六盘山地区下白垩统六盘山群李洼峡组叠层石特征及成因环境探讨  

LACUSTRINE STROMATOLITES FROM THE LOWER CRETACEOUS LIWAXIA FORMATION IN THE LIUPAN MOUNTAIN AREA

作　　者：钟福平[1,2] 钟建华[2,3] 由伟丰 边强 王金华[3] 王安东[3] 孟玮[3] 艾合买提江.阿不都热和曼 

机构地区：[1]河南理工大学安全科学与工程学院 [2]中国科学院广州地球化学研究所 [3]中国石油大学(华东)地球资源与信息学院 [4]中国石油化工股份有限公司石油勘探开发研究院 [5]95338部队1大队

出　　处：《地层学杂志》2014年第1期65-70,共6页Journal of Stratigraphy

基　　金：国家科技重大专项:大型油气田及煤层气开发(项目编号:2011ZX05040);国家重点基础研究发展计划项目(2006CB202406);中石化重点项目(编号YPH08107)资助

摘　　要：在六盘山地区下白垩统六盘山李洼峡组中发育了湖相丘状叠层石,通过对叠层石的特征和叠层石地球化学组分分析表明,研究区叠层石主要产于安静低能水体环境,而且对沉积物的捕捉和粘附作用不甚明显,生物膜的钙化和原地微生物引发的沉淀作用是主要成因。经分析,研究区叠层石的Sr/Ba值为12.36,CaO含量为45.56%,总体上,研究区叠层石形成于盐度高且温度较高、气候炎热、蒸发量大而且较为干旱的环境。Domal stromatolites are described from the lower Cretaceous Liwaxia Formation in the Liupan Mountain area, northwestern China. Based on sedimentological and geochemical analysis, it appears that these stromatolites were formed in a quiet and low-energy environment. Sediment trapping and binding does not appear to have played a key role in the formation of these stromatolites. Instead, biofilm calcifica- tion and autochthonous mineral precipitation facilitated by microorganism were important. The stromato- lites were formed in high salinity, high temperature, arid, and highly evaporitic environments

关 键 词：叠层石 藻礁 李洼峡组 下白垩统 六盘山地区 

分 类 号：P534.53[天文地球—古生物学与地层学]