摘要
为探究江西李公岭花岗闪长岩的成岩时代和成矿前景,对李公岭地区的花岗闪长岩及其中发育的隐爆角砾岩筒中的花岗闪长(斑)岩角砾岩块分别进行了锆石LA-ICP-MS U-Pb定年。测年结果表明,李公岭花岗闪长岩(150.6±1.1)Ma和隐爆角砾岩筒中的花岗闪长(斑)岩岩块(151.0±1.3)Ma基本为同时形成,时代为晚侏罗世。李公岭花岗闪长岩和李公岭角砾岩筒中的花岗闪长(斑)岩的形成时代与区内发育的阳储岭W-Mo矿的成岩成矿时代基本一致,以及隐爆角砾岩筒和周围的网脉状石英脉的存在,表明李公岭地区当时可能存在一个岩浆热液活动中心,且该热液活动可能与江南古陆东北缘燕山晚期大规模W-Mo成矿作用有关,暗示李公岭岩体周围具有较大的W-Mo找矿前景。
In order to understand the geochronology and mineral exploration prospecting of the granodiorite at Ligongling,zircon LA-ICP-MS U-Pb dating was conducted on the granodiorite and granodiorite（porphyry） breccias.The results show ages of 150.6 ± 1.1 Ma and 151.0 ± 1.3 Ma respectively,indicating that they were formed almost simultaneously in Late Jurassic.The dating results show that granodiorite at Ligongling and the granodiorite（porphyry） breccias in the Ligongling breccias pipe were formed almost contemporarily with the rock-forming and mineralization of the Yangchuling W-Mo deposit.Together with the existence of the cryptoexplosive breccia pipes and the stockwork quartz veins in the granodiorite around them,it is concluded that there was probably a magmatichydrothermal activity center in Ligongling area,and the hydrothermal activity may be related to the Yanshanian large-scale W-Mo mineralization in the northeast of Jiangnan massif.So,there may be W-Mo mineralization prospect around the cryptoexplosive breccia pipe and the Ligongling granodiorite.
作者
戴盼
吴胜华
宋世伟
项新葵
DAI Pan;WU Sheng-hua;SONG Shi-wei;XIANG Xin-kui(MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing I00037, China;No. 916 Geological Party, Jiangxi Bureau of Geology ＆ Mineral Exploration, Jiufiang 332100, Jiangxi, China)
出处
《世界地质》
CAS
2018年第2期409-422,共14页
World Geology
基金
国家自然科学基金项目(41430314
41303034)
中央级公益性科研院所基本科研业务费项目(K1617)联合资助
