辽西地区金矿床稳定同位素地球化学研究

STUDY ON THE STABLE ISOTOPIC GEOCHEMISTRY OF GOLD DEPOSITS IN WESTERN LIAONING

辽西地区金矿床Pb、S、H和0同位素研究表明,该区不同类型金矿床成矿物质主要来自下地壳或其与上地幔的混溶产物.成矿流体为金铜系列花岗岩岩浆水与显生宙大气降水的混合流体,或为与变质-混合岩化作用有关的早前寒武纪混合水.成矿物质来源老,成矿作用年龄新是该区不同类型金矿床的共同特征.综合研究Pb、S、H和O等同位素资料可以为正确划分金矿床成因类型和建立矿床模型提供重要依据,因此具有重要的理论和实用意义.

Study on the Pb, S, H, and O isotope has shown that the ore-forming substances of various types of gold deposits are mainly stemmed from lower crust or its mixture with upper mantle. The ore fluid is the mixture of granitic water (MCW) and phanerozoic meteoric water or the precambrian mixed water by metamorphism-migmatization. The common features of various types of gold deposits in this district are old in age of ore-forming substances and young in metallogenetic process. Comprehensive application of the isotopic information of the pb, S, H, and O may provide important evidence for classification of the genetic types of gold deposits and establish the genetic model of ore-deposits. This made the study important in theoretical significance and practtical utilization.