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<title lang=en>Early Archean serpentine mud volcanoes at Isua, Greenland, as a niche for early life</title>
<creator>Pons, Marie-Laure</creator>
<creator>Quitté, Ghylaine</creator>
<creator>Fujii, Toshiyuki</creator>
<creator>Rosing, Minik T.</creator>
<creator>Reynard, Bruno</creator>
<creator>Moynier, Frédéric</creator>
<creator>Douchet, Chantal</creator>
<creator>Albarède, Francis</creator>
<contributor>Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE) ; École normale supérieure - Lyon (ENS Lyon) - Université Claude Bernard Lyon 1 (UCBL) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Research Reactor Institute ; Kyoto University [Kyoto]</contributor>
<contributor>Natural History Museum of Denmark ; University of Copenhagen (KU)</contributor>
<contributor>Nordic Centre of Earth Evolution (NORDCEE) ; University of Copenhagen (KU)</contributor>
<contributor>Department of Earth and Planetary Sciences [St Louis] ; Washington University in St Louis</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>National Science Foundation ; INSU : Institut National des Sciences de l'Univers; Carslberg Foundation ; Danish National Research Foundation ; ENS LYON / Ecole Normale Superieure de Lyon</contributor>
<description>International audience</description>
<source>ISSN: 0027-8424</source>
<source>EISSN: 1091-6490</source>
<source>Proceedings of the National Academy of Sciences of the United States of America </source>
<publisher>National Academy of Sciences</publisher>
<identifier>insu-00674714</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00674714</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00674714</source>
<source>Proceedings of the National Academy of Sciences of the United States of America , National Academy of Sciences, 2011, 108 (43), pp.17639-17643. 〈10.1073/pnas.1108061108〉</source>
<identifier>DOI : 10.1073/pnas.1108061108</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.1108061108</relation>
<language>en</language>
<subject lang=en>hydrothermal fluids</subject>
<subject lang=en>serpentinization</subject>
<subject lang=en>origin of life</subject>
<subject lang=en>subduction zone</subject>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Isua Supracrustal Belt, Greenland, of Early Archean age (3.81-3.70 Ga) represents the oldest crustal segment on Earth. Its complex lithology comprises an ophiolite-like unit and volcanic rocks reminiscent of boninites, which tie Isua supracrustals to an island arc environment. We here present zinc (Zn) isotope compositions measured on serpentinites and other rocks from the Isua supracrustal sequence and on serpentinites from modern ophiolites, midocean ridges, and the Mariana forearc. In stark contrast to modern midocean ridge and ophiolite serpentinites, Zn in Isua and Mariana serpentinites is markedly depleted in heavy isotopes with respect to the igneous average. Based on recent results of Zn isotope fractionation between coexisting species in solution, the Isua serpentinites were permeated by carbonate- rich, high- pH hydrothermal solutions at medium temperature (100-300 degrees C). Zinc isotopes therefore stand out as a pH meter for fossil hydrothermal solutions. The geochemical features of the Isua fluids resemble the interstitial fluids sampled in the mud volcano serpentinites of the Mariana forearc. The reduced character and the high pH inferred for these fluids make Archean serpentine mud volcanoes a particularly favorable setting for the early stabilization of amino acids.</description>
<date>2011-10-25</date>
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