赣南大埠复式花岗岩体两期成岩年龄及其地质意义  

Two petrogenetic stages of Dabu composite granite pluton in South Jiangxi and their geological implications

作　　者：方贵聪[1,2] 陈郑辉[1] 陈毓川[3] 赵正[1] 侯可军[1] 曾载淋[4] 罗泽 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037 [2]广西隐伏金属矿产勘查重点实验室桂林理工大学地科学学院,广西桂林541004 [3]中国地质科学院,北京100037 [4]江西省地质矿产勘查开发局赣南地质调查大队,江西赣州341000

出　　处：《矿床地质》2017年第6期1415-1424,共10页Mineral Deposits

基　　金：国家重点研发计划课题(编号:2016YFC0600208);广西自然科学基金青年基金(编号:2015GXNSFBA139205);广西隐伏金属矿产勘查重点实验室系统研究课题资助(课题编号16-140-27-03)联合资助

摘　　要：大埠复式花岗岩体位于赣南腹地,是于都-赣县钨多金属矿集区的重要组成部分,其成岩期次及成岩成矿关系尚不十分清楚。文章采用LA-ICP-MS锆石U-Pb法测定了该岩体的成岩时代,结果表明:其东南体似斑状黑云母花岗岩年龄为(430.0±1.1)Ma,西北体斑状黑云母二长花岗岩年龄为(152.7±1.1)Ma。东南体虽对内外接触带铀矿的矿质来源有所贡献,但与西北体形成时代相差甚远,并非同一地质构造背景下的产物;西北体与内外接触带的钨矿床形成时代相近,成因联系密切。矿集区内岩浆活动具多旋回特征,以燕山早期尤其是158~153 Ma的花岗岩浆活动对钨多金属成矿作用最为有利。The Dabu composite granitic pluton, located in the heartland of South Jiangxi Province, is an important part of the Yu-Ganxian W-polymetallic ore concentration area. It was dated in this paper by means of the Laser AblationMulticollector Inductively Coupled Plasma-Mass Spectrometry（ LA-ICP-MS） method, and the result shows that it has experienced two stages of magmatic activity. The emplacement of its southeastern unit（ porphyry-like biotite granite） and northwestern unit（ porphyry biotite granite monzogranite） occurred at（ 430. 0 ± 1. 1） Ma and（ 152. 7± 1. 1） Ma, respectively. The former was produced in the geological structural background different from its neighbouring uranium deposits, although it supplied them with a certain amount of mineral source. The latter formed in the same geological background as its endocontact and exocontact tungsten-polymetallic deposits, and is genetically associated with them. Three magmatic cycles have been recognized in Yudu-Ganxian area, with the granitic magmatism in the period of 158 ~ 153 Ma being the most favorable magmatism for tungsten-polymetallic mineralization.

关 键 词：地球化学 地质年代学 锆石U-PB年龄 大埠花岗岩体 于都-赣县矿集区 赣南 

分 类 号：P597.3[天文地球—地球化学] P618.67[天文地球—地质学]