caa a22 4500 463216350 CHVBK 20180405153157.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00367-007-0077-z doi (NATIONALLICENCE)springer-10.1007/s00367-007-0077-z Gas hydrate disturbance fabrics of southern Hydrate Ridge sediments (ODP Leg 204): Relationship with texture and physical properties [Elektronische Daten] [Elena Piñero, Eulàlia Gràcia, Francisca Martínez-Ruiz, Juan Larrasoaña, Alexis Vizcaino, Gemma Ercilla] Soupy and mousse-like fabrics are disturbance sedimentary features that result from the dissociation of gas hydrate, a process that releases water. During the core retrieval process, soupy and mousse-like fabrics are produced in the gas hydrate-bearing sediments due to changes in pressure and temperature conditions. Therefore, the identification of soupy and mousse-like fabrics can be used as a proxy for the presence of gas hydrate in addition to other evidence, such as pore water freshening or anomalously cool temperature. We present here grain-size results, mineralogical composition and magnetic susceptibility data of soupy and mousse-like samples from the southern Hydrate Ridge (Cascadia accretionary complex) acquired during Leg 204 of the Ocean Drilling Program. In order to study the relationship between sedimentary texture and the presence of gas hydrates, we have compared these results with the main textural and compositional data available from the same area. Most of the disturbed analyzed samples from the summit and the western flank of southern Hydrate Ridge show a mean grain size coarser than the average mean grain size of the hemipelagic samples from the same area. The depositional features of the sediments are not recognised due to disturbance. However, their granulometric statistical parameters and distribution curves, and magnetic susceptibility logs indicate that they correspond to a turbidite facies. These results suggest that gas hydrates in the southern Hydrate Ridge could form preferentially in coarser grain-size layers that could act as conduits feeding gas from below the BSR. Two samples from the uppermost metres near the seafloor at the summit of the southern Hydrate Ridge show a finer mean grain-size value than the average of hemipelagic samples. They were located where the highest amount of gas hydrates was detected, suggesting that in this area the availability of methane gas was high enough to generate gas hydrates, even within low-permeability layers. The mineralogical composition of the soupy and mousse-like sediments does not show any specific characteristic with respect to the other samples from the southern Hydrate Ridge. Springer-Verlag, 2007 Piñero Elena Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut Gràcia Eulàlia Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut Martínez-Ruiz Francisca Instituto Andaluz de Ciencias de la Tierra (CSIC/Universidad de Granada) Facultad de Ciencias, Campus Fuentenueva, 18002, Granada, Spain aut Larrasoaña Juan Laboratori de Paleomagnetisme, Institut de Ciències de la Terra "Jaume Almera” (CSIC)/Universitat de Barcelona, c/ Lluís Solé i Sabarís s/n, 08028, Barcelona, Spain aut Vizcaino Alexis Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut Ercilla Gemma Institut de Ciències del Mar (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut Geo-Marine Letters Springer-Verlag 27/2-4(2007-06-01), 279-288 0276-0460 27:2-4<279 2007 27 367 https://doi.org/10.1007/s00367-007-0077-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00367-007-0077-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Piñero Elena Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut NATIONALLICENCE 700 1- Gràcia Eulàlia Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut NATIONALLICENCE 700 1- Martínez-Ruiz Francisca Instituto Andaluz de Ciencias de la Tierra (CSIC/Universidad de Granada) Facultad de Ciencias, Campus Fuentenueva, 18002, Granada, Spain aut NATIONALLICENCE 700 1- Larrasoaña Juan Laboratori de Paleomagnetisme, Institut de Ciències de la Terra "Jaume Almera” (CSIC)/Universitat de Barcelona, c/ Lluís Solé i Sabarís s/n, 08028, Barcelona, Spain aut NATIONALLICENCE 700 1- Vizcaino Alexis Unitat de Tecnologia Marina (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut NATIONALLICENCE 700 1- Ercilla Gemma Institut de Ciències del Mar (CSIC), Centre Mediterrani d'Investigacions Marines i Ambientals, Pg. Marítim de la Barceloneta 37-49, 08003, Barcelona, Spain aut NATIONALLICENCE 773 0- Geo-Marine Letters Springer-Verlag 27/2-4(2007-06-01), 279-288 0276-0460 27:2-4<279 2007 27 367 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer