 | | Journal (article/letter/editorial) | | outer cores and magnesite rims. Isolated areas of ankerite appear to be isotopically lighter with δ18 O ¾...rosettes in ALH84001 and two areas containing ankerite. 2. Experimental We studied a single 11 mg chip...did not observe any rosette cores consisting of ankerite–calcite, as described by [10]. We did locate a...few small pockets of carbonate containing impure ankerite (ranging in composition from Mg40 Cc21 Sd35 Rh4...(black). Two areas containing ankerite are indicated by a. No ankerite was found in the cores of the |  | | Journal (article/letter/editorial) | | carbonate: Possible evidence for water precipitation on Mars G. HOLLAND,* J. M. SAXTON, I. C. LYON, and G. TURNER...carbonate. The textural relationship between this ankerite and carbonate rosettes is unclear. The present...other standard) 18O/16O ratios obtained from an ankerite standard showing a 1 scatter of 2‰ over periods...of pure calcite, pure magnesite, pure siderite, ankerite of composition Ca51Mg22Fe25Mn02 and dolomite of...Leshin et al., 1998) (␦18O ‰) Magnesite Siderite Ankerite Dolomite Calcite –8.4 –7.6 ⫹9.8 ⫹7.7 ⫹10.4 –15 |  | | Journal (article/letter/editorial) | | com/locate/epsl The nakhlite hydrothermal brine on Mars J.C. Bridges a,n, S.P. Schwenzer b a b Space Research...modelling. We show that the nakhlite parent rocks on Mars encountered a CO2-rich hydrothermal fluid at 150...Keywords: Mars nakhlite hydrothermal brine phyllosilicate carbonate 1. Introduction Mars research focuses...2011). In order to assess the past habitability of Mars for microbial life it is necessary to have an accurate...type associated with large impact structures across Mars. n Corresponding author. E-mail address: j.bridges@le |  | Golden, D.C., Ming, Douglas W., Schwandt, Craig S., Lauer, Howard V., Socki, Richard A., Morris, Richard V., Lofgren, Gary E., McKay, Gordon A. (2001) A simple inorganic process for formation of carbonates, magnetite, and sulfides in Martian meteorite ALH84001. American Mineralogist, 86 (3) 370-375 doi:10.2138/am-2001-2-321 | Journal (article/letter/editorial) | | pyrite to magnetite + pyrrhotite and left the ankerite and magnesite virtually unaffected. The final...Step 1 0.45 0.3 1.8 3.0 0 15 7 ankerite Step 2 0 1.5 0 1.5 0.16 15 1 ankerite, siderite, pyrite Step 3 0...3.75 0 15 10 ankerite, siderite, pyrite, magnesite Step 4 0 1.5 0 1.5 0.16 15 1 ankerite, siderite, pyrite...Heat at 20 °C/min to 470 °C in CO2 at 13.3 kPa ankerite, magnetite, pyrrhotite, magnesite Note: In steps...formation. Carbon isotope analyses of single-phase ankerite, siderite, and magnesite that we synthesized hydrothermally |  | Fernández-Remolar, David C., Preston, Louisa J., Sánchez-Román, Mónica, Izawa, Matthew R.M., Huang, L., Southam, Gordon, Banerjee, Neil R., Osinski, Gordon R., Flemming, Roberta, Gómez-Ortíz, David, Prieto Ballesteros, Olga, Rodríguez, Nuria, Amils, Ricardo, Darby Dyar, M. (2012) Carbonate precipitation under bulk acidic conditions as a potential biosignature for searching life on Mars. Earth and Planetary Science Letters, 351. 13-26 doi:10.1016/j.epsl.2012.07.015 | Journal (article/letter/editorial) | | as a potential biosignature for searching life on Mars David C. Fernández-Remolar a,n, Louisa J. Preston...conditions were likely predominant in vast regions of Mars over the last four billion years of planetary evolution...could also be preserved on Mars. Such carbonates could soon be observed by the Mars Science Laboratory, and...conditions Rı́o Tinto Mars Astrobiology 1. Introduction Recent detections of carbonates on Mars from orbital...al., 2010) instruments has refreshed the idea of Mars as a habitable planet. This hypothesis is largely |  | Nakada, Ryoichi, Tanabe, Gaku, Kajitani, Iori, Usui, Tomohiro, Shidare, Masashi, Yokoyama, Tetsuya (2021) EXAFS Determination of Clay Minerals in Martian Meteorite Allan Hills 84001 and Its Implication for the Noachian Aqueous Environment. Minerals, 11 (2) 176 doi:10.3390/min11020176 | Journal (article/letter/editorial) | | +81-88-878-2192 Abstract: The aqueous environment of ancient Mars is of significant interest because of evidence suggesting...large amount of liquid water on the surface of early Mars [1–5]. Observations by both the orbiter and rover...compact reconnaissance imaging spectrometer for Mars (CRISM) categorized the types and distribution of...that Fe-bearing carbonates such as siderite and ankerite dominate the Fe species in the ALH carbonate,...species and assess the ancient aqueous environment of Mars. We also conducted a µ-EXAFS analysis of Fe in silica |  | | Journal (article/letter/editorial) | | 19 achondrites believed to come from the crust of Mars (McSween, 1985, 1994). Several of the SNCs contain...making up most of the image is ⬃En70 orthopyroxene. Ankerite domains and carbonate concretions (see text and...compositions approximately in the middle of the ankerite/magnesio-siderite solvus but may contain patches...displays no textural organization (i.e., most massive ankerite is in direct contact with orthopyroxene or glass...position). Finally, orthopyroxenes associated with ankerite domains are present not only as an enclosing matrix |  | | Journal (article/letter/editorial) | | biologically critical compounds (CO2 , H2 O) on early Mars. Similar carbonates have been found in xenoliths...activity was probably common and widespread on Early Mars, which featured abundant basaltic rocks, water as...present on early Mars. 5 2002 Elsevier Science B.V. All rights reserved. Keywords: Mars; ALH84001; Spitsbergen;...Spitsbergen; hydrothermal; siderite; magnesite; ankerite 1. Introduction * Corresponding author. Tel.:...ancient crust of Mars, and so is one of a very few sources of data about volatiles on early Mars. ALH84001 crystallized |  | | Journal (article/letter/editorial) | | from aqueous solution while the rock was still on Mars. The nakhlite Lafayette also contains Fe-rich, clay-bearing...likelihood of past hydrothermal activity on the planet Mars. Allan Hills 84001 is an igneous orthopyroxenite;...played an important role in past surface processes on Mars (Carr, 198 1, 1996). Evidence for the presence of...water on the surface and in the shallow crust of Mars implies that past martian crustal evolution may...meteorites, which are thought to have originated on Mars, indicates that the parent rocks of many of these |  | Moyano-Cambero, Carles E., Trigo-Rodríguez, Josep M., Benito, M. Isabel, Alonso-Azcárate, Jacinto, Lee, Martin R., Mestres, Narcís, Martínez-Jiménez, Marina, Martín-Torres, Francisco J., Fraxedas, Jordi (2017) Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001. Meteoritics & Planetary Science, 52 (6) 1030-1047 doi:10.1111/maps.12851 | Journal (article/letter/editorial) | | information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and...carbonates in ALH 84001 in 1984. It was ejected from Mars 15 Myr ago (Nyquist et al. 2001), and fell to Earth...Noachian crust, which forms the ancient highlands of Mars (Hamilton et al. 2003). As this meteorite is the...earliest conditions and subsequent evolution of Mars (Bridges et al. 2001). Once it was recognized as...progressive deformation by impacts while it was still on Mars (Treiman 1995). In fact, the meteorite has a complicated |  | | Journal (article/letter/editorial) | | as different from diogenites and originating on Mars (Mittlefehldt, 1994a), based principally on oxygen...preterrestrial alteration materials of magnesite-siderite-ankerite carbonates and pyrite, an