GEOLOGI DAN ANALISIS HUBUNGAN KADAR UNSUR LOGAM BERDASARKAN ASPEK RASIO UNSUR PADA ENDAPAN EPITERMAL SULFIDASI MENENGAH LAPANGAN “SAKTI”, KABUPATEN SUMBAWA BARAT NUSA TENGGARA BARAT

SAKTI (2023) GEOLOGI DAN ANALISIS HUBUNGAN KADAR UNSUR LOGAM BERDASARKAN ASPEK RASIO UNSUR PADA ENDAPAN EPITERMAL SULFIDASI MENENGAH LAPANGAN “SAKTI”, KABUPATEN SUMBAWA BARAT NUSA TENGGARA BARAT. Other thesis, UPN "Veteran" Yogyajarta.

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Abstract

GEOLOGI DAN ANALISIS HUBUNGAN KADAR UNSUR
LOGAM BERDASARKAN ASPEK RASIO UNSUR PADA
ENDAPAN EPITERMAL SULFIDASI MENENGAH
LAPANGAN “SAKTI”, KABUPATEN SUMBAWA BARAT
NUSA TENGGARA BARAT
SARI
Beta Octana Sakti
111190048
Daerah penelitian berada di kawasan PT. Sumbawa Barat Mineral, Kabupaten
Sumbawa Barat, Nusa Tenggara Barat. Penelitian ini bertujuan untuk mengetahui
hubungan antara unsur logam dengan kondisi geologi dan alterasi serta hubungan
antar unsur logam itu sendiri menggunakan analisis korelasi rasio unsur. Metode
Penelitian yang dilakukan dalam penelitian ini terdiri atas studi pustaka, pengambilan
data geologi permukaan, analisis dan pengolahan data menggunakan Petrografi,
Mineragrafi, XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence), dan studi kasus
menggunakan analisis statistik rasio unsur.
Pola pengaliran pada daerah penelitian terbagi atas pola pengaliran Trellis
(TRL), pola pengaliran Subtrellis (STR), dan pola pengaliran Subdendritik (SDN)
yang terbentuk pada lima macam bentuk lahan geomorgologi berupa Bentuk lahan
Lereng Struktural (S1), Bentuk lahan Lembah Struktural (S2), Bentuk lahan
Perbukitan Karst (K1), Bentuk lahan Dataran Alluvial (F1), Bentuk lahan Tubuh
Sungai (F2).
Stratigrafi pada daerah penelitian dari tua ke muda tersusun oleh Satuan breksi-
tuf Jereweh berumur Miosen Awal - Miosen Tengah, Satuan batugamping Jereweh
berumur Miosen Akhir - Pliosen, dan Satuan Endapan Aluvial berumur Kuarter.
Struktur geologi daerah penelitian terdiri atas sesar mendatar yang terbagi atas
empat jenis yang didasarkan pada orientasi dan arah pergerakannya, yakni Sesar
Mendatar Kanan Orde 1 (barat laut - tenggara), Sesar Mendatar Kiri Orde 1 (Timur
Laut - Barat Daya), Sesar Mendatar Kanan Orde 2 (Barat Barat Laut - Timur
Tenggara dan Utara Timur Laut - Selatan Barat Daya), Sesar Mendatar Kiri Orde 2
(Barat Barat Daya - Timur Timur Laut dan Utara Barat Laut - Selatan Tenggara) dan
kekar yang terbentuk pada sistem dilatational jogs.
Alterasi yang berkembang di daerah penelitian terbagi menjadi Alterasi Silisik
(Kuarsa), Alterasi Argilik Tingkat Lanjut (Kuarsa+ llit + Kaolinit + Pirofilit),
Alterasi Argilik (Kaolin + Ilit + Kuarsa ± Montmormilonit), Alterasi Propilitik
(Klorit + Smektit + Kuarsa) dengan mineralisasi pada sistem urat berekstur
Colloform, Crustiform, Pengisian Kuarsa, Dogteeth, Kuarsa Kalsedonik, Kuarsa
Masif, Kuarsa Kristalin, Mozaik, dan Sakaroidal berasosiasi dengan struktur kekar-
kekar tarik pada sistem dilatational jogs dengan mineral bijih berupa Pirit (FeS₂),
Kalkopirit (CuFeS₂), Galena (Pbs), Sfalerit ((Zn,Fe)S), Kalkosit (Cu₂S), Kovelit
(CuS).
Pengkayaan unsur logam pada daerah penelitian memiliki asosiasi dengan
litologi dan alterasi tertentu, dimana logam berharga (precious metal) berupa Cu, Au,
dan Ag cenderung terkayakan pada litologi permeabel pada Satuan breksi-tuf
Jereweh dengan kadar tinggi cenderung berasosiasi pada alterasi silisik. Logam dasar
(base metal) juga paling tinggi terkayakan pada jenis litologi dan alterasi yang sama
seperti logam berharga, namun juga ditemukan pengkayaan yang hampir rata pada
litologi batugamping fragmen koral dan alterasi-alterasi lain yang terbentuk.
Hubungan antar unsur logam pada daerah penelitian, meliputi unsur Au
memiliki korelasi negatif dengan unsur Cu, Ag, dan Pb, serta memiliki korelasi
positif dengan unsur Zn. Unsur Cu memiliki korelasi negatif dengan unsur Ag, seta
memiliki korelasi positif dengan unsur Pb dan Zn. Unsur Ag memiliki korelasi positif
dengan unsur Pb, serta memiliki korelasi negatif dengan unsur Zn. Unsur Pb
memiliki korelasi negatif dengan unsur Zn.
Kata Kunci : Alterasi, Epitermal Sulfidasi Menengah, Geologi, Mineralisasi,
