摘要
伏牛山构造带由多条韧性剪切带组成,剪切带中广泛发育同构造变质流体形成的脉体。脉体矿物成分以石英为主,石英脉中石英晶体内发育大量的流体包裹体和气液相包裹体。包裹体成分以含中高盐度水溶液、低CO2、低δ18O～δD以及少量有机质为特征,包裹体的均一温度为170.6～337.8℃,白云母压力计计算出的压力为0.27～0.87 GPa。整个伏牛山构造带变质流体成分和同位素均继承了原岩海底火山喷发的地化特征。伏牛山构造带变质程度以绿片岩相为主,压力较大,具有俯冲带的特性。包裹体的特点均反映了宽坪岩块和二郎坪岩块依次向华北板块下俯冲、汇聚时产生了强变形,弱变质的构造作用。
The Funiu tectonic belt contains many shear zones in which syntectonic quartz veins are well developed. Mineral component of veins are mainly quartz and there are many fluid inclusions and gas liquid inclusion inclusions in them. The composition of inclusions is characteristic by medium to high salinity, low CO2 , low δ^18O～δD and a small amount of organic matter and with homogenization temperature of 170.6 ～ 337.8℃ and pressure of 0.27 ～ 0.87 GPa calculated by muscovite geobarometer. The result shows the metamorphic fluid component and isotopes are inherited from original rocks formed in submarine volcanic eruptions environment. The metamorphism of the Funiushan tectonic belt belongs to greenschist facies and the high pressure suggests the tectonic setting is a subduction zone. The characters of fluid inclusions reflected the Kuanping rock block and the Erlangping rock block subducted beneath the North China Plate in turn and generated strong deformation and weak metamorphism.
出处
《地质论评》
CAS
CSCD
北大核心
2013年第6期1068-1076,共9页
Geological Review
基金
国家自然科学基金资助项目(批准号41272213
41072161)
博士点基金资助项目的成果
关键词
秦岭
伏牛山构造带
石英脉
包裹体成分
同构造分异
the Funiu tectonic belt
quartz veins
composition of fluid inclusions
syntectonic differentiation
