摘要
围绕东天山找矿的基础地质构造问题,编制了新的1:50万东天山地区大地构造图和1:100万东天山地区成矿规律图划分出新的大地构造单元,确认了中天山结晶轴的存在。将东天山地区显生宙以来的大地构造演化划分为洋壳扩张、俯冲岛弧、弧后盆地和碰撞造山期及造山期后伸展5个阶段,各阶段分别形成了对应的矿床和矿床组合明确了主要矿床如土屋铜矿(泥盆纪—早石炭世增生弧背景)、黄山—香山铜镍矿(早二叠世同碰撞背景)
Eastern Tianshan is one of the most important Cu-Ni-Au metallogenic provinces in China. Focusing on the major tectonic geology and exploration problems, we compiled the latest tectonic map in 1 :500,000 scale and metallogenic map in 1 : 1,000,000 scale of Eastern Tianshan Mountains. The existence of the Middle-Tianshan crystalline axis of Pre-Cambrian was further confirmed. We distinguished some new tectonic units such as the Dananhu-Tousuquan island arc at the north, and Aqishan-Yamansu back-arc basin at the south rather than the previous recognized Aqishan-yamansu island arc. The tectonic evolution of Eastern Tianshan in Paleozoic can be divided into five stages ,i.e. oceanic spreading stage, subduction-accretionary stage, back-arc spreading stage, collisional orogenic stage and post-collisional extension stage. While special ore deposits and their association corresponding to each evolution stage were formed. The ore-forming age of Tuwu-Yandong porphyry Cu deposits are Early Carboniferous in accretionary arc selling, while Huangshan-Xiangshan mafic-ultramafic Cu-Ni deposits are formed in Early Permian in syn- or early post-collisionul settings. Some controversy reminded to further approach is also suggested.
出处
《新疆地质》
CAS
CSCD
2002年第4期302-308,共7页
Xinjiang Geology
基金
中国地质调查局国土资源大调查项目(DK9902043)
国家自然科学基金项目(40072028)和国家"305"项目共同资助
关键词
东天山地区
古生代
构造演化
岛弧
弧后盆地
成矿环境
成矿作用
成矿时代
Accretionary arc
Back-arc basin
Ductile shear zone
Paleozoic tectonic evolution
Metallogenic settings
Eastern Tianshan
