Great Basin Geochemical Data for Groundwater Concentration Maps

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Zehner, R.E.
Originator: Coolbaugh, M.F.
Originator: Shevenell, Lisa
Publication_Date: 20060530
Title: Great Basin Geochemical Data for Groundwater Concentration Maps
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: University of Nevada, Reno
Publisher: Nevada Bureau of Mines and Geology
Other_Citation_Details:
Zehner, R.E., Coolbaugh, M.F., and Shevenell, Lisa, 2006, Regional groundwater geochemical trends in the Great Basin: Implications for Geothermal Exploration, GRC Transactions 2006
Online_Linkage:
\\palido.unr.edu\geothermal\_projects\metadata_updates\04_Geochemical_Data\FTP_Zip_Files\04_Geochemical_Data\GroundwaterSampleSites.shp
Description:
Abstract:
Maps of Great Basin groundwater geochemistry show distinctive regional spatial patterns. Factors affecting the concentrations of dissolved constituents include bedrock lithology, location within structural zones, geothermal systems, and surficial playa deposits and salt lakes. In this study, a large geochemical database of ~24,750 Great Basin groundwater samples from springs and wells was compiled from multiple sources. These data were uploaded into a geographic information system (GIS) and used to produce concentration maps for As, B, Ba, Ca, Cl, F, Fe, HCO3, K, Li, Mn, Na, SiO2, and SO4. These maps were then examined to identify geologic factors that might have influenced their concentration, including the presence of geothermal systems. A weights-of-evidence statistical analysis was then performed to assess the correlation between the concentration maps and a set of ?150o C geothermal systems. The results indicate that all 14 constituents correlate to some degree with geothermal systems. Fluorine, boron, arsenic, and silica have the highest spatial correlation. In addition, a subset of the data representing samples with measured temperatures ?20oC was also analyzed; overall correlations were lower, but manganese, arsenic, and silica are still useful indicators. Samples from both the full and the ?20oC datasets were grouped into statistically significant populations. Break points for these groups can be used as a measure of likelihood of a sample having been influenced by geothermal activity. The study shows that (1) regional groundwater geochemical patterns exist in the Great Basin, (2) these patterns can serve as effective geothermal exploration tools, and (3) a set of concentrations derived from the weights-of-evidence analysis may serve as favorability indices indicative of the influence of geothermal activity on hot and cold groundwater samples.
Purpose: Geothermal exploration
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date:
REQUIRED: The year (and optionally month, or month and day) for which the data set corresponds to the ground.
Currentness_Reference:
REQUIRED: The basis on which the time period of content information is determined.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -123.983669
East_Bounding_Coordinate: -109.109959
North_Bounding_Coordinate: 44.811896
South_Bounding_Coordinate: 33.554788
Keywords:
Theme:
Theme_Keyword_Thesaurus:
REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.
Theme_Keyword: geochemistry
Theme_Keyword: groundwater
Theme_Keyword: hot spring
Theme_Keyword: GIS
Theme_Keyword: shapefile
Place:
Place_Keyword: USA
Place_Keyword: Western United States
Place_Keyword: Great Basin
Place_Keyword: Nevada
Place_Keyword: California
Place_Keyword: Utah
Place_Keyword: Idaho
Place_Keyword: Arizona
Place_Keyword: Oregon
Place_Keyword: Wyoming
Access_Constraints:
Although these data have been processed successfully on the computer system at the Nevada Bureau of Mines and Geology, no warranty expressed or implied is made regarding the accuracy or utility of the data on any system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that these data be directly acquired from the Nevada Bureau of Mines and Geology. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The Nevada Bureau of Mines and Geology shall not be held liable for improper use of the data described and/or contained herein. By using this data you hereby agree to these conditions.
Use_Constraints:
Reference and acknowledge the Nevada Bureau of Mines and Geology or specific author in products derived from this map. Do not reproduce for commercial purposes. This data is not surveyed data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nevada Bureau of Mines and Geology
Contact_Person: web/GIS/database person
Contact_Position: web/GIS/database
Contact_Address:
Address_Type: mailing and physical address
Address: University of Nevada, Reno MS178
City: Reno
State_or_Province: NV
Postal_Code: 89557-0178
Country: USA
Contact_Voice_Telephone: 775-784-6691
Contact_Electronic_Mail_Address: nbmg@unr.edu
Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)
Contact_Instructions: web/GIS/database person
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Unknown. Data is derived from several sources (NWIS, Geo-Heat Center, NBMG Geothermal Database) with unknown sample location and attribute accuracy.
Logical_Consistency_Report: Unknown
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: unknown
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: unknown
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Zehner, R.E.
Originator: Coolbaugh, M.F.
