Geochemical characteristics of hydrothermally altered black shales of the southern Oquirrh Mountains and relationships to Mercur type gold deposits

1989 ◽  
Keyword(s):  
Gold Deposits ◽  
Black Shales ◽  
Geochemical Characteristics

Mineralogical-geochemical characteristics of gold deposits developed at shallow depths

1973 ◽  
Vol 15 (7) ◽  
pp. 784-790 ◽  
Author(s):  
Yu.S. Berman ◽  
G.P. Volarovich ◽  
A.I. Kazarinov
Keyword(s):  
Gold Deposits ◽  
Geochemical Characteristics

Geochemical characteristics of black shales from Triassic turbidites, Peninsular Malaysia: Implications for their origin and tectonic setting

2020 ◽  
Vol 113 ◽  
pp. 104137 ◽  
Author(s):  
Hassan Baioumy ◽  
Bernd Lehmann ◽  
Ahmed Mohamed Ahmed Salim ◽  
Khaled Al-Kahtany ◽  
Abdelbaset El-Sorogy
Keyword(s):  
Tectonic Setting ◽  
Peninsular Malaysia ◽  
Black Shales ◽  
Geochemical Characteristics

scholarly journals Organic geochemical characteristics of black shales across the Ordovician–Silurian boundary in the Holy Cross Mountains, central Poland

2015 ◽  
Vol 66 ◽  
pp. 1042-1055 ◽  
Author(s):  
Karwan A. Mustafa ◽  
Mark A. Sephton ◽  
Jonathan S. Watson ◽  
Fivos Spathopoulos ◽  
Piotr Krzywiec
Keyword(s):  
Black Shales ◽  
Geochemical Characteristics ◽  
Holy Cross Mountains ◽  
Central Poland

scholarly journals The Neglected Involvement of Organic Matter in Forming Large and Rich Hydrothermal Orogenic Gold Deposits

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 344
Author(s):  
Damien Gaboury
Keyword(s):  
Organic Matter ◽  
Gold Deposits ◽  
Black Shales ◽  
Orogenic Gold ◽  
Redox Activity ◽  
Bacterial Reduction ◽  
Orogenic Gold Deposits ◽  
Three Stages ◽  
Gold Bearing

Orogenic gold deposits have provided most of gold to humanity. These deposits were formed by fluids carrying dissolved gold at temperatures of 200–500 °C and at crustal depths of 4–12 km. The model involves gold mobilization as HS− complexes in aqueous solution buffered by CO2, with gold precipitation following changes in pH, redox activity (fO2), or H2S activity. In this contribution, the involvement of carbonaceous organic matter is addressed by considering the formation of large and/or rich orogenic gold deposits in three stages: the source of gold, its solubilization, and its precipitation. First, gold accumulates in nodular pyrite within carbonaceous-rich sedimentary rocks formed by bacterial reduction of sulfates in seawater in black shales. Second, gold can be transported as hydrocarbon-metal complexes and colloidal gold nanoparticles for which the hydrocarbons can be generated from the thermal maturation of gold-bearing black shales or from abiotic origin. The capacity of hydrocarbons for solubilizing gold is greater than those of aqueous fluids. Third, gold can be precipitated efficiently with graphite derived from fluids containing hydrocarbons or by reducing organic-rich rocks. Black shales are thus a key component in the formation of large and rich orogenic gold deposits from the standpoints of source, transport, and precipitation. Unusual CO2-rich, H2O-poor fluids are documented for some of the largest and richest orogenic gold deposits, regardless of their age. These fluids are interpreted to result from chemical reactions involving hydrocarbon degradation, hence supporting the fundamental role of organic matter in forming exceptional orogenic gold deposits.

Geochemical characteristics of the Paleogene-Neogene coals and black shales from Malaysia: Implications for their origin and hydrocarbon potential

2018 ◽  
Vol 51 ◽  
pp. 73-88 ◽  
Author(s):  
Hassan Baioumy ◽  
Ahmed Mohamed Ahmed Salim ◽  
Mohd Hariri Arifin ◽  
Mohammad Noor Akmal Anuar ◽  
Ali Abdullah Musa
Keyword(s):  
Black Shales ◽  
Geochemical Characteristics ◽  
Hydrocarbon Potential

scholarly journals Geochemical characteristics of the Silurian-Devonian Kroh black shales, Peninsular Malaysia: An implication for hydrocarbon exploration

2021 ◽  
pp. 106891
Author(s):  
Monera Adam Shoieb ◽  
Haylay Tsegab Gebretsadik ◽  
Omeid Rahmani ◽  
Mohd Suhaili Ismail ◽  
Syed Muhammad Ibad
Keyword(s):  
Peninsular Malaysia ◽  
Black Shales ◽  
Geochemical Characteristics ◽  
Hydrocarbon Exploration
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