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Estimated or calculated heat flow values at 18 sites in Jordan are presented in this study. These are the first heat flow measurements on the east flank of the Dead Sea Rift. The data are divided into three groups: 1) High heat flow values adjacent to the Dead Sea Rift, near the Zerqa Ma'in and Zara geothermal areas, range from 91 to M72 mW/m2 . 2) High heat flow values within and adjacent to Azraq Basin range from 70 to 135 mW/m 2 . 3) Normal heat flow values in other parts of Jordan range from 42 to 65 mW/m2 . The mechanism for heat transfer in the first two groups is attributed to rapid ascent of hot water along deep faults. Near the surface, the water's heat is dissipated either by mixing with cooler waters from shallow aquifers, by direct discharge at thermal springs, or by conduction into surrounding country rock. The source of the waters are believed to be deeply buried, confined beds of Lower Paleozoic sandstones. Further study is needed to determine if the Zerqa Ma'in Zara and the Azraq Basin anomalies are separate or part of one larger anomaly. The mechanism of heat transfer in the third group is primarily conductive. These conductive values probably represent the regional "background" heat flow. The results of this study are similar to findings on the west flank of the Dead Sea Rift.

Heat flow at Zerqa Ma'in and Zara and a geothermal reconnaissance of Jordan