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Article: Desiccation of late Quaternary inner shelf sediments: Microfabric observations
Title | Desiccation of late Quaternary inner shelf sediments: Microfabric observations |
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Authors | |
Issue Date | 2002 |
Publisher | Elsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/quaint |
Citation | Quaternary International, 2002, v. 92, p. 73-87 How to Cite? |
Abstract | Palaeo-desiccated crusts often form at the top of pre-Holocene shelf sediments during low sea-level stands resulting in significant changes in the mechanical properties. To assist in understanding these changes and the implications for Quaternary geology, the microfabric of sediment samples from the inner shelf off Hong Kong has been studied using scanning electron microscope techniques incorporating the latest methods of quantitative image analysis. These studies have been supported by petrographic observations and chemical analyses of the pore fluids. Holocene marine sediments usually have a honeycomb fabric while pre-Holocene marine sediments are more compact. In regions of high clay content, the palaco-desiccated crust often possesses large planar voids filled with coarse silt-sized particles. This desiccated crust often contains relics of root traces filled with pyrite showing varying degrees of oxidation. The release of amorphous iron acts as a cementation agent and binds large silt/small sand grains giving a more compact fabric than that in neighbouring regions. Cementation in the pre-Holocene marine deposits creates strengthened open-fabric arrangements which may initially withstand moderate loads. Further evidence of desiccation comes from the presence of halite crystals in the pore fluid which has salt concentrations below that of normal sea water. © 2002 Elsevier Science Ltd and INQUA. All rights reserved. |
Persistent Identifier | http://hdl.handle.net/10722/182409 |
ISSN | 2023 Impact Factor: 1.9 2023 SCImago Journal Rankings: 0.666 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Tovey, NK | en_US |
dc.contributor.author | Yim, WWS | en_US |
dc.date.accessioned | 2013-04-29T04:00:03Z | - |
dc.date.available | 2013-04-29T04:00:03Z | - |
dc.date.issued | 2002 | en_US |
dc.identifier.citation | Quaternary International, 2002, v. 92, p. 73-87 | en_US |
dc.identifier.issn | 1040-6182 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/182409 | - |
dc.description.abstract | Palaeo-desiccated crusts often form at the top of pre-Holocene shelf sediments during low sea-level stands resulting in significant changes in the mechanical properties. To assist in understanding these changes and the implications for Quaternary geology, the microfabric of sediment samples from the inner shelf off Hong Kong has been studied using scanning electron microscope techniques incorporating the latest methods of quantitative image analysis. These studies have been supported by petrographic observations and chemical analyses of the pore fluids. Holocene marine sediments usually have a honeycomb fabric while pre-Holocene marine sediments are more compact. In regions of high clay content, the palaco-desiccated crust often possesses large planar voids filled with coarse silt-sized particles. This desiccated crust often contains relics of root traces filled with pyrite showing varying degrees of oxidation. The release of amorphous iron acts as a cementation agent and binds large silt/small sand grains giving a more compact fabric than that in neighbouring regions. Cementation in the pre-Holocene marine deposits creates strengthened open-fabric arrangements which may initially withstand moderate loads. Further evidence of desiccation comes from the presence of halite crystals in the pore fluid which has salt concentrations below that of normal sea water. © 2002 Elsevier Science Ltd and INQUA. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Elsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/quaint | en_US |
dc.relation.ispartof | Quaternary International | en_US |
dc.title | Desiccation of late Quaternary inner shelf sediments: Microfabric observations | en_US |
dc.type | Article | en_US |
dc.identifier.email | Yim, WWS: wwsyim@hku.hk | en_US |
dc.identifier.authority | Yim, WWS=rp01746 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/S1040-6182(01)00116-1 | en_US |
dc.identifier.scopus | eid_2-s2.0-0036272074 | en_US |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-0036272074&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 92 | en_US |
dc.identifier.spage | 73 | en_US |
dc.identifier.epage | 87 | en_US |
dc.identifier.isi | WOS:000175741800007 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Tovey, NK=7003989574 | en_US |
dc.identifier.scopusauthorid | Yim, WWS=7007024728 | en_US |
dc.identifier.issnl | 1040-6182 | - |