摘要
本文对胶东区域与金矿有关的各主要地质体氧氢同位素组成背景进行研究，给出了燕山早期“玲珑”中粗粒二长花岗岩（滦家河型花岗岩）氧氢同位素背景值为δ￣（１８）Ｏ＝７．８‰，δＤ＝－№№‰；燕山晚期郭家岭（型）斑状花岗闪长岩背景值为δ￣（１８）Ｏ＝１０．‰，δＤ＝－９０‰；昆嵛山复式岩基背景值为δ￣（１８）Ｏ＝８．５‰，δＤ＝－９０‰。胶东群变质岩各岩性段δ￣（１８）Ｏ＝５．１－１１．３‰，δＤ＝－８１──９６‰，表明其源岩既有幔源中基性组分，又有壳源泥砂质物质。而郭家岭（型）斑状花岗闪长岩和中基性脉岩则很可能是该区域其它地质体重熔结晶分异的产物。
Hydrogen and oxygen isotopic composition of altered rocks and ore-forming fluidsproves to be one of the best indicators in the genetic study of hydrothermal deposits,and the determination of ini tial parameters of hydrogen and oxygen isotopes in theprocess of water-rock exchange seems to be of key importance, Based on an investigationinto hydrogen and oxygen isotopic composition backgrounds of major geological bodiesrelated to gold deposits in Jiaodong region, the present paper points out that the hydro-gen and oxygen isotope background values are δ￣(18)O=7.8‰ and δD=-110‰ for theEarly Yanshanian“Linglorig”medium-coarse grained adamellite(Luanjiahe type),δ￣(18)O=10.0‰ and δD=-90‰ for the Late Yanshanian Guojialing type porphyritic grano-diorite,δ￣(18)O=8.5‰ and δD=-90‰ for the Kunyushan complex granitic batholith,and δ￣(18)O=5.1-11.3‰ and δD=-81-96‰ for the metamorphic rocks of JiaodongGroup. These data show that the protoliths of the Jiaodong Group contained both mantle-derived intermediate-basic components and crust-derived argillaceous-arenaceous materials,whereas the Guojialing type granite and regional intermediate-basic dikes are likely pro-ducts of remelting and crystallization differentiation of other geological bodies in thisregion. Hydrogen and oxygen isotopic data of some subordinate rock bodies in this regionare also given in this paper.
出处
《岩石矿物学杂志》
CAS
CSCD
1995年第3期211-218,共8页
Acta Petrologica et Mineralogica
关键词
金矿床
成矿区
岩石
氧同位素
氢同位素
hydrogen and oxygen isotopic composition, geochemical background, Jiaodong(peninsula)
