40Ar/39Ar Geochronology of Rumbia Schist Complex: New Implications For Timing and Hydrothermal Activity in The Southeast Sulawesi Gold Prospect, Indonesia

Authors

  • Musri M Department of Geology Engineering, Faculty of Engineering, Hasanuddin University, Makassar 90245, Indonesia
  • E. Suparka Department of Geology, Institute of Technology Bandung, 40116 Indonesia
  • C. I. Abdullah Department of Geology, Institute of Technology Bandung, 40116 Indonesia
  • N. I. Basuki Department of Geology, Institute of Technology Bandung, 40116 Indonesia
  • M. A. Forster Research School of Earth Sciences, The Australian National University, Canberra, Australia

DOI:

https://doi.org/10.20956/ijesca.v3i2.1086

Keywords:

Hydrothermal, Gold, Deposits, 40Ar/39Ar, Timing, Rumbia, Complex, Southeast, Sulawesi

Abstract

The Rumbia Mountains, which in this study named Rumbia Complex is an east-west oriented, composed by a high-pressure/low-temperature, and a medium-pressure/low-temperature metamorphic rocks. The complex is identified as mica schist, glauchopane schist, and green schist. Rumbia Complex known as the location of gold deposits prospects discovered by local communities since 2007. The results of research showed that the metamorphic rocks are as hosts. There are two period of gold mineralization that occurs in this area, namely: 1) Associated with tectonic deformation and metamorphic rocks exhumation as a first period, and 2)  Gold deposits related to post-tectonic as a result of hydrothermal activity in the Rumbia Complex. Radiometric age dating used 40Ar/39Ar geochronology, indicate that the first period of gold mineralization in the Rumbia Complex occurred ≈23 million years ago (MA), and the second period were subsequently overprinting at ≈6.8 million years ago (MA).

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Published

2017-04-06

Issue

VOLUME 3 ISSUE 2, NOVEMBER 2016

Section

Articles