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Article: A SEM analysis of quartz grains in the sediments of the Lhasa karst areas, Tibet

TitleA SEM analysis of quartz grains in the sediments of the Lhasa karst areas, Tibet
Authors
Issue Date1996
PublisherBritish Cave Research Association.
Citation
Cave And Karst Science, 1996, v. 23 n. 1, p. 33-40 How to Cite?
AbstractThe quartz grains from the sediments of the Lhasa karst areas have been examined by scanning electron microscopy. As the quartz grains were chosen from newly-discovered sediments in caves and relict karst doline, the results show some differences from the sediments sampled by the author in 1987, which were examined by Bull and others (1990). The grains from cave alluvial deposits and doline sediments show many features that are only produced in high chemical and water energy environments. These include solution grooves, holes and V pits. The cave sediments were deposited in the Pleistocene, according to the U-series dating. The analysis, however, shows that the grains might come from the sediments of the Tertiary surface of the plateau, which were brought into the caves by water, mixed with fresh weathering materials and then redeposited. The destruction of this Tertiary surface by intensive erosion was induced by the fast uplift in the Quaternary. Alternatively, many features had also been modified in the chemically active periods during the Quaternary.
Persistent Identifierhttp://hdl.handle.net/10722/86285
ISSN
2015 SCImago Journal Rankings: 0.245
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, DDen_HK
dc.date.accessioned2010-09-06T09:15:01Z-
dc.date.available2010-09-06T09:15:01Z-
dc.date.issued1996en_HK
dc.identifier.citationCave And Karst Science, 1996, v. 23 n. 1, p. 33-40en_HK
dc.identifier.issn1356-191Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/86285-
dc.description.abstractThe quartz grains from the sediments of the Lhasa karst areas have been examined by scanning electron microscopy. As the quartz grains were chosen from newly-discovered sediments in caves and relict karst doline, the results show some differences from the sediments sampled by the author in 1987, which were examined by Bull and others (1990). The grains from cave alluvial deposits and doline sediments show many features that are only produced in high chemical and water energy environments. These include solution grooves, holes and V pits. The cave sediments were deposited in the Pleistocene, according to the U-series dating. The analysis, however, shows that the grains might come from the sediments of the Tertiary surface of the plateau, which were brought into the caves by water, mixed with fresh weathering materials and then redeposited. The destruction of this Tertiary surface by intensive erosion was induced by the fast uplift in the Quaternary. Alternatively, many features had also been modified in the chemically active periods during the Quaternary.en_HK
dc.languageengen_HK
dc.publisherBritish Cave Research Association.en_HK
dc.relation.ispartofCave and Karst Scienceen_HK
dc.titleA SEM analysis of quartz grains in the sediments of the Lhasa karst areas, Tibeten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1356-191X&volume=23&spage=33&epage=40&date=1996&atitle=A+SEM+analysis+of+quartz+grains+in+the+sediments+of+the+Lhasa+karst+areas,+Tibeten_HK
dc.identifier.emailZhang, DD:zhangd@hkucc.hku.hken_HK
dc.identifier.authorityZhang, DD=rp00649en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0030317159en_HK
dc.identifier.hkuros23134en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030317159&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume23en_HK
dc.identifier.issue1en_HK
dc.identifier.spage33en_HK
dc.identifier.epage40en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridZhang, DD=9732911600en_HK

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