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U-Pb Dating of Zircons and Ore-bearing Potential of Zhulanbu Intrusions in the Southern Jiangxi Province
Author(s): ZENG Le, CHEN Zheng-hui, SUN Feng-yue, WANG Jia-huan, SUN Ying-chao, CHEN Zhen-yu
Pages: 199-
207
Year: 2016
Issue:
2
Journal: Rock and Mineral Analysis
Keyword: Nanling granite; Zhulanbu granite; LA-(MC)-ICPMS zircon U-Pb dating; Indosinian;
Abstract: 珠兰埠岩体是南岭地区大面积出露的岩体之一,也是缺少精确年龄数据的复杂岩体之一,在以往工作中被认为是燕山期早期岩体,此后相关研究较少,由于时代和方法的限制未见确切的同位素年龄数据发表.本文采用LA-(MC)-ICPMS锆石U-Pb法对珠兰埠复式岩体的粗粒斑状黑云母花岗岩、中细粒含斑黑云母花岗岩进行同位素年代学研究,探讨其成矿可能性.获得粗粒斑状黑云母花岗岩、中细粒含斑黑云母花岗岩等时线年龄分别为228.7±2.0 Ma和231.0±1.2 Ma,表明珠兰埠复式花岗岩体主体形成于印支期,而不是前人认为的燕山早期,由此修正了岩体成岩时代,同时结合珠兰埠岩体的地球化学特征与印支期花岗岩的成矿特点,较好印证了目前在该岩体及其周边,并未发现钨矿床的现象.本研究成果为赣南地区花岗岩研究提供了新的实例.
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