Self-organized criticality of the Olon Ovoot gold-mineralizing system, located in southern Mongolia, was examined employing field mapping, strain analysis, and stable isotope systematics. Stable isotope data suggest metamorphic fluids (7.8‰≤δ18O≤10.6‰ and -33.7‰≤ δD≤-47.8‰) feeding steadily into the system. Reconstruction of incremental strain axes at the time of gold mineralization (dY=27/106, dX=59.5/322, and dZ=15.5/204) reveals plane, coaxial strain environment. Under such strain state, fluids were likely buffered by rocks in closed systems, as indicated by locally homogeneous oxygen isotope systematics of vein ankerite (δ18O ank=22.3±0.5‰). Fluids might also have episodically redistributed in fluid-buffered, open systems under isothermal conditions, as evidenced by uniform oxygen isotope compositions of vein quartz (δ 18Oqtz=15.9±0.7‰) and complex web of fault-fill and extensional lodes. It was during these transient episodes of fluid advection and gold lode formation that the system potentially self-organized into its critical state.
|Advisor:||Kelty, Thomas K.|
|Commitee:||Holk, Gregory J., Yin, An|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 56/06M(E), Masters Abstracts International|
|Keywords:||Fault-valve behavior, Mineral system, Olon ovoot, Orogenic gold, Self-organized critical system, Southern mongolia|
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