Record Search Query:[Parameters: Topic='SOLID EARTH', Term='ROCKS/MINERALS', Variable_Level_1='AGE DETERMINATIONS']
Mapping and sampling of ice moulded bedrock, erratic boulders, moraines and calcite precipitates for exposure age dating using cosmogenic nuclides, from the Rennick Glacier area, north Victoria Land
Abstract:
A detailed assessment of the history of local ice dome and outlet glacier fluctuations in the Rennick Glacier area of north Victoria Land, which contains a record of global climate driven outlet glacier fluctuations, was undertaken to establish the extent and dynamics of late Cenozoic Antarctic ice sheet fluctuations in the region. In the lower Rennick Glacier area, moraines and ice eroded ... bedrock surfaces were mapped in the Morozumi Range to Helliwell Hills area. Ice-moulded bedrock and quartz-rich erratic boulders were sampled for exposure age dating using cosmogenic nuclides (CNs) (10Be and 26Al), Uranium series dating (U-Th/He) and apatite fission track dating. A number of sites in the Boggs Valley (Helliwell Hills) had subglacially precipitated calcite mantling ice moulded bedrock hummocks and samples were taken for exposure age dating (Uranium series dating) and oxygen and carbon isotopic analysis. In the upper Rennick Glacier region, mapping and CNs sampling efforts were carried out, specifically in the area between the Mesa Range and extending west to Lichen and Caudal Hills. The glacial landforms and ice abraded surface in the upper Rennick Glacier area was mapped. Sites with well preserved moraines and erratic boulders in stable positions suitable for dating using CNs were encountered and sampled in the Lichen, Vantage, Illusion and Caudal Hills, as well as the western side of the Mesa Range. The results from this study will help to determine the history of the east Antarctic ice sheet which is essential to the ongoing and crucial debate regarding the long term stability of the ice sheet and sensitivity of the ice sheets to climate change.
Quality
ATTRIBUTE ACCURACY REPORT: Limits of Detection Method Detection Limits (MDL), the lowest concentration of a parameter that an analytical procedure can reliably detect, have been established by the VIMS Nutrient Analytical Laboratory. The MDL is determined as 3 times the standard deviation of a minimum of 7 replicates of a single low ... concentration sample. Table 1 presents the current MDL's; these values are reviewed and revised periodically. Table 1. Method Detection Limits (MDL) for measured water quality parameters. Parameter Variable Method Detection Limit Dates in Use Ammonium NH4F 0.0015 mg/ L as N 2002-2003 Nitrite NO2F 0.0002 mg/ L as N 2002-2003 Orthophosphate PO4F 0.0006 mg/ L as P 2002-2003 Nitrite + Nitrate, filtered NO23F 0.0008 mg/ L as N 2002-2003 Chlorophyll a CHLA 0.5000 2002-2003 Phaeophytin PHEA 0.5000 2002-2003 Reporting of Missing Data and Data with Concentrations Lower than Method Detection Limits Nutrient/Chla comment codes and definitions are provided in the following table. Missing data are denoted by a blank cell and commented coded with an M. Laboratories in the NERRS System submit data that are censored at a lower detection rate limit, called the Method Detection Limit or MDL. MDL's for specific parameters are listed in the Laboratory Methods and Detection Limits Section (Section II, Part 12) of this document. Concentrations that are less than this limit are denoted by a 9999 and comment coded with a B; in the variable code comment column. For example, the measured concentration of NO23F was 0.0005 mg/L as N (MDL=0.0008), the reported value would be -9999 with a B placed in the NO23F comment code column. Calculated