Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/6033
DC Field | Value | Language |
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dc.contributor.authorall | Acton, G.; Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.authorall | Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Jovane, L.; Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.authorall | Lum, B.; Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.authorall | Ohneiser, C.; Department of Geology, University of Otago, PO Box 56, Dunedin - New Zealand | en |
dc.contributor.authorall | Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.authorall | Strada, E.; Dipartimento di Scienze della Terra, Università di Siena, Via del Laterino 8, I-53100 Siena – Italy | en |
dc.contributor.authorall | Verosub, K.L.; Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.authorall | Wilson, G.S.; Department of Geology, University of Otago, PO Box 56, Dunedin - New Zealand | en |
dc.contributor.authorall | THE ANDRIL-SMS Science Team; http://www.andrill.org/projects/sms/team.html | en |
dc.date.accessioned | 2010-06-08T12:03:53Z | en |
dc.date.available | 2010-06-08T12:03:53Z | en |
dc.date.issued | 2009 | en |
dc.identifier.uri | http://hdl.handle.net/2122/6033 | en |
dc.description.abstract | We conducted initial palaeomagnetic studies on cores from site AND-2A (77°45.488’S, 165°16.605’E, ~383.57 metres water depth). A total of 813 samples were collected that span from the top of the section down to the base at 1138.54 metres below sea floor (mbsf). Samples were collected every one or two metres down the core, with paired (pilot) samples being collected about every ten to twenty metres to allow us to assess the demagnetisation behaviour of the samples using either alternating field (AF) or thermal demagnetisation. With the exception of only a few intervals, AF demagnetisation was observed to resolve a characteristic remanent magnetisation (ChRM) as well or better than thermal demagnetisation. Thermal demagnetisation was particularly ineffective in many intervals owing to thermal alteration that was common above 500°C and was evident in some samples even at low temperatures. Above Lithostratigraphic Unit (LSU) 8 (436.18 mbsf), where lithologies are generally more coarse grained than lower in the section, resolving a ChRM is difficult and recent overprints or a drilling overprint are a concern. Within LSU 8 and below, most samples have a ChRM that can be resolved. The ChRM is most likely an original depositional magnetisation throughout most of this lower section, although orthogonal demagnetisation diagrams contain evidence that normal polarity overprinting affects some intervals. Based on 40Ar/39Ar dates and diatom datums, the magnetozones identified from the base of the hole up to ~266mbsf are consistent with spanning from either Chron C6n (18.748-19.772 Ma) or C6An.1n (20.040-20.213 Ma) up through Chron C5Br (15.160-15.974 Ma). Above this, intervals of constant polarity are isolated within longer stratigraphic intervals of uncertain polarity, making their correlation with the geomagnetic polarity timescale (GPTS) speculative and highly dependent on ages obtained from other dating methods. One exception is a reversed-to-normal polarity transition that occurs at ~31 mbsf and is interpreted to most likely be the Brunhes/Matuyama boundary. The spacing of polarity reversals below 266 mbsf and their correlation with the GPTS indicates that this part of the stratigraphic section was deposited between 15 to 20 Ma at a mean sedimentation rate of about 18 centimetres (cm)/ thousand year (k.y.). | en |
dc.language.iso | English | en |
dc.publisher.name | Terra Antartica | en |
dc.relation.ispartof | Terra Antartica | en |
dc.relation.ispartofseries | /15 (2009) | en |
dc.subject | Magnetostratigraphy | en |
dc.subject | ANDRILL | en |
dc.subject | Antarctica | en |
dc.subject | Paleomagnetism | en |
dc.title | Palaeomagnetism of the AND-2A Core, ANDRILL Southern McMurdo Sound Project, Antarctica | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 193-210 | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy | en |
dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism | en |
