التفاصيل البيبلوغرافية
| العنوان: |
Carbonate Diagenesis Related to Methane-rich Fluid Migration on Continental Margins : Example of the Dolomite Concretions in the Neogene Marls of South-East Spain. |
| المؤلفون: |
Pierre, Catherine, Rouchy, J. M., Blanc-Valleron, M. M. |
| المساهمون: |
Cycles biogéochimiques marins : processus et perturbations (CYBIOM), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU), Muséum national d'Histoire naturelle (MNHN), AGU |
| المصدر: |
American Geophysical Union, Fall Meeting 2018 ; https://hal.archives-ouvertes.fr/hal-02391622Test ; American Geophysical Union, Fall Meeting 2018, AGU, Dec 2018, Washington, D.C., United States. pp.abstract #PP41E-1880 |
| بيانات النشر: |
HAL CCSD |
| سنة النشر: |
2018 |
| المجموعة: |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
| مصطلحات موضوعية: |
0473 Paleoclimatology and paleoceanography, BIOGEOSCIENCESDE: 1051 Sedimentary geochemistry, GEOCHEMISTRYDE: 3675 Sedimentary petrology, MINERALOGY AND PETROLOGYDE: 4863 Sedimentation, OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
| جغرافية الموضوع: |
Washington, D.C., United States |
| الوصف: |
International audience ; The Tortonian, Messinian and lower Pliocene marly sediments in S.E. Spain basins (Fortuna, Murcia, Lorca, Aledo, Huercal Overa, Vera) contain abundant authigenic dolomite concretions. The concretions are essentially composed of pure dolomite with a composition from stoichiometry to iron-rich. The oxygen and carbon isotopic compositions of these dolomites exhibit wide ranges (-7.9 < δ18O‰ VPDB < +6.3; -35.5 < δ13C‰ VPDB < +9.8) indicating that carbonate precipitation occurred within the marly sediments due to circulation of fluids of various composition. The low δ18O values indicate that relatively warm fluids were migrating through faults system whereas the high δ18O values characterize either restricted evaporitic conditions or 18O-rich water issued from clay minerals dehydration or gas hydrates dissociation. The low δ13C values are indicative of anaerobic oxidation of methane whereas the high δ13C values are related to methanogenesis, both processes promoting the increase of alkalinity in pore solutions and thus leading to carbonate precipitation. High methane concentrations in the migrating fluids are thought to have created locally gas hydrate reservoirs that were dissociated after the abrupt sea level fall during the Messinian salinity crisis. Finally, the methane-rich fluid seepage was always active during the Pliocene in the Vera basin, which was the only one in SE Spain reflooded by the Pliocene marine waters.The authigenic dolomite concretions are testifying of intense methane-rich fluid migration through faulting and fracturing of the sedimentary deposits that was active during a long period of at least 7 Myrs, where tectonic uplift and major paleoenvironmental changes occurred in the Mediterranean sea. |
| نوع الوثيقة: |
conference object |
| اللغة: |
English |
| العلاقة: |
hal-02391622; https://hal.archives-ouvertes.fr/hal-02391622Test; BIBCODE: 2018AGUFMPP41E1880P |
| الإتاحة: |
https://hal.archives-ouvertes.fr/hal-02391622Test |
| رقم الانضمام: |
edsbas.F55C5387 |
| قاعدة البيانات: |
BASE |
