橄榄石标型特征及其找矿意义

TYPOMORPHIC CHARACTERISTICS OF OLIVINES AND THEIR GEOLOGIC IMPLICATIONS IN SEARCHING FOR MAJOR ORE-BEARING BASIC AND ULTRABASIC INTRUSIONS IN CHINA

通过国内２０个含铬铁矿、铜镍矿和饥钛磁铁矿的基性、超基性岩体中６８个橄榄石化学成分、产出状态、地球化学特征、有序度和岩浆包裹体橄榄石子矿物、温度、压力等标型特征研究显示，产于不同矿化基性、超基性岩中橄榄石的标型特征明显不同，为找寻铬铁矿、铜镍矿和钒钛磁铁矿矿产提供重要标志。

This paper presents a systematic research into olivines in their compositions and varieties, occurrence and genetic types, preferred orientation and slip system, degree of order and mineralization, inclusions and their daughter minerals, which are from 20 chromite, copper-nickle-and vanadic-titanic magnetite-bearing basic and ultrabasic intrusions. It is discovered that olivines are polygenetic of which derived from forsterite, cumulative chrysolite and Fe-rich chrysolite-hyalosiderlte respectively with chromite, copper-nickle and vanadic-titanic magnetite mineralizations. In some intrusions or intrusive areas, the major composition(Fe), degree of order, preferred orientation as well as slip system of olivines varies regularly with their occurrences, rocks, inclusions, daughter minerals and mineraliation degree. This paper provides infomation on mineraliation and geologic condition researches; and it is helpful for evaluating and enlarging the prospect.