Arid
DOI10.1016/j.quascirev.2015.09.011
Timing and characteristics of Late Pleistocene and Holocene wetter periods in the Eastern Desert and Sinai of Egypt, based on C-14 dating and stable isotope analysis of spring tufa deposits
Hamdan, Mohamed A.1; Brook, George A.2
通讯作者Hamdan, Mohamed A.
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2015
卷号130页码:168-188
英文摘要

There is very little dated evidence on wet periods in the Eastern Desert and Sinai Peninsula of Egypt during the Late Pleistocene and Holocene. To obtain such information, we have studied the petrography, isotope geochemistry and AMS radiocarbon ages of mostly relict tufas deposited by springs draining perched ground water bodies in metamorphic and volcanic rocks. The tufas unconformably overly Precambrian basic igneous rocks (basalt, diabase and gabbro). As the ages of tufa carbonate are frequently older than the true ages of the deposits because of the incorporation of old, C-14-dead carbon, we have dated both the carbonate matrix and insoluble organic material of the tufas. These ages show that the tufas were largely formed during two broad time periods, the most recent from 12,058 to 6678 cal yr BP (African Humid Period), and the other from similar to 31,200-22,500 cal yr BP, with preferential growth during the coldest times of this period namely during Heinrich Events 2 and 3 (H2 and H3) and the Last Glacial Maximum (LGM). The time span between 19,000-9000 cal yr BP, including the YD and H1, appears to have been relatively more arid than the earlier LGM or H2 periods or the later Holocene. The Late Pleistocene tufas are depleted in O-18 relative to the Holocene tufas and were deposited at a lower temperature (similar to 14.0 degrees-20.8 degrees C vs. 18.4 degrees-23.4 degrees C). We believe that the Holocene tufas in the Sinai were formed by rainfall from the Mediterranean and those in the southern part of the Eastern Desert by African monsoon rainfall derived from the Red Sea-Gulf of Aden and Indian Ocean. In contrast, the moisture that fed the Late Pleistocene tufas, which are depleted in O-18 relative to Holocene deposits, and progressively depleted from north to south, was probably brought by the Westerlies from the Atlantic-Mediterranean Sea when the Westerly circulation was pushed southwards during the coldest periods of the Late Pleistocene. Periods of tufa deposition correlate with major documented paleoclimatic events in North Africa during the late Pleistocene and Holocene; such as the Nile floods, high sea level and the formation of sapropels in the Mediterranean. (C) 2015 Elsevier Ltd. All rights reserved.


英文关键词Egypt Eastern Desert Sinai Tufa Isotopes Pleistocene Holocene Paleoclimate
类型Article
语种英语
国家Egypt ; USA
收录类别SCI-E
WOS记录号WOS:000367020600011
WOS关键词RED-SEA MOUNTAINS ; WESTERN DESERT ; OXYGEN ISOTOPES ; KHARGA OASIS ; PLUVIAL EPISODES ; AFRICAN MONSOON ; FOSSIL AQUIFERS ; CLIMATE-CHANGE ; HUMID PERIOD ; AGE
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/190096
作者单位1.Cairo Univ, Fac Sci, Dept Geol, Cairo, Egypt;
2.Univ Georgia, Dept Geog, Athens, GA 30602 USA
推荐引用方式
GB/T 7714
Hamdan, Mohamed A.,Brook, George A.. Timing and characteristics of Late Pleistocene and Holocene wetter periods in the Eastern Desert and Sinai of Egypt, based on C-14 dating and stable isotope analysis of spring tufa deposits[J],2015,130:168-188.
APA Hamdan, Mohamed A.,&Brook, George A..(2015).Timing and characteristics of Late Pleistocene and Holocene wetter periods in the Eastern Desert and Sinai of Egypt, based on C-14 dating and stable isotope analysis of spring tufa deposits.QUATERNARY SCIENCE REVIEWS,130,168-188.
MLA Hamdan, Mohamed A.,et al."Timing and characteristics of Late Pleistocene and Holocene wetter periods in the Eastern Desert and Sinai of Egypt, based on C-14 dating and stable isotope analysis of spring tufa deposits".QUATERNARY SCIENCE REVIEWS 130(2015):168-188.
条目包含的文件
文件名称/大小 资源类型 版本类型 开放类型 使用许可
Timing and character(4965KB)期刊论文出版稿开放获取CC BY-NC-SA浏览
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Hamdan, Mohamed A.]的文章
[Brook, George A.]的文章
百度学术
百度学术中相似的文章
[Hamdan, Mohamed A.]的文章
[Brook, George A.]的文章
必应学术
必应学术中相似的文章
[Hamdan, Mohamed A.]的文章
[Brook, George A.]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Timing and characteristics of Late Pleistocene and Holocene wetter periods in the Eastern Desert and Sinai of Egypt, based on C-14 dating and stable isotope analysis of spring tufa deposits.pdf
格式: Adobe PDF
此文件暂不支持浏览

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。