Rear polymineral zone of near-veined metasomatic aureole in mesothermal Zun-Holba gold deposit (Eastern Sayan)

T Cherkasova,I Kucherenko,R Abramova

doi:10.1088/1755-1315/27/1/012003

Abstract

Unique data of the mineralogical and petrochemical zoning of near- veined metasomatic aureole of mesothermal Zun-Holba gold deposit are presented and discussed. It was established that mineralogical and petrochemical zoning order is based on Korzhinsky theory describing the differential component mobility. However, the internal polymineral zone structure of metasomatic column in Zun-Holba deposit does not comply with Korzhinsky concept describing the mono-mineral composition of axial (ore-bearing quartz veins) and binary-mineral rear (quartz-sericite) zones. Mineral zoning complication is governed by component diffusion (from fractured fluid to pores) and pulsation mode of metalliferous fluid input into the mineralization area.

Highlights

Since the 50's of the twentieth century, most experts accepted the non-alternative Korzhinsky theory of metasomatic processes, metasomatic zoning [1]
There still exists a misunderstanding in assessed mineral composition of metasomatic rocks in the axial zone and adjacent rear zone involving zonal near-veined metasomatic aureole
In near-fractured metasomatism, where invading external metalliferous fluids into cracks intensify rock alteration, sequential transformation of components from inert into mobile state accompanied by mineral dissolution in parent rocks occurs

Summary

Introduction

Since the 50's of the twentieth century, most experts accepted the non-alternative Korzhinsky theory of metasomatic processes, metasomatic zoning [1]. Beresite according to its mineral-chemical pyrite-quartz-sericite-carbonate composition is often associated with metasomatites, but due to the fact that it is not found in near-ore altered quartz-sericite and quartz as described in the metasomatic zoning theory [5], this fact in itself is often neglected.

Results

Conclusion