assemblage not identified...additional view of igneous and chemical processes on Mars. During examination of petrography of ALH84001,...of layers and compositions: a central zone of ankerite, grading outward to ferroan magnesite (bremmerite)...100 pm Rounded globules of siderite-magnesite-ankerite solid solutions with intricate chemical zoning |  | GOLDEN, D. C., MING, D. W., SCHWANDT, C. S., MORRIS, R. V., YANG, S. V., LOFGREN, G. E. (2000) An experimental study on kinetically-driven precipitation of calcium-magnesium-iron carbonates from solution: Implications for the low-temperature formation of carbonates in martian meteorite Allan Hills 84001. Meteoritics & Planetary Science, 35 (3) 457-465 doi:10.1111/j.1945-5100.2000.tb01428.x | Journal (article/letter/editorial) | | 0 4 0 0 0 Ankerite-siderite, magnetite Ankerite, magnesite Ankerite, magnesite Ankerite, magnesite Amorphous...produce spherical globules or globule clusters of ankerite-siderite mineralogy (Fig. 1a). Globules range...edge of the globule. The central Fe-rich core, ankerite zone, and the outermost Mg-rich rim of synthetic...under high magnification (Fig. 4c). Although these ankerite-siderite globules exhibit Ca-Mg-zoning, compositionally...experiment 2) consist of globules with magnesite and ankerite mineralogy (Fig. 1b). I 5000 cpm a RESULTS |  | | Journal (article/letter/editorial) | | the micronscale with calcite (CaCO3), dolomite-ankerite (CaMg(CO3)2CaFe(CO3)2) and magnesite-siderite...with metastable compositions between dolomite-ankerite and magnesite-siderite are observed. The rosettes...cores (rarely calcite, but more often Mg-bearing ankerite) towards less Ca-rich compositions nearly on the...have been produced by fluid-rock interaction on Mars (e.g., Romanek et al., 1994; Jull et al., 1995;...range of carbonate compositions from Mg-bearing ankerite to nearly pure magnesite (Fig. 2). The d18O values |  | | Journal (article/letter/editorial) | | minerals; alkali magmatism; quartz syenite; oceanite; Mars This is a 'preproof' accepted article for Clay...of mugearite-type basalts in the Gale Crater on Mars by the Curiosity Rover of the MSL mission (Stolper...of clays under dry climate (an ongoing issue for Mars, see for example Cannon et al., 2017). REGIONAL...corrected by analyzing reference material: DPA (ankerite) and BRET « in-home » standards for carbonate...display chemical zonation ranging from siderite to ankerite and finally to calcite (Fig. 3b). Chlorite-like |  | Melwani Daswani, Mohit, Schwenzer, Susanne P., Reed, Mark H., Wright, Ian P., Grady, Monica M. (2016) Alteration minerals, fluids, and gases on early Mars: Predictions from 1-D flow geochemical modeling of mineral assemblages in meteorite ALH 84001. Meteoritics & Planetary Science, 51 (11) 2154-2174 doi:10.1111/maps.12713 | Journal (article/letter/editorial) | | Alteration minerals, fluids, and gases on early Mars: Predictions from 1-D flow geochemical modeling... although ubiquitous on the ancient terrains of Mars, have not been observed in Martian meteorite Allan...chlorite, all of which have been previously detected on Mars. We also calculated host rock replacement in local...(Thomson et al. 2011; Deit et al. 2013) Gale crater on Mars, the absence of secondary phyllosilicates in the...minerals are ubiquitous on the ancient terrains of Mars and the secondary carbonates in the meteorite are |  | Thomas-Keprta, K.L., Clemett, S.J., McKay, D.S., Gibson, E.K., Wentworth, S.J. (2009) Origins of magnetite nanocrystals in Martian meteorite ALH84001. Geochimica et Cosmochimica Acta, 73 (21) 6631-6677 doi:10.1016/j.gca.2009.05.064 | Journal (article/letter/editorial) | | evidence of interaction with aqueous fluids while on Mars in the form of microscopic carbonate disks. These...3.9 