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藏南仲巴地层分区才巴弄组变质玄武质火山岩的发现及其意义
引用本文:张振利,专少鹏,李广栋,张计东,孙肖,李先,汪立军,刘鸿章.藏南仲巴地层分区才巴弄组变质玄武质火山岩的发现及其意义[J].地质通报,2007,26(4):410-416.
作者姓名:张振利  专少鹏  李广栋  张计东  孙肖  李先  汪立军  刘鸿章
作者单位:河北省地质调查院区域地质调查所,河北,廊坊,065000
基金项目:中国地质调查局青藏高原1:25万亚热幅(H44C001003)、普兰县幅(国内部分)(H44C002003)、霍尔巴幅(H44C022004)、巴巴扎东幅(国内部分)(H44C003004)地调项目成果.致谢:本文是集体劳动的成果,对其他项目组成员、样品测试鉴定单位与专家、审稿专家,一并致以衷心的感谢!
摘    要:藏南仲巴地层分区新发现了一套地层,在仲巴县才巴弄一带发育齐全,上下接触关系清楚,命名为才巴弄组。该套地层以变质玄武岩、变质杏仁状玄武岩为主,下部可见变质玄武质角砾熔岩,上部可见变质石英粗安岩。其中变质玄武岩与变质杏仁状玄武岩、变质玄武岩与变质石英粗安岩多呈韵律性互层产出,显示了火山喷发韵律的特征。变质玄武岩的地球化学特征与大陆裂谷型火山岩一致,形成于活动陆棚裂陷(谷)盆地的构造环境。这一发现为进一步探讨冈瓦纳超级古大陆的裂解和新特提斯的开启提供了新的重要线索。

关 键 词:藏南仲巴地层分区  才巴弄组  变质玄武质火山岩  大陆裂谷型  活动陆棚裂陷(谷)盆地
文章编号:1671-2552(2007)04-0410-07
收稿时间:8/4/2006 12:00:00 AM
修稿时间:2007-01-17

Discovery of metabasaltic rocks in the Caibalong Formation in the Zhongba stratigraphic area, southern Tibet, China and their significance
ZHANG Zhen-li,ZHUAN Shao-peng,LI Guang-dong,ZHANG Ji-dong,SUN Xiao,LI Xian,WANG Li-jun,LIU Hong-zhang.Discovery of metabasaltic rocks in the Caibalong Formation in the Zhongba stratigraphic area, southern Tibet, China and their significance[J].Geologcal Bulletin OF China,2007,26(4):410-416.
Authors:ZHANG Zhen-li  ZHUAN Shao-peng  LI Guang-dong  ZHANG Ji-dong  SUN Xiao  LI Xian  WANG Li-jun  LIU Hong-zhang
Institution:Institute of Regional Geological Survey, Hebei Institute of Geological Survey, Langfang 065000, Hebei, China
Abstract:Recently a sequence of strata has been found in the Zhongba stratigraphic area, southern Tibet. It is complete and its contact relationships with the overlying and underlying strata are clear in the Caibalong area, Zhongba County; so it is named the Caibalong Formation. This sequence of strata consists predominantly of metabasalt and amygdaloidal metabasalt, with metabasaltic breccia lavas seen in the lower part and quartz meta-trachyandesite in the upper part. The metabasalt and amygdaloidal metabasalt and the metabasalt and quartz meta-trachyandesite mostly occur as rhythmic alternating beds, exhibiting the rhythmic characteristics of volcanic eruption. The geochemical characteristics of the metabasalt agree with those of continental rift type volcanic rocks, forming a tectonic environment of the active shelf rift basin. This discovery provides a new important clue to the study of the breakup of the supercontinent Gondwana and opening of the Neo-Tethys.
Keywords:Zhongba stratigraphic area  southern Tibet  Caibalong Formation  metabasaltic rock  continental rift type  active shelf rift basin
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