georefid:2013-043238SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1144/SP373.192013-01-01publicationgeorefid:2013-043238doi:10.1144/SP373.19Herrero-Bervera, EmilioUniversity of Hawaii, Hawaii Institute of Geophysics and Planetology, Honolulu, United StatesauthorJovane, LuigiWestern Washington University, United StatesauthorGeological Society of London, London, United KingdompublisherdocumentHardcopySpecial Publication - Geological Society of London373We have studied the rock magnetic and palaeomagnetic properties of a 41 m long core (Hole M0058A) recovering calcareous sediments located seaward of Noggin Reef, offshore Queensland, Australia to decipher the magnetostratigrapy of the site. We deployed 1 cm (super 3) samples at every 10 cm down-core and subsampled the core by means of U-channels in order to obtain a continuous record. Stepwise alternating field demagnetization from natural remanent magnetization to 80 mT showed that the characteristic remanent magnetization was isolated at low demagnetization fields between 0 and 15 mT. We conducted magnetic granulometry analyses and Curie point determinations. The low-field v. temperature analyses indicate the presence of Ti-poor magnetite with Curie points from 560 to 563 degrees C. Hysteresis loop experiments were performed. The results show M (sub rs) /M (sub s) and H (sub cr) /H (sub c) ratios corresponding to single domain to multi-domain and super-paramagnetic to single domain ranges. Both discrete and continuous inclination results indicate a remarkable correlation of three excursional inclinations occurring during intervals of low intensity of magnetization closely corresponding to the Laschamp (c. 41 ka), Skalamaelifell (c. 94 ka) and Blake (c. 115-120 ka) "aborted reversals," and indicate that the base of the core is much older than the Blake excursion.completedSolid-earth geophysicsGeochronologyageAustralasiaAustraliaCenozoicCoral SeaCurie pointdemagnetizationExpedition 325Great Barrier ReefGreat Barrier Reef Environmental ChangesIntegrated Ocean Drilling ProgramIODP Site M0058last glacial maximummagnetic excursionsmagnetizationmagnetostratigraphyNoggin ReefPacific Oceanpaleomagnetismphysicochemical propertiesPleistoceneQuaternaryQueensland Australiaremanent magnetizationSouth PacificSouthwest PacificWest Pacificurn:org.iodp:exp:325urnlargerWorkCitationcampaignurn:org.iodp:exp:325:site:M0058urnlargerWorkCitationstudyurn:org.iodp:exp:325urnlargerWorkCitationcampaignEnglishgeoscientificInformation146.3521146.3521-17.0550-17.0550