dc.relation.references | Acton, G., Crampton, J., Di Vincenzo, G., Fielding, C.R., Florindo, F., Hannah, M., Harwood, D., Ishman, S., Johnson, K., Jovane, L., Levy, R., Lum, B., Marcano, C., Mukasa, S., Ohneiser, C., Olney, M., Riesselman, C., Sagnotti, L., Stefano, C., Strada, E., Taviani, M., Tuzzi, E., Verosub, K.L., Wilson, G.S., Zattin, M., and The ANDRILL-SMS Science Team, 2008-2009. Preliminary integrated chronostratigraphy of the AND-2A Core, ANDRILL Southern McMurdo Sound Project, Antarctica, Terra Antartica, 15, this volume, 211-220. Cande S.C. & Kent D.V., 1995. Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic. J. Geophys. Res., 100, 6093-6095. Fielding C.R., Atkins C.B., Bassett K.N., Browne G.H., Dunbar G.B., Field B.D., Frank T.D., Krissek L.A., Panter K.S., Passchier S., Pekar S.F., Sandroni S., Talarico F., & the ANDRILL-SMS Science Team, 2008. Sedimentology and Stratigraphy of the AND-2A Core. ANDRILL Southern McMurdo Sound Project, Antarctica. Terra Antartica, 15, this volume, 77-112. Fisher R.A., 1953. Dispersion on a sphere. Proc. R. Soc. London A, 217, 295-305. Gradstein F.M., Ogg J.G., & Smith A.G, 2004. A Geologic Time Scale 2004. Cambridge University Press, Cambridge, United Kingdom, 610 pp. Kirschvink J.L., 1980. The least-squares line and plane and the analysis of palaeomagnetic data. Geophys. J. R. Astron. Soc., 62, 699-718. Kretz R., 1983. Symbols for rock forming minerals. American Mineralogist, 68, 277-279. Panter K.S., Talarico F., Bassett K., Del Carlo P., Field B., Frank T., Hoffman S., Kuhn G., Reichelt L., Sandroni S., Taviani M., Bracciali L., Cornamusini G., von Eynatten, H., Rocchi S., & the ANDRILL-SMS Science Team, 2008-2009. Petrologic and geochemical composition of the AND-2A Core, ANDRILL, Southern McMurdo Sound Project, Antarctica. Terra Antartica, 15, this volume, 147-192. Turner G.M., 2001. Toward an understanding of the mulicomponent magnetization of uplifted Neogene marine sediments in New Zealand, J. Geophys. Res., 106, 6385-6397. Wessel P., & Smith W.H.F., 1998. New, improved version of the Generic Mapping Tools released. Eos Trans. AGU, 79, 579. Wilson G.S., Florindo F., Sagnotti L., Ohneiser C., & the ANDRILLMIS Science Team, 2007. Palaeomagnetism of the AND-1B Core, ANDRILL McMurdo Ice Shelf Project, Antarctica. Terra Antartica, 14, 289-296. Worm H.-U., 1998. On the superparamagnetic-stable single domain transition for magnetite, and frequency dependence of susceptibility. Geophys. J. Int., 133, 201-206. | en |
dc.description.obiettivoSpecifico | 2.2. Laboratorio di paleomagnetismo | en |
dc.description.journalType | N/A or not JCR | en |
dc.description.fulltext | reserved | en |
dc.contributor.author | Acton, G. | en |
dc.contributor.author | Florindo, F. | en |
dc.contributor.author | Jovane, L. | en |
dc.contributor.author | Lum, B. | en |
dc.contributor.author | Ohneiser, C. | en |
dc.contributor.author | Sagnotti, L. | en |
dc.contributor.author | Strada, E. | en |
dc.contributor.author | Verosub, K.L. | en |
dc.contributor.author | Wilson, G.S. | en |
dc.contributor.author | THE ANDRIL-SMS Science Team | en |
dc.contributor.department | Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.department | Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.department | Department of Geology, University of Otago, PO Box 56, Dunedin - New Zealand | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.contributor.department | Dipartimento di Scienze della Terra, Università di Siena, Via del Laterino 8, I-53100 Siena – Italy | en |
dc.contributor.department | Geology Department, University of California – Davis, One Shields Ave., Davis, California, 95616 – USA | en |
dc.contributor.department | Department of Geology, University of Otago, PO Box 56, Dunedin - New Zealand | en |
dc.contributor.department | http://www.andrill.org/projects/sms/team.html | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | University of California, Davis | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | Geology Department, University of California – Davis, One Shields Ave., Davis, CA, 95616 - USA | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia | - |
crisitem.author.dept | University of California, Davis, | - |
crisitem.author.dept | Department of Geology, University of Otago, PO Box 56, Dunedin - New Zealand | - |
crisitem.author.dept | 0 | - |
crisitem.author.orcid | 0000-0002-3285-4022 | - |
crisitem.author.orcid | 0000-0002-6058-9748 | - |
crisitem.author.orcid | 0000-0002-2781-2522 | - |
crisitem.author.orcid | 0000-0003-3944-201X | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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