Rasio Unsur
GEOLOGY AND ANALYSIS OF RELATIONSHIPS BASED ON
ASPECTS OF ELEMENT RATIO IN EPITHERMAL
INTERMEDIATE SULPHIDATION DEPOSITS “SAKTI
FIELD”, SUMBAWA REGENCY, WEST NUSA TENGGARA
ABSTRACT
Beta Octana Sakti
111190048
The research area is in the area of PT Sumbawa Barat Mineral, West Sumbawa
Regency, West Nusa Tenggara. This study aims to determine the relationship
between metal elements with geological conditions and alteration and the
relationship between the metal elements themselves using element ratio correlation
analysis. The research method used in this study consisted of a literature study,
surface geology data collection, data analysis and processing using Petrography,
Mineragraphy, XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence), and case
studies using statistical analysis of element ratios.
Drainage patterns in the study area are divided into Trellis drainage patterns
(TRL), Subtrellis drainage patterns (STR), and Subdendritic drainage patterns
(SDN) which are formed in five types of geomorphological landforms in the form of
Structural Slope Landforms (S1), Structural Valley Landforms (S2), Karst Hills
Landform (K1), Alluvial Plain Landform (F1), River Body Landform (F2).
The stratigraphy in the study area from old to young is composed of the
Jereweh breccia-tuff Unit of Early Miocene - Middle Miocene age, the Jereweh
limestone unit of Late Miocene - Pliocene age, and the Quaternary age Alluvial
Deposit Unit.
The geological structure of the study area consists of horizontal faults which
are divided into four types based on their orientation and direction of movement,
namely Order 1 Right Slip Fault (northwest-southeast), Order 1 Left Slip Fault
(Northeast - Southwest), Right Slip Fault Order 2 (West Northwest - East Southeast
and North Northeast - South West Southwest), Order 2nd Left Slip Fault (West
Southwest - East Northeast and North Northwest - South East) and fractures formed
in the dilatational jogs system.
The Alteration that develops in the study area is divided into Silicic Alteration
(Quartz), Advanced Argillic Alteration (Quartz + llite + Kaolinite + Pyrophyllite),
Argillic Alteration (Kaolin + Illite + Quartz ± Montmormilonite), Propylitic
Alteration (Chlorite + Smectite + Quartz) with mineralization in colloform,
crustiform, quartz filling, dogteeth, chalcedonic quartz, massive quartz, crystalline
quartz, mosaic, and saccharoidal textures associated with tension joint structures in
the dilatational jogs system with ore minerals in the form of pyrite (FeS₂),
chalcopyrite (CuFeS₂), Galena (Pbs), Sphalerite ((Zn,Fe)S), Chalcocite (Cu₂S),
Covelite (CuS).
The enrichment of metal elements in the study area is associated with certain
lithology and alteration, where precious metals in the form of Cu, Au, and Ag tend
to be enriched in permeable lithology in breccia-tuff unit with high grades tend to be
associated with silicic alteration. The base metal is also the highest enriched in the
same lithology and alteration types as the precious metals. Still, an almost uniform
enrichment is also found in the coralline limestone and other alterations that are
formed.
The relationship between metal elements in the study area, including the
element Au, has a negative correlation with the elements Cu, Ag, and Pb, and has a
positive correlation with the element Zn. The Cu element has a negative correlation
with the Ag element, and has a positive correlation with the Pb and Zn elements. The
Ag element has a positive correlation with the Pb element, and has a negative
correlation with the Zn element. Pb element has a negative correlation with Zn
element.
Keywords : Alteration, Epithermal Sulfidation Intermediate, Geology,
Mineralization, Element Ratio.

Item Type: Thesis (Other)
Uncontrolled Keywords: Alteration, Epithermal Sulfidation Intermediate, Geology, Mineralization, Element Ratio.
Subjects: Q Science > QE Geology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Eko Yuli
Date Deposited: 27 Sep 2023 04:08
Last Modified: 27 Sep 2023 04:08
URI: http://eprints.upnyk.ac.id/id/eprint/37718

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