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地质通报 2006

藏东碧土地区古特提斯主洋盆中的亚速尔型洋岛玄武岩

, PP. 772-781

吴根耀

Keywords: 亚速尔型洋岛碱性玄武岩岩石地球化学古特提斯主洋盆藏东碧土地区

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Abstract:

采自藏东碧土蛇绿混杂岩带的据水、学巴和登巴东3条剖面的火山岩样品，主体是碱性玄武岩。常量元素的判剐图解表明其构造背景是洋岛。微量元素含量显示出大洋板内玄武岩的特点。稀土元素配分型式表现为一组近于平行的右倾曲线，（Ce／Yb）。值约为6，稀土总量随岩浆分异程度的增高而增加。洋岛总体发育的时间为石炭纪（古特提斯洋盆的全盛期），属亚速尔型洋岛。其中，学巴剖面代表了洋岛形成的初期阶段，其下部有大洋拉斑玄武岩的夹层，稀土配分曲线和微量元素蛛网曲线均落入OIB与E―MORB之间；登巴东剖面则代表了洋岛火山岩发育的晚期阶段，顶部有酸性熔岩的夹层，火山岩之上连续沉积有灰岩和砂岩。对这3个亚速尔型洋岛的厘定，结合以前报道的夏威夷型洋岛（瓦浦火山岩），充分说明藏东的古特提斯主洋盆曾是一个开阔的多岛洋，与滇西南昌宁-孟连多岛洋的构造面貌相同。

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