40Ar/39Ar geochronology of the Pongkor low sulfidation epithermal gold mineralisation, West Java, Indonesia

Titisari, Anastasia Dewi; Phillips, David; Warmada, I Wayan; Hartono, Hartono; Idrus, Arifudin

doi:10.1016/j.oregeorev.2020.103341

Cited by 3 publications

(5 citation statements)

References 31 publications

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“…Referring to the regional geological map [5] and [2], the dioritic rocks of the studied area is equivalent as intrusive rock of the Middle -Late Miocene Epoch that is produced in relation to the Late Oligocene-Late Miocene magmatism of Kulon Progo Mountains as the result the Early Tertiary-Quaternary subduction. [15] of studied area in comparison to previous study [17].…”

Section: Geochemical Analysismentioning

confidence: 76%

Section: Geochemical Analysismentioning

confidence: 99%

“…The Th/Yb-Nb/Y diagram from [17] is shown on Figure 10. As it is explained by [18] in [17], the increasing of Th/Nb and Nb/Y ratios within the magmatic suites play a crucial role in indicating the enrichment of these incompatible elements as the arc evolves. The Th/Nb-Nb/Y plots values of the studied area samples fall within the intermediate range of Nb/Y (0,10 -0,25), Th/Nb (0,84 -1,1).…”

Section: Geochemical Analysismentioning

confidence: 99%

“…It indicates that the dioritic intrusion of the studied area exhibit characteristics representing an arc system, namely a mature arc. Data from [17] is also shown in the diagram (Figure 10) as a comparison and it is plotted within the mature arc field and evolved arc.…”

Section: Geochemical Analysismentioning

confidence: 99%

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Characteristics of Dioritic Intrusion at Kaligono Area, Kulon Progo Mountains, Indonesia: A Preliminary Study for Petrogenesis Implications

Dwi Astuti,

Dewi Titisari,

Idrus

2024

IOP Conf. Ser.: Earth Environ. Sci.

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This study defines the characteristics of dioritic rock intrusion in the Kaligono area, Kulonprogo Mountains, Indonesia. Previous studies suggest the existence of porphyry deposit system in the mentioned area, hosted by the dioritic intrusion. According to the Geologic Map of Yogyakarta Quadrangle, age of the dioritic intrusion is the Miocene. Study of the intrusion characteristics is very important to gain a better understanding of the geological model associated with the deposit system. This preliminary study focused on determining petrogenesis of the dioritic intrusion. Methods carried out in this study were field data collection, petrographic analysis, and geochemical analysis using ICP-AES (Inductive Coupled Plasma-Atomic Emission Spectrometry) and ICP-MS (Inductively Coupled Plasma Mass Spectrometry) analysis. Petrography analysis showed that igneous rocks in this research area consist of dioritic rock with phorphyritic texture and oscillatory zoning. Based on its geochemical composition, the rock samples can be classified as diorite and granodiorite and calc-alkaline suites. These rocks are enriched in LILEs (Rb, Ba, Sr, and K) and depleted in HFSEs (Nb, Ti, Zr). In addition, REE shows a slight enrichment of light-REE and depletion of HREE. These patterns of the trace elements including REE show a typical pattern of calc alkaline arc. Petrographic observation and geochemical variation indicate that the magma has undergone fractional crystallization.

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Section: Geochemical Analysismentioning

confidence: 76%

Section: Geochemical Analysismentioning

confidence: 99%

Section: Geochemical Analysismentioning

confidence: 99%

Section: Geochemical Analysismentioning

confidence: 99%

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Characteristics of Dioritic Intrusion at Kaligono Area, Kulon Progo Mountains, Indonesia: A Preliminary Study for Petrogenesis Implications

Dwi Astuti,

Dewi Titisari,

Idrus

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The model is expected to be a guideline in surface radiometric mapping for gold exploration to increase the success potential. The typical LS epithermal gold deposit of the Pongkor deposit in West Java was chosen because of its well-known geological condition due to the extensive studies that have been conducted for years in terms of supergeneenriched epithermal, study of carbonate minerals, geochronology, and ore-forming fluid (Figure 1) [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Radiometric Signatures of Gold Mineralization Zone in Pongkor, West Java, Indonesia: A Baseline for Radiometric Mapping Application on Low-Sulfidation Epithermal Deposit

Syaeful,

Ciputra,

Adimedha

et al. 2023

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Radiometric mapping could play a prominent role in locating the host rock or alteration that leads to gold mineralization. Nevertheless, in low-sulfidation epithermal gold deposits, the radiometric signatures have to be priorly characterized due to their geometry. It is comprised of a small ore vein system within the large alteration zones. The Pongkor gold mine is a low-sulfidation epithermal deposit and was selected for this purpose. The method started with the surface identification of radiometric signatures on altered and unaltered rocks near Pongkor using portable spectrometers. They are followed by the characterization of the underground mining front, which is comprised of different types of veins and host rocks. The results show that the altered rocks were characterized by a high K% and a low eTh/K ratio. Vice versa, the mineralized veins show low radioelement concentrations. Following the characterization of the geometry of alteration zones and mineralized veins, a study of the relationship between radioelements detected by radiometric mapping and gold pathfinder elements was conducted. Gold pathfinders of Mn, Fe, Zn, As, and Pb were selected for correlation studies with the radioelement. The pathfinders and radioelements were more significantly correlated in veins compared to the host rock. Based on this study, radiometric mapping has the potential and benefit of being applied in the exploration of low-sulfidation epithermal gold deposits. An alteration zone could be delineated by K or eTh/K as an anomaly indicator, and the vein bodies could also be delineated using low K or eTh as an anomaly indicator.

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Preface for the special issue “Magmatism, tectonic evolution and metallogenesis in SE Asia and the adjacent region”

Yang

Zaw

Ghani

2021

Ore Geology Reviews

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40Ar/39Ar geochronology of the Pongkor low sulfidation epithermal gold mineralisation, West Java, Indonesia

Cited by 3 publications

References 31 publications

Characteristics of Dioritic Intrusion at Kaligono Area, Kulon Progo Mountains, Indonesia: A Preliminary Study for Petrogenesis Implications

Characteristics of Dioritic Intrusion at Kaligono Area, Kulon Progo Mountains, Indonesia: A Preliminary Study for Petrogenesis Implications

Radiometric Signatures of Gold Mineralization Zone in Pongkor, West Java, Indonesia: A Baseline for Radiometric Mapping Application on Low-Sulfidation Epithermal Deposit

Preface for the special issue “Magmatism, tectonic evolution and metallogenesis in SE Asia and the adjacent region”

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