Hydrothermal alteration and timing of gold mineralisation in the Rumbia Complex, Southeast Arm of Sulawesi, Indonesia

2nd Transdisciplinary Research on Environmental Problems in Southeast Asia

地球科学;生态环境科学

Mawaleda, Musri^1 ; Suparka, Emmy^2 ; Idham Abdullah, Chalid^2 ; Indro Basuki, Nurcahyo^2 ; Forster, Marnie^3 ; Jamal^1 ; Kaharuddin^1

Department of Geology, Hasanuddin University, Makassar, Indonesia^1

Department of Geology, Institute of Technology Bandung, Indonesia^2

Research School of Earth Sciences, Australian National University, Canberra, Australia^3

关键词: Complex;    Hydrothermal;    Rumbia;    Southeast;    Sulawesi;    Timing;    ^40Ar/^39Ar;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/71/1/012030/pdf
DOI  :  10.1088/1755-1315/71/1/012030

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Rumbia Mountains, which in this study named Rumbia schist Complex is an east-west oriented, composed by a high-pressure/low-temperature, and a medium-pressure/low-temperature metamorphic rocks. 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 phase of gold mineralization that occurs in this area, namely: 1) Associated with tectonic deformation and metamorphic rocks exhumation, and 2) gold-related hydrothermal deposits. Radiometric age dating used40Ar/39Ar geochronology, indicate that the first of gold mineralisation in the Rumbia Complex occurred ∼23 million years ago, and the second gold mineralisation were subsequently overprinting at 7 million years ago.