摘要
四川盆地东部嘉陵江组四段石盐岩中发育大量原生的单一液相包裹体,为揭示石盐结晶时古海水的温度,恢复早三叠世古气候提供了有利条件。本文在蒸发岩岩相学研究的基础上,对流体包裹体均一温度进行了测试。测温结果表明,石盐结晶时卤水的温度在17.7~63.5℃之间,与该地区碳酸盐岩氧同位素数据所反映的温度特征基本一致,说明早三叠世时海水具有较高的温度。这有利于古海水的强烈蒸发浓缩,为成钾奠定了良好的气候条件。
A large amount of primary fluid inclusions have been observed in the halite in the forth member of Jialingjiang Formation in the eastern Sichuan Basin,which facilitates to reveal the paleotemperature of the seawater and resume paleoclimate of the Early Triassic. In this paper, the homogenization temperature of fluid inclusions was tested with previous studies of fluid inclusion petrography. As the results shows,the paleotemperature of brine from 17. 7℃ to 63. 5℃ in the process of halite forming,and the maximum homogenization temperature（ 53. 7 ~ 63. 5℃） represent the maximum of the paleotemperature of brineand the homogenization temperature data are agreed with temperature reflected by oxygen isotopes data of marine carbonate rock in this region,which explained that the paleotemperature of seawater is very high at the Early Triassic period further more. It is conducive to the evaporation and concentration of the seawater,and was significantly favorable to the potash forming.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第9期2745-2750,共6页
Acta Petrologica Sinica
基金
国家重点基础研究计划"973"项目(2011CB403007)资助
关键词
均一温度
流体包裹体
古水温
四川盆地
早三叠世
Homogenization temperature
Fluid inclusions
Paleotemperature
Sichuan Basin
Early Triassic
