巴尔喀什-准噶尔地区地层及岩浆岩概述

巴尔喀什-准噶尔地区地层出露齐全,岩浆岩发育,太古-元古代以片岩、片麻岩、麻粒岩等变质岩系为主,为以1 230～1 100 Ma侵入的辉长-辉绿岩、花岗岩为代表的格林威尔造山事件结果,其后的里菲系多具盖层性质.文德系出露冰碛岩及碱性火山岩,象征古陆(罗丁尼亚古陆)解体;古生代地层可划分为稳定及活动型两种类型.前者为在稳定陆壳基底上的盖层,后者为古亚洲洋发展、演化至消亡全过程的不同沉积建造特征及建造组合;中-新生代地层代表陆内盆地发展、演化阶段的各类沉积.火山岩按时代分别作了介绍,总体特征是前寒武纪以偏碱性岩浆活动为主,古生代多为钙碱系列,后期发育舣峰式火山岩.中-新生代为大陆玄武岩、流纹岩岩流及部分碱性岩类.侵入岩共划分为5大侵入期,并按时代分别作了介绍.

SUMMARIZATION ABOUT STRATUM AND MAGMATIC ROCK IN BALKHASH-JUNGGAR AREA

In the area of Balkhash-Junggar, the stratum outcrop entirely; magmatic rocks are well developed; in the age of Archaeozoic-Proterozoic Era, The rock are mainly of metamorphic rock series.such as schists gneiss, granulite.etc. approximately in the age of 1230～1100 million years,instrusive rock of gabbro- diabase, granite represents the Grenville orogeny, thereafter leefian have much cover, Vendian outcrops moraine and alkline volcanic rocks, signify the old land's disintegration;Paleozoic stratum is divided into two types that are stable or active, the former is the cover of stable land crust base, the latter reflect the different sedimentary formation features and formation units of the whole process of the ancient asia ocean's develop、 evolvement,and then to death; Mesozoic-Cenozoic represents all kinds of sedimentery in land basin's develop、 evolvement process; Vocanic rocks are respectively summarized in age,the general characteristic are that in PreCambrian mostly is alkali lava movement, in Mesozoic is post develop two peak volcanic rocks in calcalkaline series; Mesozoic-Cenozoic are rock series of mainland basalt、 rhyolite and part of alkali rock; The age of intrusive rocks is diveded into five intrusive age. And respectively summarized based on age.