Structural controls on hydrothermal alteration and gold?antimony mineralisation in the Hillgrove area, NSW, Australia

Ashley, P. M.; Craw, D.

doi:10.1007/s00126-003-0400-1

Cited by 35 publications

(12 citation statements)

References 31 publications

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“…Although the paragenesis of Au deposits in the goldfield remain far from understood, there broadly appears to have been two phases of mineralisation: an earlier ductile phase that introduced arsenopyrite, gold and quartz which has been variably overprinted by a brittle phase associated with the aforementioned minerals as well as stibnite (Christie & Braithwaite 2003;Milham & Craw 2009). The occurrence of stibnite implies that the second mineralisation event occurred during or after uplift of the Greenland Group because this mineral commonly precipitates only at very shallow levels (Ashley & Craw 2004;Craw et al 2009). The first mineralisation event was synchronous with or post-dated regional folding of the Greenland Group, and both mineralisation events predate deposition of Eocene sediments that overlie mineralised structures; otherwise, the timing of mineralisation is unconstrained.…”

Section: Implications For the Reefton Goldfieldmentioning

confidence: 97%

Cretaceous metamorphism, magmatism and shearing in the Waipuna Valley, directly south of the Reefton Goldfield

Ritchie

Scott

Muhling

et al. 2015

New Zealand Journal of Geology and Geophysics

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Section: Implications For the Reefton Goldfieldmentioning

confidence: 97%

Cretaceous metamorphism, magmatism and shearing in the Waipuna Valley, directly south of the Reefton Goldfield

Ritchie

Scott

Muhling

et al. 2015

New Zealand Journal of Geology and Geophysics

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“…In their opinion, antimony deposits bear evidence for their formation under mesothermal conditions. Sev eral stages of mineralization have been distinguished at some Au-Sb deposits, and stibnite and gold-stibnite stages were the latest (Dill et al, 1995;Ashley and Grow, 2004;Kontak and Kerrich, 1996).…”

Section: Introductionmentioning

confidence: 97%

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

et al. 2010

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New mineralogical, thermobarometric, isotopic, and geochemical data provide evidence for long and complex formation history of the Sarylakh and Sentachan Au-Sb deposits conditioned by regional geo dynamics and various types of ore mineralization, differing in age and source of ore matter combined in the same ore localizing structural units. The deposits are situated in the Taryn metallogenic zone of the East Yakutian metallogenic belt in the central Verkhoyansk-Kolyma Fold Region. They are controlled by the regional Adycha-Taryn Fault Zone that separates the Kular-Nera Terrane and the western part of the Verkhoyansk Fold-Thrust Belt. The fault extends along the strike of the northwest trending linear folds and is deep rooted and repeatedly reactivated. The orebodies are mineralized crush zones accompanied by sulfi dated (up to 100 m wide) quartz-sericite metasomatic rocks and replacing dickite-pyrophyllite alteration near stibnite veinlets. Two stages of low sulfide gold-quartz and stibnite mineralization are distinguished. The formation conditions of the early milk white quartz in orebodies with stibnite mineralization at the Sary lakh and Sentachan deposits are similar: temperature interval 340-280°C, salt concentration in fluids 6.8-1.6 wt % NaCl equiv, fluid pressure 3430-1050 bar, and sodic bicarbonate fluid composition. The ranges of fluid salinity overlapped at both deposits. In the late regenerated quartz that attends stibnite mineralization, fluid inclusions contain an aqueous solution with salinity of 3.2 wt % NaCl equiv and are homogenized into liquid at 304-189°C. Syngenetic gas inclusions contain nitrogen 0.19 g/cm 3 in density. The pressure of 300 bar is estimated at 189°C. The composition of the captured fluid is characterized as K-Ca bicarbonatesulfate. The sulfur isotopic composition has been analyzed in pyrite and arsenopyrite from ore and metaso matic zones, as well as in coarse , medium , and fine grained stibnite varieties subjected to dynamometa morphism. The following δ 34 S values, ‰ have been established at the Sarylakh deposit: -2.0 to -0.9 in arse nopyrite, -5.5 to -1.1 in pyrite, and -5.5 to -3.6 in stibnite. At the Sentachan deposit: -0.8 to +1.0 in arse nopyrite, +0.5 to +2.6 in pyrite, and -3.9 to +0.6 in stibnite. Sulfides from the Sentachan deposit is somewhat enriched in 34 S. The 18 O of milk white quartz at the Sarylakh deposit varies from +14.8 to 17.0‰ and from +16.4 to + 19.3‰ at the Sentachan. The δ 18 O of regenerated quartz is +16.5‰ at the Sarylakh and +17.6 to +19.8‰ at the Sentachan. The δ 18 O of carbonates varies from +15.0 to 16.3% at the Sarylakh and from +16.7 to +18.2‰ at the Sentachan. The δ 13 C of carbonates ranges from -9.5 to -12.1‰ and -7.8 to -8.5‰, respectively. The calculated δ 18 O H 2 O of the early fluid in equilibrium with quartz and dolomite at 300°C are +7.9 to +10.1‰ for the Sarylakh deposit and +9.5 to +12.4‰ for the Sentachan deposit (+4.9 and 6.0‰ at 200°C for the late fluid, respectively). Most estimates fall into the interval characteristic o...

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“…These settings have produced 40% of the world's antimony and have been mined in terranes ranging in age from Archaean, such as the "Antimony Line" in South Africa (Davis, Paterson, & Griffiths, 1986;Jaguin et al, 2013;Pearton & Viljoen, 1986) and the Wiluna deposit in Western Australia (Czarnota, Blewett, & Goscombe, 2010;Hagemann & L€ uders, 2003), to Phanerozoic, such as Hilgrove in New South Wales, Australia (Ashley & Craw, 2004;Boyle, 1990), Baogutu in northwest China (An & Zhu, 2010;Zheng, Zhu, An, Huang, & Qiu, 2015), La Lucette in France (Chauris & Marcoux, 1994;Pochon et al, 2016) and the Sarylakk and Sentachan deposits in Sakha-Yakutia, Russia (Bortnikov, Gamunin, Vilent'eva, Prokof'ev, & Prokop'ev, 2010). The deposits are hosted by low-grade, greenschist facies regionally metamorphosed rocks and may include stratabound gold-antimony mineralized rocks.…”

Section: Introductionmentioning

confidence: 99%

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

et al. 2017

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Antimony‐rich gold deposits represent a subclass of orogenic hydrothermal systems. The study of the Lapa gold deposit in the Abitibi greenstone belt shows that antimony occurs during two different stages: (1) as early prograde Sb–Ni disseminated sulphides in talc schists, associated with CO2‐bearing fluids, and (2) as a late native antimony association, associated with methane‐bearing fluids indicating a reducing environment. Methane could be related to the serpentinization of the ultramafic rocks of the Piché Group hosting the Lapa deposit. Several deposits display the same methane antimony association along fault zones.

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Structural controls on hydrothermal alteration and gold?antimony mineralisation in the Hillgrove area, NSW, Australia

Cited by 35 publications

References 31 publications

Cretaceous metamorphism, magmatism and shearing in the Waipuna Valley, directly south of the Reefton Goldfield

Cretaceous metamorphism, magmatism and shearing in the Waipuna Valley, directly south of the Reefton Goldfield

The Sarylakh and Sentachan gold-antimony deposits, Sakha-Yakutia: A case of combined mesothermal gold-quartz and epithermal stibnite ores

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

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