Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
권호 표지
DOI QR코드

DOI QR Code

Geochemical Exploration for Metallic Mineral Resources on the Pacitan District, East Java, Indonesia

인도네시아 빠찌딴지역 금속광물자원에 대한 지화학탐사

  • Received : 2010.12.27
  • Accepted : 2011.02.16
  • Published : 2011.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

The geology of the Pacitan district which occupies Southern mountain zone in the southwestern margin of East Java, Indonesia, consists of a pile of clastics and pyroclastics grading upwards into a series of sediments of Middle Miocene age which are intruded by a number of quartz porphyries and subvolcanic dacitic to andesitic bodies in after that time. The geochemical exploration in the Pacitan district to find out anomalous areas related with metallic mineral dispersion from the concealed ore deposits had been carried out using traditional exploration techniques of geological mapping, stream sediment, panned concentrate and outcrop sampling. The anomalous zones of each element were detected in the following areas: Gempol for Cu; Jompong for Au; Kasihan for Cu-Pb-Zn. The strongest Cu-Pb-Zn anomalous values are overlapped at the Kasihan area. The geochemical survey of soil was conducted with the geological survey at the Kasihan area. The statistical values were calculated by the statistical analysis method. The patterns for Cu, Pb and Zn are similar to the normal distribution. The anomalous values of copper-lead-zinc and/or copper and zinc are overlapped at five zones surrounding quartz porphyry at the central part of the Kasihan area. The area was interpreted and chosen as an anomalous zone related with stockwork and skam mineralization, extending to approximately NNW-SSE direction.

탐사 지역인 빠찌딴지역은 인도네시아 자바섬 동부의 남서익부에 위치하며, 주로 중신세 중기의 퇴적암류 및 이들을 관입한 석영반암과 암맥류들로 구성되어 있다. 빠찌딴 지역 내 금속광화작용과 관련된 이상대 및 이를 기초로 광상을 찾기 위하여 하상퇴적물, 중사 및 토양 등을 이용한 지화학 탐사가 지질학적 탐사와 함께 수행되었다. 상기 지화학탐사 결과들을 중합하여 해석한 결과 금뿔 (동), 쩜뽕 (금), 까시한 (동-연-아연) 등의 세 지역이 정밀 조사가 필요한 유망 금속 광화 이상대로 확인되었다 이중 까시한지역은 동-연-아연의 이상치가 가장 강하게 중첩된 지역으로서 정밀 토양 지화학 탐사와 함께 잠두광체 확인을 위한 지질학적 탐사가 수행되었다. 까시한지역에 대한 정밀 토양 지화학탐사 결과에 대한 통계학적 해석 결과 10 곳의 이상대가 확인 되었으며 이 중 5개 이상대는 까시한지역 중앙부 석영반암 관입 분포 지역에 밀집 위치하고 있음이 확인되었다. 이들 이상대는 석영 반암의 관입과 관련된 함 동-연-아연 망상형 맥상 광체 및 스카른형 광체와 관련되어 있음이 확인되었다.

Keywords

Acknowledgement

Supported by : KETEP

References

  1. Katili, J.A. (1975) Volcanism and plate tectonics in the Indonesian islands arcs. Tectonophysics, v.26, p.165-188. https://doi.org/10.1016/0040-1951(75)90088-8
  2. Korea Mining Promotion Corporation (1991) Report on the joint mineral exploration in the Pacitan-Ponorogo area, East Java, Republic of Indonesia, Phase III. 299p.
  3. Korea Mining Promotion Corporation (1992) Report on the joint mineral exploration in the Pacitan-Ponorogo area, East Java, Republic of Indonesia, Phase III. 437p.
  4. Korea Mining Promotion Corporation (1993) Report on the joint mineral exploration in the Pacitan-Ponorogo area, East Java, Republic of Indonesia, Phase III. 255p.
  5. Samodra, H., Gafoer, S. and Tjokrospoetro, S. (1992) Geology of the Pacitan Quadrangle, Jawa: v.1507-4. 1:100000. 17p.
  6. Sinclair, A.J. (1974) Selection of thresholds in geochemical data using probability graphs. J. Geochem. Explor., v.3, p.129-149. https://doi.org/10.1016/0375-6742(74)90030-2
  7. Van Bemmelen, R.S. (1949) The Geology of the Indonesia, v.IA, 1st edition. Govt. Printing Office, The Hague, p.104-136.