赣北中生代岩浆作用与钨成矿特征  

Mesozoic Magmatism and Tungsten Mineralization in Northern Jiangxi

作　　者：杨世文[1,2] 楼法生 丁沛勋[1] 张芳荣[1] YANG Shiwen;LOU Fasheng;DING Peixun;ZHANG Fangrong(Geological Survey Institute of Jiangxi Province,Nanchang 330030,Jiangxi,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,Jiangxi,China)

机构地区：[1]江西省地质调查研究院,江西南昌330030 [2]东华理工大学地球科学学院,江西南昌330013

出　　处：《中国钨业》2020年第5期53-60,共8页China Tungsten Industry

基　　金：江西省科学技术厅国家科技奖后备项目培育计划(20203AEI91004);江西省地勘基金项目(20200022);江西省地质调查研究院博士后科研基金;东华理工大学博士科研启动基金(DHBK2019060)

摘　　要：对赣北中生代岩浆作用与区内钨矿床最新科研成果进行梳理和总结,旨在深化该区中生代岩浆作用、钨成矿特征及两者之间联系的认识,并划分该区岩浆与成矿期次,为后期钨矿勘查提供资料。赣北钨矿化与高分异花岗岩关系密切,以S型花岗岩为主,存在三期与钨成矿作用有关的岩浆活动,晚侏罗世(160 Ma)、晚侏罗世-早白垩世(150~130 Ma)及晚白垩世(130~125 Ma)。赣北钨矿成矿分为四期,中侏罗世-晚侏罗世(165~160 Ma)、晚侏罗世(155~145 Ma)、晚侏罗-早白垩世(145~130 Ma)及早白垩世(130~120 Ma),自南东向北西,总体呈逐渐年轻化的趋势。赣北黑钨矿成矿流体主要来源于岩浆,而白钨矿成矿流体为岩浆与少量大气降水的混合,双桥山群变质围岩对成矿也有贡献作用。赣北白钨矿可能通过交代作用成矿,水-岩反应是白钨矿沉淀的主要机制,而黑钨矿可能是充填成矿作用形成,成矿作用受简单流体冷却或流体不混溶控制。The latest scientific research achievements of Mesozoic magmatism and tungsten ore in northern Jiangxi are reviewed and summarized for an in-depth understanding of Mesozoic magmatism,tungsten mineralization characteristics and the relationship between them.Tungsten mineralization in northern Jiangxi is closely related to highly differentiated granite.The origin of the rocks is mainly S-type granite,and there are three magmatic activities related to tungsten mineralization,including late Jurassic(160 Ma),Late Jurassic-Early Cretaceous(150~130 Ma)and late Cretaceous(130~125 Ma).The tungsten mineralization in northern Jiangxi can be divided into four stages:middle Jurassic-Late Jurassic(165~160 Ma),Late Jurassic(155~145 Ma),Late Jurassic-Early Cretaceous(145~130 Ma)and Early Cretaceous(130~120 Ma).From south to north,the mineralization trend is gradually getting younger.The ore-forming fluid of Wolframite in northern Jiangxi is mainly from magma,while the ore-forming fluid of scheelite is the mixture of magma and a small amount of meteoric water.The metamorphic surrounding rocks of Shuangqiaoshan group also contribute to the mineralization.Scheelite in northern Jiangxi may be mineralization through metasomatism,and water-rock reaction is the main mechanism of scheelite precipitation,while wolframite may be formed by filling mineralization,which is controlled by simple fluid cooling or fluid immiscibility.

关 键 词：赣北 中生代岩浆作用 成矿时代 流体来源 矿化机制 

分 类 号：TD164.2[矿业工程—矿山地质测量] TD11