Matches in SemOpenAlex for { <https://semopenalex.org/work/W3090338145> ?p ?o ?g. }
Showing items 1 to 54 of
54
with 100 items per page.
- W3090338145 abstract "<p>Ferruginous tubular structures concretions are widely distributed over the seafloor surrounding the <em>Gran Burato</em> depression in the Transitional Zone (TZ) province of the Galician Continental Margin (NW Iberian Margin). These bioforms-like structures are created by iron oxides precipitations into the tube-dwelling macrozoobenthos as a result of Fe<sup>2+</sup> upward diffusion and O<sub>2</sub> ventilation and diffusion acting in the water-sediment interphase in a non-steady state early diagenesis. X-ray diffraction analyses display that goethite is the main mineralogical component of these bioforms-like structures. Furthermore, non-steady state diagenesis has been identified by several oxidations fronts recognised in three piston cores, reflecting that the redoxcline has not achieved the deeper equilibrium in the study area. Afterwards, these ferruginous tubes were eroded, remobilised and redistributed over the seabed by bottom currents. Ocean-floor observations show erosion and sea-bottom current structures as ripples, grooves, erratic blocks, accumulations of pteropods and carbonate crusts associated with hardgrounds. Sedimentation rates calculated in a piston core display very low values for the last 30 cal ka BP (mean of 1.57 cm ky<sup>&#8722;1</sup>) with a marked hiatus between 17.80 to 10.45 cal ka BP, meanwhile abraded surfaces have been identified by high-resolution seismic data confirming erosional processes in this area of the TZ province. We conclude that the ferruginous bioforms accumulation over the deep-ocean floor is indicative of a present-day vigorous seafloor current acting and eroding the sediments of the TZ province. This bottom current is a direct consequence of the general seafloor elevation of the TZ province that causes constriction of the water masses (MOW and LSW) that induces a general intensification of the bottom currents and greater erosional capacity. This erosional process causes the continuous oxygenation of the upper sediments, and it prevents to reach the steady-state diagenesis, playing this fact an essential role in the ferruginous formations and accumulations in the study area.<br><br></p>" @default.
- W3090338145 created "2020-10-08" @default.
- W3090338145 creator A5026205674 @default.
- W3090338145 creator A5043579269 @default.
- W3090338145 creator A5050871462 @default.
- W3090338145 creator A5090128667 @default.
- W3090338145 date "2020-03-23" @default.
- W3090338145 modified "2023-09-27" @default.
- W3090338145 title "Ferruginous bioforms accumulations in deep marine environments: an approach to their origin and formation mechanisms in the Transitional Zone province of the Galician Continental Margin (NW Iberian Peninsula)" @default.
- W3090338145 doi "https://doi.org/10.5194/egusphere-egu2020-4165" @default.
- W3090338145 hasPublicationYear "2020" @default.
- W3090338145 type Work @default.
- W3090338145 sameAs 3090338145 @default.
- W3090338145 citedByCount "0" @default.
- W3090338145 crossrefType "posted-content" @default.
- W3090338145 hasAuthorship W3090338145A5026205674 @default.
- W3090338145 hasAuthorship W3090338145A5043579269 @default.
- W3090338145 hasAuthorship W3090338145A5050871462 @default.
- W3090338145 hasAuthorship W3090338145A5090128667 @default.
- W3090338145 hasConcept C117485682 @default.
- W3090338145 hasConcept C127313418 @default.
- W3090338145 hasConcept C127413603 @default.
- W3090338145 hasConcept C130452526 @default.
- W3090338145 hasConcept C151730666 @default.
- W3090338145 hasConcept C201867031 @default.
- W3090338145 hasConcept C25197100 @default.
- W3090338145 hasConcept C77928131 @default.
- W3090338145 hasConcept C78519656 @default.
- W3090338145 hasConceptScore W3090338145C117485682 @default.
- W3090338145 hasConceptScore W3090338145C127313418 @default.
- W3090338145 hasConceptScore W3090338145C127413603 @default.
- W3090338145 hasConceptScore W3090338145C130452526 @default.
- W3090338145 hasConceptScore W3090338145C151730666 @default.
- W3090338145 hasConceptScore W3090338145C201867031 @default.
- W3090338145 hasConceptScore W3090338145C25197100 @default.
- W3090338145 hasConceptScore W3090338145C77928131 @default.
- W3090338145 hasConceptScore W3090338145C78519656 @default.
- W3090338145 hasLocation W30903381451 @default.
- W3090338145 hasOpenAccess W3090338145 @default.
- W3090338145 hasPrimaryLocation W30903381451 @default.
- W3090338145 hasRelatedWork W19728594 @default.
- W3090338145 hasRelatedWork W19839487 @default.
- W3090338145 hasRelatedWork W41020816 @default.
- W3090338145 hasRelatedWork W43905089 @default.
- W3090338145 hasRelatedWork W44738658 @default.
- W3090338145 hasRelatedWork W44979996 @default.
- W3090338145 hasRelatedWork W47369899 @default.
- W3090338145 hasRelatedWork W54307532 @default.
- W3090338145 hasRelatedWork W8750932 @default.
- W3090338145 hasRelatedWork W95213175 @default.
- W3090338145 isParatext "false" @default.
- W3090338145 isRetracted "false" @default.
- W3090338145 magId "3090338145" @default.
- W3090338145 workType "article" @default.