Florida Bay core logs disposition and analysis parameters

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Charles W. Holmes

Publication_Date: Unpublished material

Title: Florida Bay core logs disposition and analysis parameters

Online_Linkage: <http://sofia.usgs.gov/exchange/holmescores.html>

Description:

Abstract:

The data set contains the Core Number, location, latitude/longitude, date collected, storage location, core surface description, and analyses.

Purpose:

The use of radioactive isotopes is founded on the known physical property of radioactive material, the half-life. A half-life of an isotope is the amount of time it takes for half of a given number of atoms to "decay" to another element. The age of objects that contain radioactive isotopes with known half-lives can be calculated by determining the percent of the remaining radioactive material. To use this method successfully certain other prerequisites must be met. These are: 1. the chemistry of the nuclide (element) is known; 2. once the nuclide is incorporated into the substrate the only change is radioactive decay, and 3. in order to be useful, it is relatively easy to measure.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19940207

Ending_Date: 19970613

Currentness_Reference: ground condition

Status:

Progress: complete

Maintenance_and_Update_Frequency: none planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -81.096

East_Bounding_Coordinate: -80.4082

North_Bounding_Coordinate: 25.2091

South_Bounding_Coordinate: 24.9843

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: core location

Theme_Keyword: radionuclides

Theme_Keyword: radioactive isotopes

Theme_Keyword: sediments

Theme_Keyword: nutrients

Theme_Keyword: surface disturbed zones

Theme_Keyword: piston core

Theme_Keyword: geology

Theme_Keyword: geochemistry

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Taylor Creek region

Place_Keyword: Central Everglades

Place_Keyword: Monroe County

Place_Keyword: Cluett Key

Place_Keyword: Bob Allen Key

Place_Keyword: Rabbit Key

Place_Keyword: Whipray Basin

Place_Keyword: Rankin Bight

Place_Keyword: Lake Ingraham

Place_Keyword: Russell Bank

Place_Keyword: Johnson Key

Place_Keyword: Porjoe Key

Place_Keyword: Trout Creek

Place_Keyword: Little Madeira Bay

Place_Keyword: Crocodile Point

Place_Keyword: Pass Key

Place_Keyword: Florida Bay

Place:

Place_Keyword_Thesaurus:

U.S Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D. C., NIST

Place_Keyword: Florida

Access_Constraints: none

Use_Constraints:

None. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Charles W. Holmes

Contact_Organization: U.S. Geological Survey

Contact_Position: Project chief

Contact_Address:

Address_Type: mailing address

Address: 600 4th Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727 803 8747 ext. 3056

Contact_Facsimile_Telephone: 727 803 2032

Contact_Electronic_Mail_Address: cholmes@usgs.gov

Data_Set_Credit:

Marci Margot and Bowdewjn Remick assisted in analysis of the sores.

Native_Data_Set_Environment: MS Excel

Cross_Reference:

Citation_Information:

Originator:

Holmes, Charles W.

Robbins, John
Halley, Robert
Bothner, Michael
TenBrink, Marilyn
Marot, Marci

Publication_Date: 2001

Title:

Sediment dynamics of Florida Bay mud banks on a decadal time scale

Series_Information:

Series_Name: Bulletins of American Paleontology

Issue_Identification: 361

Publication_Information:

Publication_Place: Ithica, NY

Publisher: Paleontoligical Research Institution

Other_Citation_Details: Paleoecological studies of South Florida, Bruce Wardlaw, editor

Data_Quality_Information:

Logical_Consistency_Report: not applicable

Completeness_Report: not available

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: The location of smaple sites was established by GPS.

Lineage:

Process_Step:

Process_Description:

