Thermodynamic modeling and elemental migration for the early stage of rodingitization: An example from the Xialu massif of the Xigaze ophiolite, southern Tibet

Duan, Wen-Yong; Li, Xuping; Wang, Ze-Li; Chen, Shuang; Sun, Guang-Ming; Ling, Zhao

doi:10.1016/j.gsf.2020.12.006

Cited by 13 publications

(4 citation statements)

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“…The case of rodingitization is particular, and geochemically very specific: calcium-rich waters acting on mafic lithologies (Ca-metasomatism), often associated with serpentinization [226], drive the formation of specific low pressure-temperature mineral assemblages including prehnite, tremolite, diopside, hydrogarnet, epidote or clinozoisite, chlorite, calcite, and rare titanite, apatite, and zircon [226][227][228][229][230][231]. Many of these minerals occur in model outputs.…”

Section: Indicator Minerals For Mafic Unit Alteration (Máaz)mentioning

confidence: 99%

Mineral Indicators of Geologically Recent Past Habitability on Mars

Hart,

Cardace

2023

Life

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We provide new support for habitable microenvironments in the near-subsurface of Mars, hosted in Fe- and Mg-rich rock units, and present a list of minerals that can serve as indicators of specific water–rock reactions in recent geologic paleohabitats for follow-on study. We modeled, using a thermodynamic basis without selective phase suppression, the reactions of published Martian meteorites and Jezero Crater igneous rock compositions and reasonable planetary waters (saline, alkaline waters) using Geochemist’s Workbench Ver. 12.0. Solid-phase inputs were meteorite compositions for ALH 77005, Nakhla, and Chassigny, and two rock units from the Mars 2020 Perseverance rover sites, Máaz and Séítah. Six plausible Martian groundwater types [NaClO4, Mg(ClO4)2, Ca(ClO4)2, Mg-Na2(ClO4)2, Ca-Na2(ClO4)2, Mg-Ca(ClO4)2] and a unique Mars soil-water analog solution (dilute saline solution) named “Rosy Red”, related to the Phoenix Lander mission, were the aqueous-phase inputs. Geophysical conditions were tuned to near-subsurface Mars (100 °C or 373.15 K, associated with residual heat from a magmatic system, impact event, or a concentration of radionuclides, and 101.3 kPa, similar to <10 m depth). Mineral products were dominated by phyllosilicates such as serpentine-group minerals in most reaction paths, but differed in some important indicator minerals. Modeled products varied in physicochemical properties (pH, Eh, conductivity), major ion activities, and related gas fugacities, with different ecological implications. The microbial habitability of pore spaces in subsurface groundwater percolation systems was interrogated at equilibrium in a thermodynamic framework, based on Gibbs Free Energy Minimization. Models run with the Chassigny meteorite produced the overall highest H2 fugacity. Models reliant on the Rosy Red soil-water analog produced the highest sustained CH4 fugacity (maximum values observed for reactant ALH 77005). In general, Chassigny meteorite protoliths produced the best yield regarding Gibbs Free Energy, from an astrobiological perspective. Occurrences of serpentine and saponite across models are key: these minerals have been observed using CRISM spectral data, and their formation via serpentinization would be consistent with geologically recent-past H2 and CH4 production and sustained energy sources for microbial life. We list index minerals to be used as diagnostic for paleo water–rock models that could have supported geologically recent-past microbial activity, and suggest their application as criteria for future astrobiology study-site selections.

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Section: Indicator Minerals For Mafic Unit Alteration (Máaz)mentioning

confidence: 99%

Mineral Indicators of Geologically Recent Past Habitability on Mars

Hart,

Cardace

2023

Life

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“…This suggests that the transformation was controlled by channeled fluid circulation near faults and fractures where a higher volume of fluid flowed. Epidote-group minerals usually represent common rodingite minerals mainly in samples that were only slightly affected by the rodingitization process (Duan et al, 2021;Li et al, 2004;Schandl et al, 1989). This is why epidote is often considered to be one of the first rodingite minerals to form.…”

Section: Evolution Of Mineral Paragenesesmentioning

confidence: 99%

“…CO2 concentration in the hydrothermal fluid is another parameter to be considered. Thermodynamic calculations indicates that CO2 have to be very low (XCO2 < 10 −4 ) to allow the formation of vesuvianite (Duan et al, 2021;Li et al, 2008). However, Salvioli-Mariani et al (2020) show that low CO2 concentration is not required to stabilize vesuvianite and CO2 concentration is thus not a limiting factor.…”

Section: Control On Vesuvianite Stabilitymentioning

confidence: 99%

“…The most detailed studies of rodingites in the world are devoted to occurrences from Xigaze ophiolite in South Tibet (Dai et al, 2016;Duan et al, 2022Duan et al, , 2021Li et al, 2017), from Zermatt-Saas ophiolites in the Alps (Li et al, 2008(Li et al, , 2004Zanoni et al, 2016), and from ophiolites in Greece (Karkalis et al, 2022;Koutsovitis, 2017;Koutsovitis et al, 2013;Rogkala et al, 2022). In the Carpathian Mountains, several rodingitized rock occurrences were described by Hovorka et al (1985) but until now only the occurrence in Dobšiná quarry has been examined in greater detail (Butek et al, 2021;Li et al, 2014;Putiš et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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