Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.palaeo.2008.12.002 |
Biogenic structures in exhumed surfaces around saline lakes: An example from Lake Bogoria, Kenya Rift Valley | |
Scott, Jennifer J.1; Renaut, Robin W.1; Buatois, Luis A.1; Owen, R. Bernhart2 | |
通讯作者 | Scott, Jennifer J. |
来源期刊 | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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ISSN | 0031-0182 |
出版年 | 2009 |
卷号 | 272期号:3-4页码:176-198 |
英文摘要 | Five overprinted suites of animal and plant traces around saline, alkaline Lake Bogoria, Kenya, are described from a set of interfingering Late Pleistocene and Holocene exhumed surfaces that reveal a complex story of changes in lake level and environmental controls on trace assemblages through time. These stratigraphic surfaces are amalgamated and form a co-planar surface. The sediments were first deposited during intermediate lake levels, then reworked and cemented during low lake levels, and were subsequently overlain by transgressive lacustrine sediments during higher lake levels. Ongoing exhumation of the surface near the present shoreline has reactivated the sediments as a substrate for the activities of epifaunal and infaunal animals, as well as plant growth. The modem environmental setting at Lake Bogoria is very similar to that of the preserved exhumed surfaces, which allows comparisons between observed sets of environmental factors affecting animal behaviour and their representation in the fossilized examples. Pronounced lateral environmental heterogeneity around saline and hypersaline lakes may lead to concentrations of life around sites with vital resources, such as freshwater. At Lake Bogoria, groups of fault-controlled hot springs represent these "oases", and have been a relatively consistent feature in and around the lake during the development of the exhumed surfaces. Together, the diverse assemblage of animal trace suites from Lake Bogoria represent the Mermia and Scoyenia ichnolfacies, but can be divided into five suites that reveal details of laterally heterogeneous sets of environmental factors, and are useful indicators of lake level, substrate moisture content. substrate cohesion, etc. Suite 1 comprises the traces of chironomid larvae (Diptera: Chironomidae) formed in subaqueous lacustrine settings. Suite 2 includes the traces of flamingos (Phoeniconaias minor and Phoenicopterus tuber) formed at the shoreline. Suite 3 compares well with the Mermia ichnofacies and comprises trails and burrow systems associated with relatively fresh, saturated to extremely shallow subaqueous substrates. Suite 4 is comparable to both the pre- and post-desiccation suites of the Scoyenia ichnofacies, is the most diverse suite at Lake Bogoria, and mainly comprises the burrows of beetles, earwigs, and their larvae as well as a diverse set of rhizoliths and vertebrate tracks. Suite 5 contains a moderately diverse set of traces attributed to termites and ants. (C) 2008 Elsevier B.V. All rights reserved. |
英文关键词 | Ichnofacies Cementation Springs Pleistocene Saline lakes Rifts |
类型 | Article |
语种 | 英语 |
国家 | Canada ; Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000264010000005 |
WOS关键词 | EAST-AFRICA ; ECOSPACE UTILIZATION ; WESTERN ARGENTINA ; TRACE FOSSILS ; ICHNOFACIES ; SEDIMENTS ; INVERTEBRATE ; DIPTERA ; BASIN ; CHIRONOMIDAE |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
WOS研究方向 | Physical Geography ; Geology ; Paleontology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/162131 |
作者单位 | 1.Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5E2, Canada; 2.Hong Kong Baptist Univ, Dept Geog, Kowloon, Hong Kong, Peoples R China |
推荐引用方式 GB/T 7714 | Scott, Jennifer J.,Renaut, Robin W.,Buatois, Luis A.,et al. Biogenic structures in exhumed surfaces around saline lakes: An example from Lake Bogoria, Kenya Rift Valley[J],2009,272(3-4):176-198. |
APA | Scott, Jennifer J.,Renaut, Robin W.,Buatois, Luis A.,&Owen, R. Bernhart.(2009).Biogenic structures in exhumed surfaces around saline lakes: An example from Lake Bogoria, Kenya Rift Valley.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,272(3-4),176-198. |
MLA | Scott, Jennifer J.,et al."Biogenic structures in exhumed surfaces around saline lakes: An example from Lake Bogoria, Kenya Rift Valley".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 272.3-4(2009):176-198. |
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