检索结果-南通市图书馆

Benthic foraminifera as biostratigraphical and paleoecological indicators:An example from Oligo-Miocene deposits in the SW of Zagros basin,Iran

引用

Geoscience Frontiers 2016年第1期7卷 125-140页

作者： asghar roozpeykar iraj maghfouri moghaddam Department of Geology Faculty of SciencesUniversity of LorestanLorestanIran

The Asmari Formation is a predominantly carbonate lithostratigraphic unit that outcrops in the Zagros Basin. Micropaleontological studies of the Asmari Formation in the Dehdasht area led to the identification of 51 species of foraminifera taxa. Among the foraminifera, Nummulites cf. vascus, Operculin sp.,Operculina complanata, Eulepidina dilatata, Eulepidina elephantine, Ditrupa sp., Miogypsina sp., Elphidium sp. 14, and Borelis melo curdica are the most important. The Lepidocyclina-Operculina-Ditrupa assemblage zone represents the Rupeliane Chattian age. The Aquitanian age is also defined by co-occurrence of Miogypsina sp. and Elphidium sp. 14, and finally, the first occurrence of Borelis melo curdica represents the Burdigalian. Based on faunal assemblages, the following paleoenvironmental settings are determined for the deposition of the study section：（1） the deep, offshore settings in the aphotic zone dominated by pelagic and small benthic foraminifera;（2） the low energy, turbid and low light parts of the oligophotic zone characterized by large and flat lepidocyclinids（Eulepidina） and Nummulitidae;（3） the low turbidity,deeper part of the inner ramp dominated by Miogypsinoides, Neorotalia, Lepidocyclina, Operculina and Archias;（4） the shallow, marginal marine environment exposed to salinity fluctuations（short-term salinity fluctuations or fully marine conditions） dominated by small benthic Foraminifera（Ammonia and Elphidium）;（5） highly translucent, shallowest part of the inner ramp dominated by representatives of Borelis, Meandropsina and Peneroplis. The biotic assemblages represent warm tropical waters with oligotrophic to slightly mesotrophic conditions.

关键词： Biostratigraphy Asmari Formation Iran Oligo-Miocene Oligotrophy Mesotrophy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microbiostratigraphy and depositional environment of Eocene Shahbazan deposits at Chenareh section,southwest of Iran

引用

Global Geology 2015年第3期18卷 155-163页

作者： Azam Abdolnia iraj maghfouri Moghadam Department of Stratigraphy and Paleontology Shiraz Branch of Islamic Azad University Department of Geology Faculty of ScienceLorestan University

The Shahbazan Formation was deposited in the foreland basin in southwestern Iran( Lorestan Basin). In this research,microbiostratigraphy and depositional environmental implications related to the Shahbazan Formation at the northern flank of Chenaerh anticline are discussed. Carbonate sequences of the Shahbazan Formation consist mainly of large benthic foraminifera along with other skeletal and non-skeletal *** biozones have been recognized by distribution of large foraminifera in the studied area that indicate middle Eocene age( Lutetian). Based on analysis of large benthic foraminiferal assemblages and microfacies features,7 different microfacies have been recognized,which can be grouped into three depositional environments: inner,middle and outer ramps.

关键词： Shahbazan Formation Eocene Lorestan Basin biostratigraphy carbonate ramp environment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：