The late Miocene Öksüt high sulfidation epithermal Au-Cu deposit, Central Anatolia, Turkey: Geology, geochronology, and geochemistry

Aluç, Ali; Kuşcu, İ̇lkay; Peytcheva, Irena; Cihan, M.; Quadt, Albrecht von

doi:10.1016/j.oregeorev.2020.103795

Cited by 9 publications

(3 citation statements)

References 79 publications

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“…Meanwhile, covellite, magnetite, sphalerite, and garnet were found only slightly at the sampling station. This mineral composition indicates that the source of the placer deposits at the study site is epithermal low sulfidation or epithermal high sulfidation (Aluç et al, 2020;Burkett et al, 2015;Enríquez et al, 2018;Idrus and Handayani, 2017;Pratomo et al, 2021;Purwanto et al, 2018;Syafrizal et al, 2017;Villaplaza et al, 2017;Wahyudi, 2011). Although Augrain visually on microscope present only on 1 station it could be cause the location is quite near of mineralization so the Au-grain is still in very fine grain size which it's hard to identify through microscope beside that the Au-grain might be still trapped in carrier mineral is the other reason Au-grain doesn't appear on ore petrography but appear on chemistry analysist.…”

Section: Discussionmentioning

confidence: 84%

Section: Ore Petrographymentioning

confidence: 84%

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Analysis of Grain Morphology, Mineral Composition, and Ore Grade on Gold Placer Deposits in Bantimurung, Pangkep Regency, South Sulawesi, Indonesia

Irfan

Husain

Nur

2022

J. Geoscience Eng. Environ. Technol.

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The information through social media shows that there is quite an intense placer mining activity by local residents in the Bantimurung area, Tondong Tallasa District, Pangkep Regency. This study as a preliminary research aims to determine the grain morphology characteristics of mineral composition and metal grade in gold placer deposits in the study area. The data collected were eight samples. The collected samples were prepared into thin section, polished and observed using a microscope to identify the mineral composition and grain morphology. The grades of Au metal and its associated metals consisting of Ag, Zn, Pb, and Cu in the placer samples were analyzed by the AAS method. Petrography shows abundant of quartz, plagioclase, biotite and pyroxene minerals it might be indication of mineralization of epithermal. Ore petrography shows pyrite present along the river, silver is also found quite a lot along the river. Meanwhile, covellite, magnetite, sphalerite, and garnet were found only slightly at the sampling station this mineral composition indicates that the source of the placer deposits was epithermal. The grain morphology of the thin-section observation shows that quartz dominant has a high sphericity with character of roundness tends to be very angular to sub-rounded from upstream to downstream of the river. Plagioclase tends to have sub rounded roundness and high sphericity. Biotite tends to have a high sphericity with roundness from upstream to downstream is very angular, then angular, then sub-rounded. Pyroxenes tend to have high sphericity with very angular and angular roundness. Au content is directly proportional to Cu and inversely proportional to Zn, Pb, and Ag. Statistically Au affects the content of Cu by 50.97%. It can be concluded that Au is genetically associated with Cu, however Au grains that were still attached to the mineral and had not been separated from other minerals so that it could not be seen visually. This can also indicate that the source of this placer deposit is not far from the study site. Au grade corelated with stream sediment types it is 97,86 ppm for channel bar and 94,16 ppm for point bar, based on this we conclude the downstream has higher grade of Au compare to the upstream.

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Section: Discussionmentioning

confidence: 84%

Section: Ore Petrographymentioning

confidence: 84%

Analysis of Grain Morphology, Mineral Composition, and Ore Grade on Gold Placer Deposits in Bantimurung, Pangkep Regency, South Sulawesi, Indonesia

Irfan

Husain

Nur

2022

J. Geoscience Eng. Environ. Technol.

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“…The felsic maars have also various imprints of the AFC in their whole-rock compositions (Figures 11 and 12 and Supplementary Figure S6). The aphyric rhyolites can be formed through 70-80% crystal fractionation of the calcalkaline Develi (NE of CAVP) basaltic andesite (~6 Ma; Aluç et al, 2020), which is suggested to represent some crustal contamination (~10-20%) by the basement granites (e.g., Terlemez granitoids; Yalınız et al, 1999) (Figure 12E). In our crystallization model, the modal proportions of feldspars are higher (60-70%) than the mafic phases (5-10%).…”

Section: Magma Source Characteristicsmentioning

confidence: 99%

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

et al. 2022

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Recent experiments have largely reshaped our knowledge of maar volcanism. A new evolutionary model promoting the role of explosion depth and vent migration during the formation of maars has provided an alternative approach to previous models. Despite a few attempts to test this model with real cases, there is still a need for field-based studies exploring the depositional characteristics of maars to better understand the factors affecting the model constraints. More investigations on less known felsic maars are required to elucidate the possible differences from their more common mafic counterparts. Here, we explore compositionally distinct monogenetic clusters within the Acıgöl caldera (NW of Central Anatolian Volcanic Province, CAVP), with four felsic maars (İnallı, Kalecitepe, Acıgöl, and Korudağ) and one mafic maar (İcik). Our field observations reveal a successive formation between rhyolitic maars and adjacent lava domes. The mugearitic İcik coalescent maar and the adjacent scoria cone are synchronously formed, which is disclosed by the intercalation of the maar and scoria cone deposits. The geochemistry of the maar juveniles suggests a parental basaltic magma source that has been possibly differentiated by varying degrees of fractional crystallization. Our findings identify the main factors in maar formation (i.e., optimum scaled depth-OSD, water-magma interaction, and basement lithology). We also determine some differences between the felsic and mafic maars in the region, such as higher juvenile content, less amount of sedimentary structure, and a clear transition from phreatomagmatic to magmatic explosions through the end of stratigraphy. All these reflect the complexity of maars, mainly formed by different depths of explosions that occurred in the shallowest few hundred meters rather than a systematic incremental decrease of the eruption locus. Further geophysical and geochronological studies will complete our proposed evolutionary model for the youngest monogenetic activity in the Acıgöl caldera that would also warrant volcanic hazard assessment due to the presence of low-velocity anomalies, shallow Curie depths, and prevalent geothermal activity.

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Mineralogy, fluid inclusion and stable isotope characteristics of the Inlice (Konya, Turkey) high sulfidation epithermal gold deposit: Implications for hydrothermal evolution and ore genesis

Terzi,

Yılmazer,

Kuşcu

et al. 2024

Geochemistry

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The late Miocene Öksüt high sulfidation epithermal Au-Cu deposit, Central Anatolia, Turkey: Geology, geochronology, and geochemistry

Cited by 9 publications

References 79 publications

Analysis of Grain Morphology, Mineral Composition, and Ore Grade on Gold Placer Deposits in Bantimurung, Pangkep Regency, South Sulawesi, Indonesia

Analysis of Grain Morphology, Mineral Composition, and Ore Grade on Gold Placer Deposits in Bantimurung, Pangkep Regency, South Sulawesi, Indonesia

New findings on compositionally distinct maar volcanoes: A case study from Acıgöl (Nevşehir) caldera (Central Anatolia, Turkey)

Mineralogy, fluid inclusion and stable isotope characteristics of the Inlice (Konya, Turkey) high sulfidation epithermal gold deposit: Implications for hydrothermal evolution and ore genesis

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