANG Lei3) Academy of Regional Geological Survey and Mineral Resources Exploration of Shaanxi, Xianyang, Shaanxi,712000
ZHANG Wenrui4) Institute of geology, the first oil production plant, Dagang Oilfield Company, PetroChina, Tianjin,300280
Abstract:Objectives: In the Northeastern of Junggar Basin,it discovered several trachyandesites in the originally Carboniferous Jiangbasitao on Fuyun Kalatongke region.it can confirmed the Early Jurassic magmatic activities in the northeastern of Junggar Basin,and provided researching- data for the geochemical study of the Mesozoic volcanic rocks in Junggar Basin, the new discovery is of great significance for determining and dividing carboniferous system and studying the Mesozoic tectonic magma evolution of surrounding Junggar basin and even in Xinjiang. Methods: Based on the field work,through U- Pb dating for trachyandesite zircon by LA- ICP- MS technology and geochemical study to provide the data of the Early Jurassic magmatic activities. Results: The rock has the feature of rich sodium—aluminum and poor magnesium—iron.ΣREE is 147.58~176.53×10-6,the relative enrichment of LREE occur significant differentiation,HREE relative loss; Most of HFSE is slightly poor,LILE is slightly enriched,it’s the product of the differentiation of alkaline basaltic magma. by LA- ICP- MS technology, it obtained the 206Pb/238U age data was 181.9±0.7Ma from the trachyandesite zircon, it show the epoch of intrusion was Early Jurassic. Conclusions: Combined with the research,it can be confirmed that the northeastern of Junggar Basin exists as an Indosinian—Yanshan magmatic activity event.The early Jurassic trachyandesites on Kalatongke region is the product of the differentiation of alkaline basaltic magma,and it may be related to closing of the Ancient Tethys Ocean and Southward subduction of the Siberian plate.
keywords:the Mesozoic  Zircon U- Pb age  Trachyandesite  Jiangbasitao group  Kalatongke  Northeastern of Junggar Basin.
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