Introduction to geochemistry of metalliferous black shales

Meyers, Philip A.; Pratt, Lisa M.; Nagy, Bartholomew

doi:10.1016/0009-2541(92)90027-3

Cited by 21 publications

(11 citation statements)

References 7 publications

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“…Although organic matter has been documented from some gold deposits, its role in the genesis of gold mineralization is the subject of ongoing debate (Springer 1985;Mastalerz et al 2000;Bierlein et al 2001;Craw 2002;Pitcairn et al 2005;Król et al 2009). One of the mechanisms could be explained by the association of gold with the sulfidised organic matter (Meyers et al 1990). Organic material in the form of total organic carbon is reported from Kundarkocha gold deposit in this research work.…”

Section: Introductionmentioning

confidence: 52%

“…Commonly gold occurrences that are associated with organic carbonaceous and graphitic material have been reported from Paleozoic, Mesozoic, and Tertiary periods (Springer 1985;Mastalerz et al 2000;Bierlein et al 2001;Craw 2002;Pitcairn et al 2005;Williams 2007). Black shale rock complexes are considered to have great potential as host rocks of noble metals (Meyers et al 1990). Such complexes host gold deposits in North-East Russia (Natalka, Mayskoe, Nezhdaninskoye), Australia (Bendigo, Ballarat), Alaska (Juno), California (Maser Lode), and in many other belts.…”

Section: Introductionmentioning

confidence: 99%

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‘Indicator’ carbonaceous phyllite/graphitic schist in the Archean Kundarkocha gold deposit, Singhbhum orogenic belt, eastern India: Implications for gold mineralization vis-a-vis organic matter

Sahoo

Venkatesh

2014

J Earth Syst Sci

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Carbonaceous rocks in the form of graphitic schist and carbonaceous phyllite are the major host rocks of the gold mineralization in Kundarkocha gold deposit of the Precambrian Singhbhum orogenic belt in eastern India. The detection of organic carbon, essentially in the carbonaceous phyllite and graphitized schist within the Precambrian terrain, is noted from this deposit. A very close relationship exists between gold mineralization and ubiquitous carbonaceous rocks containing organic carbon that seems to play a vital role in the deposition of gold in a Precambrian terrain in India and important metallogenetic implications for such type of deposits elsewhere. However, the role played by organic matter in a Precambrian gold deposit is debatable and the mechanism of precipitation of gold and other metals by organic carbon has been reported elsewhere. Fourier transform infrared spectroscopy (FTIR) results and total organic carbon (TOC) values suggest that at least part of the organic material acted as a possible source for the reduction that played a significant role in the precipitation of gold. Lithological, electron probe analysis (EPMA), fluid inclusions associated with gold mineralization, Total Carbon (TC), TOC and FTIR results suggest that the gold mineralization is spatially and genetically associated with graphitic schist, carbonaceous phyllite/shale that are constituted of immature organic carbon or kerogen. Nano-scale gold inclusions along with free milling gold are associated with sulfide mineral phases present within the carbonaceous host rocks as well as in mineralized quartz-carbonate veins. Deposition of gold could have been facilitated due to the organic redox reactions and the graphitic schist and carbonaceous phyllite zone may be considered as the indicator zone.

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

‘Indicator’ carbonaceous phyllite/graphitic schist in the Archean Kundarkocha gold deposit, Singhbhum orogenic belt, eastern India: Implications for gold mineralization vis-a-vis organic matter

Sahoo

Venkatesh

2014

J Earth Syst Sci

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“…The involvement of the organic matter in some aspects of the ore formation (e.g., Meyers et al, 1992;Mossmann, 1999) varies from active participation in the emplacement of ore deposits to post-depositional alteration of the organic matter that may be related or unrelated with the ore forming process. The incorporation of organic petrology methods in studies of metal concentration may assist in the evaluation of the time-temperature burial history of ores and may elucidate the active or passive role of the organic matter in ore deposition, thereby helping to determine the source of metals, transportation and precipitation mechanisms, and provides indications of the thermal history of the host rocks.…”

