Petrological and maturation characteristics of organic matter from the Middle Proterozoic McArthur Basin, Australia

Crick, I. H.

doi:10.1080/08120099208728042

Cited by 46 publications

(28 citation statements)

References 33 publications

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“…These rocks were organicrich mudstones and siltstones (cf. Boreham et al, 1988;Crick et al, 1988;Summons et al, 1988;Jackson and Raiswell, 1991;Crick, 1992). They found that the low-maturity samples showed surface fractal behavior with a slope of À3.5.…”

Section: Meaning Of Fuzzy Interfacementioning

confidence: 91%

A new approach to quantification of metamorphism using ultra-small and small angle neutron scattering

Anovitz

Lynn

Cole

et al. 2009

Geochimica et Cosmochimica Acta

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Section: Meaning Of Fuzzy Interfacementioning

confidence: 91%

A new approach to quantification of metamorphism using ultra-small and small angle neutron scattering

Anovitz

Lynn

Cole

et al. 2009

Geochimica et Cosmochimica Acta

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“…Thermal maturity of organic matter in the Velkerri Formation ranges from marginally mature (buried to a maximum depth of $2.5 km and $75°; Jackson et al, 1988) to highly mature (i.e., T up to $150°C) except where affected by a dolerite sill intrusion (Crick et al, 1988;Crick, 1992;Summons et al, 1994;George and Ahmed, 2002). At least two episodes of hydrocarbon migration from the Velkerri Formation occurred prior to ca.…”

Section: Velkerri Formationmentioning

confidence: 98%

Re–Os and Mo isotope systematics of black shales from the Middle Proterozoic Velkerri and Wollogorang Formations, McArthur Basin, northern Australia

Kendall

Creaser

Gordon

et al. 2009

Geochimica et Cosmochimica Acta

221

146

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“…Organic matter in the McArthur Basin is present in fine-grained clastic sedimentary rocks and comprises a combination of authigenic and migrated organic matter [18]. Biomarkers in the organic matter are consistent with the involvement of saline, sulfate-bearing waters in formation of the organic matter [23].…”

Section: Geological Settingmentioning

confidence: 92%

“…HYC is hosted by sediments of the Middle Proterozoic McArthur Basin, an intracratonic basin containing a sediment sequence up to 12 km thick, exposed over 200,000 km 2 , that was deposited between 1800-1400 Ma [16,17]. The sedimentary rocks have been described as unmetamorphosed [13], though local increases in organic maturity parameters in the vicinity of the HYC deposit have been used to suggest that rocks affected by mineralisation were heated by contact with ore-bearing solutions [18]. Mineralising fluids are thought to have flowed up the Emu fault zone prior to ore deposition (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

Dick

Evans

Holman

et al. 2014

GeoResJ

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a b s t r a c tThe formation of base metal sulfide deposits requires not only a source of metals but also reduced sulfur. If incoming sulfur is present in ore fluids as sulfate, then a source of electrons is needed to drive the reduction of sulfate to sulfide. The oxidation of organic matter can release electrons that provide the reducing capacity, whether it be in low-or high-temperature settings that are conducive to biological or thermochemical sulfate reduction (BSR or TSR). The amounts of organic matter reacted and sulfide minerals formed can be estimated by mass balance calculations. In this study, an integrated mass balance expression is formulated that takes into account the sulfide mineral content and organic carbon content and H/C ratios of mineralised and non-mineralised rocks. Model calculations based on carbon, sulfur and redox budget balances suggest that the extent of oxidation of the organic matter present at the Here's Your Chance (HYC) Pb-Zn deposit is insufficient for reduction of the required quantity of sulfate. The results imply that externally derived reducing capacity and/or reduced sulfur is required to form the metal resource. Possible sources include hydrocarbon-rich fluids from deeper parts of the sedimentary sequence or formation of sulfide and organic matter as products of BSR during sedimentation/early diagenesis. However, the observed oxidation of organic matter associated with the deposit suggests that at least some reducing capacity is locally derived. Therefore, our calculations are consistent with genetic models for HYC that have multiple sources of redox budget for sulfate reduction.

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Petrological and maturation characteristics of organic matter from the Middle Proterozoic McArthur Basin, Australia

Cited by 46 publications

References 33 publications

A new approach to quantification of metamorphism using ultra-small and small angle neutron scattering

A new approach to quantification of metamorphism using ultra-small and small angle neutron scattering

Re–Os and Mo isotope systematics of black shales from the Middle Proterozoic Velkerri and Wollogorang Formations, McArthur Basin, northern Australia

Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

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