espanolLas deformaciones de los sedimentos oligocenos relacionadas con las fases de extension en las cuencas de Marsella-Aubagne, se han puesto en evidencia desde 1990. Sin embargo, en varias ocasiones y por diferentes autores, ya se habian mencionado deformaciones en regimen de compresion en estas tierras, sin una conclusion real. Nuestras investigaciones para la actualizacion de la 3a edicion del mapa geologico de Marsella-Aubagne, nos permite conocer la estructura de las cuencas y mostrar que solo las formaciones Rupelienses habian sufrido deformaciones en regimen compresivo. Las formaciones mas jovenes (principalmente chattienses) poco deformadas, reposan en discordancia sobre las formaciones rupelienses. Por tanto, existe una gran discordancia tectonica entre los dos grupos de formaciones. Las deformaciones compresivas estan relacionadas con dos eventos distintos (TC-1 y TC-2) desde el punto de vista de su geometria, pero sub-contemporaneos. En efecto, los pliegues TC-2 deformaron los ejes de los pliegues TC-1 y son forzosamente posteriores a estos ultimos. Por lo tanto, las dataciones cronoestratigraficas y radiometricas muestran que estos eventos estan situados en una ventana temporal proxima al limite entre el Rupeliense/Chatiense (28.1 Ma). Una tercera fase tectonica (TC-3) ha producido pliegues en el Chatiense y Mioceno inferior pero su relacion con otro regimen compresivo no ha sido establecido. EnglishAn Oligocene tectonic event has been suspected as the origin of thrusts and folds in several Oligocene troughs and basins of Provence, including the Marseille-Aubagne basins. Deformations are generally assumed to be to a post Oligocene extensional event. The Marseille-Aubagne basins are geographically and stratigraphically separated into three basins (Jarret, Prado and Aubagne) with each of them exhibiting their own sedimentary succession. However, each of the successions includes two main units: - The lower unit which includes several formations attributed to the Rupelian age. All of these sediments are strongly or slightly deformed depending on their location with respect to the main faults. - The upper unit which includes formations of mainly Chattian age. They are undeformed or slightly deformed. Geological sections across the southern Prado basin show a succession of anticlines and synclines. Additionally the thrusting of the Carpiagne massif over the Prado basin has been evidenced since 1952. These deformations are here related to a compressional event According to palaeontological data, the latest deformed strata are ascribed to the Late Rupelian, whereas the earliest undeformed strata are ascribed to the Latest Rupelian. This is in accordance with age determinations on detrital zircons extracted from the latest deformed sandstone, and from the youngest age of detrital zircons from the undeformed sandstone. Thus, the stratigraphic limit between the deformed and undeformed formations should be set around the Rupelian / Chattian limit (28.1 Ma) according to the latest chronostratigraphic chart. Finally, we discuss correlations with similar events occurring around the Mediterranean area.
In eastern Indonesia, the Central Sulawesi fault system consists of complex left‐lateral strike‐slip fault zones located within the triple junction area between the Pacific, Indo‐Australian and Eurasian plates. Seismicity in Central Sulawesi documents low‐magnitude shallow earthquakes related, from NW to SE, to the NNW‐trending Palu‐Koro (PKF) and WNW‐trending Matano fault zones. Study of the active fault traces indicates a northward growing complexity in the PKF segmentation. Left‐lateral displacement of 370 ± 10 m of streams incised within fans, whose deposition has been dated at 11 000 ± 2300 years, yields a calculated PKF horizontal slip rate of 35 ± 8 mm yr −1 . This geologically determined long‐term slip rate agrees with the far‐field strike‐slip rate of 32–45 mm yr −1 previously proposed from GPS measurements and confirms that the PKF is a fast slipping fault with a relatively low level of seismicity.
Other| January 01, 1991 La Tectonique d'inversion medio-cretacee de la marge sud-guineenne (campagne EQUAMARGE II) P. Tricart; P. Tricart Author Univ. Maine, Le Mans, France Search for other works by this author on: GSW Google Scholar J. Mascle; J. Mascle Author Search for other works by this author on: GSW Google Scholar C. Basile; C. Basile Author Search for other works by this author on: GSW Google Scholar J. Benkhelil; J. Benkhelil Author Search for other works by this author on: GSW Google Scholar G. Ciais; G. Ciais Author Search for other works by this author on: GSW Google Scholar M. Villeneuve M. Villeneuve Author Search for other works by this author on: GSW Google Scholar Author and Article Information P. Tricart Author Univ. Maine, Le Mans, France J. Mascle Author C. Basile Author J. Benkhelil Author G. Ciais Author M. Villeneuve Author Publisher: Société Géologique de France First Online: 07 Mar 2017 Online Issn: 1777-5817 Print Issn: 0037-9409 GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France Bulletin de la Société Géologique de France (1991) 162 (1): 91–99. https://doi.org/10.2113/gssgfbull.162.1.91 Article history First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation P. Tricart, J. Mascle, C. Basile, J. Benkhelil, G. Ciais, M. Villeneuve; La Tectonique d'inversion medio-cretacee de la marge sud-guineenne (campagne EQUAMARGE II). Bulletin de la Société Géologique de France 1991;; 162 (1): 91–99. doi: https://doi.org/10.2113/gssgfbull.162.1.91 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin de la Société Géologique de France Search Advanced Search This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
The North Banda Sea Basin is located in Eastern Indonesia, close to the triple junction between the Eurasian, Pacific and Indo-Australian plates, and
opened during Late Miocene time in a back arc setting. We use the magnetic and bathymetric data to depict this opening and the geodynamical evolution of the basin. We also take into account radiochronological datations available from some dredges of its basement. Sea floor spreading occurred from 12.5 to 7.15 Ma directed by three large NW–SE transform faults, namely the West Buru, Tampomas and Hamilton fracture zones. Finally, a schematic model of the North and South Banda basins evolution is presented.
