The northwestern Australian continental margin can be considered as a passive continental margin of the rifted atlantic type (Whitworth 1969; Powell 1973, 1976; Falvey 1974; Veevers 1974; Willcox 1974, 1976; Exon et al. 1975) which are usually associated with heavy accumulation of sediments (Beck et al. 1974) and are therefore of interest for hydrocarbon exploration in the longer term. The Federal Institute for Geosciences and Natural Resources (BGR, Hannover, Germany) has conducted geoscientific surveys at various continental margins of the Atlantic Ocean in the past years (Seibold 1972; Hinz et al. 1973; Seibold, Hinz 1974/1976; Seibold et al. 1975; Roeser et al. 1971) and the marine research programme of the Bureau of Mineral Resources, Geology & Geophysics (BMR, Canberra, Australia) is putting the focal point as well on the survey of the continental margins. Hence in the frame of the Australian-German contract of scientific and technical cooperation, BGR has proposed joint geoscientific surveys of the continental margins with the German research vessel VALDIVIA. The Scott-Plateau (NW-Australia) has been chosen as investigation area because BMR has carried out geophysical overview measurements previously in that region. The survey has been planned with the main focus on the geological processes at the early rift stadium and the set of problems about the "transition of oceanic to continental crust". The following regional geological units are known: the archaic-proterozoic Kimberley shield is followed by the Browse Basin - a NE striking epicontinental basin filled with mesozoic and tertiary sediments showing a thickness of up to 10 km (Powell 1976). It is presumed that the Browse Basin is delimitated by the Scott Plateau. Presumably, the Scott Plateau consists of continental crust which thins out to the north in direction to the Argo Abyssal Plain. The development of the Browse Basin is ascribed to a series of rift processes in the late paleozoic and triassic age where gas condensates have been detected at the drill hole Scott Reef 1. The contemporary configuration of the NW-Australian basins and the NW-Australian continental margin has been formed by an important middle jurassic rift phase and a subsequent drift phase. The cruises VA16-2A from 6th to the 25th of February 1977 with geophysical measurements and VA16-2B from 25th of February to 9th of March 1977 with geological sample recovery should clarify these processes. The working area of cruise VA16-2C from 11th to 23rd of March 1977 has been the Timor Trough and the Savu Sea which separate the islands Timor, Roti, Savu and Sumba from the volcanic islands of the inner Banda island arc. The crustal structure of Sumba, of the Savu Sea and of the inner Banda island arc near Flores should be investigated with seismic methods (small explosive charges fired from the research vessel VALDIVIA in the Savu Sea and intended recording units of the Flinders University on the islands Savu, Sumba and Flores) as well as with sonobuoy stations of BGR. Newer investigations (Audley Charles 1975, Chamalaun 1974) suggest that the islands of the Banda island arc (Sumba, Savu, Roti, Timor etc.) represent the northern border of the Australian continent being underlain by the crust of the Australian continent as opposed to the assumption of other investigators (e.g. Beck and Lehner 1974) who presume the northern border of the Australian continent at the Timor Trough south of the Timor island and postulate a subduction zone between the outer Banda island arc and Australia. BMR has provided 9 tons of explosives (Nitramon) with accessories for refraction seismics. The Flinders University has prepared 7 on-shore recording units and sent to Indonesia together with operating staff. BGR conducted the marine seismic work with explosive charges and off-shore recordings with sonobuoys for refraction seismic as well as reflection seismic, gravimetric and magnetic measurements.
Das Forschungsschiff Polarstern des Alfred-Wegener-Instituts für Polar- und Meeresforschung hat die erste Antarktissaison im Internationalen Polarjahr erfolgreich abgeschlossen. 58 Wissenschaftlerinnen und Wissenschaftler aus zehn Ländern waren vom 6. Februar bis 16. April 2008 an Bord des Forschungsschiffs im Südlichen Ozean unterwegs. Das erste Ergebnis dieser Expedition: Die Tiefsee der Antarktis wird nach jahrelanger Erwärmung wieder kälter. Dadurch könnten die Umwälzbewegungen der ozeanischen Wassermassen in Schwung gebracht werden. Gleichzeitig haben Satellitenaufnahmen die höchste Ausdehnung von Meereis im antarktischen Sommer seit Beginn der Aufzeichnungen gezeigt. Ob der kalte antarktische Sommer einen neuen Trend einleitet oder nur ein Ausrutscher war, wird mittels autonomer Messbojen in den nächsten Jahren weiter untersucht.
