 | Fernandez-Turiel, J.L., Garcia-Valles, M., Gimeno-Torrente, D., Saavedra-Alonso, J., Martinez-Manent, S. (2005) The hot spring and geyser sinters of El Tatio, Northern Chile. Sedimentary Geology, 180 (3) 125-147 doi:10.1016/j.sedgeo.2005.07.005 | Journal (article/letter/editorial) | | The hot spring and geyser sinters of El Tatio, Northern Chile J.L. Fernandez-Turiel a,*, M. Garcia-Valles...siliceous sinter deposits of El Tatio geothermal field in northern Chile have been examined petrographically...mineralogically. These sinters consist of amorphous silica (opal-A) deposited around hot springs and geysers from...dryness are the main processes that control the opal-A deposition in both subaqueous and subaerial settings...water temperature = 70â86 8C (boiling point at El Tatio: 4200 m a.s.l.); coarse laminated sinter macrostructure |  | Garcia-Valles, M., Fernandez-Turiel, J.L., Gimeno-Torrente, D., Saavedra-Alonso, J., Martinez-Manent, S . (2008) Mineralogical characterization of silica sinters from the El Tatio geothermal field, Chile. American Mineralogist, 93 (8) 1373-1383 doi:10.2138/am.2008.2583 | Journal (article/letter/editorial) | | characterization of silica sinters from the El Tatio geothermal field, Chile M. Garcia-Valles,1,* J.L. Fernandez-Turiel...alkali chloride waters in the El Tatio geothermal field in northern Chile (22°20'S, 68°01'W), have been...The dominant silica phase is opal-A. Minor contents of opal-A/-CT and opal-CT are also present together...immature nature of the studied opal-A. DTA heating experiments of opal-A show cristobalite crystallization...water attached to silanols. Keywords: Opal-A, opal-A/-CT, opal-CT, XRD, TG, DTA, FTIR Introduction Noncrystalline |  | Gong, Jian, Myers, Kimberly D., Munoz-Saez, Carolina, Homann, Martin, Rouillard, Joti, Wirth, Richard, Schreiber, Anja, van Zuilen, Mark A. (2020) Formation and Preservation of Microbial Palisade Fabric in Silica Deposits from El Tatio, Chile. Astrobiology, 20 (4) 500-524 doi:10.1089/ast.2019.2025 | Journal (article/letter/editorial) | | Microbial Palisade Fabric in Silica Deposits from El Tatio, Chile Jian Gong,1,* Kimberly D. Myers,1 Carolina...silicified palisade fabrics from a geyser in El Tatio, Chile, tracing the progressive degradation of microorganisms...efficiently generated in a highly evaporative geothermal field, and that these biosignatures can be most...conditions. Key Words: Silica sinterâBiosignatureâEl TatioâSheathed cyanobacteriaâExperimental diagenesisâMars...Geotermia de los Andes (CEGA), Universidad de Chile, Santiago, Chile. CNRS-UMR6538 Laboratoire GeÌosciences |  | Teece, Bronwyn L., George, Simon C., Djokic, Tara, Campbell, Kathleen A., Ruff, Steven W., Van Kranendonk, Martin J. (2020) Biomolecules from Fossilized Hot Spring Sinters: Implications for the Search for Life on Mars. Astrobiology, 20 (4) 537-551 doi:10.1089/ast.2018.2018 | Journal (article/letter/editorial) | | organic geochemistry of hot spring samples from El Tatio, Chile and the Taupo Volcanic Zone, with ages varying...No aromatic compounds were detected in a *9.4 ka opal-A sample or in a modern sinter breccia sample. All...mature distribution that is perhaps reflective of geothermal fluids migrating from deep, rather than surface...matrix of various silica phase minerals (e.g., opal-A, opal-CT/C, microcrystalline quartz or chert: Walter...(amorphous) opal-A. As sinter undergoes diagenesis, opal-A transforms to paracrystalline opal-CT, followed |  | Wostbrock, Jordan A.G., Sharp, Zachary D., Sanchez-Yanez, Camilo, Reich, Martin, van den Heuvel, Daniela B., Benning, Liane G. (2018) Calibration and application of silica-water triple oxygen isotope thermometry to geothermal systems in Iceland and Chile. Geochimica et Cosmochimica Acta, 234. 84-97 doi:10.1016/j.gca.2018.05.007 | Journal (article/letter/editorial) | | oxygen isotope thermometry to geothermal systems in Iceland and Chile Jordan A.G. Wostbrock a,â, Zachary...and Andean Geothermal Center of Excellence (CEGA), FCFM, Universidad de Chile, Santiago, Chile c University...isotope analyses were made on geothermal ïŹuids and precipitates from Chile and Iceland to calibrate the...cold waters. In contrast to samples from the geothermal plant, natural amorphous silica precipitates...(T = 63â84 °C) in the Puchuldiza geothermal area of northern Chile gave temperature estimates from the |  | | Journal (article/letter/editorial) | | Tracing the continental diagenetic loop of the opal-a to opal-CT transformation with X-ray diffraction Moritz...Tracing the continental diagenetic loop of the opal-a to opal-CT transformation with X-ray diffraction, Sedimentary...Tracing the continental diagenetic loop of the opal-A to opal-CT transformation with X-ray diffraction Authors...identification and categorization of the gradual opal-A to opal-CT transformation remains challenging due to...parameters that characterize the maturation from opal-A to opal-CT in pr continental settings. We analyzed |  | | Journal (article/letter/editorial) | | freezing temperatures on the morphology of cryogenic opal-A (COA): Implications for past climates on Mars...freezing temperatures on the morphology of cryogenic opal-A (COA): implications for past climates on Mars...