Comparison between the geochemical response of BLEG and fine fraction stream sediments to mineralization in the Eastern Black Sea region, Turkey

Yılmaz, Hüseyin; Ghezelbash, Reza; Cohen, David R.; Sarı, Ramazan; Sönmez, Fatma Nuran; Maghsoudi, Abbas

doi:10.1016/j.gexplo.2020.106609

Cited by 9 publications

(3 citation statements)

References 54 publications

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“…Bulk Leach Extractable Gold (BLEG) is considered the most reliable geochemical sampling/survey tool used during exploration for gold (Rose, Hawks and Webb, 1979;Joyce, 1984;Böhmer and Kucera, 1986;Yilmaz et al, 2020). Reproducibility of the geochemical method is good, for instance, as shown by Arne and MacFarlane (2014).…”

Section: Methodsmentioning

confidence: 99%

Lithogeochemical exploration for delineating primary gold occurrences in West Kao area, North Halmahera District, North Maluku Province

Idrus¹,

Fadlin

2021

IMJ

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Halmahera Island retains several gold deposits. One of the gold deposits is called as low sulphidation epithermal (LSE) quartz veins which is currently being mined and is situated in the Gosowong goldfield. The veins mostly originated in N-S and NNE-SSW direction. This study is aimed to determine the prospect area in the northern portion of Gosowong goldfield covering the West Kao sub district based on surface mapping and rock/float- and BLEG stream sediment survey. A total of 16 rock/vein float and 120 BLEG samples were analyzed by FA/AAS and CNO2 cyanide leach methods, respectively. The study area is occupied by tuffaceous sandstone, andesite, porphyritic andesite and lava andesite units. In the eastern part, tuffaceous sandstone is suffered from argillic and propylitic alteration, which may be controlled by the NW-SE-trending structures. The gold grade of rock/float samples is up to 0.044 ppm. BLEG data indicates a calculated threshold of 10 ppb for Au and 72 ppb for Ag. The highest Au and Ag contents (anomalies) are identified in the eastern part of the study area. This is spatially (and maybe genetically) related to the argillic-altered tuffaceous sandstone, structures and occurrences of quartz vein floats. To follow up this finding, a detailed exploration is recommended to be conducted within the prospect area.

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Section: Methodsmentioning

confidence: 99%

Lithogeochemical exploration for delineating primary gold occurrences in West Kao area, North Halmahera District, North Maluku Province

Idrus¹,

Fadlin

2021

IMJ

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“…Another source of systemic uncertainty arises from the absence of a generalized mechanism or model to explain the formation of geochemical patterns observed in media under complex geological conditions (Yilmaz et al., 2020; Zhang et al., 2020; Zhu et al., 2019). Studies have shown that geochemical patterns can exhibit spatial heterogeneity, temporal variability (due to weathering, erosion, and biological activity), threshold effect, complex interactions between elements, and hierarchical dynamics (Agterberg, 2007; Bölviken et al., 1992; Butt, 2005; Cheng, 2012; Olsson et al., 2001).…”

Section: Uncertainty Sources In Geochemical Mappingmentioning

confidence: 99%

Uncertainty Quantification in Geochemical Mapping: A Review and Recommendations

Wang,

Zuo

2024

Geochem Geophys Geosyst

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Geochemical mapping is a crucial tool that can provide valuable insights for a wide range of applications, including mineral resources prospecting, environmental impact assessment, geological process understanding, and climate change research. Despite its significance, geochemical mapping requires spatial modeling based on sparse, heterogeneous, and potentially inaccurate data sets. Moreover, the underlying geological processes are often imperfectly understood. Therefore, uncertainty quantification (UQ) is vital in geochemical mapping to ensure accurate and reliable results, ultimately facilitating well‐informed decision‐making. In this contribution, we distinguish two primary types of uncertainties: systemic and stochastic. We identify the key sources of uncertainties in geochemical mapping and review the techniques that have been employed or hold potential for uncertainty quantification, communication, visualization, and sensitivity analysis. This contribution also illustrates the general procedure of UQ in geochemical mapping by a case study of mapping geochemical anomalies associated with gold mineralization in northwestern Sichuan Province, China. We also explore potential strategies for mitigating the critical uncertainties, such as gathering more geochemical data, developing more effective models, enhancing our understanding of the geochemical dispersion process, or leveraging other thematic information or knowledge. Future research should prioritize addressing underexplored uncertainties and implementing more practical applications to validate the UQ procedure in geochemical mapping.

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“…The region is characterized by basaltic and andesitic agglomerate, tuff, claystone-sandstone-marl alternations, coarse-grained sandstone, and loosely cemented conglomerate near the seacoast. The Upper Cretaceous and Eocene periods were major ore formation periods in the region, with over 120 recorded mineral deposits including Cu-Au, Cu-Mo-(Au), Fe-Au, Au, Ba, Cu, Zn, Ag, Mo, Pb, and Sb, as well as epithermal precious metal deposits [26][27][28].…”

Section: Description Of Sitementioning

confidence: 99%

Environmental Risk Assessment of Combined Radioactive and Chemical Pollution in Soil

Erenturk,

Yusan,

Turkozu

et al. 2023

Rev. Chim.

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The purpose of the study is to define the level of combined radiological and chemical contamination from the activities of soil and moss samples collected from the Eastern Black Sea region in Turkey and to assess the risk caused by the environmental radioactivity and chemical pollutants. The gamma, gross beta and gross alpha activities were measured in the soil and moss samples. The 238U, 232Th, 40K and 137Cs activity concentrations in the soil samples were measured in the range of 7.0 and 72 Bq kg-1 for 238U, 8.1 and 86 Bq kg-1 for 232Th, 203 and 1190 Bq kg-1 for 40K and 0.71 to 66 Bq kg-1 for 137Cs. In the moss samples, the 137Cs, 40K, 232Th, and 238U activity concentrations were found in the range of 1.03�0.27-24.23�1.39, 137�7-1340�68, 3.58�0.32-5.93�0.44 and 0.88�0.09-2.25�0.23 Bq kg-1, respectively. Contamination from toxic metals in the soils is categorized into enrichment factor, geo-accumulation risk, potential ecological risk and pollution load index. Co, Ni, As and Pb enrichments were determined in the extreme category in the 6 sampling sites. The pollution load index for the selected metals was found to be greater than 1. The geo-accumulation index in one sampling site showed contamination from heavy to severe levels of arsenic and lead.

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Comparison between the geochemical response of BLEG and fine fraction stream sediments to mineralization in the Eastern Black Sea region, Turkey

Cited by 9 publications

References 54 publications

Lithogeochemical exploration for delineating primary gold occurrences in West Kao area, North Halmahera District, North Maluku Province

Lithogeochemical exploration for delineating primary gold occurrences in West Kao area, North Halmahera District, North Maluku Province

Uncertainty Quantification in Geochemical Mapping: A Review and Recommendations

Environmental Risk Assessment of Combined Radioactive and Chemical Pollution in Soil

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