Ga ago at beginning of the Noachian epoch on Mars during which both the oldest extant Martian surfaces...during shock impacts while the meteorite was on Mars. The majority of these carbonates appear as circular...events, the last resulting in its ejection from Mars, e.g., Treiman (1998). In general, the peak shock...for calcite (CaCO3), dolomite (Mg,Ca(CO3)2) – ankerite (Ca,Fe(CO3)2), and the complete magnesite-siderite |  | | Journal (article/letter/editorial) | | an igneous orthopyroxenite which crystallized on Mars around 4.4 Gyr (Nyquist et al. 2001). It contains...globules with magnesite-breunnerite rims and siderite-ankerite cores (e.g., Fig. 20 in McSween and Treiman [1998])...carbonate. These do not exclude the possibility of ankerite, a term we apply only when electron diffraction...contain the extra reflections appropriate to the R3 (ankerite) structure and that are absent for the R3c (calcite)...carbonate: a) blocky microstructure created in ankerite by displacements on 2 different sets of crystallographic |  | Lopez-Reyes, Guillermo, Rull, Fernando, Venegas, Gloria, Westall, Frances, Foucher, Frédéric, Bost, Nicolas, Sanz, Aurelio, Catalá-Espí, Alejandro, Vegas, Alberto, Hermosilla, Isaac, Sansano, Antonio, Medina, Jesus (2014) Analysis of the scientific capabilities of the ExoMars Raman Laser Spectrometer instrument. European Journal of Mineralogy, 25 (5) 721-733 doi:10.1127/0935-1221/2013/0025-2317 | Journal (article/letter/editorial) | | maximum scientific return from the instrument once on Mars, a simulator of the SPDS system has been built to...Agency’s future ExoMars mission will send a rover to Mars in 2018 with a payload of scientific instruments...and try to establish whether life ever existed on Mars (ESA, 2012). To do so, the ExoMars rover is equipped...obtained by a drill from two meters down the surface of Mars (Vago et al., 2006; Rull, 2012). The RLS, in its...scientific capabilities of the instrument once on Mars, as well as the study of processing techniques which |  | Neave, David A., Black, Martin, Riley, Teal R., Gibson, Sally A., Ferrier, Graham, Wall, Frances, Broom-Fendley, Sam (2016) On the Feasibility of Imaging Carbonatite-Hosted Rare Earth Element Deposits Using Remote Sensing. Economic Geology, 111 (3) 641-665 doi:10.2113/econgeo.111.3.641 | Journal (article/letter/editorial) | | Reflection Radiometer (ASTER) instrument (Rowan and Mars, 2003; Mars and Rowan, 2011). However, the coarse spatial...published to date was at Mountain Pass (Rowan and Mars, 2003). Mapping REErich rocks at finer spatial and...remote sensing in imaging REE deposits (Rowan and Mars, 2003). Furthermore, Boesche et al. (2015) successfully...(Christensen et al., 2000; Ninomiya et al., 2005; Mars and Rowan, 2011). Whole-rock compositions of 13...Aeg = aegerine, Amph = alkali amphibole, Ank = ankerite, Ap = apatite, B2S-B3S = intermediate fluorocarbonates |  | Greenberger, Rebecca N., Mustard, John F., Cloutis, Edward A., Pratt, Lisa M., Sauer, Peter E., Mann, Paul, Turner, Kathryn, Dyar, M. Darby, Bish, David L. (2015) Serpentinization, iron oxidation, and aqueous conditions in an ophiolite: Implications for hydrogen production and habitability on Mars. Earth and Planetary Science Letters, 416. 