滇西景谷地区澜沧江沿岸早古生代构造片岩中石英脉的成因与变形  

Genesis and deformation of quartz veins in the Lower Paleozoic tectonic schists along the bank of Lancang River, Jinggu area, western Yunnan, China

作　　者：梁晓[1] 王根厚[1,2] 杨广全[1] 

机构地区：[1]中国地质大学,北京100083 [2]中国地震局地球物理研究所,北京100081

出　　处：《地质通报》2009年第9期1342-1349,共8页Geological Bulletin of China

基　　金：国家自然科学基金项目(编号:49802019)资助

摘　　要：滇西景谷县澜沧江沿岸出露的下古生界内发育一套构造片岩,空间上呈NNW—SSE向展布,岩性以绢云母石英构造片岩为主。岩石发生了强烈的塑性流变,大量发育有细脉状、透镜状的石英脉。石英脉的宏观与显微构造变形特征反映其为同构造分泌结晶脉,形成机制与韧性剪切带中物质的溶解、迁移、重结晶作用密切相关。石英原生气液包裹体显微测温实验表明,石英脉形成时的温压条件为:T=500℃,p=0.498GPa,反映构造片岩的变质程度达到了中、高绿片岩相。Along the Lancang River in Jinggu County, Yunnan Province, a series of Lower Paleozoic schists which are dominant by sericite and quartz tectonic schists distribute in NNW-SSE direction. The schists have undergone intensive rheology, and abundant lentoid and veinlet quartz veins are well developed. It′s indicated from both the macro and micro tectonic deformation structure that the quartz veins are syn-tectonic recrystallized, and the forming mechanism is closely related to mineral dissolution, transfer and recrys-tallization in ductile shear belts. On the basis of data from quartz inclusion experiments, these quartz veins were formed under the metamorphic condition of 500℃ and 0.498GPa, which is consistent with middle to high greenschist facies.

关 键 词：石英脉 变形 气液包裹体 韧性剪切带 澜沧江 滇西 

分 类 号：P534.4[天文地球—古生物学与地层学] P588.344[天文地球—地质学]