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Título del libro: Life With Ore Deposits On Earth, Proceedings Of The 15th Sga Biennial Meeting, 2019, Vols 1-4 Título del capítulo: Timing and P-T conditions of epithermal mineralization in the Bacis and La Cienega Mining districts, Durango, Mexico
The Bacis and La Cienega districts are Au-Ag hydrothermal deposits
located in the Sierra Madre Occidental (SMO) in Mexico. The
mineralization in both districts is related to NW-NNW trending
structures and exhibits high Au-Ag ratio which become Ag-dominant at
deeper levels.
New U-Pb ages from the volcanic host-rock, and K-Ar and Ar-40/Ar-39 ages
in adularia and illite from the mineralization assemblages, allow a
re-evaluation of the timing of the hydrothermal mineralizing events. In
both districts the basement consists of the Lower Triassic and Upper
Jurassic metasedimentary successions which are intruded by monzogranitic
plutons and overlain by andesitic lavas belong to the Lower Volcanic
Complex (LVC). These rocks are in turn covered by an Oligocene
ignimbrite succession and rhyolitic domes of the Upper Volcanic
Supergroup (UVS). Mineralizing veins affect all the stratigraphic
column.
Fluid inclusion microthermometry and decriptometry studies yield
comparable temperature ranges in both districts at 210 to 230 degrees C
and 410-430 degrees C, suggesting the occurrence of a similar
mineralizing event. The chemical composition and temperature of
formation of chlorite associated with Ag-rich and Au-rich mineralization
stages show a bimodal distribution with peaks at 330 degrees C and 270
degrees C, respectively.
Entidades citadas de la UNAM:
Fuente:
ISBN: 9780852619629 Editorial: SOC GEOLOGY APPLIED MINERAL DEPOSITS-SGA
