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"Buntsandstein" magnetostratigraphy and biostratigraphic reappraisal from eastern Iberia: Early and Middle Triassic stage boundary definitions through correlation to Tethyan sections
Author(s)
Language
English
Obiettivo Specifico
2.2. Laboratorio di paleomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
1-2 / 229 (2005)
Publisher
Elsevier
Pages (printed)
158-177
Issued date
December 12, 2005
Abstract
A new magnetic polarity stratigraphy is reported from 214 sampling sites representing 265 m of fluviatile red beds of the
Buntsandstein facies succession from the Catalan Coastal Ranges (Riera de Sant Jaume, RSJ section). The Buntsandstein constitutes the lowermost of the six lithostratigraphic units in which the Triassic from the CCR is subdivided (also grouped into the typical three-fold subdivision of the Germanic Facies from the Tethys Realm: Buntsandstein, Muschelkalk and Keuper).
Magnetostratigraphic data from four sections though the uppermost Buntsandstein facies located in the Molina de Aragón area
in the Iberian Ranges (Rey, D., Turner, P., Ramos, A., 1996. Palaeomagnetism and Magnetostratigraphy of the Middle Triassic
in the Iberian Ranges (Central Spain). In: Morris, A., Tarling, D.R. (Eds.), Palaeomagnetism and Tectonics of the Mediterranean Region, Geol. Soc. Sp. Pub. 105, 59–82) are also discussed in the light of a new biostratigraphic reappraisal of the palynoflora content presented herein. Characteristic magnetizations are carried mostly by hematite with minor contributions by magnetite for the Buntsandstein red beds. The magnetic polarity sequence at the RSJ section consists of 9 magnetozones (and one
additional less reliable magnetozone) that are represented by more than two samples. A detailed study along a magnetic reversal
indicates that the nature of the remanence in the studied red beds is partially controlled by a chemical magnetization process (delayed remanence acquisition), in addition to a detrital signature (the characteristic primary direction). Chronostratigraphic
constraints are provided by conodont fauna from the overlying Muschelkalk facies that indicates a middle–late Pelsonian to late
Illyrian age (middle–late Anisian) (Marquez-Aliaga, A., Valenzuela-Rios, J.I., Calvet, F., Budurov, K., 2000. Middle Triassic conodonts from northeastern Spain; biostratigraphic implications. Terra Nova 12, 77–83) and a few palynostratigraphic
determinations in the Buntsandstein red beds. These biostratigraphic constraints and the magnetic polarity pattern allow an unambiguous correlation of the RSJ magnetostratigraphy to the conodont-ammonoid-calibrated magnetostratigraphy from the Tethys realm (Muttoni, G., Kent, D.V., Meco, S., Balini, M., Nicora, A., Rettori, R. Gaetani, M., Krystine, L., 1998. Towards a better definition of the Middle Triassic magnetostratigraphy and biostratigraphy of the Tethyan realm. Earth Planet. Sci. Lett. 164, 285–302; Muttoni, G., Gaetani, M., Budurov, K., Zagorchev, I., Trifonova, E., Ivanova, D., Petrounova, L., Lowrie, W.,
2000. Middle Triassic paleomagnetic data from northern Bulgaria; constraints on Tethyan magnetostratigraphy and paleogeography.
Palaeogeogr. Palaeoclimatol. Palaeoecol. 160, 223–237; Muttoni, G., Nicora, A., Brack, P., Kent, D.V., 2004a. Integrated Anisian–Ladinian boundary chronology. Palaeogeogr. Palaeoclimatol. Palaeoecol. 208, 85–102; Muttoni, G., Kent, D.V., Olsen, P.E., Di Stefano, P., Lowrie, W., Bernasconi, S., Hernandez, F.M., 2004b. Tethyan magnetostratigraphy from Pizzo Mondello (Sicily) and correlation to the Late Triassic Newark astrochronological polarity time scale. Geol. Soc. Amer. Bull. 116, 1043–1058). The proposed correlation identifies for the first time in the Triassic from Iberia the Olenekian (Scythian)–Anisian stage boundary (245 Ma) within magnetozone N3 in the Riera de Sant Jaume units. Likewise, the new palynostratigraphic reconsideration allows the identification of the Anisian–Ladian stage (Illyrian–Fassanian substage) boundary (taken the option at the base of the Curionii ammonoid Zone favored by Muttoni et al. (2004a) [Muttoni, G., Nicora, A., Brack, P., Kent, D.V., 2004. Integrated Anisian–Ladinian boundary chronology. Palaeogeogr. Palaeoclimatol. Palaeoecol. 208,
85–102] for this boundary within the upper part of the Rillo Mudstone and Sandstones Formation (RMS Formation) and the
Fassanian–Longobardian substage boundary (Ladinian) within the Torete Multicoloured Mudstone and Sandstone Formation
(TMMS Formation). Our data are consistent with the notion that the lower Muschelkalk transgression progressed from east to
west (i.e., the Buntsandstein/Muschelkalk boundary is younger in the Iberian Ranges with respect to the Catalan Coastal Ranges).
