摘要
道孚蛇绿岩位于甘孜-理塘蛇绿岩带北东侧的炉霍-道孚构造带内,呈北北西-北西向断续分布,并严格受控于炉霍-道孚构造混杂岩带。通过不同岩石类型的蛇绿岩残片可以重塑蛇绿岩组合层序,恢复后的蛇绿岩层序由下至上为蚀变超基性岩、蛇纹石化辉石岩、蚀变辉长岩、基性熔岩及放射虫硅质岩。空间分布特征和岩石地球化学特征表明,蛇绿岩形成于有限扩张背景下的初始洋盆环境。
The Dawu ophiolite occurs in the Luhuo-Dawu tectonic zone on the northeast side of the Garze-Litang ophiolite zone, being exposed discontinuously NNW-NW-wards and being controlled by the Luhuo-Dawu tectonic melange zone. The ophiolite sequence reconstructed by the ophiolite relicts is altered ultrabasic rock, serpentinized pyroxenite, altered gabbro, basic lava and radiolarian silicalite in ascending order. The spatial distribution and petrogeochemistry indicate that the ophiolite was formed in an initial oceanic basin in a limited spreading setting.
出处
《四川地质学报》
2008年第3期255-261,共7页
Acta Geologica Sichuan
基金
中国地质调查局项目"1:25万炉霍幅
马尔康幅区域地质调查"
关键词
蛇绿岩
层序
地球化学
初始洋盆
四川道孚
ophiolite
sequence
geochemistry
initial oceanic basin
Dawu, Sichuan
