摘要
通过对甘肃北山野马街-马鬃山构造带蛇绿岩及相关火山岩的系统研究表明:该构造带分布于勒巴泉-野马街-马鬃山一线,呈NW-NWW向带状展布.其南、北与变质基底呈构造接触,从西到东30km断续残存蛇绿混杂岩,包括蛇绿岩及相关岛弧、洋岛等火山岩.揭示了本区在震旦—寒武纪期间曾受到边缘活动带影响,由拉张裂谷体制向沟弧盆体系的活动大陆边缘体制转变,对确立该区震旦—寒武纪构造背景及演化有重要的大地构造意义.
System reserash through the ophiolite and related volcanic rocks in Gansu beishan yemajie-mazongshan structral belt that shows, This Structral belt distributed lines in Lebaquan-Yemajie-Mazongshan,show in NW-NWW trending zonal distribution, the south and north of this belt is tectonic contract with metamorphic basement,from west to east, there is interrupted residual ophiolite in 30 KM long, The melange including opiolite and volcanic rocks related to island arc and oceanic island,It reveals obvious impact with marginal activities in this area,change from the pull apart rift valley system to the system of activity continental marginal system in ditch arc and basin system..It is important tectonic significance to establish tectonic setting and evolution of sinian-canbrian in this area.
出处
《新疆地质》
CAS
CSCD
2008年第3期305-313,共9页
Xinjiang Geology
