| Abstract: | Magnetic anomalies are due to variations in the Earth‘s magnetic field caused by the uneven distribution of magnetic minerals (primarily magnetite) in the rocks that make up the upper part of the Earth‘s crust. The features and patterns of the magnetic anomalies can be used to delineate details of subsurface geology, including the locations of buried faults and magnetite-bearing rocks and the depth to the base of sedimentary basins. This information is valuable for mineral exploration, geologic mapping, and environmental studies.
The Iowa magnetic map is constructed from grids that combine information collected in nine separate magnetic surveys conducted between 1953 and 1972. The data from these surveys are of varying quality. The design and specifications (terrain clearance, sampling rates, line spacing, and reduction procedures) varied from survey to survey depending on the purpose of the project and the technology of that time. Every attempt was made to acquire the data in digital form. All survey grids have been continued to 305 m (1,000 ft) above ground and merged together to form the State compilation. |
| Genre: | USGS Numbered Series |
| ProdID: | 72301 |
| Citation Author: | Kucks, Robert P.; Hill, Patricia L. |
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| Citation Edition: | Online only, Version 1.0 |
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| Citation Language: | ENGLISH |
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| Citation No Pagination: | Y |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | Unpaginated; maps |
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| Citation Series: | Data Series |
| Citation Series Code: | DS |
| Citation Series Number: | 135 |
| Citation Search Results Text: | Iowa magnetic and gravity maps and data: a web site for distribution of data; 2005; DS; 135; Kucks, Robert P.; Hill, Patricia L. |
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| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Iowa magnetic and gravity maps and data: a web site for distribution of data; 2005; DS; 135; Kucks, Robert P.; Hill, Patricia L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/ds/2005/135/ |
| Date Other: | Tue, 20 Sep 2005 00:00 -0500 |
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