松辽盆地白垩系营城组流纹岩中石泡构造类型、特征及成因  

Types,Characteristics and Genesis of Lithophysa in Rhyolite of Yingcheng Formation,Songliao Basin

作　　者：王加强[1] 刘万洙[1] 杨双玲[2] 王璞珺[1] 许中杰[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]大庆油田勘探开发研究院,黑龙江大庆163712

出　　处：《吉林大学学报（地球科学版）》2007年第6期1266-1271,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家"973"项目(2006CB701403)

摘　　要：通过大比例尺平面地质填图、剖面测量和显微组构分析,九台营城煤矿区流纹岩中石泡构造发育。根据成因、产状、宏观形态和显微特征,石泡构造可分为3类:膨润土中的独立石泡、层状流纹岩表面贴附的石泡和块状流纹岩内部的石泡。独立石泡大小不等,直径由几厘米至几十厘米,表面似葡萄状,平面上呈环带状分布于珍珠岩四周蚀变膨润土中,为富含挥发物质的岩浆遇水淬碎成球体,经结晶分异作用形成。层状流纹岩表面贴附的石泡,直径由几毫米至几厘米,表面形态与独立石泡相似,平面上呈环带状分布于独立石泡带外侧,形成机理与独立石泡相似,由于遇水量减少和岩浆喷发强度增大形成差别。块状流纹岩内部的石泡,直径由几毫米至几厘米,内部具多圈层结构,为含气液混合物的岩浆,气体逸出,液体中的矿物成分随温度下降,由外至内依次结晶形成。3类石泡赋存于喷溢相上部亚相,形成机理为等容降温、冷凝收缩。Large scale planar geological mapping, profiling survey and microfabric analyses proved that lithophysa structure was developed in rhyolite in Yingcheng coal mine area, Jiutai City. According to the genesis, occurrence, macro shape and microscopical characteristics, lithophysa was divided into three types：the independent lithophysa in bentonite,surface mounted lithophysa on stratiform rhyolite and interior lithophysa in the massive rhyolite. The diameter range of independent lithophysa is from a few centimeters to tens centimeters. Independent lithophysa is grape-like. Independent lithophysa distributed within the bentonite which altered from perlite. The crystallization differentiation of spheres which were formed by magma quenching into water generated the independent lithophysa. The diameter range of surface mounted lithophysa is from a few millimeters to a few centimeters. Surface mounted lithophysa is grape-like too. The surface mounted lithophysa distributed around the outer layer of the independent lithophysa in plane. Genesis mechanism of surface mounted lithophysa is the same as independent lithophysa. The diameter range of interior lithophysa is from a few millimeters to a few centimeters. Multi-rings structure was developed in the interior lithophysa. The mineral crystallization fractionation of gas-enriched magma from surface to inner releasing gas generated the interior lithophysa. These three types of lithophysa distribute in upper subfacies of effusive facies. The forming condition is condensing shrinkage in fixed volume.

关 键 词：松辽盆地 营城组 流纹岩 石泡构造 

分 类 号：P618.13[天文地球—矿床学]