Intrusion-related, high-temperature gold quartz veining in the Cosmopolitan Howley metasedimentary rock-hosted gold deposit, Northern Territory, Australia

Matthaei, Stephan K.; Henley, Richard W.; Bacigalupo-Rose, Stephen; Binns, R. A.; Andrew, Anita S.; Carr, Graham R.; French, David; McAndrew, John; Kananagh, Martin E.

doi:10.2113/gsecongeo.90.5.1012

Cited by 24 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In any case, only a small proportion of the total generated sulfide melt should arrive to the surface, and the existence of other magma chambers at intermediate depth is likely. Such staging chambers have been described as critical in the shallow emplacement of magmas (e.g., Jahoda et al 1989;Saint Blanquat et al 1998), in mesothermal gold deposits (Roberts et al 1991;Matthai et al 1995), in epithermal gold (Tosdal and Nutt 1998), in voIcanic-and shale-hosted massive sulfide deposits (Gauthier et al 1994), and in porphyry copper districts (Unrug et al 1999), but there are few evidences that they controlled the formation of Ni-Cu sulfide deposits.…”

Section: Discussion and Genetic Modelmentioning

confidence: 99%

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

et al. 2006

View full text Add to dashboard Cite

show abstract

Section: Discussion and Genetic Modelmentioning

confidence: 99%

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

et al. 2006

View full text Add to dashboard Cite

show abstract

“…One CM type was of high metamorphic grade or crystallinity and representative of the sedimentary matrix, whilst the other CM reflected a relatively high degree of disorder and seemed to be spatially associated with sulfide veins throughout the sediment. The Raman inferred temperatures for these two CM's were ∼400°C and ∼300°C, respectively (Robert et al, 2016), both substantially lower than fluid inclusion and mineralogically inferred temperatures of > 550°C (Matthäi et al, 1995a). Depositional temperatures in excess of 550°C would be consistent with the documented deformation, metamorphic and hydrothermal fluid characteristics of this deposit (Bajwah, 1994;Ewers et al, 1985;Matthäi et al, 1995a,b;Matthäi and Henley, 1996;Needham et al, 1988;Partington and McNaughton, 1997).…”

mentioning

confidence: 50%

“…1) where maximum hydrothermal fluid flow occurred. This mineralisation boundary was exposed to peak metamorphic temperature of > 550°C based on mineralogy and fluid inclusion data (Matthäi et al, 1995a). There have been several detailed accounts of the geology and stratigraphy of the Cosmo Howley Au deposit (Matthäi et al, 1995a,b;Matthäi and Henley, 1996;Partington and McNaughton, 1997;Robert et al, 2016).…”

Section: Sample Informationmentioning

confidence: 99%

“…These C-structures are typical of syngenetic kerogen exposed to high (regional and contact) metamorphic conditions. The metamorphic conditions of the Koolpin Formation (host for the Cosmo Howley deposit) arose from complex and multiple deformation events before and following the intrusion of the Cullen Batholith (1835-1825 MYA) (Ewers et al, 1985;Needham et al, 1988;Bajwah, 1994;Matthäi et al, 1995a;Matthäi and Henley, 1996;Partington and McNaughton, 1997). These events could have influenced the transformation of the in situ kerogen to the presently observed highly graphitic CM ker .…”

Section: Types In Co-24 -Raman Based Vs Nanoscale Interpretation mentioning

confidence: 99%

“…Rapid pressure release (encompassing the boiling mechanism) is likely one of the predominant processes responsible for the deposition of Au and sulfides at Cosmo-Howley given the extensive veining in the deposit (Matthäi et al, 1995a;Matthäi et al, 1995b). In the framework of a pressure drop, kinetic factors suggest hydrothermally dissolved organics would similarly precipitate.…”

Section: Om Transformation In Orogenic Systems and Its Significance Tmentioning

confidence: 99%

See 2 more Smart Citations

Evidence and origin of different types of sedimentary organic matter from a Paleoproterozoic orogenic Au deposit

Mirasol-Robert

Grotheer

Bourdet

et al. 2017

Precambrian Research

View full text Add to dashboard Cite

A B S T R A C TCarbonaceous material (CM) is thought to be a key reductant contributing to the formation of large Au deposits, but there has been much speculation about its source, molecular composition and reactivity. The first successful analytical retrieval of organic compounds from a thermally over-mature (> 550°C) Paleoproterozoic CosmoHowley Orogenic Au deposit was recently achieved by Robert et al. (2016). Here, we have evaluated the nature of the CM associated with this high temperature Au mineralisation via an integrated analytical approach which combined high-resolution in situ laser Raman spectroscopy, micro to nano-scale imaging (e.g., EELS, HAADF-STEM, and HRTEM) and molecular and isotopic geochemistry. We identified two distinct CM types: CM ker -an ubiquitous highly graphitic kerogen typical of high-grade metamorphic conditions formed by regional metamorphism; and CM fd -small sub-microscopic inclusion-like nodules of highly disordered carbon rich in polycyclic aromatic hydrocarbons (PAHs), coincident within the Au-bearing sulfide minerals in hydrothermal vein regions. The paragenetic emplacement and molecular characteristics of CM fd suggests a formation by metasomatic processes and introduction by a hydrothermal fluid which might also have co-transported Au. CM ker and CM fd gave different Raman spectra indicative of their contrasting origin and structural response to regional and contact metamorphic history and subsequent metasomatism of the Cosmo-Howley deposit. Raman signals indicated CM ker had a graphitic like structure whereas CM fd comprised high concentrations or clusters of PAHs. The broad range of Raman spectra detected here (and by others in similar studies) was likely due to the mixed signals of these two types of CM. The δ 13 C values of PAH products released via the HyPy treatment of the parent and sequentially demineralised kerogen fractions were measured to be in the range of −20 to −30‰, indicative of an organic biopolymeric origin. The δ 13 C values of PAHs products decreased with demineralisation, concomitant with an increase in their concentrations and affinity to the sulfide-minerals (and associated CM fd ) suggesting a close relationship. The localised (within 20 mm) co-occurrence of different CM types and apparent abundance correlation of CM fd with Au and sulfides suggests Au mineralisation might be supported by specific CM types, and these relationships should be evaluated further including on a wider Au deposit scale.

show abstract

A fluid inclusion and isotopic study of an intrusion-related gold deposit (IRGD) setting in the 380 Ma South Mountain Batholith, Nova Scotia, Canada: evidence for multiple fluid reservoirs

Kontak

Kyser

2011

Miner Deposita

View full text Add to dashboard Cite

Intrusion-related, high-temperature gold quartz veining in the Cosmopolitan Howley metasedimentary rock-hosted gold deposit, Northern Territory, Australia

Cited by 24 publications

References 0 publications

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

The Aguablanca Ni–(Cu) sulfide deposit, SW Spain: geologic and geochemical controls and the relationship with a midcrustal layered mafic complex

Evidence and origin of different types of sedimentary organic matter from a Paleoproterozoic orogenic Au deposit

A fluid inclusion and isotopic study of an intrusion-related gold deposit (IRGD) setting in the 380 Ma South Mountain Batholith, Nova Scotia, Canada: evidence for multiple fluid reservoirs

Contact Info

Product

Resources

About