气候变化领域集成服务门户(CCPortal): Age determination and sedimentology on profile Lz1020 from Lake Hoare, Antarctica

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DOI	https://doi.org/10.1594/PANGAEA.798405
	Age determination and sedimentology on profile Lz1020 from Lake Hoare, Antarctica
	Wagner; Bernd; Ortlepp; Sabrina; Doran; Peter T; Kenig; Fabien; Melles; Martin; Burkemper; Andy
发布日期	2012-11-07
数据集类型	dataset
英文简介	Up to 2.3 m long sediment sequences were recovered from the deepest part of Lake Hoare in Taylor Valley, southern Victoria Land, Antarctica. Sedimentological, biogeochemical, and mineralogical analyses revealed a high spatial variability of these parameters in Lake Hoare. Five distinct lithological units were recognized. Radiocarbon dating of bulk organic carbon samples from the sediment sequences yielded apparently too old ages and significant age reversals, which prevented the establishment of reliable age-depth models. However, cross correlation of the sedimentary characteristics with those of sediment records from neighbouring Lake Fryxell indicates that the lowermost two units of the Lake Hoare sediment sequences were probably deposited during the final phase of proglacial Lake Washburn, which occupied Taylor Valley during the late Pleistocene and early Holocene. High amounts of angular gravel and the absence of fine-grained material imply a complete desiccation with subaerial conditions in the Lake Hoare basin in the middle of the Holocene. The late Holocene (< c. 3300 calendar yr BP) is characterized by the establishment of environmental conditions similar to those existing today. A late Holocene desiccation event, such as proposed in former studies, is not indicated in the sediment sequences recovered.
空间范围	Latitude: -77.628760 * Longitude: 162.882230
时间范围	2003-01-01T00:00:00 - 2003-01-01T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215549
推荐引用方式 GB/T 7714	Wagner,Bernd,Ortlepp,et al. Age determination and sedimentology on profile Lz1020 from Lake Hoare, Antarctica.2012-11-07.https://doi.org/10.1594/PANGAEA.798405.