Biogenic Silica and Carbon 14 Age Dates from Lake Victoria Cruise V95 Cores | spatialRepresentationInfo|
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DeMaster organisationName: Department of Marine, Earth and Atmospheric Sciences, North Carolina State University contactInfo: (CI_Contact) address: (CI_Address) deliveryPoint: 2800 Faucette Drive, Jordan Hall Campus Box 8208 city: Raleigh, NC postalCode: 27695-8208 electronicMailAddress: demaster@ncsu.edu onlineResource: (CI_OnlineResource) linkage: http://www.meas.ncsu.edu/ protocol: WWW:LINK-1.0-http--link applicationProfile: Web Browser name: http://www.meas.ncsu.edu/ description: Contributors web site function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) author citedResponsibleParty: (CI_ResponsibleParty) organisationName: NOAA National Centers for Environmental Information role: (CI_RoleCode) publisher presentationForm: (CI_PresentationFormCode) tableDigital series: (CI_Series) name: Marine Geology and Geophysics (MGG) issueIdentification: MGG 94075001 otherCitationDetails: DeMaster, David J. (1979), The Marine Budgets of Silica and 32Si. Ph. D. Thesis, Yale University. pp 246-264. Johnson, T. C., C. A. Scholz, M. R. Talbot, K. Kelts, R. D. Ricketts, G.Ngobi, K. Beuning, I. Ssemmanda and J. McGill, 1996. Late Pleistocene desiccation of Lake Victoria and rapid evolution of cichlid fishes.Science, v.273, p. 1091-1093...Beuning, K., K. Kelts and T. C. Johnson, in press. Paleohydrology of Lake Victoria, East Africa inferred from 18O/16O ratios in sediment cellulose. Geology.Johnson, T. C., Y. Chan, K. Beuning, K. Kelts, G. Ngobi and D. Verschuren, in press. Biogenic silica profiles in Holocene cores from Lake Victoria:implications for lake level history and initiation of the Victoria Nile. In: Lehman, J. T. (Editor), Environmental Change and Response in East African Lakes. Kluwer Press, Amsterdam.Verschuren, D., D. N. Edgington, H. J. Kling and T. C. Johnson, in press. The eutrophication of Lake Victoria: sedimentary signals at offshore stations. Journal of Gt. Lakes Research.Scholz, C. A., T. C. Johnson, P. Cattaneo, H. Malinga and S. Shana, in press. Initial results of 1995 IDEAL seismic reflection survey of LakeVictoria, Uganda and Tanzania. In: Lehman, J. T. (Editor), Environmental Change and Response in East African Lakes. Kluwer Press, Amsterdam.Data produced by: Large Lakes Observatory, University of Minnesota, Duluth, 213 Research Laboratory Building, 2205 East 5th Street, Duluth, MN 55812-2401email: tcj@d.umn.edu http://www.d.umn.edu/llo/ abstract: The LLO operates in conjunction with the Limnological Research Center (LRC) in working towards fulfilling the objectives of the International Decade for the East African Lakes (IDEAL) to study the East African Lakes. The Lake Victoria project is funded by NSF. Like Lake Victoria, extensive work is being continued on Lake Malawi, Lake Turkana, and Lake Edward. In addition to the East African lakes, the LLO is working on Lake Issyk Kul', Lake Nicaragua, and Lake Superior. Summary: The Biogenic Silica Data file contains data for 5 cores taken from various sites in Lake Victoria. The data include ship, coring date, water depth, latitude/longitude, sampling device, sampled interval, % biogenic silica, and 14C dates. Cores were sampled at 10 cm intervals for biogenic silica analysis. Samples taken for 14C dating were prepared at the LRC Laboratory and sent to an outside AMS Facility for analysis. Pollen, charcoal, and plant macrofossils were dated. Biogenic Silica analysis was done using a timed, wet extraction technique adapted from D. J. DeMaster (1979). The analysis was done using 0.5 M NaOH at 85 0C. purpose: paleoenvironmental studies credit: Dr. David J. 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(1979), The Marine Budgets of Silica and 32Si. Ph. D. Thesis, Yale University. pp 246-264. . The analysis was done using 0.5 M NaOH at 85 0C. return to top contentInfo: (MD_CoverageDescription) attributeDescription: RecordType: The Latitude and Longitude (point) from which a sample of sediment or rock was collected from the sea floor or a lakebed. contentType: (MD_CoverageContentTypeCode) point dimension: (MD_Band) sequenceIdentifier: MemberName: aName: Latitude attributeType: (unknown) descriptor: Distance measured north or south from the equator. Distance north is positive, distance south is negative. maxValue: Real: 90.00000 minValue: Real: -90.00000 units: UnitDefinition: identifier: decimal degrees name: decimal degrees dimension: (MD_Band) sequenceIdentifier: