投稿时间：2016-10-19
修订日期：2017-09-13
网络发布日期：2017-12-28
中文摘要: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。
Abstract: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 Ablation-Multicollector 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.
keywords:geochemistry geochronology zircon U-Pb age Dabu granitic pluton Yu-Ganxian ore concentration area South Jiangxi
文章编号：
中图分类号：P597.3;P618.67
文献标志码：
基金项目: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
引用文本：
方贵聪,陈郑辉,陈毓川,赵正,侯可军,曾载淋,罗泽.2017.赣南大埠复式花岗岩体两期成岩年龄及其地质意义[J].矿床地质,36(6):1415~1424FANG GuiCong,CHEN ZhengHui,CHEN YuChuan,ZHAO Zheng,HOU KeJun,ZENG ZaiLin,LUO Ze.2017.Two petrogenetic stages of Dabu composite granite pluton in South Jiangxi and their geological implications[J].Mineral Deposits36(6):1415~1424
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