21-34 doi:10.1016/j.epsl.2015.02.002 | Journal (article/letter/editorial) | | Implications for hydrogen production and habitability on Mars Rebecca N. Greenberger a,∗ , John F. Mustard a ...online xxxx Editor: C. Sotin Keywords: habitability Mars analog serpentine hyperspectral imaging stable isotopes...in association with the Canadian Space Agency’s Mars Methane Analogue Mission. We also analyzed stable...aqueous conditions that formed serpentinites on Mars and their habitability. © 2015 Elsevier B.V. All...atmospheric methane on Mars and localized, episodic release of methane detected by the Mars Science Lab- * |  | | Journal (article/letter/editorial) | | a series ofpapers on Allan Hills 84001 and early Mars) Abstract-Understanding the origin of carbonate...between the end-members dolomite, CaMg(CO&, and ankerite, CaFe(CO&. Dolomite(ss) can contain excess Ca...minerals are Do1 = dolomite, CaMg(CO,),; and Ank = ankerite, CaFe(CO,),. Shaded field and filled circles are...ODMG J. (1992) Soil mineralogy and chemistry on Mars: Possible clues from salts and clays in SNC meteorites...components in EETA 79001 (abstract). In Workshop on the Mars Surface and Atmosphere Through Time (eds. R. M. |  | | Journal (article/letter/editorial) | | ALH84001 preserve a record of aqueous processes on Mars at 3.9 Ga, and have been suggested to contain signatures...understanding possible evidence for life on Mars, the history of water on Mars, and the evolution of the martian...concentric chemical zoning consists of an inner core of ankerite or Ca-rich breunnerite, which gradually transitions...meteorite ALH84001 samples the ancient crust on Mars (⬃4.5 Ga) (Jagoutz et al., 1994; Nyquist et al.... and the history of water, and possibly life on Mars. The formation environment of the ALH84001 carbonates |  | | Journal (article/letter/editorial) | | carbonates up to þ 45ø – very similar to dolomite and ankerite from Cl chondrites (Saxton et al., 2000) and bulk...their doubts on an origin of SNC meteorites from Mars, based on their rare gas isotope data. This list...believers in the igneous origin of SNC meteorites on Mars (Wood and Ashwal, 1981). Brandenburg (1996) – being...coming from Mars – consequently concluded that carbonaceous chondrites must come from Mars. Treiman, however...(abstract). Meteoritics 14: 356 Brandenburg JE (1996) Mars as the parent body of the Cl carbonaceous chondrites |  | CIGOLINI, Corrado, DI MARTINO, Mario, LAIOLO, Marco, COPPOLA, Diego, ROSSETTI, Piergiorgio, MORELLI, Marco (2012) Endogenous and nonimpact origin of the Arkenu circular structures (al‐Kufrah basin—SE Libya) Meteoritics & Planetary Science, 47 (11) 1772-1788 doi:10.1111/maps.12012 | Journal (article/letter/editorial) | | alteration. Secondary phases are sericite, carbonate, ankerite, and Fe-Mn oxides. Sparse zircon, apatite, and... Nonimpact origin of Arkenu craters carbonate, ankerite, and Fe-Mn oxides (in veinlets). Zircon, apatite...phases. Additional matrix minerals are calcite and ankerite, apatite, Fe-Mn oxides. In more altered samples...K-feldspar replaces sodalite; secondary carbonate and ankerite are common and coexist with zeolites. Accessory...abundant hydrous minerals, secondary calcite, ankerite, and patches of zeolites. Lamprophyric rocks of |  | Wang, Rui, Cudahy, Tom, Laukamp, Carsten, Walshe, John L., Bath, Adam, Mei, Yuan, Young, Carl, Roache, Tony J., Jenkins, Andrew, Roberts, Malcolm, Barker, Andrew, Laird, Jamie (2017) White Mica as a Hyperspectral Tool in Exploration for the Sunrise Dam and Kanowna Belle Gold Deposits, Western Australia. Economic Geology, 112 (5) 1153-1176 doi:10.5382/econgeo.2017.4505 | Journal (article/letter/editorial) | | assemblage is disseminated phengite + albite + quartz + ankerite + pyrite (Fig. 8A, B) ± rare magnetite. No paragonite...characteristic. The ankerite comprises both late-stage Fe-rich overgrowths and earlier Mg-rich ankerite cores within...within veins. The Fe ankerite also formed crosscutting veinlets (Fig. 8C). In the weakly altered (=gold...mineralogical assemblage is quartz + calcite + ankerite + paragonite + muscovite ± chlorite (Fig. 12A–D)...in the highly altered zone, including calcite, ankerite, and dolomite. Sparse dolomite forms in the early |
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