新甘交界红柳河地区早二叠世火山作用的环境响应  

Environmental response of Early Permian volcanism in Hongliuhe area on the border between Xinjiang and Gansu provinces.

作　　者：潘金花[1] 郭召杰[1] 刘畅[1] 张宇[1] 

机构地区：[1]北京大学造山带和地壳演化教育部重点实验室,地球与空间科学学院北京100871

出　　处：《岩石学报》2007年第7期1779-1784,共6页Acta Petrologica Sinica

基　　金：国家重点基础研究规划项目课题(2007CB411305和2001CB409804);国家自然科学基金项目(40572123)的资助.

摘　　要：新甘交界红柳河地区早二叠世玄武岩与灰岩互层,玄武岩局部发育为枕状,枕间充填灰岩。通过对剖面碳酸盐岩样品的全岩无机碳氧同位素研究发现,与玄武岩互层的层状灰岩的δ^(13)C 和δ^(18)O 平均值分别为3.2‰和-14.2‰,枕状玄武岩间的块状灰岩的δ^(13)C 和δ^(18)O 的平均值分别为-0.7‰和-18.2‰,即碳酸盐岩的碳氧同位素组成在火山快速爆发时期相对于火山活动间隙时期明显偏负。通过对层状灰岩和枕间灰岩碳氧同位素研究发现,海盆火山作用是环境变化的主要控制因素。The early Permian basalts in Hongliuhe area on the Border between Xinjiang and Gansu Provinces are interbedded with limestone, and a small amount of limestone are filled in the triangle gap of pillow basalts. The carbon and oxygen isotopic composition of carbonates in intermittent volcanic eruption period and rapid volcanic eruption period are significantly different, respectively, δ^13C and δ^18 O are 3.2‰ and - 14.2‰ in average in interbedded limestone which is partially positive, - 0.7‰ and - 14.2‰ in average in limestone among pillow basalts which is partially negative. The research of carbon and oxygen stable isotope shows that environment variation in the marine basin is influenced greatly by volcanic eruption.

关 键 词：碳同位素 火山作用 碳酸盐岩 早二叠世 环境响应 

分 类 号：P588.145[天文地球—岩石学] P597.2[天文地球—地质学]