Description

Location: Reno, NV via Zoom

Contact: peter.obyrne@outlook.com

GSN MEMBERSHIP MEETING – FRIDAY, NOVEMBER 20, 2020

SPEAKER: Bill Chavez, New Mexico Tech, Mineral Engineering Professor

TITLE:  “Zoning Collapse in well-developed Epithermal Environments:  Vertical Extension of High-Sulfidation Alteration-Mineralization” (See Abstract Below Zoom info.)

DATE/TIME: November 20, 2020. Login begins at 6:45 PM Pacific Time (US and Canada). Talk at 7:00 pm

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Meeting ID: 863 0521 0990
Passcode: 703268

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Meeting ID: 863 0521 0990
Passcode: 703268

Abstract:

Long-lived and geochemically mature high-sulfidation epithermal systems offer the opportunity to examine mineralogic changes that represent the vertically-directed collapse  of well-developed hydrothermal systems. Minerals stable in the topographically higher

and cooler epithermal domains become stable in the former higher-temperature, deeper environments as the system wanes and collapses, with depression of the near-surface assemblages to those characterizing near-porphyry environments. Such vertical collapse may extend up to +/- 1.5km from the paleosurface.

The most sensitive minerals reflecting system geochemical subsidence are volatile-rich,  and may coexist with late magmatic minerals formed in the earliest stages of a  waxing hydrothermal system.  The progressive and sequential collapse of large hydrothermal systems may be recognized in exploration drill holes as distinct mineral overprinting indicated by  paragenetic relationships and juxtaposed mineral assemblages unrelated to faulting.

Details

11/20/2020 18:45:0011/20/2020 20:30:00America/Los_AngelesGSN Membership Meeting – Friday, Nov. 20, 2020 – Bill Chavez talk @ 7 pmReno, NV
Event StartsEvent Ends
11/20/202011/20/2020
All Day Event
6:45pm8:30pm