CAJ | 학술논문

湘东南矿集区是南岭成矿带的重要组成部分。选取该矿集区内典型矿床的成矿花岗岩，利用成岩年龄、主量和微量元素组成、蛛网图及稀土元素配分模式等进行对比。结果表明：该矿集区内中生代成矿花岗岩的成岩年龄集中在150～165 Ma。根据地球化学组成可将该矿集区内的成矿花岗岩分为2类：一类以骑田岭为代表，岩性以黑云母二长花岗岩为主，属于 A型花岗岩，其分异程度较高，高w（Rb）/w（Sr）值，低w（K）/w（Rb）值，成矿元素以高温的 W、Sn为主，具有富硅，富碱，贫P、Ti、Mg的特点，Ba、Sr、P、Eu、Ti负异常明显；另一类以宝山岩体为代表，其岩体产状为小岩株，岩性以花岗闪长岩为主，属于 I 型花岗岩，分异程度较低，低w （Rb）/w （Sr）值，高w （K）/w（Rb）值，Ba、Sr、P、Eu、Ti负异常不明显，其地球化学性质与岛弧岩浆类似，成矿元素以中低温的Cu、Pb、Zn等为主。黄沙坪花岗岩的成矿特征处于第一类与第二类岩体之间，属于过渡类型。结合矿集区所在的大地构造位置及其构造演化史，认为湘东南矿集区的形成与壳幔相互作用密切相关，是后造山作用与大洋板块俯冲共同作用的结果。
상동남광집구시남령성광대적중요조성부분。선취해광집구내전형광상적성광화강암，이용성암년령、주량화미량원소조성、주망도급희토원소배분모식등진행대비。결과표명：해광집구내중생대성광화강암적성암년령집중재150～165 Ma。근거지구화학조성가장해광집구내적성광화강암분위2류：일류이기전령위대표，암성이흑운모이장화강암위주，속우 A형화강암，기분이정도교고，고w（Rb）/w（Sr）치，저w（K）/w（Rb）치，성광원소이고온적 W、Sn위주，구유부규，부감，빈P、Ti、Mg적특점，Ba、Sr、P、Eu、Ti부이상명현；령일류이보산암체위대표，기암체산상위소암주，암성이화강섬장암위주，속우 I 형화강암，분이정도교저，저w （Rb）/w （Sr）치，고w （K）/w（Rb）치，Ba、Sr、P、Eu、Ti부이상불명현，기지구화학성질여도호암장유사，성광원소이중저온적Cu、Pb、Zn등위주。황사평화강암적성광특정처우제일류여제이류암체지간，속우과도류형。결합광집구소재적대지구조위치급기구조연화사，인위상동남광집구적형성여각만상호작용밀절상관，시후조산작용여대양판괴부충공동작용적결과。
The ore concentration area in the southeastern Hunan is important for Nanling metallogenic belt.According to diagenetic age, composition of major-trace elements, spider diagrams and REE pattern,ore-related granites of typical deposit from the ore concentration area were selected and compared.The results show that the diagenetic ages of Mesozoic ore-related granites are mainly 150-165 Ma.According to the geochemical constituent,ore-related granites in the ore concentration area can be divided into two categories:firstly,the representative granite is Qitianling,lithology is mainly biotite adamellite,the plutons belong to A-type granite with high differentiation,w(Rb)/w(Sr)is high with low w(K)/w(Rb),metallogenic elements are mainly hyperthermal W and Sn,the characteristics are rich in SiO2 and alkali,and poor in P,Ti and Mg, and negative anomalies of Ba, Sr, P, Eu and Ti are significantly;for another one, the representative granite is Baoshan,the occurrence of pluton is small laccolith,lithology is mainly granodiorite,the plutons belong to I-type granite with low differentiation,w(Rb)/w(Sr)is low with high w (K)/w (Rb),negative anomalies of Ba,Sr,P,Eu and Ti are not obvious,the geochemical characteristics is similar to arc magma,and the metallogenic elements are mainly hypothermal Cu,Pb and Zn.The metallogenic characteristic of Huangshaping granite belong to the transitional type,which is between the above two kinds of ore-related granites.Combined with the tectonic background and history in the ore concentration area,the formation of ore concentration area in the southeastern Hunan is closely related to the mantle-crust interaction under the joint action of oceanic plate subduction and post-orogeny.