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Dive into the research topics where Stéphane Rouméjon is active.

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Featured researches published by Stéphane Rouméjon.


Journal of Petrology | 2018

Alteration Heterogeneities in Peridotites Exhumed on the Southern Wall of the Atlantis Massif (IODP Expedition 357)

Stéphane Rouméjon; Gretchen L. Früh-Green; Beth N. Orcutt; S.L. Green; Carol J. Cotterill; Sally Morgan; Norikatsu Akizawa; G. Bayrakci; Jan Hinrich Behrmann; Emilio Herrero-Bervera; Chiara Boschi; William J. Brazelton; Mathilde Cannat; Kristina G. Dunkel; J. Escartin; Michelle Harris; Kirsten Hesse; Barbara E. John; Susan Q. Lang; Marvin D. Lilley; Hai-Quan Liu; Lisa E. Mayhew; Andrew McGaig; Bénédicte Ménez; Yuki Morono; Marianne Quéméneur; Amila Sandaruwan Ratnayake; Matthew O. Schrenk; Esther M. Schwarzenbach; Katrina I. Twing

Serpentinized and metasomatized peridotites intruded by gabbros and dolerites have been drilled on the southern wall of the Atlantis Massif (Mid-Atlantic Ridge, 30°N) during International Ocean Discovery Program (IODP) Expedition 357. They occur in seven holes from five sites making up an east-west trending, spreading-parallel profile that crosscuts this exhumed detachment footwall. Here we have taken advantage of this sampling to study heterogeneities of alteration at scales less than a kilometer. We combine textural and mineralogical observations made on 77 samples with in situ major and trace element analyses in primary and serpentine minerals to provide a conceptual model for the development of alteration heterogeneities at the Atlantis Massif. Textural sequences and mineralogical assemblages reveal a transition between an initial pervasive phase of serpentinization and subsequent serpentinization and metasomatism focused along localized pathways preferentially used by hydrothermal fluids. We propose that these localized pathways are interconnected and form 100 m- to 1u2009km-sized cells in the detachment footwall. This change in fluid pathway distribution is accompanied by variable trace element enrichments in the serpentine textures: deep, syn-serpentinization fluid-peridotite interactions are considered the source of Cu, Zn, As, and Sb enrichments, whereas U and Sr enrichments are interpreted as markers of later, shallower fluid-serpentinized peridotite interaction. Alteration of gabbros and dolerites emplaced in the peridotite at different lithospheric levels leads to the development of amphibole, chlorite and, or, talc-bearing textures as well as enrichments in LREE, Nb, Y, Th, Ta in the serpentine textures of the surrounding peridotites. Combining these observations, we propose a model that places the drill holes in a conceptual frame involving mafic intrusions in the peridotites and heterogeneities during progressive alteration and emplacement on the seafloor.


Nature Geoscience | 2013

Continuous exhumation of mantle-derived rocks at the Southwest Indian Ridge for 11 million years

Daniel Sauter; Mathilde Cannat; Stéphane Rouméjon; Muriel Andreani; Dominique Birot; Adrien Bronner; Daniele Brunelli; Julie Carlut; Adélie Delacour; Vivien Guyader; Christopher J. MacLeod; Gianreto Manatschal; Véronique Mendel; Bénédicte Ménez; Valerio Pasini; Etienne Ruellan; Roger C. Searle


Earth and Planetary Science Letters | 2017

Assessing sulfur redox state and distribution in abyssal serpentinites using XANES spectroscopy

Baptiste Debret; Muriel Andreani; Adélie Delacour; Stéphane Rouméjon; Nicolas Trcera; H. M. Williams


