摘要
吉林延边开山屯低级变质作用发育于兴凯地块西南晚古生代活动大陆边缘,这里产出二叠纪末的消减增生杂岩。低级变质作用矿物除冻蓝闪石、阳起石、玉髓、黝帘石、多硅白云母、绿泥石、钠长石外,还在灰黑色变泥质岩中发现硬绿泥石+纤锰柱石+多硅白云母组合。这是国内首次报道的以泥质岩为原岩并具有硬绿泥石+纤锰柱石标志矿物组合的蓝片岩相岩石。研究表明,该组合的形成温度290.14(或370.8℃,具明显的低温特征。
Low-grade metamorphism developed in the latest Permian accretionary complex in the Kaishantun area, Yanbian, Jilin Province, is located at the late Paleozoic active continental margin of the Xingkai (Khanka) block. Besides barroisite, actinolite, chalcedony, zoisite, phengite, chlorite and albite, the low-grade metamorphic minerals also include the chloritoid + carpholite + phengite assemblages discovered in grayish black metapelites. This assemblage is China's first reported blueschist-facies rocks derived from pelites and having the chloritoid + carpholite index mineral assemblage. It shows the distinct low-temperature feature (T=290.14℃ or 370.8℃).
出处
《地质通报》
CAS
CSCD
北大核心
2003年第9期651-654,共4页
Geological Bulletin of China
基金
中国地质调查局基础地质综合研究项目(编号200113000052)成果之一。
