摘要
江西相山碎斑熔岩因其产状、岩石结构比较特殊,因此在岩石成因、岩相归属及岩体产状方面,长期以来存在多种不同看法。在控矿作用及找矿勘探方向看法上也有不同。作者通过多年野外地质、岩矿鉴定及矿床勘探资料的综合分析,从岩石学、岩石化学、地质产状上论证了相山岩体为一种介于火山与侵入之间的过渡性岩相—地下隐爆火山侵出相碎斑熔岩,具有一个主火山侵出通道和多个侧火山侵出通道的碎斑熔岩复式穹窿,其主、侧火山侵出通道机构及复式穹窿环锥状构造控制了矿田的格局及矿床和富矿体的生成部位。
This paper raises a question to the view, which is prevalent theoretically andpractically in the exploration of the Xiangshan ore field, that the Xiangshan orefield is controlled by 'the large collapse volcanic basin (caldera)' and 'the com-pounding site of the Neocathaysian fault and collapse volcanic structure'. Based onan integrated analysis of the data of field geological investigation, deep explorationand rocks and minerals, the author demonstrates in terms of petrology, petrochem-istry and occurrence that the Xiangshan rock body is a complex dome consistingof porphyroclastic lava of cryptoexplosiveviscous lava extrusion facies--a transitionfacies between the volcanic extrusion facies and the shallow intrusion facies andcontains a principal vocanic lava extrusion conduit and several lateral ones. Thusthe structural framework of the Xiangshan ore field and the loci of formation ofuranium deposits and oreshoots therein are controlled by the volcanic viscous lavaextrusion conduits and ring-cone fractures of the compound dome.
出处
《地质论评》
CAS
CSCD
北大核心
1993年第2期101-110,共10页
Geological Review
关键词
岩溶
成因
控矿作用
江西
complex porphyroclastic lava dome
viscous lava extrusion conduit
ring--cone fracture
Xiangshan in Jiangxi Province
