摘要
益阳火山岩中的熔岩、辉长辉绿岩和玄武质科马提岩,分别与蛇绿岩套中的熔岩、熔岩中的脉岩或岩墙杂岩和层状堆晶辉长岩有相似或相同的化学成分与微量元素含量,它们具有蛇绿岩套属性。与邻区广西、江西和安徽等省的蛇绿岩套分布在同一带上。因而认为,湖南境内沿通道—淑浦—宁乡—浏阳一带存在一条元古宙的古板块消减带,它控制了湖南中北部地区大地构造的演化和发展。
The lava, gabbro-diabase and basaltic komatiite in Yiyang volcanic rocks possess similar or the same chemical composition and trace element contents as the lava, the dike complex and laverd cum-ulus crystal gabbro of the typlcol ophiolite suite respectively. They are of the property of ophiolite suite, and distribute along the same zone as those ophiolite suites of the adjacent Guangxi, Jiangxi and Anhui provinces. Hence it is considered that there exists a palaeo-plate subduction zone of Pro-terozoic era along a zone from Tongdao to Xupu, Ningxiang and Liuyang within Hunan province, which controlled the evolution and development af the geotectonics of northern and central Hunan.
出处
《湖南地质》
1992年第4期269-274,共6页
Hunan Geology
关键词
益阳
火山岩
形成
构造环境
Ophiolite suite
Palaeoplate subduction zone
Oceanic Crust
Yiyang
