摘要
新疆阿尔泰山可可托海地区的片麻状黑云母花岗岩,似斑状花岗岩和二云母花岗岩分别是海西早期、海西晚期和印支—燕山期的产物。它们共有的岩相学特点是斑状或似斑状结构,片麻状构造,造岩矿物和副矿物保留有围岩矿物成分。CMF值和QAP图解以及亲合度提示了三种岩石在化学成分上是相互过渡的。微量元素、^(87)Sr/^(86)Sr以及铅和氧同位素组成,反映它们是陆壳重熔成因的。
Koktokay region, as a part of Altay Mountains, is a famous granite-pegmatite minergentic belt in China, where the granite-pegmatite is rich in elements Li, Be, Rb, Cs, Ta and Nb. There are three kinds of granites in this region, formed from crust-remelting magma in several orogenic periods. The granites contain accessory minerals in their replacement: microcline and acanthcomite, tourmaline, cordierite, silimanite, etc. Their chemical compositions, geochemical characteristics and similar REE patterns show the granites are derived from the same source at different stages of an evolutionary process. The ^(87)Sr/^(86)Sr ratio and δ^(18)O value also indicate the three kinds of granites having bean formed by crust-remelting.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第4期399-404,共6页
Acta Petrologica Sinica
关键词
花岗岩
岩石学
地球化学
成因
Granites
Petrology
Geochemistry
Remelting