Long cores (>1 m in length), were taken in >30 cm of water through the "moon pool" of a motorized 25 ft pontoon barge either grounded on the bank or anchored with 4 anchors. The location was established by GPS. A portable 12 ft high tripod was placed over the moon pool to hold the coring piston and for extraction of the core. Cores were taken with 10.8 cm-diameter, clear, FDA food grade polycarbonate tubing. A PVC piston with two O-ring seals was used. The piston was pushed into the bottom of the core tube to a position several cm above the bottom of the tube. A 10 m length of .25 cm diameter braided polypropylene line, attached to a ring threaded into the top of the piston, was pulled through the core tube. The core tube was then carefully lowered through the moon pool and any air trapped in the space between piston and the bottom of the core tube was removed and filled with water. When the tube was several cm above the bottom, the free end of line attached to the piston was affixed to the head of the tripod. Thus when the core tube penetrates the sediment, the piston remains in a fixed position a few cm above the sediment surface producing a vacuum that retards compaction. When the apparatus was set in position, the core tube was quickly thrust about 30 cm into the sediment by hand. Next, an aluminum clamp with handles was fixed to the core tube and two people then forced the core barrel in until it reached the underlying Pleistocene limestone. Next the clamp with handles was removed and a clamp with lifting rings was attached near the air/water interface. A cable through a pulley at the top of the tripod and attached to a hand winch mounted on one leg of the tripod was attached to the lifting ring on the clamp. The cable winch was necessary for extraction due to the weight of the core and strong suction created by the mud. Before extraction, the polypropylene line was removed from the tripod and fixed to the extraction clamp. This was to ensure that the piston remained in a fixed position during extraction and to retard loss of sediment from the bottom of the barrel. A benefit of the clear core tubing was that any leakage around the piston's O-ring seal could be readily observed during the extraction process. A person in the water wearing a face mask observed the core tube to be certain no sediment was lost at the sediment/water interface, to record any elevation difference between the sediment surface inside and outside the core at full penetration, and to quickly place a plastic pipe cap on the bottom of the core as it emerged from the sediment. The core was winched above the surface of the moon pool and lowered to rest vertically on deck. The pipe cap was taped tightly to the tube to prevent leakage. Excess tubing was cut off just below the piston using a large pipe cutter so the piston could be carefully removed without disturbing the sediment surface. In some cases the water above the sediment was carefully siphoned off with a tube to prevent sloshing of water during transport to the laboratory which would disturb the sediment surface. In other cases the piston was left in the core tube during transport. All cores were transported vertically. Each evening cores were transported vertically to a local hospital where X-ray photographs were prepared.

The cores were selected for analysis based on the x-rays. Those cores selected for further analysis were selected on the basis of laminations or other features which indicated the lack of disturbance. The core was placed in an extruding device vertically. The core was then extruded up into a template and sliced. This slice (hockey puck) was place on a preweighed titanium plate and the wet weight determined. The ring was then removed and the slice was trimmed to remove the outer portion of the core. This was done to prevent any contamination that may have occurred at the side of the core barrel during the coring operation. This sample was then bagged and weighed. This weight was found to be important in the determination of water content and thus the dry weight as water was lost during the period of initial sampling and the laboratory analysis. These sample were then stored in a refrigerator and then transhipped to the home based laboratory. For those core selected for trace metal analysis, the slices were sampled from the center of the "hockey puck" with titanium tools and place in an acid washed plastic bottle and frozen.

Process_Date: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Charles W. Holmes

Contact_Organization: U.S. Geological Survey

Contact_Position: Project chief

Contact_Address:

Address_Type: mailing address

Address: 600 4th Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727 803 8747 ext. 3056

Contact_Facsimile_Telephone: 727 803 2032

Contact_Electronic_Mail_Address: cholmes@usgs.gov

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Florida Bay

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.01

Longitude_Resolution: 0.01

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

The spreadsheet contains the following information: Core No., Location, Latitude, Longitude, Date Collected, Storage Location, Core Surface Description, and Analyses.

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Roy Sonenshein

Contact_Organization: U.S. Geological Survey

Contact_Position: Database Manager

Contact_Address:

Address_Type: mailing address

Address:

9100 NW 36th Street

Suite 107

City: Miami

State_or_Province: FL

Postal_Code: 33178

Country: USA

Contact_Voice_Telephone: 305 717-5824

Contact_Facsimile_Telephone: 305 717-5801

Contact_Electronic_Mail_Address: sunshine@usgs.gov

Resource_Description: Florida Bay Core Logs Disposition and Analyses Parameters

Distribution_Liability: The data have no implied or explicit guarantees

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: EXCEL

Format_Version_Date: 1997

Transfer_Size: 0.02

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://sofia.usgs.gov/exchange/holmes/holmescores.html>

Access_Instructions: Log onto the SOFIA web site at <http://sofia.usgs.gov>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20030725

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jo Anne Stapleton

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 521 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 703 648-4592

Contact_Facsimile_Telephone: 703 648-4614

Contact_Electronic_Mail_Address: jastapleton@usgs.gov

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
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Generated by mp version 2.7.19 on Fri Jul 25 10:40:37 2003