Ore Genesis and Minor Elements of Orogenic Gold Deposit at Tamilouw– Haya, Seram Island, Indonesia

Thorium (Th) anomaly was found in Adang Volcanic Complexes, Mamuju Area, West Sulawesi. This element is associated with high-value elements, the rare earth elements (REE). The minerals containing Th and REE were found in veins mineralization with various types of minerals which are very difficult to identify by conventional method. This research aims to understand the distribution and characterization of Th and REE in individual minerals, using Micro X-Ray Fluorescence (µXRF) analysis and completed by Advanced Minerals Identification and Characterization System (AMICS) software. The samples were collected from vein mineralization in Hulu Mamuju Sector. The contents of Th and REE that were analyzed using X-Ray Fluorescence (XRF) completed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) are 11,550-74,480 ppm and 6,244.15-48,036.87 ppm, respectively. The minerals that contain Th and REE are britholite ((Ce,Ca) 5 (SiO 4 ) 3 OH), aeschynite (Ce,Ca,Fe,Th)(Ti,Nb) 2 (O,OH) 6 , cerite (Ce,Ca) 9 (Mg,Fe)(SiO 4 ) 3 (HSiO 4 ) 4 (OH) 3 , monazite (REE,Th(PO 4 )), thorite (Th(SiO 4 )), and thorutite (Th,U,Ca)Ti 2 (O,OH) 6 associated with other minerals such as pyrite, actinolite, apatite, ilmenite, hematite, zircon and ankerite. Some minerals are uncommon minerals and are only characterized by detailed elemental mapping. The variety of minerals shows the condition of mineralization influenced by carbonatite magma and the hydrothermal process of mineralization.

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“…All the analyses in this study were carried out at a 20 mbar vacuum. The sample width was 2 × 2 cm (by 20 pixels) [29][30][31].…”

Section: Legendmentioning

confidence: 99%

Elemental Mapping for Characterizing of Thorium and Rare Earth Elements (REE) Bearing Minerals Using µXRF

et al. 2022

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“…2022, 55 (2C), 1-13 The hydrothermal alteration at Mendoke Mountains closely related to the presence of mineralization. Gold-bearing quartz veins are found in mica schist, actinolite schist, graphite schist and chlorite schist which are petrologically classified as greenschist facies and become host rocks of orogenic gold deposits (Groves, 1993;Gebre-Mariam et al, 1995;Groves et al, 1998;Goldfarb et al, 1998;2001;Idrus et al, 2012;Idrus et al, 2014;Goldfarb and Groves, 2015;Hasria et al, 2017;Samalehu et al, 2021). The characteristics of hydrothermal alteration in these altered rocks serve to character indicate the character and presence of the more focused ore deposits (Best, 2003).…”

Section: Carbonization Alterationmentioning

confidence: 99%

“…Gold in Indonesia is not only explored in volcanic and magmatic arcs, but also in sedimentary and metamorphic belts (Hasria et al, 2019). Many current discoveries of gold deposits with hosted metamorphic rocks such as Buru and Seram Islands orogenic gold deposits, in Mollucas (Idrus et al, 2014;Samalehu et al, 2021); LS-epithermal at Poboya, Central Sulawesi (Syafrizal et al, 2017); mesothermal at Awak Mas, South Sulawesi (Querubin and Walters, 2011) and orogenic gold deposits at Rumbia Mountains, Southeast Sulawesi (Idrus et al, 2012;Hasria et al, 2019). One of the most important types of gold resources in metamorphic belts that are formed by orogenic processes and contain more than half of the world's gold production ore is orogenic gold deposits (Goldfarb et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The Quartz Veins, Hydrothermal Alteration and Ore Mineralization of Orogenic Gold Deposit at Mendoke Mountains, Southeast Sulawesi, Indonesia

Hasria

Idrus

Warmada

2022

IGJ

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The research at Mendoke Mountains, Southeast Sulawesi Province, particularly for the study of gold deposits, becomes a new challenge because there is no previous detailed study. This study aims to analyze the characteristics of orogenic gold deposits, which include the type and texture of quartz veins, alteration and hydrothermal mineralization with hosted metamorphic rocks. The research methods used include fieldwork and laboratory analysis. The type and texture of quartz veins were identified based on the field observations. The hydrothermal alteration was analyzed using X-ray diffraction analysis, and hydrothermal mineralization which analyzed by ore microscopy. The results showed that there are three types of quartz veins parallel and crosscut to the direction of foliation, and laminated quartz veins. The quartz veins’ texture is deformed, segmented, brittle, sheared, laminated, sheeted, irregular veins, brecciated, massive and sigmoidal. The hydrothermal alteration consists of sericitization, argillic, propylitic and carbonization alterations. The hydrothermal mineralization consists of native gold, chalcopyrite, pyrite, stibnite, covellite, cinnabar, galena, arsenopyrite, chrysocolla, magnetite, hematite and goethite. The host rock of gold mineralization in the study area is classified into the greenschist facies. Based on these characteristics, it shows that gold deposits in the Mendoke Mountains are orogenic gold deposits.

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Ore Genesis and Minor Elements of Orogenic Gold Deposit at Tamilouw– Haya, Seram Island, Indonesia

Cited by 2 publications

References 24 publications

Elemental Mapping for Characterizing of Thorium and Rare Earth Elements (REE) Bearing Minerals Using µXRF

Elemental Mapping for Characterizing of Thorium and Rare Earth Elements (REE) Bearing Minerals Using µXRF

The Quartz Veins, Hydrothermal Alteration and Ore Mineralization of Orogenic Gold Deposit at Mendoke Mountains, Southeast Sulawesi, Indonesia

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