Features of acid–saline systems of Southern Australia

Dickson, B.L.; Giblin, Angela M.

doi:10.1016/j.apgeochem.2008.11.011

Cited by 17 publications

(6 citation statements)

References 21 publications

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“…The occurrence of Fe- sulfate minerals throughout these sediments reflects a largely water-limited regime (Klingelhöfer et al, 2004;Poulet et al, 2008;Dickson and Giblin, 2009 At Meridiani Planum, the interaction of acidic water with a basaltic substrate would inevitably have led to an increase in pH through proton consumption and cation release. This would have displaced the equilibrium saturation of Fe-sulfate minerals (which are stable only at low pH) and initiated their decomposition.…”

Section: Fe-sulfate Mineralsmentioning

confidence: 99%

Juvenile chemical sediments and the long term persistence of water at the surface of Mars

Tosca

Knoll

2009

Earth and Planetary Science Letters

136

124

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Chemical sediments and the aqueous alteration products of volcanic rocks clearly indicate the presence of water, at least episodically, at the martian surface. Compared to similar materials formed on the early Earth, however, martian deposits are juvenile, or diagenetically under-developed. Here we examine the role of water in facilitating various diagenetic reactions and evaluate the predicted effects of time and temperature for aqueous diagenesis on Mars.Using kinetic formulations based on terrestrial sedimentary geology, we quantify the integrated effects of time and temperature for a range of possible burial and thermal histories of precipitated minerals on Mars. From this, we estimate thresholds beyond which these precipitates should have been converted to the point of non-detection in the presence of water. Surface water has been shown to be at least episodically present in recent times. Nonetheless, the integrated duration of aqueous activity recorded over geologically long intervals by hydrated amorphous silica, smectite clays and Fe-sulfate minerals suggest that where these minerals occur water did not persist much beyond their initial deposition. This geochemical conclusion converges with geomorphologic studies that suggest water limitation during the late Noachian-Hesperian peak of potentially habitable environments on Mars should address the timescales on which liquid water has persisted and the timing of aqueous episodes relative to major planetary events.

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Section: Fe-sulfate Mineralsmentioning

confidence: 99%

Juvenile chemical sediments and the long term persistence of water at the surface of Mars

Tosca

Knoll

2009

Earth and Planetary Science Letters

136

124

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“…While acidity in saline groundwater is known to occur across southern Australia (Dickson and Giblin, 2009), the influence of this on surface waters was reported as being limited to primary saline lakes (Bowen and Benison, 2009) and some lakes salinised after land clearing (Shand and Degens, 2008). Furthermore, investigations of stream and land salinity problems associated with rising saline groundwater across the globe typically report the groundwater as being circum-neutral to alkaline (Farber et al, 2004;Moore et al, 2008;Salama et al, 1999).…”

Section: Discussionmentioning

confidence: 98%

Acidification of salinised waterways by saline groundwater discharge in south-western Australia

Degens

Muirden

Kelly

et al. 2012

Journal of Hydrology

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“…Acid sulfate minerals, soils, and weathering profiles have been reported across Australia. Lake Tyrrell in northern Victoria is famous for its localized acid brines (e.g.., Dickson and Giblin, 2009;Long et al, , 2009. Thiry et al (2006) interpreted acidic groundwater alteration in south-central Australia to have produced weathering profiles rich in kaolinite, gypsum, alunite, and opal.…”

Section: Widespread Acid Brines Throughout Australiamentioning

confidence: 99%

The evolution of end-member continental waters: The origin of acidity in southern Western Australia

Benison¹,

Bowen²

2015

GSAT

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The Yilgarn Craton of Western Australia hosts a regional acid saline groundwater system and hundreds of ephemeral saline lakes characterized by complex acid brines. These acid saline lakes and groundwaters have pH as low as 1.4 and salinities as high as 32% total dissolved solids. The low pH formed by a combination of processes dependent upon the host rock lithology and mineralogy, climate, weathering, organisms, and time. Although these modern acid saline environments are relatively rare, they have both ancient terrestrial and extraterrestrial counterparts. Understanding acidification processes provides enhanced understanding of hydrosphere-lithosphere-atmosphere-biosphere interactions. These environments present evidence of new brine evolution pathways and suggest the potential for future intense acid brine environments.

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Features of acid–saline systems of Southern Australia

Cited by 17 publications

References 21 publications

Juvenile chemical sediments and the long term persistence of water at the surface of Mars

Juvenile chemical sediments and the long term persistence of water at the surface of Mars

Acidification of salinised waterways by saline groundwater discharge in south-western Australia

The evolution of end-member continental waters: The origin of acidity in southern Western Australia

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