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Lithocap alteration and high-sulfidation mineralization: Insight from active volcanic-hydrothermal systems

RMS-DPI code:  E2-2011-9-1
Scientific session:  Lectures in memory of F.V. Chukhrov
Author listing:  Hedenquist J.
Principal author:  Jeff Hedenquist
Language:  English
Abstract - Summary 
(short description):
Hypogene advanced argillic alteration, typically quartz-alunite with halos of kaolinite ± dickite and roots of pyrophyllite ± diaspore, forms in the epithermal environment from condensates of magmatic vapor that contain SO2 and HCl, all of which exsolved from an underlying intrusive source. The most aggressive, nearly isochemical leaching of host rock by acidic condensate, commonly pH~1, leaves residual silica that recrystallizes to quartz close to the flow channel, forming the core of alteration. The alteration flares upward along feeder structures, and if a lithologic unit is intersected and condensate flows laterally, a subhorizontal blanket of alteration is formed, termed a lithocap; the residual quartz can host subsequently formed Au-Cu ore with high-sulfidation state sulfides. The leached rock lacks the wall-rock buffer, resulting in high-sulfidation state minerals (enargite, etc.) forming by a cooling magmatic fluid. Eventual interaction with less altered rock that has some buffer control causes these mineralizing fluids to evolve to subsequent intermediate sulfidation states, accompanying late-stage gold mineralization. The same trends are evident from active hydrothermal systems.
 
Date of presentation:  15/04/2011
Presentation Place:  IGEM RAS, Conference Hall
 
RMS-DPI code:  E2-2011-9-1
File of proceedings 
(PDF): 
 7819 K
Status:  xPrint
Recieved:  15/04/2011
Accepted:  18/04/2011
Published on-line:  18/04/2011
Permanent address of publication:  http://www.minsoc.ru/E2-2011-9-1/
Contact author(s):  Plotinskaya, Olga Yurievna
 
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