Der Datensatz enthält die Forschungsschiffe der hydrografische Messungen mehrerer wissenschaftlicher Kreuzfahrten des Thuenen-Instituts für Seefischerei.
Im Rahmen des PANORAMA Projekts wurden vier marin-geophysikalische und marin geologische Expeditionen durchgeführt. 2013: Panorama1 mit dem Forschungsschiff RV OGS Explora, nördliche Barentssee und Eurasisches Becken; 2015: Panorama2 mit RV OGS Explora, nördliche Barentssee, Olga Becken; 2017 SEGMENT mit RV Maria S. Merian, nordöstlicher Kontinentrand Grönland; 2018 GREENMATE mit RV Polarstern, nordöstlicher und nördlicher Kontinentrand Grönland. Die geowissenschaftlichen Daten umfassen für die genannten Expeditionen 2D reflexionsseismische Daten und refraktionsseismische Daten (mit OBS bzw. Sonarboje. Zusätzlich wurden hydroakustische Daten mit den bordeigenen Fächerecholoten bzw. Sedimentecholoten aufgezeichnet. Darüber hinaus wurden gravimetrische und magnetische Daten erfasst. Geologische und geochemische Daten wurden mit Schwereloten und Multicorern genommen. Im Rahmen der Expedition Greenmate (2018) wurde auch per Helikopter Proben an der Küste NO Grönlands genommen. Ergebnisse stehen bislang in den folgenden Veröffentlichungen zur Verfügung: Berglar Kai, Franke Dieter, Lutz Rüdiger, Schreckenberger Bernd, Damm Volkmar; Initial Opening of the Eurasian Basin, Arctic Ocean; Frontiers in Earth Science; 2016; DOI=10.3389/feart.2016.00091 Rüdiger Lutz, Dieter Franke, Kai Berglar, Ingo Heyde, Bernd Schreckenberger, Peter Klitzke, Wolfram H. Geissler; Evidence for mantle exhumation since the early evolution of the slow-spreading Gakkel Ridge, Arctic Ocean; Journal of Geodynamics; 2018; https://doi.org/10.1016/j.jog.2018.01.014 Philipp Weniger, Martin Blumenberg, Kai Berglar, Axel Ehrhardt, Peter Klitzke, Martin Krüger, Rüdiger Lutz; Origin of near-surface hydrocarbon gases bound in northern Barents Sea sediments; Marine and Petroleum Geology; 2019 https://doi.org/10.1016/j.marpetgeo.2018.12.036 P. Klitzke, D. Franke, A. Ehrhardt, R. Lutz, L. Reinhardt, I. Heyde, J.I. Faleide; The paleozoic evolution of the Olga Basin region, northern Barents Sea – a link to the timanian orogeny; G-cubed, 20 (2) (2019); 10.1029/2018GC007814 Rüdiger Lutz, Peter Klitzke, Philipp Weniger, Martin Blumenberg, Dieter Franke, Lutz Reinhardt, Axel Ehrhardt, Kai Berglar; Basin and petroleum systems modelling in the northern Norwegian Barents Sea; Marine and Petroleum Geology; 2021; https://doi.org/10.1016/j.marpetgeo.2021.105128. Franke, D., Klitzke, P., Barckhausen, U., Berglar, K., Berndt, C., Damm, V., Dannowski, A., Ehrhardt, A., Engels, M., Funck, T., Geissler, W., Schnabel, M., Thorwart, M. & Trinhammer, P. (2019): Polyphase Magmatism During the Formation of the Northern East Greenland Continental Margin. - Tectonics, 38, 8: 2961–2982, DOI: 10.1029/2019tc005552.
A geophysical reconnaissance survey was carried out in the Labrador Sea and Davis Strait between July and September 1977 by BGR. The data format is Society of Exploration Geophysicists SEG Y. The survey was executed on the research vessel MS Explora. The seismic, magnetic and gravity data from 5931 line-kilometers on 21 lines were recorded on magnetic tape. A 24-fold coverage technique was used with 48 seismic channels (traces), with a 2400m streamer cable, and 23.45 l airgun array. A full integrated computerized satellite navigation system (INDAS III) served as positioning system. Based on a preliminary interpretation of the seismograms, the Labrador Sea was devided into an eastern (Greenland) and western (Canadian) area, seperated by the Mid Labrador Ridge. Within the eastern part of the Labrador Sea the Pre-Cenozoic sediments show three distinct layers, traceable over the entire Greenland area of the sea. In the Cenozoic layer olisthostromes occur. The highest apparent velocity determined from sonobuoy data was 9.26 km/sec. The calculated refractor lies at a depth of approximately 13 km. The seismic section from the sediments on the Canadian side of the Labrador Sea show a uniform series of thick sediments below the Cenozoic cover. The highly disturbed basement is often masked by the multiple reflections from the seafloor. Statements about the nature and structure of the basement can only be made after processing data.
