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U.S. Geological Survey Open-File Report 2009-1044

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### In Cooperation with the Pacific Gas and Electric Company

# Aeromagnetic Survey Map of the Central California Coast Ranges

#### By V.E. Langenheim, R.C. Jachens, and K. Moussauoi

#### 2009

| Abstract
This aeromagnetic survey was flown as part of a Cooperative Research and Development Agreement (CRADA) with the Pacific Gas and Electric Company and is intended to promote further understanding of the geology and structure in the central California Coast Ranges by serving as a basis for geophysical interpretations and by supporting geological mapping, mineral and water resource investigations, and other topical studies. Local spatial variations in the Earth's magnetic field (evident as anomalies on aeromagnetic maps) reflect the distribution of magnetic minerals, primarily magnetite, in the underlying rocks. In many cases the volume content of magnetic minerals can be related to rock type, and abrupt spatial changes in the amount of magnetic minerals can commonly mark lithologic or structural boundaries. Bodies of serpentinite and other mafic and ultramafic rocks tend to produce the most intense magnetic anomalies, but such generalizations must be applied with caution because rocks with more felsic compositions, such as the porphyritic granodiorite-granite of the La Panza Range, and even some sedimentary units, also can cause measurable magnetic anomalies. | Version 1.0

Posted April 21, 2009
-  **Map** PDF (34" x ~37"; 9 MB) 
-  **Readme** text file (56 kB) .  This file describes the format of the data file linked below. 
-  **Metadata** text file (64 kB) .  These are the FGDC standard digital geospatial metadata for the data file linked below. 
-  **Data** xyz file (cencal_mag.xyz; 627 MB) .  This file contains the approximately 2,750,000 point data that were gridded and contoured to produce aeromagnetic contours on the map.

**For additional information contact:**Victoria Langenheim

Geophysics Unit of Menlo Park, Calif. (GUMP)

This report is available only on the Web.

Part of this report is presented in Portable Document Format (PDF); at least version 7 of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge. |
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### Suggested citation:

Langenheim, V.E., Jachens, R.C., and Moussaoui, K., 2009, Aeromagnetic survey map of the central California Coast Ranges:  U.S. Geological Survey Open-File Report 2009-1044, scale 1:250,000 and database [https://pubs.usgs.gov/of/2009/1044/].

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