西藏唐加地区卓隆普斜长角闪岩锆石U-Pb年代学、地球化学及地质意义

P581%P597+.3; 本文以西藏唐加地区卓隆普斜长角闪岩为研究对象,通过岩相学、锆石U-Pb年代学和全岩地球化学组成分析,探讨了其岩石成因以及对松多古特提斯洋演化的地质意义.结果显示,卓隆普斜长角闪岩原岩形成于264.7±1.3 Ma(n=28,MSWD=0.88),属中二叠世.全岩地球化学特征显示该套岩石呈钙碱性,富集轻稀土元素(LREE/HREE=4.69~4.88),弱铕异常(δEu=0.81);样品富集大离子亲石元素(LILEs),具有强烈的Nb-Ta负异常,表现出岛弧玄武岩亲缘性.多种判别图解显示斜长角闪岩原岩形成于俯冲相关的岛弧环境,原岩岩浆由俯冲大洋板片和洋壳物质融熔体以及...

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Published in地质与勘探 Vol. 58; no. 5; pp. 1016 - 1026
Main Authors 钟摇, 朱利东, 杨文光, 解龙, 麦源君, 张洪亮, 李楠, 周豫
Format Journal Article
LanguageChinese
Published 成都理工大学沉积地质研究院,四川成都 610059%成都理工大学地球科学学院,四川成都 610059 01.09.2022
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ISSN0495-5331
DOI10.12134/j.dzykt.2022.05.009

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Abstract P581%P597+.3; 本文以西藏唐加地区卓隆普斜长角闪岩为研究对象,通过岩相学、锆石U-Pb年代学和全岩地球化学组成分析,探讨了其岩石成因以及对松多古特提斯洋演化的地质意义.结果显示,卓隆普斜长角闪岩原岩形成于264.7±1.3 Ma(n=28,MSWD=0.88),属中二叠世.全岩地球化学特征显示该套岩石呈钙碱性,富集轻稀土元素(LREE/HREE=4.69~4.88),弱铕异常(δEu=0.81);样品富集大离子亲石元素(LILEs),具有强烈的Nb-Ta负异常,表现出岛弧玄武岩亲缘性.多种判别图解显示斜长角闪岩原岩形成于俯冲相关的岛弧环境,原岩岩浆由俯冲大洋板片和洋壳物质融熔体以及其脱水过程中形成的俯冲流体交代上覆地幔楔形成,岩浆上升过程中可能受到轻微的地壳物质混染.结合区域资料,本次研究认为唐加-松多古特提斯洋在265 Ma(中二叠世)之前已经发生俯冲.
AbstractList P581%P597+.3; 本文以西藏唐加地区卓隆普斜长角闪岩为研究对象,通过岩相学、锆石U-Pb年代学和全岩地球化学组成分析,探讨了其岩石成因以及对松多古特提斯洋演化的地质意义.结果显示,卓隆普斜长角闪岩原岩形成于264.7±1.3 Ma(n=28,MSWD=0.88),属中二叠世.全岩地球化学特征显示该套岩石呈钙碱性,富集轻稀土元素(LREE/HREE=4.69~4.88),弱铕异常(δEu=0.81);样品富集大离子亲石元素(LILEs),具有强烈的Nb-Ta负异常,表现出岛弧玄武岩亲缘性.多种判别图解显示斜长角闪岩原岩形成于俯冲相关的岛弧环境,原岩岩浆由俯冲大洋板片和洋壳物质融熔体以及其脱水过程中形成的俯冲流体交代上覆地幔楔形成,岩浆上升过程中可能受到轻微的地壳物质混染.结合区域资料,本次研究认为唐加-松多古特提斯洋在265 Ma(中二叠世)之前已经发生俯冲.
Author 麦源君
张洪亮
解龙
朱利东
周豫
钟摇
杨文光
李楠
AuthorAffiliation 成都理工大学沉积地质研究院,四川成都 610059%成都理工大学地球科学学院,四川成都 610059
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Author_FL ZHONG Yao
ZHANG Hongliang
ZHOU Yu
ZHU Lidong
XIE Long
MAI Yuanjun
LI Nan
YANG Wenguang
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Keywords 锆石U-Pb定年
卓隆普
唐加地区
西藏
唐加-松多古特提斯洋
地球化学
岛弧
斜长角闪岩
中二叠世
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Snippet P581%P597+.3; 本文以西藏唐加地区卓隆普斜长角闪岩为研究对象,通过岩相学、锆石U-Pb年代学和全岩地球化学组成分析,探讨了其岩石成因以及对松多古特提斯洋演化的地质意义....
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