[1]肖 林,程招勋,都士卓,等.乌兰浩特地区中性火山岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及成因探讨[J].华东地质,2019,40(04):253-263.[doi:10.16788/j.hddz.32-1865/P.2019.04.002]
 XIAO Lin,CHENG Zhao-xun,DU Shi-zhuo,et al.LA-ICP-MS zircon U-Pb age, geochemistry and genesis of intermediate volcanic rocks in the Ulanhot area, Inner Mongolia[J].East China Geology,2019,40(04):253-263.[doi:10.16788/j.hddz.32-1865/P.2019.04.002]
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乌兰浩特地区中性火山岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及成因探讨()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
40
期数:
2019年04期
页码:
253-263
栏目:
基础地质
出版日期:
2019-12-01

文章信息/Info

Title:
LA-ICP-MS zircon U-Pb age, geochemistry and genesis of intermediate volcanic rocks in the Ulanhot area, Inner Mongolia
文章编号:
2096-1871(2019)04-253-11
作者:
肖 林程招勋都士卓张允鹏
(黑龙江省地质调查研究总院,哈尔滨 150036)
Author(s):
XIAO LinCHENG Zhao-xunDU Shi-zhuoZHANG Yun-peng
(Heilongjiang Institute of Geological Survey, Harbin 150036, China)
关键词:
中性火山岩 锆石U-Pb年龄 地球化学特征 内蒙古乌兰浩特地区
Keywords:
intermediate volcanic rock zircon U-Pb age geochemical characteristics Ulanhot area Inner Mongolia
分类号:
P588.12
DOI:
10.16788/j.hddz.32-1865/P.2019.04.002
文献标志码:
A
摘要:
乌兰浩特地区出露一套以辉石安山岩为主的中性火山岩组合。LA-ICP-MS锆石U-Pb测年结果显示,该套火山岩锆石U-Pb年龄为130.0±1.5 Ma和129.9±1.4 Ma,表明其形成于早白垩世。辉石安山岩SiO2含量为57.84%~60.86%, Al2O3含量为16.49%~17.76%, A/CNK>1.1,属过铝质岩石; ALK值为11.19%~11.87%,σ为1.08~1.98; ∑REE为(128.69~145.06)×10-6,(La/Sm)N为4.64~5.24,(La/Yb)N为6.58~8.09,轻稀土元素富集程度高且轻、重稀土元素分馏明显; Eu异常不明显,大离子亲石元素Rb、Ba、K、Sr富集,高场强元素Nb、Ti、P、Ta亏损,推断该中性火山岩的形成与蒙古—鄂霍次克洋闭合陆壳加厚之后的岩石圈伸展有关。
Abstract:
Abstract:A set of intermediate volcanic rock assemblages dominated by pyroxene andesite is exposed in the Ulanhot area. The LA-ICP-MS zircon U-Pb dating results show that the volcanic rocks have two zircon U-Pb ages of 130.0 ±1.5 Ma and 129.9 ±1.4 Ma, suggesting that the volcanic rocks were formed in the Early Cretaceous. Pyroxene andesite has SiO2 content of 57.84%~60.86%, Al2O3 of 16.49%~17.76%, A/CNK> 1.1, suggesting that the rock belongs to peraluminous rock. ALK value is 11.19%~11.87%, σ is 1.08~1.98. ∑REE of(128.69~145.06)×10-6,(La/Sm)N of 4.64~5.24 and(La/Yb)N of 6.58~8.09 show enrichment of light rare earth elements and distinct fractionation of light and heavy rare earth element. Weak Eu anomaly, enrichment of large ion lithophile elements(Rb, Ba, K and Sr)and depletion of high field strength elements(Nb, Ti, P and Ta)suggest that its formation is related to the lithospheric extension which followed continental crust thickening after closure of the Mongolian-Okhotsk Ocean.

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备注/Memo

备注/Memo:
*收稿日期:2018-10-24 修订日期:2019-04-10 责任编辑:谭桂丽
基金项目:中国地质调查局“内蒙古1:5万前公主陵等六幅区域地质调查(编号:DD20160048-10)”项目资助。
第一作者简介:肖林,1991年生,男,助理工程师,主要从事区域地质矿产调查工作。
更新日期/Last Update: 2019-11-25