摘要
在寒武系等沉积岩广布、区内尚未发现岩浆岩分布的黔东地区,首次发现了特征较为典型的铜仁枫木寨隐爆角砾岩筒。该岩筒平面上呈椭圆形分布,长约220m、宽约100m。从内向外,分带特征十分明显,隐爆中心带、流化角砾岩带、震裂岩带和过渡带4带发育齐全,构成了一个较为完整的隐爆角砾岩筒系统。角砾的成分、形状、大小、胶结物及其位移特征与各带在隐爆过程中的受力规律吻合。同时,角砾成分复杂,既有来自围岩,又有来自下伏地层和更深的深部气液早期冷凝结晶的石英角砾和上覆地层坍塌的层纹状白云岩角砾。该岩筒的发现,对于研究该地区地质构造演化、成岩成矿作用,特别是指导金刚石原生矿(含金刚石的钾镁煌斑岩体或金伯利岩体)和隐爆角砾岩型贵金属矿找矿,具有重要意义。
Recently, characterized Fengmuzhai concealed eruption breccia pipe was firstly discovered in Tongren, East Guizhou Province, where the sedimentary rocks such as Cambrian system distrubte wide spread and ignous rocks have not yet been discovered. This breccia pipe appears approximate oblong in the plane, with the length of 220 m and the width of 100 m. The zoning feature is obvious, it could be divided into four belts from the core to the edge of the pipe, namely, the core belt of concealed eruption, the fluid- ization breccia belt, the crack breccia belt and the transition belt, which formed a whole concealed eruption breccia pipe system. The component, shape, size, cement and the displacement feature of the breccia coin- cide with the forced law of each belt in the process of the concealed eruption. Meanwhile, the components of breccia are complex. Some of them come from the country rock, and some are the quartz breccia which early and crystalized from the condensate fluids and gases in the underlying strata or the more deeper stra- ta, or some are lamellar dolomite breccia which collapseed from the overlying strata. The discovery of this pipe will be significant for the study of geotectonic evolution, rock formation and mineralization, especially for the searching of protogenesis diamond （diamond-bearing lamproite or kimberlite） and concealed erup- tion breccia type noble metal prospecting.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第1期94-98,共5页
Geological Science and Technology Information
基金
中国地质大学(武汉)本科生自主创新研究基金项目(1210491A02)
关键词
隐爆角砾
岩筒
贵州铜仁
concealed eruption breccia
rock pipe
Guizhou Province