Originator: Shevenell, Lisa
Publication_Date: 20060530
Title:
Regional Groundwater Geochemical Trends in the Great Basin, Implications for Geothermal Exploration
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: University of Nevada, Reno
Publisher: Nevada Bureau of Mines and Geology
Process_Step:
Process_Description:
The data set was constructed using groundwater geochemical data (springs and wells) from three sources: (1) the National Water Information System ("NWIS", USGS, 2005), which includes cold temperature springs and wells along with the former GEOTHERM database, (2) the Nevada Bureau of Mines and Geology's geothermal database (http: HTTP://www.nbmg.unr.edu/geothermal/gthome.htm), and (3) the Geo-Heat Center's Western Geothermal Database (Reed et al., 1983; Boyd, 2002). Spring and well samples within a 100 km radius of the Great Basin were used so that outside values would form a continuous concentration surface right up to the Great Basin boundary. Not all samples were analyzed for all constituents; few of the samples were analyzed for all 14 constituents that were examined. The data were first screened to remove surface water samples. Next, a histogram analysis was performed that identified an approximate log-normal distribution for all elements. Consequently, the [natural] log of concentration of the 14 cations/anions was calculated. The sample values of each constituent at each site were then averaged: for the NWIS data in its one-to-many format, sample data was averaged for each location of the site table; for the Geo-Heat and NBMG data sets, samples having identical location coordinates were averaged. Finally, the three data sets were spatially screened for duplicate samples, which were removed. The final table contains data from 24,769 aggregate geochemical samples from both hot and cold springs and wells, summarized in Table 1. Of these, 8,780 samples have reported temperatures of >20oC and probably have been influenced by geothermal activity. A subset of data containing 10,713 records from samples with measured temperatures ?20oC was also made. These two files were then loaded into a GIS for analysis.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 24769
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 11
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -117.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000
Ordinate_Resolution: 0.000000
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: GBgeochem
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: OBJECTID
Attribute:
Attribute_Label: NEWID
Attribute:
Attribute_Label: OLDID
Attribute:
Attribute_Label: SOURCE
Attribute:
Attribute_Label: NAME
Attribute:
Attribute_Label: LONGITUDE
Attribute:
Attribute_Label: LATITUDE
Attribute:
Attribute_Label: TYPE
Attribute:
Attribute_Label: TEMPC
Attribute:
Attribute_Label: K
Attribute:
Attribute_Label: LNK
Attribute:
Attribute_Label: NA
Attribute:
Attribute_Label: LNNA
Attribute:
Attribute_Label: CA
Attribute:
Attribute_Label: LNCA
Attribute:
Attribute_Label: SIO2
Attribute:
Attribute_Label: LNSIO2
Attribute:
Attribute_Label: AS_
Attribute:
Attribute_Label: LNAS
Attribute:
Attribute_Label: B
Attribute:
Attribute_Label: LNB
Attribute:
Attribute_Label: BA
Attribute:
Attribute_Label: LNBA
Attribute:
Attribute_Label: CL
Attribute:
Attribute_Label: LNCL
Attribute:
Attribute_Label: F
Attribute:
Attribute_Label: LNF
Attribute:
Attribute_Label: FE
Attribute:
Attribute_Label: LNFE
Attribute:
Attribute_Label: LI
Attribute:
Attribute_Label: LNLI
Attribute:
Attribute_Label: MN
Attribute:
Attribute_Label: LNMN
Attribute:
Attribute_Label: SO4
Attribute:
Attribute_Label: LNSO4
Attribute:
Attribute_Label: SR
Attribute:
Attribute_Label: LNSR
Attribute:
Attribute_Label: HCO3
Attribute:
Attribute_Label: LNHCO3
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nevada Bureau of Mines and Geology
Contact_Person: web/GIS/database person
Contact_Position: web/GIS/database
Contact_Address:
Address_Type: mailing and physical address
Address: University of Nevada, Reno MS178
City: Reno
State_or_Province: NV
Postal_Code: 89557-0178
Country: USA
Contact_Voice_Telephone: 775-784-6691
Contact_Electronic_Mail_Address: nbmg@unr.edu
Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)
Contact_Instructions: web/GIS/database person
Resource_Description: Downloadable Data
Distribution_Liability:
Requestor hereby releases the Nevada Bureau of Mines and Geology, the University of Nevada, Reno, and their agents, consultants, contractors or employees from any and all claims, action, or causes of action for damages including, but not limited to any costs of recovering, reprogramming or reproducing any programs or data stored in or used with the GIS data, damage to property, damages for personal injury or for any lost profits, lost savings, or other special, incidental or consequential damages arising out of the use of or inability to use the GIS data, even if said parties have been advised of the possibility of such damage. Requestor agrees to indemnify and hold harmless the Nevada Bureau of Mines and Geology, the University of Nevada, Reno, and their agents, consultants, contractors and employees from any and all liability claims or damages to any person arising from or connected with the use of this GIS data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
File_Decompression_Technique: Zip file
Transfer_Size: 16.250
Metadata_Reference_Information:
Metadata_Date: 20100706
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Nevada Bureau of Mines and Geology
Contact_Person: web/GIS/database person
Contact_Position: web/GIS/database
Contact_Address:
Address_Type: mailing and physical address
Address: University of Nevada, Reno, MS 178
City: Reno
State_or_Province: NV
Postal_Code: 89557-0178
Country: USA
Contact_Voice_Telephone: 775-784-6691
Contact_Electronic_Mail_Address: nbmg@unr.edu
Hours_of_Service: 8:00 a.m. - 3:00 p.m. (PST)
Contact_Instructions: web/GIS/database person
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.14 on Mon Aug 13 15:16:05 2012