(joanna.hogancamp@nasa.gov) Highlights: Cryogenic opal-A made in H2SO4 solutions is more angular than COA...Cryogenic opal-A particle size decreases with decreasing freezing temperature. ï· Cryogenic opal-A morphology...Cryogenic opal-A (COA) is a type of hydrated amorphous silica that forms when silica-rich geothermal fluids |  | Hopf, J., Eskelsen, J.R., Chiu, M., Ievlev, A.V., Ovchinnikova, O.S., Leonard, D., Pierce, E.M. (2018) Toward an understanding of surface layer formation, growth, and transformation at the glassâfluid interface. Geochimica et Cosmochimica Acta, 229. 65-84 doi:10.1016/j.gca.2018.01.035 | Journal (article/letter/editorial) | | structure of the hydrated layer closely resembles opal-AG (amorphous gel-like) with an average 2 crystallite...reason for the discrepancy between laboratory and field measured weathering rates is the formation of altered...from measurement artifact caused by changes in the field evaporation rate for the multi-layered structure...units create a hydrated layer that closely resembles opal-AG (gel-like) and represents a random packing of...(bright field and dark-field) and EDS mapping were performed using a Hitachi HF3300 cold field emission |  | Sun, Z., Zhou, H., Glasby, G. P., Sun, Z., Yang, Q., Yin, X., Li, J. (2013) Mineralogical characterization and formation of Fe-Si oxyhydroxide deposits from modern seafloor hydrothermal vents. American Mineralogist, 98 (1) 85-97 doi:10.2138/am.2013.4147 | Journal (article/letter/editorial) | | silica. As a result, significant precipitation of opal-A occurred through inorganic polymerization. However...southern and northern VFR. The Hine Hina hydrothermal field on the southern VFR is in a volcanic stage and is...400 °C in the Vai Lili and âŒ365 °C in the Mariner field (Takai et al. 2008). Nonetheless, diffuse discharge...this area (LĂ©cuyer et al. 1999). The White Church field in the northern VFR is in the tectonic stage and...faults (LĂ©cuyer et al. 1999). A new hydrothermal field at 176°11âČW, 20°40âČS was discovered by Video Camera |  | Beaty, D. W., Grady, M. M., McSween, H. Y., Sefton-Nash, E., Carrier, B. L., Altieri, F., Amelin, Y., Ammannito, E., Anand, M., Benning, L. G., Bishop, J. L., Borg, L. E., Boucher, D., Brucato, J. R., Busemann, H., Campbell, K. A., Czaja, A. D., Debaille, V., Des Marais, D. J., Dixon, M., Ehlmann, B. L., Farmer, J. D., Fernandez-Remolar, D. C., Filiberto, J., Fogarty, J., Glavin, D. P., Goreva, Y. S., Hallis, L. J., Harrington, A. D., Hausrath, E. M., Herd, C. D. K., Horgan, B., Humayun, M., Kleine, T., Kleinhenz, J., Mackelprang, R., Mangold, N., Mayhew, L. E., McCoy, J. T., McCubbin, F. M., McLennan, S. M., Moser, D. E., Moynier, F., Mustard, J. F., Niles, P. B., Ori, G. G., Raulin, F., Rettberg, P., Rucker, M. A., Schmitz, N., Schwenzer, S. P., Sephton, M. A., Shaheen, R., Sharp, Z. D., Shuster, D. L., Siljeström, S., Smith, C. L., Spry, J. A., Steele, A., Swindle, T. D., ten Kate, I. L., Tosca, N. J., Usui, T., Van Kranendonk, M. J., Wadhwa, M., Weiss, B. P., Werner, S. C., Westall, F., Wheeler, R. M., Zipfel, J., Zorzano, M. P. (2019) The potential science and engineering value of samples delivered to Earth by Mars sample return. Meteoritics & Planetary Science, 54. doi:10.1111/maps.13242 | Journal (article/letter/editorial) | | established at S8 3. 4. 5. 6. D.W. Beaty et al. field area- to outcrop- to hand sample- to hand lens scale...Coupled to all of this was the rapid growth of the field of astrobiology, catalyzed by McKay et al.âs (1996)...context through orbital imaging. (2) Establish local field context through the operation of instrumented rovers...signatures of minerals. It is the integration of field (planetary, regional, local) data with sample data...orbiters. (B) Local context will be established at field area- to outcropto hand sample- to hand lens scale |  | Kogel, Jessica Elzea, Trivedi, Nikhil C., Barker, James M., Krukowski, Stanley T. - Eds. (2006) Industrial Minerals and Rocks (7th ed.) Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO. | Book (edition) | | admiration for his countless contributions to the field of industrial minerals, we dedicate this 7th edition...the professional development of geologists in the field of nonmetalliferous geology. Robert Dreyer received...Harvey GNS Science Taupo, New Zealand Hassan E. El-Shall Kip Jeffrey Department of Materials Science...Wyoming Ayman El-Midany George C. Hawley and Associates Brossard, Quebec, Canada Hassan E. El-Shall National...Zaman CTH Ltd. Consultants Santiago-La Reina, Chile R. David Thomas Jr. Department of Materials Science |
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