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西藏班戈北部早白垩世火山岩:班公湖—怒江洋闭合的岩浆记录
Received:August 14, 2019  Revised:December 23, 2019  点此下载全文
引用本文:WU Hao,ZHAI Qingguo,HU Peiyuan,TANG Yue,ZHU Zhicai,WANG Wei,XIE Chaoming,QIANGBA Zhaxi. Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean[J]. Geology in China, 2021, 48(5): 1623-1638(in Chinese with English abstract).
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Author NameAffiliationE-mail
WU Hao Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  
ZHAI Qingguo Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China zhaiqingguo@126.com 
HU Peiyuan Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  
TANG Yue Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  
ZHU Zhicai Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  
WANG Wei Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China  
XIE Chaoming College of Earth Science, Jilin University, Changchun 130061, Jilin, China  
QIANGBA Zhaxi Regional Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 851400, Tibet, China  
基金项目:国家自然科学基金项目(42072268、42002069、41872240)、第二次青藏高原综合科学考察(2019QZKK0703)和中国地质调查局项目(DD20190370、DD20190060)联合资助。
中文摘要:对班戈县北部马前乡地区的早白垩世安山岩和英安岩进行了详细的地质填图及岩石学、年代学、地球化学和Hf同位素研究。锆石U-Pb定年获得安山岩年龄分别为(108.0±1.5)Ma和(113.6±0.9)Ma;英安岩年龄为(106.7±1.9)Ma和(113.6±0.8)Ma。安山岩富集Th和U,亏损Nb、Ta和Ti,具有变化范围较大的Mg#值(25~63),锆石εHft)值(-8.6~+1.5)以负值为主,应当为幔源镁铁质熔体与壳源熔体的混合产物。英安岩具有与安山岩类似的微量元素成分特征及负的锆石εHft)值(-12.3~-8.1),应当是地壳部分熔融的产物。结合前人研究成果认为,这些早白垩世岩浆岩是约110 Ma沿班公湖-怒江缝合带岩浆大爆发的产物,可能与班公湖-怒江洋闭合之后的拉萨与羌塘地块陆-陆碰撞有关。
中文关键词:早白垩世火山岩  地球化学  岩石成因  岩浆混合  地质调查工程  班公湖—怒江缝合带
 
Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean
Abstract:The petrological, zircon U-Pb dating, whole-rock geochemical, and zircon Hf isotopic data of the Early Cretaceous andesites and dacites in the Maqianxiang area of Baingoin County, Tibet, are reported. The zircon U-Pb ages of andesite are (108.0±1.5)Ma and (113.6±0.9) Ma, and those of dacite are (106.7±1.9) Ma and (113.6±0.8) Ma. The andesites are enriched in Th and U and depleted in Nb, Ta, and Ti, have variable Mg# values (25-63), and show mainly negative zircon εHf(t) values (-8.6 to +1.5). They are probably generated by mixing of mantle- and crust-derived melts. Dacite shares similar trace element features with the coeval andesite, and has negative zircon εHf(t) values (-12.3 to -8.1). It is interpreted as a product of partially melting crust. The andesite and dacite are interpreted as a product of the ca.110 Ma magmatism along the Bangong-Nujiang suture zone, and may be related to the continent-continent collision process after the closure of the Bangong-Nujiang Ocean.
keywords:Early Cretaceous volcanics  geochemistry  petrogenesis  magma mixing  geological survey engineering  Bangong-Nujiang suture zone  Tibet
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