Geochemical models of metasomatism in ultramafic systems: serpentinization, rodingitization, and sea floor carbonate chimney precipitation

Palandri, James; Reed, Mark H.

doi:10.1016/j.gca.2003.08.006

Cited by 237 publications

(161 citation statements)

References 68 publications

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“…), H 2 S, LREE (La, Ce and Eu) and CaO Bischoff and Rosenbauer 1989;Bienvenu et al 1990;Seewald and Seyfried 1990;Palandri and Reed 2004). These results are comparable to the composition of vent fluids from modern basalt-hosted high temperature systems and, remarkably, to the Rainbow vent field (Douville et al 2002;James et al 1995;Seewald and Seyfried 1990).…”

Section: Nd Isotopesmentioning

confidence: 59%

“…Experiments on simple peridotite-seawater interactions at temperatures below 350ºC produced high pH fluids (neutral to alkaline), rich in H 2 , CH 4 , H 2 S, Mn and SiO 2 with low dissolved metal contents Dibble 1980, Berndt et al 1996;Donval et al 1997;Kelley et al 2001;Palandri and Reed 2004). At temperatures of ~400ºC, fluids are initially acidic (pH increasing afterwards) with high dissolved Fe, Ca and SiO 2 (Seyfried and Ding 1995;Allen and Seyfried 2003, 2005.…”

Section: Nd Isotopesmentioning

confidence: 99%

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Mineralogy, geochemistry, and Nd isotope composition of the Rainbow hydrothermal field, Mid-Atlantic Ridge

et al. 2006

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Petrological, geochemical and Nd-isotopic analyses have been carried out on rock samples from the Rainbow vent field to assess the evolution of the hydrothermal system. The Rainbow vent field is an ultramafic-hosted hydrothermal system located on the Mid-Atlantic Ridge, characterized by vigorous high-temperature venting (~365ºC) and unique chemical composition of fluids: high chlorinity, low pH and very high Fe and REE contents (Douville et al. 2002). Serpentinisation has occurred under a low-temperature (<270ºC) retrograde

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Section: Nd Isotopesmentioning

confidence: 59%

Section: Nd Isotopesmentioning

confidence: 99%

Mineralogy, geochemistry, and Nd isotope composition of the Rainbow hydrothermal field, Mid-Atlantic Ridge

et al. 2006

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“…On Earth, the mixing of the high-pH hydrothermal fluid derived from serpentinization with cold sea water is observed to produce calcite in submarine, ultramafic rock-hosted, carbonate mineral deposits precipitating at hydrothermal vents (Palandri and Reed 2004). Serpentinization of ultramafic rocks could convert crustal carbonate into CH 4 through the reaction of dissolved CO 2 with H 2 , similar to what is observed in hydrothermal systems of mid-ocean ridges (Atreya et al 2007;Oze and Sharma 2005).…”

Section: Hydrothermal Environmentsmentioning

confidence: 73%

Geochemistry of Carbonates on Mars: Implications for Climate History and Nature of Aqueous Environments

Niles¹,

Catling²,

Berger³

et al. 2012

Quantifying the Martian Geochemical Reservoirs

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Ongoing research on martian meteorites and a new set of observations of carbonate minerals provided by an unprecedented series of robotic missions to Mars in the past 15 years help define new constraints on the history of martian climate with important cross- cutting themes including: the CO 2 budget of Mars, the role of Mg-, Fe-rich fluids on Mars, and the interplay between carbonate formation and acidity.Carbonate minerals have now been identified in a wide range of localities on Mars as well as in several martian meteorites. The martian meteorites contain carbonates in low abundances (<1 vol.%) and with a wide range of chemistries. Carbonates have also been identified by remote sensing instruments on orbiting spacecraft in several surface locations as well as in low concentrations (2-5 wt.%) in the martian dust. The Spirit rover also identified an outcrop with 16 to 34 wt.% carbonate material in the Columbia Hills of Gusev Crater that strongly resembled the composition of carbonate found in martian meteorite ALH 84001. Finally, the Phoenix lander identified concentrations of 3-6 wt.% carbonate in the soils of the northern plains.The carbonates discovered to date do not clearly indicate the past presence of a dense Noachian atmosphere, but instead suggest localized hydrothermal aqueous environments with limited water availability that existed primarily in the early to mid-Noachian followed by low levels of carbonate formation from thin films of transient water from the late Noachian to the present. The prevalence of carbonate along with evidence for active carbonate precipitation suggests that a global acidic chemistry is unlikely and a more complex relationship between acidity and carbonate formation is present.

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“…It can host cryptocrystalline magnesite, talc and asbestos deposits (Simandl and Ogden, 1999); Brucite, (Antonio and Kristensen, 2004); un-usual nickel minerals and hydrogarnet (Frost and Beard, 2007). During the process of serpentinization, platinum group elements may also concentrates in sulfide ore complexes (Palandri and Reed, 2004). Present studies highlighted the petrology, mineralogy and geochemistry of serpentinized ultramafic rocks and a genetic model is deduced to display process of serpentinization in the study area.…”

mentioning

confidence: 82%

Study of Serpentinized Ultramafic Rocks of Bela Ophiolite, Balochistan, Pakistan

Bashir¹,

Naseem²,

Kaleem³

et al. 2012

JGG

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Geochemical models of metasomatism in ultramafic systems: serpentinization, rodingitization, and sea floor carbonate chimney precipitation

Cited by 237 publications

References 68 publications

Mineralogy, geochemistry, and Nd isotope composition of the Rainbow hydrothermal field, Mid-Atlantic Ridge

Mineralogy, geochemistry, and Nd isotope composition of the Rainbow hydrothermal field, Mid-Atlantic Ridge

Geochemistry of Carbonates on Mars: Implications for Climate History and Nature of Aqueous Environments

Study of Serpentinized Ultramafic Rocks of Bela Ophiolite, Balochistan, Pakistan

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