Section: Ore Depositsmentioning

confidence: 99%

Organic Petrology: An Overview

Suárez-Ruiz¹

2012

Petrology - New Perspectives and Applications

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“…The rock types of the black rock series are various, which refers to a set of gray or black rock combinations, mainly including mud shale, siliceous rock, carbonate rock, sedimentary tuff, and metamorphic rock (Fan et al 1973;Meyers et al 1992;Mao et al 2002). Black rock series are the product of specific geological environment in the evolution of the earth and the result of changes and interactions of lithosphere, hydrosphere, atmosphere, and biosphere (Pearce et al 2008), so it is of great significance to study the distribution and mechanism of chemical elements in the earth's surface and to reconstruct the history and process of the earth's evolution (Fan et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of the lower Cambrian Qiongzhusi Formation in Huize area, east Yunnan: implications for paleo-ocean environment and the origin of black rock series

Cheng

Liu

et al. 2021

Arab J Geosci

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The lower Cambrian black rock series in eastern Yunnan province is a high-quality shale gas reservoir with great prospect for oilgas exploration. However, the depositional conditions and mechanisms of organic matter enrichment are not well understood. In this study, geochemical characteristics of total organic carbon (TOC) and major and trace elements of fourteen black rock series samples from Dahai outcrop in eastern Yunnan province are systematically investigated to analyze the paleoenvironment and their effects on organic matter enrichment and established the accumulation model of organic matter. Results show that TOC contents of the four lithologic units of Qiongzhusi Formation black rock series are 0.70, 0.34, 1.77, and 0.27, respectively, which suggests that TOC content is generally low (mean = 0.51%). The main elements show that P 2 O 5 , CaO, and MgO are relatively rich, whereas other elements depleted. The enrichment factors (EFs) of trace elements showed that Pb and Zn are highly enriched in all samples, and Cu, Sr, Ba, U, Mo, V, Be, and Mo are also enriched in different lithofacies units. The elemental anomalies may be related to hydrothermal activities, which may lead to the distortion of some paleoenvironmental indicators to some extent. The Rb/Sr and Sr/Cu values show that the palaeoclimate gradually changed from dry to humid. Al concentrations indicate a gradual increase in terrigenous detritus supply. The hydrodynamic conditions and sedimentation rates implied by Zr/Al and Ti/Al values correspond well with lithology and grain size. Based on the comprehensive analysis of B/Ga and Sr/Ba ratios, it is considered that the black rock series in Qiongzhusi Formation was mainly formed in brachial water. Multiple paleoredox indicators (e.g., Ni/Co, V/Cr, U/Th, and V/(V+Ni) ratios) suggest that the sedimentary environment is mainly oxidized, which is usually considered unfavorable for organic matter preservation, and it also forms carbonaceous shale (unit 3) in a dysoxic environment. The Mo/ TOC ratios suggest that the sedimentation during Qiongzhusi Formation period was under restricted conditions. The paleoproductivity indicated by P/Ti, Ni/Al and Ba bio values decreased gradually from medium level to low level. In summary, relatively high paleoproductivity is a prerequisite for organic matter accumulation and less terrigenous debris supply, and relatively arid climate and reductive conditions are favorable for the preservation of organic matter.

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Introduction to geochemistry of metalliferous black shales

Cited by 21 publications

References 7 publications

‘Indicator’ carbonaceous phyllite/graphitic schist in the Archean Kundarkocha gold deposit, Singhbhum orogenic belt, eastern India: Implications for gold mineralization vis-a-vis organic matter

‘Indicator’ carbonaceous phyllite/graphitic schist in the Archean Kundarkocha gold deposit, Singhbhum orogenic belt, eastern India: Implications for gold mineralization vis-a-vis organic matter

Organic Petrology: An Overview

Geochemical characteristics of the lower Cambrian Qiongzhusi Formation in Huize area, east Yunnan: implications for paleo-ocean environment and the origin of black rock series

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