Istituto di Geoscienze e Georisorse     
Battaglia S., Gianelli G., Rossi R., Cavarretta G. The sulphur springs geothermal field, St. Lucia, Lesser Antilles: hydrothermal mineralogy of wells SL-1 and SL-2. In: Journal of South American Earth Sciences, vol. 4 (1/2) pp. 1 - 12. Elsevier, 1991.
Two wells have been drilled to depths of 1414 and 2213 meters in the geothermal field of Sulphur Springs, St.Lucia, and reveal a complex volcanic sequence characterized by collapse episodes followed by the emplacement of dacite domes. The geothermal reservoir consists of fractured volcanic rocks and produces superheated steam. Well-bottom temperatures are around 270-290C. The hydrothermal alteration found in both the productive SL-2 well and the non-productive SL-1 is strongly reminiscent of that of porphyry copper deposits, with (1) an inner, high temperature potassic zone characterized by the occurrence of dravitic tourmaline, quartz, and biotite, (2) an outer propylitic alteartion zone that is partly superimposed on (3) a potassic alteration zone. The alteration mineral assemblages indicate that the hydrothermal system has cooled at the levels sampled
URL: http://https://www.journals.elsevier.com/journal-of-south-american-earth-sciences
Subject surface alterations and deposits
petrography and mineralogy
rocks: chemical and petrographical data

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