T171 Source to Surface Magma Thermodynamics and Transport: Interdisciplinary Approaches to Documenting the How, Where, and When of Magma Generation and Evolution during Ascent, Storage, and Eruption (Posters)

Tuesday, 11 October 2022
9:00 AM - 1:00 PM
Exhibit Hall F

TIMESCALE OF THE PROGRADE DECARBONATION IN A MAGMATIC-HYDROTHERMAL EVENT

Paper number: T171-17
Program: Technical Sessions
Time: 9:00 AM – 1:00 PM

Authors

Abstract

Magmatic-hydrothermal systems carry metals, sulfur, and carbon from deep to shallow crust, supplying materials to the society and potentially affecting Earth’s long-term ecosystem of the Earth. Elements fluxes, and hence environmental consequences, are ultimately functions of the time-integrated amounts and durations. In this study, we estimate the duration of prograde metamorphism induced by fluid infiltration. The duration of prograde was 17.7 ~ 34.7 kyr, resulting in reasonably large fluxes of metal elements that corroborate the tonnages of ore deposits. This prograde process takes an order of magnitude longer to complete than the eruption of a felsic volcano (~1 kyr). If the prograde metamorphism approaches completion and transforms carbonate precursors to calc-silicate assemblages, the reactions release CO2 at a rate of 0.21 ~ 0.71 Mt/y, similar to the CO2 fluxes of volcanos that threaten ecosystem, such as Stromboli. The impact of magmatic-hydrothermal events on Earth’s environmental evolution awaits further quantitative studies.

Geological Society of America Abstracts with Programs. Vol. 54, No. 6

doi: 10.1130/abs/2022AM-378084

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