Occurrence of Gold Deposits of the Tumbang Lapan Area of the Middle Kalimantan, Indonesia

인도네시아 중부 칼리만탄 뚬방라판 지역 금광상의 산상

  • Kim In-Joon (Korea Institute of Geoscience and Mineral Resources)
  • Published : 2005.06.01

Abstract

The geology of the Tumbang Lapan area consists of Permian to Carboniferous metamorphic rocks, Cretaceous granitic rocks, and Permian to Tertiary sedimentary and volcanic rocks. Three faults are developed in surveyed area, and are functioned as channels of the hydrothermal solution which farmed quartz veins within tuff3. In the mineralized area, argillic and propylitic alterations are dominant. Argillic altered rocks show the alteration mineral assemblages of kaolinte+sericite+quartz+chlorite+pyrite. Mineral association in propylitic alteration is chlorite+epidote+feldspar+quartz+pyrite+ magnetite. Vein type, fracture filling, stockwork are observed in survey area. As a result of analysis of samples from quartz veins and altered rocks, some mineralized rocks showed $0.01\~4.6g/t$ of gold.

뚬방라판 지역의 지질은 페름기-석탄기의 변성암(천매암), 백악기의 화강암 및 석탄기에서 제 3기의 퇴적암과 화산암 등으로 구성되어있다. 조사지역에는 3조의 단층이 발달하며 열수용액의 통로역할을 하였으며, 이 단층을 따라서 열수용액이 주입되어 응회암내에 석영맥을 형성하였다. 열수에 의한 모암의 변질작용은 조사지역에서 주로 이질 변질작용과 프로필릭 변질작용이 우세하게 나타나며 일부 규화작용도 초래된다. 이질 변질작용은 고령토+견운모+석영+녹니석+황철석의 광물조합을 갖는다. 반면 프로필릭 변질작용은 녹니석+녹염석+장석+석영+황철석+자철석의 광물조합을 갖는다. 조사지역에는 맥상, 파쇄충진, 망상 등의 열수광상이 발달되어 있다 석영맥과 변질암 시료들의 분석결과 금이 0.01g/t에서 4.6g/t으로 나타났다.

Keywords

References

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