MemberName: aName: Longitude attributeType: (unknown) descriptor: Longitude is measured from the Prime Meridian (which is the north/south line that runs through Greenwich, England), values measured east are positive and values measured west are negative. maxValue: Real: 180.00000 minValue: Real: -180.00000 units: UnitDefinition: identifier: decimal degrees name: decimal degrees return to top contentInfo: (MD_FeatureCatalogueDescription) complianceCode: false includedWithDataset: true featureTypes: LocalName: featureCatalogueCitation: (CI_Citation) title: Documentation for the Biogenic Silica and Carbon 14 Age Dates from Lake Victoria Cruise V95 Cores dataset. date: (CI_Date) date: 1997-11-03 dateType: (CI_DateTypeCode) creation otherCitationDetails: Entities and attributes are completely described in a text file accompanying the dataset on download. return to top distributionInfo: (MD_Distribution) distributor: (MD_Distributor) distributorContact: (CI_ResponsibleParty) organisationName: NOAA National Centers for Environmental Information contactInfo: (CI_Contact) address: (CI_Address) electronicMailAddress: ncei.info@noaa.gov onlineResource: (CI_OnlineResource) linkage: https://www.ncei.noaa.gov/contact name: NCEI Contact Information description: Information for contacts at NCEI. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) distributor distributionOrderProcess: (MD_StandardOrderProcess) fees: In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. orderingInstructions: Contact NCEI for other distribution options and instructions. distributorFormat: (MD_Format) name: ASCII version: UTF-8 specification: American Standard Code for Information Interchange (ASCII) text format. distributorFormat: (MD_Format) name: tar.gz version: unknown specification: compressed Tape ARchive file distributorTransferOptions: (MD_DigitalTransferOptions) onLine: (CI_OnlineResource) linkage: https://data.noaa.gov/metaview/page?xml=NOAA/NESDIS/NGDC/MGG/Geology/iso/xml/G02885.xml&view=getDataView&header=none protocol: WWW:LINK-1.0-http--link applicationProfile: Web Browser name: Metadata Landing Page description: Information about the data set, all access options, and complete documentation. function: (CI_OnLineFunctionCode) information distributorTransferOptions: (MD_DigitalTransferOptions) onLine: (CI_OnlineResource) linkage: https://www.ngdc.noaa.gov/mgg/geology/data/g02885/ protocol: WWW:LINK-1.0-http--link applicationProfile: Web Browser name: Data files and documentation description: All originator's data and documentation. function: (CI_OnLineFunctionCode) download return to top dataQualityInfo: (DQ_DataQuality) scope: (DQ_Scope) level: (MD_ScopeCode) dataset extent: #boundingExtent levelDescription: (MD_ScopeDescription) dataset: gov.noaa.ngdc.mgg.geology:G02885 report: (DQ_AbsoluteExternalPositionalAccuracy) nameOfMeasure: Horizontal Positional Accuracy measureDescription: (unknown) evaluationMethodDescription: The horizontal accuracy of data values is approximately .001 degree of latitude/longitude. result: (unknown) report: (DQ_QuantitativeAttributeAccuracy) nameOfMeasure: Reliability measureDescription: (unknown) evaluationMethodDescription: Quality control was performed by the originator. NCEI performed basic out-of-range location testing. result: (unknown) lineage: (LI_Lineage) statement: lineage prior to transfer to NCEI is unknown. processStep: (LI_ProcessStep) description: Received data from originator dateTime: DateTime: 1977-11-03T00:00:00 source: (LI_Source) description: D.J. DeMaster, University of Minnesota, Large Lakes Observatory return to top dataQualityInfo: (DQ_DataQuality) scope: (DQ_Scope) level: (MD_ScopeCode) repository levelDescription: (MD_ScopeDescription) other: NOAA National Centers for Environmental Information lineage: (LI_Lineage) processStep: (LE_ProcessStep) description: NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. dateTime: DateTime: 2015-04-22T00:00:00 return to top metadataMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded maintenanceNote: Modified for compliance to NCEI Template v1.2. return to top acquisitionInformation: (MI_AcquisitionInformation) instrument: (MI_Instrument) identifier: (MD_Identifier) code: various type: (unknown) description: 5 cores, piston platform: (MI_Platform) identifier: (MD_Identifier) code: In Situ Ocean-based Platforms > SHIPS description: Various ocean-based and lake-based ships, boats, remotely operated vehicles, submersibles, and other unspecified types of platforms instrument: (inapplicable) |