parameters are comment coded with a C and if any of the components used in the calculation are below the MDL, the calculated variable is denoted by 9999 and also comment coded with a B. If a calculated value is negative, the value is reported as a -9999. Nutrient/Chla Monitoring Program Flag Column Code: A = Value above upper limit of detection B = Value below method detection limit C = Calculated value D= Deleted data H = Sample held beyond specific holding time K = Check metadata for further information M = Data missing, sample never collected or calculated value could not be determined due to missing data P = Significant rainfall, 1.0cm occurred within 72 hours of sampling U= Lab analysis from unpreserved sample S = Data suspect, see metadata for further details QA/QC Programs. [This section describes field variability, laboratory variability, the use of inter-organizational splits, sample spikes, standards and cross calibration exercises.] . a) Precision: i) Field Variability True field replicates are taken at each site during grab sampling. The one replicate is a successive grab. Sample XXXXXX-G1 is taken and the sampler emptied. The grab sampler is deployed once again to acquire XXXXXX-G2. ii) Laboratory Variability none iii) Inter-organizational splits samples were not split or analyzed by two different labs b) Accuracy: i) Sample Spikes ;information unavailable ii) Standard Reference Material Analysis information unavailable iii) Cross Calibration Exercises DNERR did not participate in cross calibration exercises. LOGICAL CONSISTENCY REPORT: NACOMPLETENESS REPORT: Data collection period Diel Sampling Site Start Date Start Time End Date End Time SL 01/22/02 1015 1/23/2002 0845 SL 2/19/2002 0900 2/20/2002 1000 SL 02/25/02 1400 3/26/2002 1500 SL 4/17/2002 0800 4/18/2002 0900 SL 5/28/2002 1100 5/29/2002 1200 SL 6/24/2002 1400 6/25/2002 1500 SL No July Sample Taken SL 8/5/2002** 1130 8/6/2002 1230 SL 8/22/2002 0800 8/23/2002 0900 SL 9/19/2002 1100 9/20/2002 1200 SL 10/7/2002 0730 10/8/2002 0830 SL 11/12/2002 0900 11/13/2002 1000 SL 12/16/2002 1300 12/17/2002 1400 ** See Section 16 for further information Grab Sampling Site Start Date Start Time End Date End Time SL 1/7/2002 1113 1/7/2002 1117 SL 2/4/2002 0956 2/4/2002 1003 SL 3/7/2002 1116 3/7/2002 1119 SL 4/5/2002 0906 4/5/2002 0910 SL 5/6/2002 1042 5/6/2002 1050 SL 6/4/2002 1030 6/4/2002 1035 SL 7/2/2002 0908 7/2/2002 0913 SL No August Sample Taken SL 9/24/2002 0641 9/24/2002 0646 SL 10/29/2002 0938 10/29/2002 0942 SL 11/26/2002 0855 11/26/2002 0858 SL 12/10/2002 0836 12/10/2002 0841 Site Start Date Start Time End Date End Time LL 1/7/2002 1132 1/7/2002 1137 LL 2/4/2002 1033 2/4/2002 1038 LL 3/7/2002 1133 3/7/2002 1137 LL 4/5/2002 0926 4/5/2002 0929 LL 5/6/2002 1104 5/6/2002 1109 LL 6/4/2002 1051 6/4/2002 1055 LL 7/2/2002 0934 7/2/2002 0937 LL No August Sample Taken LL 9/24/2002 0703 9/24/2002 0706 LL 10/29/2002 0956 10/29/2002 0959 LL 11/26/2002 0907 11/26/2002 0910 LL 12/10/2002 0900 12/10/2002 0904 Site Start Date Start Time End Date End Time DS 1/7/2002 1045 1/7/2002 1049 DS 2/4/2002 1059 2/4/2002 1104 DS 3/7/2002 1154 3/7/2002 1158 DS 4/5/2002 0946 4/5/2002 0949 DS 5/6/2002 1128 5/6/2002 1133 DS 6/4/2002 1113 6/4/2002 1118 DS 7/2/2002 0959 7/2/2002 1003 DS No August Sample Taken DS 9/24/2002 0722 9/24/2002 0727 DS 10/29/2002 1016 10/29/2002 1020 DS 11/26/2002 0927 11/26/2002 0930 DS 12/10/2002 0917 12/10/2002 0922 Site Start Date Start Time End Date End Time BL 1/7/2002 1004 1/7/2002 1007 BL 2/4/2002 1223 2/4/2002 1226 BL 3/7/2002 1237 3/7/2002 1243 BL 4/5/2002 1038 4/5/2002 1041 BL 5/6/2002 1220 5/6/2002 1222 BL 6/4/2002 1212 6/4/2002 1218 BL 