摘要
川西高原广泛分布的西康群 ,原视为区域低温动力变质作用低绿片岩相变质岩。近期通过 1∶5万区调 ,根据粘土矿物X粉晶测试及岩石显微结构鉴定等成果 ,将其归属于极低级变质岩。并认为区域极低级变质作用主要源于印支造山前的成岩 (埋藏 )变质作用。
Xikang Group is widely exposed on the West Sichuan Plateau and was considered to be a low greenschist facies metamorphic rock due to regional low-temperature dynamometamorphism.Recent 1:50,000 regional geological surveying indicates that it should belong to extremely weak metamorphic rock in terms of X-ray powder pattern of clay minerals and microtectonics. And the extremely weak regional metamorphism should be pre-Indosinian diagenic (burial)metamorphism.
出处
《四川地质学报》
2001年第2期65-69,共5页
Acta Geologica Sichuan
关键词
西康群
X粉晶测试
成岩变质作用
变质温度
压力
矿物
Xikang Group,X-ray powder pattern,extremely weak metamorphism,diagenic(burial)metamorphism
