Rock Properties Database, updated 2021: Density, Magnetic Susceptibility, and Natural Remanent Magnetization of Rocks in Minnesota

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Persistent link to this item

http://dx.doi.org/10.13020/D63S3D
https://hdl.handle.net/11299/175581

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Collection period

Date completed

2021

Date updated

Time period coverage

Geographic coverage

Minnesota

Source information

MGS Rock Properties Database Web GIS (interactive) Database

Journal Title

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Volume Title

Title

Rock Properties Database, updated 2021: Density, Magnetic Susceptibility, and Natural Remanent Magnetization of Rocks in Minnesota

Published Date

2015-11-19

Authors

Chandler, V.W

Lively, R.S

Group

Minnesota Geological Survey

Author Contact

Minnesota Geological Survey
mgs@umn.edu

Type

Dataset
Observational Data
Spatial Data

Abstract

Geologic interpretation of gravity and magnetic anomaly data in a given area is greatly enhanced if density, magnetic susceptibility (MS) and natural remanent magnetization (NRM) data are available for representative rock-types (Chandler and others, 2008). Along with geologic information from outcrop and drill-holes, rock property data help relate geophysical anomaly signatures to probable rock types, and provide constraints on the use of anomaly data as a tool for mapping and for modeling geology at depth. Rock property data are particularly important to Minnesota where Precambrian rocks, which comprise the bulk of the bedrock surface, are associated with a wide range of density, MS and NRM values and are mostly under a thick cover of unconsolidated glacial sediments.

Description

The current database consists of locations for 9,032 entries. No additional data has been added in 2021, but the H. Mooney seismic velocities have been corrected from the earlier data. The surface-based, point data include 5,272, 6,939, and 903 density, magnetic susceptibility, and NRM measurements, respectively. Downhole data from 146 drillcore have also been incorporated, yielding an additional 1,145 and 9,622 measurements of density and magnetic susceptibility, respectively. Finally, the location of new and some pre-existing rock property sites was improved by using outcrop polygons and improved base-map overlays to adjust point locations to most-likely positions as necessary. Thus, the revised database represents a significant improvement in size, types of material, and quality, and should serve the needs of the MGS and the broader geologic community for many years to come. The thumbnail was taken from a figure in the report that shows the point locations in the 2011 rock property database superimposed on the 2011 bedrock geology map of Minnesota.

Referenced by

Chandler, V.W; Lively, R.S. (2011). Density, Magnetic Susceptibility, and Natural Remanent Magnetization of Rocks in Minnesota: An MGS Rock Properties Database. Minnesota Geological Survey. Retrieved from the University of Minnesota Digital Conservancy, http://hdl.handle.net/11299/175580

Related to

Replaces

2003 MGS Rock Properties Database
http://purl.umn.edu/92942
2011 MGS Rock Properties Database:
https://hdl.handle.net/11299/175581.1

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Data Repository for U of M (DRUM)

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Previously Published Citation

Suggested citation

Chandler, V.W; Lively, R.S. (2015). Rock Properties Database, updated 2021: Density, Magnetic Susceptibility, and Natural Remanent Magnetization of Rocks in Minnesota. Retrieved from the Data Repository for the University of Minnesota (DRUM), http://dx.doi.org/10.13020/D63S3D.

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