摘要
为了进一步了解玛湖凹陷下二叠统风城组沉积环境,通过现代碱湖和主要碱矿进行调研,系统梳理了现代碱湖沉积特征,并与风城组沉积特征进行了对比研究,提出了现代碱湖沉积对玛湖凹陷风城组沉积环境具有可对比性。研究结果表明:玛湖凹陷风城组沉积期为一大型碱湖盆地,与世界上典型碱湖特征基本相近,自生矿物、沉积组合与演化过程大致相同,为形成于半干旱气候环境的闭流盆地,含碱层段一般为浅水环境成因,是碳酸盐型湖水蒸发浓缩的产物,与碱层互层的暗色细粒岩石不全为深水沉积产物。
The sedimentary characteristics of modern alkaline lakes and major alkaline deposits were systematically examined as a means of investigating the sedimentary environment of the lower Permian Fengcheng Formation in the Mahu Depression,then compared with the sedimentary characteristics of the formation.The results showed that the formation had its origins in a large alkaline lake basin with properties similar to those of typical modern alkaline lakes in various parts of the world,that is,having similar authigenic minerals,sedimentary assemblages and evolutionary processes.The Fengcheng Formation was a closed basin structure formed in a semi-arid climatic environment.The al⁃kali-bearing strata,which were generally formed in shallow water,are the products of evaporation and concentration of carbonated lake water,with dark,fine⁃grained interbeds in the alkaline layer.
作者
王力宝
厚刚福
卞保力
李亚哲
窦洋
尤新才
郭华军
徐洋
邹志文
WANG LiBao;HOU GangFu;BIAN BaoLi;LI YaZhe;DOU Yang;YOU XinCai;GUO HuaJun;XU Yang;ZOU ZhiWen(PetroChina Hangzhou Research institute of Geology,Hangzhou 310023,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)
出处
《沉积学报》
CAS
CSCD
北大核心
2020年第5期913-922,共10页
Acta Sedimentologica Sinica
基金
国家科技重大专项(2017ZX05001⁃002,2017ZX05001⁃004)
中国石油科技重大专项(2017E⁃0401,2019B⁃0309)。
关键词
准噶尔盆地
玛湖凹陷
二叠系
风城组
碱湖
Junggar Basin
Mahu Depression
Permian
Fengcheng Formation
alkaline lake
