江西瑞金白垩纪火山岩盆地的发现及其找矿意义  

Discovery of Cretaceous volcanic basin in Ruijin of Jiangxi and its ore prospecting significance

作　　者：骆学全[1] 张勇[1] 沈莽庭[1] 湛龙[1] 张雪辉[1] 朱筱婷[1,2] 武玲[1] 

机构地区：[1]南京地质矿产研究所,江苏南京210016 [2]南京大学,江苏南京210093

出　　处：《地质学刊》2010年第4期367-371,共5页Journal of Geology

基　　金：中国地质调查局"江西省瑞金-会昌地区矿产远景调查"(矿调[2005]13-6;矿调[2006]13-6)

摘　　要：在开展武夷山地区战略性矿产远景调查时,首次发现了江西瑞金白垩纪盆地的火山岩。火山构造盆地具有断陷性质,形成于中生代区域隆升背景下的拉张构造环境。火山岩产于白垩纪盆地底部,主要为爆发相的集块岩、角砾岩、凝灰岩;成分为高硅低钾,属流纹质火山碎屑岩;87Sr/86Sr=0.73162,具有上地壳重熔岩浆的锶同位素组成。位于火山岩底层的角砾岩具有明显的硅化蚀变和金矿化,是区域内新发现的矿化层位,产于其中的金矿为火山岩层控类型,属于与燕山晚期中酸性岩浆活动有关的成矿系列,具有重要的区域成矿研究和找矿勘查意义。Volcanic rocks were discovered firstly in Ruijin Cretaceous basin in Jiangxi Province, when the prospect investigation of strategic resources in the Wuyi Mountain area was carried out. The volcano-tectonic basin with faulted characteristics formed in the rifted environment of Mesozoic regional uplift background, and the volcanic rocks were located at the bottom of the Cretaceous basin, mainly composed of eruption volcanic agglomerate, breccia and tuff, belonging to rhyolitic pyroclastic rocks with characteristics of high silicon and low potassium; The 87Sr/86Sr=0.731 62, was the same as the Sr isotope in the upper crust remelting magma. The breccia at the lower vocanic rocks with obvious silicated alteration and gold mineralization were the newly discovered regional mineralization layers. The gold mineralization was of volcanic stratabound type related to late Yanshanian acid-intermediate magmatic activities. The discovery of volcanic basin was of significantly importance for the metallogenic researches and exploration there.

关 键 词：火山岩盆地 含金建造 白垩纪 江西瑞金 

分 类 号：P588.14[天文地球—岩石学]