In the framework of the IDOE-SEATAR (International Decade of Ocean Exploration - Studies of East Asia Tectonics and Resources) Program, the Federal Institute for Geosciences and Natural Resources carried out a geophysical survey in the Sulu Sea during the period from March 11, 1982 to April 15, 1982 using the German research vessel R/V SONNE. The SONNE cruise no. SO-23 continued SEATAR-related studies of BGR which have been carried out during the Southeast Asian Cruise of the VALDIVIA (VA-16) in 1977. During SONNE cruise no. SO-23, multi-channel reflection measurements were carried out in parallel with magnetic, gravimetric, and sea-beam measurements on 21 lines with a total length of 3,300 km in the Sulu Sea. In the NW Sulu Basin, situated between the shelf of East Palawan in the north and the volcanic Cagayan Ridge in the south, a 50 - 100 km wide graben-like basin exists which is filled with thick Neogene and pre-Middle Miocene sediments. The basin trends east-northeast. At longitude 119°E it bends to a north-south direction. The dominating structural element within the sedimentary graben-like basin is a diapiric-chaotic zone about 25 km wide, which was only detectable west of longitude 120°E. The base of the elongated diapiric-chaotic zone, which might represent a tectonically mobilized equivalent of the Crocker Formation (Middle Miocene - Lower Oligocene) is difficult to define in the seismic monitor records. The configuration and the internal structural style of individual structures of the diapiric-chaotic zone, which can be followed over length of about 150 km, seem to resemble those of the oil-bearing province offshore western Sabah. In the eastern part of the NW-Sulu Basin east of longitude 119°E, several north-trending anticlines of presumably Middle Miocene age and locally volcanic intrusions of presumably Plio-Pleistocene age have been observed. During the second leg of the cruise SO-23 in the southeastern part of the South China Sea (April 16, 1982, to May 9, 1982) multi-channel seismic reflection measurements were carried out in parallel with magnetic, gravimetric, and sea-beam measurements on 19 lines with a total length of 3,570 km in the southeastern part of the South China Sea, including the area of the Dangerous Grounds. In addition, 2,280 km of profile was surveyed with only magnetics, gravity, and sea-beam measurements. A complex structural style was observed in the investigated part of the Dangerous Grounds, South China Sea, which is believed to be part of a microcontinental block which rifted from the continental margin of Asia in the Early Paleogene/Late Mesozoic time. There are prospective depocenters and structures trending NE-SW, E-W, and N-S in the southwestern part, i.e. the area west of longitude 117.5°E (units 2, 3, 4). Unit 4 contains a series of half-grabens with thick sedimentary infill. An imbricated melange of pre-Middle Miocene age seems to exist only off southern Palawan. The dominating structural trend in the area northeast of Reed Bank is NW-SE. Oceanic crust characterized by NW-trending magnetic lineations (anomalies 8 to 12 ?) was observed north of latitude 12°N and between longitude 118°E and the Manila Trench.
