期刊
GEOMORPHOLOGY
卷 106, 期 1-2, 页码 154-164出版社
ELSEVIER
DOI: 10.1016/j.geomorph.2008.09.018
关键词
Cave fill; Speleothem; Cave archaeology; Karst subsidence; U-Th dating; Chamber cave
资金
- Water Authority of Israel, the Israel Science Foundation [256/05]
- L.S.B. Leakey Foundation
- Irene Levi Sala CARE Archaeological Foundation
The Qesem karst system may serve as an example for aging chamber caves. It includes two caves which have undergone several stages of natural and human-induced deposition, as well as subsidence and collapse. Natural deposits include calcite speleothems, bedrock collapse debris, and clay fill. Karst dissolution and associated sagging and decomposition have operated since the initial cave formation. Inclined sediments are attributed to several processes, mostly dominated by gravitational sagging into underlying dissolution voids, affecting cave deposits and sometimes the host-rock. U-Th dating shows that speleothem deposition has been common during the mid-late Quaternary, but deposition sites shifted according to local conditions. The aging of caves occurs when they become totally filled by sediments and ultimately consumed by surface denudation, as documented in Qesem Cave. (C) 2008 Elsevier B.V. All rights reserved.
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