At Larderello an older phase of hydrothermal activity (350 degree -580 degree C) was characterized by wollastonite, andradite, clinopyroxene, plagioclase (An 1-60%), biotite, tourmaline and sulphides. In a more recent phase (150 degree -450 degree C), K-feldspar, albite, epidote, chlorite, sphene, tremolite-actinolite, clinopyroxene and sulphides were deposited. The first appearance of K-feldspar (230 degree -270 degree C), epidote (230 degree -290 degree C), tremolite-actinolite (290 degree -340 degree C) and albite (T 330 degree C) gives vertical distribution patterns of temperatures in good agreement with the present-day isotherms. In the Mt. Amiata field albite, calcite, K-mica, quartz, plus or minus K-feldspar plus or minus chlorite were deposited in the range 250 degree -350 degree C.
Distribution of hydrothermal minerals in the Larderello-Travale and Mt. Amiata geothermal fields (Italy) / G.BERTINI; G.GIANELLI; E. PANDELI; M.PUXEDDU. - STAMPA. - 9(1):(1985), pp. 261-266. (Intervento presentato al convegno 1985 International Symposium on Geothermal Energy tenutosi a Kailua-Kona (Hawaii) nel 26-30 August 1985).
Distribution of hydrothermal minerals in the Larderello-Travale and Mt. Amiata geothermal fields (Italy)
PANDELI, ENRICO;
1985
Abstract
At Larderello an older phase of hydrothermal activity (350 degree -580 degree C) was characterized by wollastonite, andradite, clinopyroxene, plagioclase (An 1-60%), biotite, tourmaline and sulphides. In a more recent phase (150 degree -450 degree C), K-feldspar, albite, epidote, chlorite, sphene, tremolite-actinolite, clinopyroxene and sulphides were deposited. The first appearance of K-feldspar (230 degree -270 degree C), epidote (230 degree -290 degree C), tremolite-actinolite (290 degree -340 degree C) and albite (T 330 degree C) gives vertical distribution patterns of temperatures in good agreement with the present-day isotherms. In the Mt. Amiata field albite, calcite, K-mica, quartz, plus or minus K-feldspar plus or minus chlorite were deposited in the range 250 degree -350 degree C.
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