Shallow Drilling in the Salton Sea Region: The Thermal Anomaly

Abstract

AThis is a preprint of a paper intended for publication in a joMrnal or proceedings. Since changes may be made before publication, this preprint ir made available with the understanding that it will not be cited or reproduced without the permhion of the author. There is no broad thermal anomaly associated with the magnetic high that extends offshore to the northeast from the volcanic domes. These observations of the thermal anomaly provide important constraints for models of the circulation of the hydrothermal system. Thexmal budgets based on a simple model for this hydrothermal system indicate that the heat influx rate for local "hot spots" in the region may be large enough to account for the rate of heat flux from the entire Salton Trough. DISCIAIMER

Seismic imaging of the metamorphism of young sediment into new crystalline crust in the actively rifting Imperial Valley, California

“… Heat flow in the Imperial Valley, compiled from Newmark et al . [], Sass et al . [], and the original data that were presented as gridded averages by Lachenbruch et al .…”

The DOE Thermal Regimes Drilling Program through 1987

“…whose new shallow temperature-gradient measurements now cover both the onshore and offshore parts of the system. peratures in wells drilled to 2500 m might be expected to be ~ 2500C (Newmark et al, 1988). The location of this shallow heat-flow anomaly coincides with the temperature anomaly measured in deep geothermal wells (Fig.…”

“…This omission has since been remedied by the work of Newmark et al (1986Newmark et al ( , 1988. whose new shallow temperature-gradient measurements now cover both the onshore and offshore parts of the system.…”

“…Trough, and that these intense local thermal anomalies are shon-lived (Newmark et al 1988). These results also confIrm the inferences made by Kasameyer et al (1984) that the SSGS is young (S 10" years).…”

Controls on the geomorphic expression and evolution of gryphons, pools, and caldera features at hydrothermal seeps in the Salton Sea Geothermal Field, southern California

“…This seep field exhibits consistent activity throughout the year (Muffler and White, 1968;Sturz et al, 1992) and is where the majority of the gryphons within the SSGF field are found. The Davis-Schrimpf field lies at the northeast edge of a large temperature anomaly in the shallow subsurface within the SSGF where thermal gradients drop from 0.8°C/m at the peak of the anomaly to 0.1°C/m over a distance of less than 4 km (Newark et al, 1988). This linear gradient also corresponds with the position of the Calipatria fault and a lineament of scattered vent features that extends to the northwest into the Salton Sea (Lynch and Hudnut, 2008).…”