The Early/Middle Triassic paleopole for the Catalan Coastal Ranges is located at 55.18N 172.4E (Dp=1.4, Dm=2.7).and the Middle/Late Triassic paleopole for the Iberian Ranges is 558N 201E (Dp=1.7, Dm=3.1). These paleopoles are compatible with the general trend of the Iberian apparent polar wander path which indicates a northward motion during the Triassic related to the general northward translation of Pangea.
Buntsandstein facies succession from the Catalan Coastal Ranges (Riera de Sant Jaume, RSJ section). The Buntsandstein constitutes the lowermost of the six lithostratigraphic units in which the Triassic from the CCR is subdivided (also grouped into the typical three-fold subdivision of the Germanic Facies from the Tethys Realm: Buntsandstein, Muschelkalk and Keuper).
Magnetostratigraphic data from four sections though the uppermost Buntsandstein facies located in the Molina de Aragón area
in the Iberian Ranges (Rey, D., Turner, P., Ramos, A., 1996. Palaeomagnetism and Magnetostratigraphy of the Middle Triassic
in the Iberian Ranges (Central Spain). In: Morris, A., Tarling, D.R. (Eds.), Palaeomagnetism and Tectonics of the Mediterranean Region, Geol. Soc. Sp. Pub. 105, 59–82) are also discussed in the light of a new biostratigraphic reappraisal of the palynoflora content presented herein. Characteristic magnetizations are carried mostly by hematite with minor contributions by magnetite for the Buntsandstein red beds. The magnetic polarity sequence at the RSJ section consists of 9 magnetozones (and one
additional less reliable magnetozone) that are represented by more than two samples. A detailed study along a magnetic reversal
indicates that the nature of the remanence in the studied red beds is partially controlled by a chemical magnetization process (delayed remanence acquisition), in addition to a detrital signature (the characteristic primary direction). Chronostratigraphic
constraints are provided by conodont fauna from the overlying Muschelkalk facies that indicates a middle–late Pelsonian to late
Illyrian age (middle–late Anisian) (Marquez-Aliaga, A., Valenzuela-Rios, J.I., Calvet, F., Budurov, K., 2000. Middle Triassic conodonts from northeastern Spain; biostratigraphic implications. Terra Nova 12, 77–83) and a few palynostratigraphic
determinations in the Buntsandstein red beds. These biostratigraphic constraints and the magnetic polarity pattern allow an unambiguous correlation of the RSJ magnetostratigraphy to the conodont-ammonoid-calibrated magnetostratigraphy from the Tethys realm (Muttoni, G., Kent, D.V., Meco, S., Balini, M., Nicora, A., Rettori, R. Gaetani, M., Krystine, L., 1998. Towards a better definition of the Middle Triassic magnetostratigraphy and biostratigraphy of the Tethyan realm. Earth Planet. Sci. Lett. 164, 285–302; Muttoni, G., Gaetani, M., Budurov, K., Zagorchev, I., Trifonova, E., Ivanova, D., Petrounova, L., Lowrie, W.,
2000. Middle Triassic paleomagnetic data from northern Bulgaria; constraints on Tethyan magnetostratigraphy and paleogeography.