Proceedings of the Ocean Discovery Program, 357 . | 2017

Expedition 357 methods

Gretchen L. Früh-Green; Beth N. Orcutt; S.L. Green; Carol J. Cotterill; Sally Morgan; Norikatsu Akizawa; G. Bayrakci; Jan Hinrich Behrmann; Chiara Boschi; W.J. Brazleton; Mathilde Cannat; Kristina G. Dunkel; J. Escartin; Michelle Harris; Emilio Herrero-Bervera; Kirsten Hesse; Barbara E. John; Susan Q. Lang; Lilley; Hai-Quan Liu; Lisa E. Mayhew; Andrew M. McCaig; Bénédicte Ménez; Yuki Morono; Marianne Quéméneur; Stéphane Rouméjon; A. Sandaruwan Ratnayake; Matthew O. Schrenk; Esther M. Schwarzenbach; Katrina I. Twing


Geophysical Journal International | 2017

Elastic and electrical properties and permeability of serpentinites from Atlantis Massif, Mid-Atlantic Ridge

Ismael Falcon-Suarez; G. Bayrakci; Timothy A. Minshull; Laurence North; Angus I. Best; Stéphane Rouméjon


Proceedings of the International Ocean Discovery Program, 357 . | 2017

Expedition 357 summary

Gretchen L. Früh-Green; Beth N. Orcutt; S.L. Green; Carol J. Cotterill; Sally Morgan; Norikatsu Akizawa; G. Bayrakci; Jan Hinrich Behrmann; Chiara Boschi; W. J. Brazleton; Mathilde Cannat; Kristina G. Dunkel; J. Escartin; Michelle Harris; Emilio Herrero-Bervera; Kirsten Hesse; Barbara E. John; Susan Q. Lang; Marvin D. Lilley; Hai-Quan Liu; Lisa E. Mayhew; Andrew M. McCaig; Bénédicte Ménez; Yuki Morono; Marianne Quéméneur; Stéphane Rouméjon; A. Sandaruwan Ratnayake; Matthew O. Schrenk; Esther M. Schwarzenbach; Katrina I. Twing


Journal of Geophysical Research | 2012

Serpentinization of oceanic peridotites: 2. Kinetics and processes of San Carlos olivine hydrothermal alteration: KINETICS OF SERPENTINIZATION

Benjamin Malvoisin; Fabrice Brunet; Julie Carlut; Stéphane Rouméjon; Mathilde Cannat


Lithos | 2018

Magmatism, serpentinization and life: Insights through drilling the Atlantis Massif (IODP Expedition 357)

Gretchen L. Früh-Green; Beth N. Orcutt; Stéphane Rouméjon; Marvin D. Lilley; Yuki Morono; Carol J. Cotterill; S.L. Green; J. Escartin; Barbara E. John; Andrew M. McCaig; Mathilde Cannat; Bénédicte Ménez; Esther M. Schwarzenbach; M. Williams; Sally Morgan; Susan Q. Lang; Matthew O. Schrenk; William J. Brazelton; Norikatsu Akizawa; Chiara Boschi; Kristina G. Dunkel; Marianne Quéméneur; Scott A. Whattam; Lisa E. Mayhew; Michelle Harris; G. Bayrakci; Jan Hinrich Behrmann; Emilio Herrero-Bervera; Kirsten Hesse; Hai-Quan Liu


Lithos | 2018

In-situ oxygen isotope analyses in serpentine minerals: Constraints on serpentinization during tectonic exhumation at slow- and ultraslow-spreading ridges

Stéphane Rouméjon; M. Williams; Gretchen L. Früh-Green


Geochemistry Geophysics Geosystems | 2018

Tracking water-rock interaction at the Atlantis Massif (MAR, 30°N) using sulfur geochemistry

J. Liebmann; Esther M. Schwarzenbach; Gretchen L. Früh-Green; C. Boschi; Stéphane Rouméjon; H. Strauss; Uwe Wiechert; Timm John

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G. Bayrakci

University of Southampton

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Bénédicte Ménez

Institut de Physique du Globe de Paris

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J. Escartin

Institut de Physique du Globe de Paris

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Beth N. Orcutt

Bigelow Laboratory For Ocean Sciences

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Chiara Boschi

Pacific Marine Environmental Laboratory

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Lisa E. Mayhew

University of Colorado Boulder

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