A new crustal model based on isostatic residual gravity, geologic mapping, well information, and density measurements shows that the high-gradient parts of the residual gravity anomaly can be explained in terms of lithologic variations within the upper 7 km of the crust, consistent with the upper-crustal framework of the area. This conclusion does not rule out the presence of a magma chamber at lower crustal depths; the broad aspects of the gravity anomaly support the presence of low-density partial melting at 15 to 20 km depth, consistent with magnetotelluric soundings and other geophysical measurements.
Citation Information
| Publication Year | 1993 |
|---|---|
| Title | Geyser's magma chamber, California: constraints from gravity data, density measurements, and well information |
| Authors | Richard J. Blakely, W. D. Stanley |
| Publication Type | Conference Paper |
| Publication Subtype | Conference Paper |
| Index ID | 70018004 |
| Record Source | USGS Publications Warehouse |