New late Proterozoic paleomagnetic pole for the Rio de la Plata craton: Implications for Gondwana
Major uncertainties remain on the precise kinematic and temporal aspects of Gondwana assembly. In order to provide new constraints on them, a paleomagnetic study was carried out on the Ediacaran succession of red claystones exposed in Sierra de los Barrientos (37.8°S, 59.0°W), Buenos Aires province,...
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2006
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| LEADER | 13873caa a22010457a 4500 | ||
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| 001 | PAPER-7094 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203650.0 | ||
| 008 | 190411s2006 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-33744903649 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a PCBRB | ||
| 100 | 1 | |a Rapalini, A.E. | |
| 245 | 1 | 0 | |a New late Proterozoic paleomagnetic pole for the Rio de la Plata craton: Implications for Gondwana |
| 260 | |c 2006 | ||
| 270 | 1 | 0 | |m Rapalini, A.E.; Instituto de Geofísica Daniel Valencio (INGEODAV), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina; email: rapalini@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 504 | |a Poiré, D.G., Spaletti, L.A., del Valle, A., The Cambrian-Ordovician siliciclastic sequence from the Tandilia System, Argentina (2001) Cambrian from the Southern Edge, 6, pp. 55-64. , Aceñolaza G., and Peralta S. (Eds), Instituto Superior de Correlación Geológica, Miscelánea, S.M. Tucumán, Argentina | ||
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| 520 | 3 | |a Major uncertainties remain on the precise kinematic and temporal aspects of Gondwana assembly. In order to provide new constraints on them, a paleomagnetic study was carried out on the Ediacaran succession of red claystones exposed in Sierra de los Barrientos (37.8°S, 59.0°W), Buenos Aires province, Argentina. This succesion belongs to the late Proterozoic-early Paleozoic sedimentary cover of the Rio de la Plata craton. Sixty-two oriented samples from 13 sites were submitted to standard stepwise demagnetization procedures yielding a characteristic remanence carried by hematite. A primary origin for the remanence is suggested by the apparent recording of secular variation along the stratigraphic column including a reversal of the earth magnetic field and an improvement in clustering of mean site directions after application of bedding corrections, although the latter is not statistically significant. Since the study samples show a significant anisotropy of magnetic susceptibility (AMS) degree (P up to 1.2) and an ellipsoid shape compatible with significant compaction during diagenesis, remanence inclination shallowing was investigated through oriented isothermal remanent magnetization (IRM) acquisition and demagnetization experiments. These permitted to confirm significant inclination shallowing and to compute a correction factor that was applied to the mean site directions producing a significantly further improvement in the statistical parameters. A paleomagnetic pole was computed for the Los Barrientos claystones at 15.1°S, 252.6°E, dp: 10.9°, dm: 14.2°. When rotated into a Gondwana framework, this new pole agrees with previous poles of ca. 550 Ma from several Gondwanan cratons, allowing the construction of a single APWP for the whole of Gondwana since that time, and suggesting that by ca. 550 Ma Gondwana was already assembled or in the final stages of that process. © 2006 Elsevier B.V. All rights reserved. |l eng | |
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires | ||
| 536 | |a Detalles de la financiación: Secretaría de Ciencia y Técnica, Universidad de Buenos Aires, X262, X045 | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas, PIP 2537 | ||
| 536 | |a Detalles de la financiación: This study was supported by the University of Buenos Aires (UBACyT grants X045 and X262) and CONICET (PIP 2537). First sampling of the succession was done during a field trip proposed by Carlos Rapela to sample the diabase sill exposed at Sierra de los Barrientos for paleomagnetic studies. V. García and D. Slaiman collaborated during the field trips. S. Alonso performed the X-ray analyses. M. Ernesto, R. Trindade and J. Urrutia kindly gave unrestricted access to equipment at the laboratories of Sao Paulo and Mexico, D.F. Careful reviews by J.M. Parés and R. Trindade, plus comments by editor Phil McCausland significantly improved the final version. | ||
| 593 | |a Instituto de Geofísica Daniel Valencio (INGEODAV), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Pabellon 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a GONDWANA |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PRECAMBRIAN |
| 690 | 1 | 0 | |a RIO DE LA PLATA CRATON |
| 690 | 1 | 0 | |a COMPACTION |
| 690 | 1 | 0 | |a CRATON |
| 690 | 1 | 0 | |a EDIACARAN |
| 690 | 1 | 0 | |a GONDWANA |
| 690 | 1 | 0 | |a MAGNETIC ANISOTROPY |
| 690 | 1 | 0 | |a MAGNETIC SURVEY |
| 690 | 1 | 0 | |a PALEOMAGNETISM |
| 690 | 1 | 0 | |a PROTEROZOIC |
| 690 | 1 | 0 | |a REMANENT MAGNETIZATION |
| 690 | 1 | 0 | |a RIO DE LA PLATA |
| 690 | 1 | 0 | |a SIERRA DE LOS BARRIENTOS |
| 651 | 4 | |a SOUTH AMERICA | |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a BUENOS AIRES [ARGENTINA] | |
| 651 | 4 | |a SOUTH AMERICA | |
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