【摘要】 通过对海南琼西多金属矿区燕山期花岗岩类的主量元素、微量元素以及稀土元素的系统分析和综合研究,探讨岩体的成因、演化以及成矿专属性,研究区内主要岩浆岩的成矿专属性。研究结果表明:琼西地区多金属矿区燕山期主要的花岗岩类为黑云母花岗岩、花岗斑岩、花岗闪长岩及钾长花岗岩,属于准铝质—过铝质钙性—高钾钙碱性岩类;岩石稀土总量偏低,明显富集大离子亲石元素,亏损高场强元素;琼西地区多金属矿区花岗岩体经历了较高程度的结晶分异作用,其中花岗斑岩、钾长花岗岩属于S型花岗岩,而花岗闪长岩、黑云母花岗岩属于I型花岗岩;本区花岗闪长岩、黑云母花岗岩是区内寻找金矿床(化)的有利岩体,花岗斑岩为钼矿化母岩。更多还原

【Abstract】 Based on the analysis of the major elements, trace elements and rare earth elements of the Yanshanian granite in the west part of Hainan Province, the petro genesis and evolution of intrusion and metallogenic specialization were discussed. Based on the analysis of the geochemical characteristics, metallogenic specialization of the granitic rock was discussed. The results show that the major granitites are biotite-granite, granite porphyry, granodiorite and K-feldspar granite belonging to quasi-aluminous rock — Peraluminous calcic rock — high kalium calc alkalic rock. The rocks are enriched in large ion lithophile element and depleted in high field strength element, with relatively low rare earth elements contents. The rock body of polymetallic ore deposit in this area experiences a high degree of crystallization differentiation. Furthermore, granite porphyry and K-feldspar granite are S-type granite, while granodiorite and biotite-granite are I-type granite. The granodiorite, biotite-granite is the favorable rock for looking for gold deposits in the region, and granite porphyry is for molybdenum deposits in the region.更多还原