This paper presents an attempt at correlating the observed phenomena of small positive gravity anomalies and self-sealing in some geothermal systems with possible geochemical, thermal and flow properties of Such systems. In particular, the East Mesa geothermal area in the Imperial Valley, California shows up to 6 milligal positive residual gravity anomaly. Calculations show that the maximum depth to the center of gravity of the anomalous mass is a few kilometers, which is less than the depth to the basement in the area. We hypothesize that the presence of this gravity anomaly in the midst of a reasonably regular alluvial basin is due to deposition of minerals in pore spaces of sediments by upward rising plumes of geothermal water over geological time.

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