Biogenic Silica and Carbon 14 Age Dates from Lake Victoria Cruise V95 Cores
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title: Biogenic Silica and Carbon 14 Age Dates from Lake Victoria Cruise V95 Cores
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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. DeMaster, University of Minnesota Large Lakes Observatory, with funding from the US National Science Foundation IDEAL project.
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otherConstraints: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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supplementalInformation: Biogenic Silica analysis was done using a timed, wet extraction technique adapted from DeMaster, D.J. (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.
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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
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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.
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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
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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
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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
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Modified for compliance to NCEI Template v1.2.
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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)
