内蒙古呼鲁斯太地区早元古代花岗岩的地质特征及成因

GEOLOGIC FEATURES AND GENESIS OF THEGRANITE IN THE EARLY PROTEROZOIC ERAOF THE HULUSTAI AREA, NEI MONGGOL

内蒙古阿拉善左旗呼鲁斯太地区出露的太古代贺兰山群变质岩中分布有大量早元古代花岗岩．过去将这些花岗岩一直认为是混合花岗岩，笔者通过１：５万区调研究认为这些花岗岩属于岩浆成因，并按花岗岩类岩石谱系单位划分方案建立７个单元，将其中５个单元并为两个超单元。本文通过岩体地质、岩石学、矿物学、岩石化学和地球化学等方面论述了花岗岩的成因，并进一步探讨了花岗岩的成因类型、岩浆起源和源岩物质成分等问题。

A large number of granites of the early Proterozoic Era were distributed all over the Huolanshan Groupin the Hulustai, Alashan Left Banner, Net Monggol. Through the study of 1: 50000 regional geological survey f the auther considered that these granites were originated from the magma and he established 7 units, 5of which were incorporated into 2 super units according to the lithogenetic unit system of granitoid. In this paper I the author also discussed the genesis and went further into the petrogenetic types, the origin of magmaand the composition of some source rocks of granites through the geological characteristics of intrusive bodies, petrology, mineralogy, petrochemistry, geochemistry and so on.