MINERALISASI BIJIH DAN KARAKTERISTIK LARUTAN HIDROTERMAL PADA ENDAPAN EPITERMAL LOGAM DASAR DI BUONG BARU, KECAMATAN SESAYAP HILIR, KABUPATEN TANA TIDUNG, PROVINSI KALIMANTAN UTARA, INDONESIA
Research area has a potential base-metal deposit. This area is located at Buong Baru district western of Tarakan Island. Some researched suggest that this region has potential for lead and zinc deposit. Another research of geological survey mentions that there are some mineral alteration indication...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2013
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/123772/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=63886 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Research area has a potential base-metal deposit. This area is located at
Buong Baru district western of Tarakan Island. Some researched suggest that
this region has potential for lead and zinc deposit. Another research of
geological survey mentions that there are some mineral alteration indication
which may be related mineralization. Therefore, exploration in this area may
become important. One of this exploration subject is to understanding the
genetic of the deposit which needed for understanding further examination.
This research is aimed to understand ore mineralization and
hydrothermal fluid characteristics of epithermal deposit in research area. For
this purpose, geological study analysis, ore mineralogical observation, and fluid
inclusion study is aimed for collecting data. Further, compilation of this
examination used to build genetic model of this area, especially for fluid
evolution.
Interpretation of those data indicates that hydrothermal fluid consist of
two phase hypogen deposition. On early phase, deposition take place at
temperature of 265 � 300
o
C which lead to deposition of galena, chalcopyrite,
sphalerite and pyrite. On last phase, deposition of pyrite, sphalerite, covellite,
and gold occur at 240 � 265
o
C.
Hydrothermal fluid also indicates a mixing condition which shown by
general trend of homogenization temperature-salinity graphic plot. This mixing
is interpreted as mixing both magmatic fluids with meteoric water. In the
development of mixing phase, meteoric water become dominated which
indicated by low salinity of trapped fluids. This fluid mixing condition may act
as the key of this deposit which is circulated in epithermal intermediate-
sulfidation system |
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