7/2/2002 1055 7/2/2002 1058 BL No August Sample Taken BL 9/24/2002 0812 9/24/2002 0814 BL 10/29/2002 1050 10/29/2002 1055 BL 11/26/2002 1020 11/26/2002 1023 BL 12/10/2002 1013 12/10/2002 1018 Site Start Date Start Time End Date End Time BB No January Sample Taken For This Site BB 2/4/2002 1245 2/4/2002 1255 BB 3/7/2002 1251 3/7/2002 1255 BB 4/5/2002 1049 4/5/2002 1052 BB 5/6/2002 1227 5/6/2002 1231 BB 6/4/2002 1231 6/4/2002 1233 BB 7/2/2002 1107 7/2/2002 1109 BB No August Sample Taken BB 9/24/2002 0821 9/24/2002 0824 BB 10/29/2002 1110 10/29/2002 1123 BB 11/26/2002 1032 11/26/2002 1035 BB 12/10/2002 1033 12/10/2002 1036 LINEAGE/PROCESS STEP: PROCESS DESCRIPTION: Additional Description: Entry verification Excel data files containing measured values received from the VIMS Analytical Laboratory are used to generate calculated parameter values. Both directly measured and calculated values were entered into this document by Michael G. Mensinger. Michael G. Mensinger is also responsible for a visual QA/QC to make sure no entry errors are present. The original Excel files received from VIMS are archived on the State of Delaware server. Edited files containing additional calculated parameters, are archived on the State of Delaware server and sent to the CDMO for additional archiving. PROCESS DATE: 20060223
Access Constraints
Data collected in conjunction with the National Estuarine Research Reserve System's (NERRS) System-wide Monitoring Program (SWMP) is considered public information. Please see site for further information: http://cdmo.baruch.sc.edu/aboutdata.htm LIABILITY: Distribution NOAA/ERD retains the right to analyze, synthesize and publish ... summaries of the NERRS System-wide Monitoring Program data. The PI retains the right to be fully credited for having collected and processed the data. Following academic courtesy standards, the PI and NERR site where the data were collected will be contacted and fully acknowledged in any subsequent publications in which any part of the data are used. Manuscripts resulting from this NOAA/OCRM supported research that are produced for publication in open literature, including refereed scientific journals, will acknowledge that the research was conducted under an award from the Estuarine Reserves Division, Office of Ocean and Coastal Resource Management, National Ocean Service, National Oceanic and Atmospheric Administration. The data set enclosed within this package/transmission is only as good as the quality assurance and quality control procedures outlined by the enclosed metadata reporting statement. The user bears all responsibility for its subsequent use/misuse in any further analyses or comparisons. The Federal government does not assume liability to the Recipient or third persons, nor will the Federal government reimburse or indemnify the Recipient for its liability due to any losses resulting in any way from the use of this data. NERR water quality data and metadata can be obtained from the Research Coordinator at the individual NERR site (please see Section 1. Principal investigators and contact persons), from the Data Manager at the Centralized Data Management Office (please see personnel directory under the general information link on the CDMO home page) and online at the CDMO home page http://cdmo.baruch.sc.edu/. Data are available in text tab-delimited format, Microsoft Excel spreadsheet format and comma-delimited format.
Use Constraints
The principal investigator (PI) listed in the enclosed metadata retains the right to be fully credited for having collected and processed the data. Please see the site for further information: http://cdmo.baruch.sc.edu/aboutdata.htm