From 1st May to 25th May 2011 the French Institute from Brest Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) together with BGR conducted a scientific cruise on the IFREMER research vessel L'ATALANTE, which constitutes the 1st leg of the MIRROR survey. In order to acquire supplementary marine geophysical research data to the MIRROR scientific survey a 2nd leg was performed from 2nd June to 11th June 2011. Both legs are spread over the shelf edge and slope of Morocco, the adjacent Essaouira Rise, and the easternmost abyssal plain, and are located between 33°30' N and 30°30' N. The region of MIRROR Leg 2 is situated south of Leg 1. The main research objectives were to image the deep structure of the crust, to test the origin of the magnetic anomaly S1, and to test rifting models in order to understand the nature of the continental margin of Morocco as well as the opening history of the Atlantic Ocean. Another objective was to realize a comprehensive sediment basin analysis for specifying the hydrocarbon potential of the region. In total multi-channel seismic lines with a length of 1,391 km and additional 271 km with the other geophysical methods (magnetic field measurements as well as bathymetry) were acquired. The seismic data acquired during Leg 2 were processed onboard and two of the lines were interpreted. Line BGR11-208 traverses from DSDP Site 415 to Site 416 and ties the MCS grids of both MIRROR legs as well as other former MSC surveys of BGR. Therefore, the line enables a reliable regional seismostratigraphic interpretation and a moderately well mapping of the Jurassic, Cretaceous, and Cenozoic sequences. Large compressional structures are present in the sedimentary cover along the seismic line pointing to transform faults or an activated fracture zone. Regarding the NWW-SEE trending line BGR11-202 the area of investigation can be subdivided into three structural units, a zone of rifted continental margin, a zone of initial seafloor spreading, and a zone of regular seafloor spreading as well as post-Cretaceous igneous activity. Huge rotated basement blocks are located under the shelf and uppermost slope and striking salt domes at the lowermost slope. The zone of initial seafloor spreading is characterized by a sub-basement reflector with overlying tilted basement blocks. The sub-basement reflector trends generally horizontal and appears to be a detachment fault. The magnetic slope anomaly S1 is located at foot of the slope near the western boundary of the zone of rifted continental margin.
Processed seismic data from Baltic Sea with research ship M/V Polar Queen.The data format is Society of Exploration Geophysicists SEG Y. During the period from 14th to 28th of April 1996 BGR and GFZ chartered the Norwegian vessel M/V POLAR QUEEN for testing the new and updated marine seismic equipment of the BGR and for acquiring seismic lines. The operating area was the North Sea and Baltic Sea. The geophysical lines in the Baltic Sea were chosen as extended onshore DEKORP lines to evaluate the deep structure of the south western part of the Baltic Sea. For the seismic profiles a tuned source array consisting of 20 air guns in two linear strings with a total volume of 52 l was used. The recording length was 26 s, the sample rate 4 ms and the shot interval 30 s. This time triggering for the shot release was chosen, because all shots were also recorded onshore by seismic stations for wide angle/refraction acquisition (GFZ). During this leg 810 km reflection lines and additional 230 km pure shooting could be surveyed. The preliminary interpretation of the seismic single traces was restricted on the ship to the upper time range. The main structures in the southern Baltic Sea could be evaluated. A full interpretation especially of the deeper part is only possible after a processing due to the nature of the single traces and the S/N ratio.
Continuing the systematic work which was started during a previous BGR expedition with RV AURELIA in Sept./Oct. 2003 the late Tertiary and Quaternary development of the German EEZ was further investigated by seismic profiling. The data format is Society of Exploration Geophysicists SEG Y. Again the research vessel AURELIA was chartered for a period of 21 days from 31st of May to 19th of June 2004. During the cruise the grid of seismic profiles which was aquired in 2003 was completed and data gaps were closed. A total of 2618km of high quality MCS lines were surveyed.
The previous BGR-cruises with RV AURELIA in 2003 and 2004 were designed to collect a grid of seismic MCS-data which should enable us to get a high-resolution overview over the upper 1 s TWT of the sediments of the German North Sea sector. The data format is Society of Exploration Geophysicists SEG Y. Together with the previously acquired data these new data should help to extend our knowledge of the Late Tertiary and Quaternary evolution of the German North Sea Sector. For the current measurements under the scope of the DFG-funded project RE2424/1-1 ‚Nordsee’ the research vessel RV HEINCKE was made available by the ‘Senatskommission für Ozeanographie’ of the DFG. During the cruise a total ca. 1400 km of high quality MCS lines were surveyed and simultaneously measured by a sediment echosounder system that enabled additional profiles during transits with speeds > 5 kn. The BGR high-resolution multichannel seismic reflection system consisting of a GI-Gun (0.8 l) and a 300 m streamer with 24 channels and a sediment echosounder type SES 2000 standard by Innomar, Rostock. While the BGR-seismic system was used to observe the shallow subsurface down to 2 s TWT penetration depth, the sediment echosounder with a penetration depth of several meters was primarily intended to identify sampling positions for the deployment of the BGR vibration corer during the succeeding Leg 2. Additionally, the echosounder system enables the relationship to the highest-resolution multichannel seismic measurements of the group of the University of Bremen on FK SENCKENBERG. All seismic records were processed onboard for the quality control and for a first interpretation.
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