Diagenetic carbonates from deep sub-seafloor organic-rich sediments influenced by magmatic sill intrusions (IODP Exp 385-Guaymas Basin, Gulf of California) - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Diagenetic carbonates from deep sub-seafloor organic-rich sediments influenced by magmatic sill intrusions (IODP Exp 385-Guaymas Basin, Gulf of California)

Omar Boudouma
Tobias, W Höfig
Ivano W. Aiello
  • Fonction : Auteur
Janine L. Ash
  • Fonction : Auteur
Diana P. Bojanova
  • Fonction : Auteur
Virginia P. Edgcomb
  • Fonction : Auteur
Christophe Y. Galerne
  • Fonction : Auteur
Verena B. Heuer
  • Fonction : Auteur
Shijun Jiang
  • Fonction : Auteur
Myriam A.C. Kars
  • Fonction : Auteur
Ji-Hoon Kim
  • Fonction : Auteur
Louise M.T. Koornneef
  • Fonction : Auteur
Kathleen M. Marsaglia
  • Fonction : Auteur
Nicolette R. Meyer
  • Fonction : Auteur
Yuki Morono
  • Fonction : Auteur
Raquel Negrete-Aranda
  • Fonction : Auteur
Florian Neumann
  • Fonction : Auteur
Manet Peña-Salinas
  • Fonction : Auteur
Ligia L. Pérez Cruz
  • Fonction : Auteur
Lihua Ran
  • Fonction : Auteur
John A. Sarao
  • Fonction : Auteur
Florian Schubert
  • Fonction : Auteur
S. Khogenkumar Singh
  • Fonction : Auteur
Joann M. Stock
  • Fonction : Auteur
Wei Xie
  • Fonction : Auteur
Toshiro Yamanaka
  • Fonction : Auteur
Guangchao Zhuang
  • Fonction : Auteur

Résumé

During the International Ocean Discovery Program (IODP) Expedition 385, diagenetic carbonates were recovered at different depths (from 10 to 534 mbsf) in six drilling sites (U1545, U1546, U1547, U1548, U1550 and U1552) distributed from the northern spreading segment of the Guaymas Basin (Gulf of California) to ~52 km away from the axial graben. As this basin is a site of active sea floor spreading, hemipelagic diatomaceous and organic-rich sediments rapidly accumulating at all these drilling sites are influenced by magmatic intrusions, at depths greater than 90 mbsf. The geothermal gradient observed ranges from 135 °C/km to 682 °C/km. Except in sites U1547 and U1548, both located close to a circular hydrothermal mound (called Ringvent), sills are in thermal equilibrium with the surrounding sediments. Carbonate samples (over fifty) collected during this expedition are composed of fine-grained micritic sediments and weakly to strongly lithified carbonate concretions. The petrographic observations and XRD analyses show that stoichiometric dolomite is the dominant authigenic carbonate phase, with minor contribution of Fe-rich dolomite, and low- to high-Mg calcite. Centimeter-sized concretions composed of ankerite and Mg-calcite also occur in the sediments collected from the northern axial graben (site U1550) and a site with subsurface gas hydrates (U1552), respectively. Other authigenic minerals are often associated with these carbonates including pyrite, barite, anhydrite, zeolites and crystalline opal (opal-CT). The carbon isotopic compositions of the bulk carbonate from these samples exhibit large variations ranging from -28.9 to +12.0‰ VPDB. Very low d 13C values, only measured in a centimetre-seized concretion associated with cold methane seepage (site U1552), indicate that the bicarbonate used for carbonate precipitation is derived from anaerobic oxidation of methane (AOM) coupled with bacterial sulfate reduction (BSR). The very high d13C values of diagenetic carbonates indicate the use of biogenic 13C-rich CO2 reservoirs related to active methanogenesis or other autotrophic microbial pathways. The oxygen isotopic compositions of these carbonates cover a large range from -5.3 to +4.0‰ VPDB. The decreasing d18O values with increasing depth reflect the effect of high geothermal gradients due to the close proximity of magmatic sills.
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Dates et versions

hal-03866194 , version 1 (22-11-2022)

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Swanne Gontharet, Catherine Pierre, Ewan Pelleter, Sandrine Caquineau, Omar Boudouma, et al.. Diagenetic carbonates from deep sub-seafloor organic-rich sediments influenced by magmatic sill intrusions (IODP Exp 385-Guaymas Basin, Gulf of California). EGU General Assembly 2022, EGU, May 2022, Vienna, Austria. ⟨10.5194/egusphere-egu22-4385⟩. ⟨hal-03866194⟩
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