摘要
依据成矿作用与板块构造-岩浆的时空演化关系，研究了不同构造-岩浆带内的矿床类型及其组合与矿床的稳定同位素组成特征，将中国东南部中生代大陆边缘的主要矿床分成陆缘火山（岩浆）-热液、陆缘弧后（间）火山-沉积与热液、亲弧张裂构造内的岩浆-热液、陆内裂陷火山（岩浆）-热液和古地热水环流热液五个成矿系列；并建立了俯冲体制下的大陆边缘成矿体系和成矿模式。
On the basis of the type and association of Mesozoic volcanic and intrusive rocks as well astheir geochemical characters, the Mesozoic continental margin in Southeastern China is dividedinto contiental margin volcanic (magmatic) arc, continental margin back-arc and interarc volcanicbasin belt and rifting volcanic (magmatic) belt, And more, according to the temporal and spatialevolutionary relationship between the plate tectonic-magmatism and the mineralization, as wellas the geological and the geochemical characteristics of the deposits in this area, the deposit typesand their association characteristics in different tectonic-magmatic belts are studied and the deposits of Mesozoic continental margin are divided into 5 minerogenetic series: volcanic(magmatic) -hydrotherman ore deposits in continental magin (Ⅰ), volcanic -sedimentary andhydrothermal deposits in the back-arc (Ⅱ), magmatic - h ydrothermal deposits in tens lie tee tonics related to the arc minerogenetic series (Ⅲ), volcanic (magmatic)- hydrothermal deposits incontinental interior rifting (Ⅳ) and hydrothermal deposits associated with circulating paleogeothermal water(Ⅴ ). The stable isotopic geochemical characteristics of the deposits of these series are as follows:For the porphyry type and subvolcanic rock type deposit in series Ⅰ and Ⅱ and the phophyry-sham type and stratabound type (sea floor volcanic eruptive sedimentary - hydrothermalreformation type) deposit in series Ⅳ, their H and O isotopic composition are rather similar andvary greatly, and their mineralizing fluid is the mixture of magmatic water and meteoric water,and it is mainly the magmatic water in the early stage and mainly the meteoric water in the latterstagel their S isotopic composition is mainly of a positive value (the δ34S values of porphyry typedeposits close to the zero value with a least variation). And more the variation area of Ph isotopiccomposition in Ph tectonic model diagram is mainly between the curve of upper mantle and orogenie belt, which shows that
出处
《地质找矿论丛》
CAS
CSCD
1997年第2期35-49,共15页
Contributions to Geology and Mineral Resources Research
关键词
成矿体系
成矿模式
大陆边缘
中生代
ore-forming system
minerogenetic model
continental margin
Mesozoic Era
Southeast China
