摘要
在中国西天山伊什基里克山一带，发育有一系列橄榄辉长岩、橄长岩、辉长岩、辉绿岩床和岩墙群，同位素年龄为２７７～２９７ Ｍａ。其中哈拉达拉层状橄榄辉绿辉长岩－辉绿辉长岩体（又称大桥岩体）规模最大，约２５．５ ｋｍ２。根据近年来的实地研究，认为该岩体形成于伊犁盆地石炭一二叠纪裂谷带发育的构造背景之下，既有大量碱性玄武岩和火山碎屑岩，又有一定数量的基性—超基性杂岩和层状辉长岩侵入体，经历了稳定—亚稳定—稳定的演化史，有可能代表着裂陷达最大深度时的一次基性岩浆活动。
A series of basic magmatic activities developed during the late Carboniferous-early Permian along the Yishijilik mountain of the western Tianshan mountains in Tekes county, forming rougemontite, troctolite, gabbro, diabase sills and sheeted dykes which have an isotopic age of 277～297 Ma. The largest pluton called Kaladala Pluton or Daqiao pluton and it is about 25.5 square kilometers. Kaladala pluton is located in the southern margin of Ili basin, consisting of bedded olivine-diabase gabbroes diabase gabbroes. Few work has been done previously on this pluton. The field inveshgation demonstrates that this pluton was formed in a tectonic regime of Permian rifting of Ili basin. barge amount of alkaline basalts and vocaniclastic rocks were formed during the rifting, also accompanied by some basic-ultrabasic complexes and bedded gabbro plutons. The rifting developed from stable to sub-stable and back to stable stages. Kaladala pluton possibly represents one of the series of magmatic activities when rifting was up to the maximum depth.
出处
《新疆地质》
CAS
CSCD
2000年第3期258-263,共6页
Xinjiang Geology
关键词
西天山
层状基性岩体
构造背景
China
western Tianshan
Kaladala bedded basic pluton
tectonic setting