Palaeogeogr. Palaeoclimatol. Palaeoecol. 160, 223–237; Muttoni, G., Nicora, A., Brack, P., Kent, D.V., 2004a. Integrated Anisian–Ladinian boundary chronology. Palaeogeogr. Palaeoclimatol. Palaeoecol. 208, 85–102; Muttoni, G., Kent, D.V., Olsen, P.E., Di Stefano, P., Lowrie, W., Bernasconi, S., Hernandez, F.M., 2004b. Tethyan magnetostratigraphy from Pizzo Mondello (Sicily) and correlation to the Late Triassic Newark astrochronological polarity time scale. Geol. Soc. Amer. Bull. 116, 1043–1058). The proposed correlation identifies for the first time in the Triassic from Iberia the Olenekian (Scythian)–Anisian stage boundary (245 Ma) within magnetozone N3 in the Riera de Sant Jaume units. Likewise, the new palynostratigraphic reconsideration allows the identification of the Anisian–Ladian stage (Illyrian–Fassanian substage) boundary (taken the option at the base of the Curionii ammonoid Zone favored by Muttoni et al. (2004a) [Muttoni, G., Nicora, A., Brack, P., Kent, D.V., 2004. Integrated Anisian–Ladinian boundary chronology. Palaeogeogr. Palaeoclimatol. Palaeoecol. 208,
85–102] for this boundary within the upper part of the Rillo Mudstone and Sandstones Formation (RMS Formation) and the
Fassanian–Longobardian substage boundary (Ladinian) within the Torete Multicoloured Mudstone and Sandstone Formation
(TMMS Formation). Our data are consistent with the notion that the lower Muschelkalk transgression progressed from east to
west (i.e., the Buntsandstein/Muschelkalk boundary is younger in the Iberian Ranges with respect to the Catalan Coastal Ranges).
The Early/Middle Triassic paleopole for the Catalan Coastal Ranges is located at 55.18N 172.4E (Dp=1.4, Dm=2.7).and the Middle/Late Triassic paleopole for the Iberian Ranges is 558N 201E (Dp=1.7, Dm=3.1). These paleopoles are compatible with the general trend of the Iberian apparent polar wander path which indicates a northward motion during the Triassic related to the general northward translation of Pangea.
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vol. 15, pp. 53–69.
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Magnetostratigraphy of the Late Triassic Bolucektasi Type section
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reversal frequency. Phys. Earth Planet. Inter. 73, 85–108.
Gallet, Y., Besse, J., Krystyn, L., Theveniaut, H., Marcoux, J., 1993.
Magnetostratigraphy of the Kavur Tepe section (southwestern
Turkey); a magnetic polarity time scale for the Norian. Earth
Planet. Sci. Lett. 117, 443– 456.
Gallet, Y., Besse, J., Krystyn, L., Theveniaut, H., Marcoux, J., 1994.
Magnetostratigraphy of the Mayerling section (Austria) and
Erenkolu Mezarlik (Turkey) section; improvement of the Carnian
(Late Triassic) magnetic polarity time scale. Earth Planet.
Sci. Lett. 125, 173–191.
Gallet, Y., Krystyn, L., Besse, J., 1998. Upper Anisian to lower
Carnian magnetostratigraphy from the Northern Calcareous
Alps (Austria). J. Geophys. Res. 103, 605–621.
Gomes, C.R., Diez, J.B., Mohamed, K., Villanueva, U., Soares,
A.F., Rey, D., 2004. Nuevos datos palinoestratigráficos y paleomagnéticos de los afloramientos estefano-pérmicos del Grupo
Bucaco en el sinclinal de Santa Cristina (Norte de Coimbra,
Portugal). Geotemas 6, 291– 294.
Gómez-Gras, D., 1993. El Permotrías de la Cordillera Costero
Catalana: Facies y Petrología Sedimentaría (Parte I). Bol.
Geol. Min. 104, 115– 161.
Goy, A., 1995. Ammonoideos del Triásico Medio de Espana.
Biostratigrafía y correlaciones. Cuad. Geol. Ibér. 19, 21– 26.
Gradstein, F.M., Ogg, J.G., Smith, A.G., Bleeker, W., Lourens, L.J.,
2004. A Geologic Time Scale, with special reference to Precambrian
and Neogene. Episodes 27 (2), 83– 100.
Hernando, S., Schott, J.J., Thuizat, R., Montigny, R., 1980. Age des
andesites et des sediments interstratifies de la region d’Atienza
(Espagne); etude stratigraphique, geochronologique et paleomagnetique.
Sci. Geol., Bull. 33, 119– 128.
Hounslow, M.W., McIntosh, G., 2003. Magnetostratigraphy of the
Sherwood Sandstone Group (Lower and Middle Triassic),
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non-marine Anisian. Palaeogeogr. Palaeoclimatol. Palaeoecol.
193, 325– 348.
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