Distribution and Origin of Clay Minerals During Hydrothermal Alteration of Ore Deposits

René, Miloš

doi:10.5772/48312

Clay Minerals in Nature - Their Characterization, Modification and Application 2012

DOI: 10.5772/48312

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Distribution and Origin of Clay Minerals During Hydrothermal Alteration of Ore Deposits

Miloš René¹

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2021

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“…Previous research shows that alumina also plays a role in concentrating Sn by adsorption of Sn to clay particles, which is a common feature in sedimentary rocks [43]. Additionally, research on the Sn-W and U deposits in the Central European Variscan Belt (Bohemian Massif) had indicated that Sn mineralization was commonly associated with the clay mineral assemblage [44]. Therefore, correlation among alumina, organic carbon and trace elements can be used to assert controls on deposition of some trace elements into sedimentary basins.…”

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Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

et al. 2021

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Major trace element analyses, including pyrite chemistry of pyritic mudstones of shallow-marine Singa Formation of Pennsylvanian–Early Permian age have been carried out to assess gold potential, the source of sulfur and organic matter. Regionally, Singa Formation spatially correlates with the Bohorok Formation (Sumatra, Indonesia), the Kaeng Krachang group (Thailand), and the Lebyin group (Burma or Myanmar). In Southeast Asia, this formation is important because it has a record of glacial processes that occurred along the northern margin of Gondwana in the Late Paleozoic age. This study has revealed that mudstones of the Singa Formation, which contain lonestones of glacial origin, deposited under suboxic–oxic conditions in shallow marine environment during Pennsylvanian–Early Permian time. The black mudstones contain total organic carbon which ranges from 0.1 to 0.7 wt.%, and gold content varying from 40 to 62 ppb, making them gold source rocks. This study has revealed diagenetic gold presence in the early pyrite generations (pyrites 1, 2, and 3) in these mudstones with gold content ranging up to 1.6 ppm Au which is indicative of early enrichment of gold. Conversely, late generations of pyrite (pyrites 4, 5, and 6) in these mudstones record low gold content up to 0.5 ppm Au. The δ34S values for pyrite grains range from −24.6‰ to + 6.2‰ likely indicate a combination of magmatic and biogenic source of sulfur. Organic carbon isotope composition of the pebbly mudstone samples shows a wide range from −23.9‰ to −5.8‰ indicating a mixed terrestrial and marine source.

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Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

et al. 2021

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Distribution and Origin of Clay Minerals During Hydrothermal Alteration of Ore Deposits

Cited by 1 publication

References 17 publications

Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

Geochemistry of Pyritic Mudstones from the Singa Formation, Malaysia: Insights into Gold Potential, Source of Sulfur and Organic Matter

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