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Figure I Generalized map of the Wilbur Mining ... - University of Utah

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Ceo<strong>the</strong>rmal Resources •<br />

GEOCHEHISTRY OF ACTIVE GEOTHERMAL SYSTEMS IN THE NORTHERN BASIN AND RANGE PROVINCE<br />

ABSTOACT<br />

Numerous <strong>the</strong>rmal springs occur in <strong>the</strong><br />

nor<strong>the</strong>rn Basin and Range Province due primarily<br />

to <strong>the</strong> structure and high regional heat flow.<br />

Dilute to slightly saline (200 to 3,000 mg/L<br />

TDS) Ca and/or Na-UCO, type waters, many<br />

associated with travertine, are dominant in<br />

eastern and nor<strong>the</strong>astern Nevada. CO.-charged<br />

Na-HCO waters are particularly common along <strong>the</strong><br />

eastern side <strong>of</strong> <strong>the</strong> Sierra Nevada from Long<br />

Valley north to Bridgeport. Moderately to very<br />

saline (3,000 to 35,000 mg/L TDS) Na-Cl type<br />

waters predominate near major topographic lows,<br />

Na-SO. type waters are common in western Nevada<br />

and in nor<strong>the</strong>astern California. Na-mixed anion<br />

waters are common along <strong>the</strong> north side <strong>of</strong> <strong>the</strong><br />

Black Rock Desert in northwestern Nevada and <strong>the</strong><br />

Alvord Desert in sou<strong>the</strong>astern Oregon,<br />

Measured temperatures in deep geo<strong>the</strong>rmal<br />

wells in <strong>the</strong> nor<strong>the</strong>rn Basin and Range Province<br />

are about 14 C cooler than <strong>the</strong> average<br />

temperature calculated using two chemical and<br />

one isotope geo<strong>the</strong>rmometer on waters discharged<br />

by nearby <strong>the</strong>rmal springs and shallow wells<br />

(

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