Abstract
P–T conditions during skarn formation in the 75.5 Ma old Ocna de Fier-Dognecea (SW Romania) ore district are assessed in this work using a combination of petrogenetic grids, Berman's TWEEQU programme, and several independent geothermobarometers. These were applied both to hornfelses surrounding the skarn and to the granodiorite which caused the skarn and contact metamorphism. The results are consistent and point to a peak metamorphic temperature of 700 ± 50 °C, decreasing away from the contact, and to a pressure of 2.8 ± 1 kbar, equivalent to ∼10 km depth in the region. These results quantify the qualitative idea that skarn mineralisation normally forms in a high T, low P contact metamorphic environment.
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Received: 13 February 1998 / Accepted: 8 April 1999
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Nicolescu, Ş., Cornell, D. P–T conditions during skarn formation in the Ocna de Fier ore district, Romania. Mineral. Deposita 34, 730–742 (1999). https://doi.org/10.1007/s001260050234
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DOI: https://doi.org/10.1007/s001260050234