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A Complementary Section for the Proposed Toarcian (Lower Jurassic) Global Stratotype: the Almonacid De La Cuba Section (Spain)

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Comas Rengifo, María José and Arias Fernández, María del Carmen and Gómez Fernández, Juan José and Goy, Antonio and Herrero Matesanz, Concepción and Osete López, María Luisa and Palencia Ortas, Alicia (2010) A Complementary Section for the Proposed Toarcian (Lower Jurassic) Global Stratotype: the Almonacid De La Cuba Section (Spain). Stratigraphy and Geological Correlation, 18 (2). pp. 133-152. ISSN 0869-5938

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Official URL: http://www.maik.rssi.ru/cgi-perl/journal.pl?lang=eng&name=strteng



Abstract

We present the biostratigraphy (ammonites, brachiopods, foraminifers, and ostracodes), lithostratigraphy, sedimentology, sequence stratigraphy, magnetostratigraphy, and isotope stratigraphy of the
Almonacid de la Cuba section located in the Iberian Range, central eastern Spain. This section, which contains a continuous and expanded record of the Pliensbachian–Toarcian boundary (Early Jurassic), has been
proposed as a complementary section for the Toarcian GSSP. An excellent ammonite based biozonation has
been obtained. Four ammonite assemblages characterized by the presence of Pleuroceras, Canavaria, Dactylio
ceras (Eodactylites), and Dactylioceras (Orthodactylites) have been distinguished. The base of the Toarcian is
located at level CU35.2, based on the first occurrence of Dactylioceras. The occurrence of taxa from the NW
European and the Mediterranean provinces is useful to improve the correlation between both provinces. For
aminiferal and ostracode assemblages are rich and diversified and no significant biostratigraphic events take
place at the Pliensbachian–Toarcian boundary. The magnetostratigraphic data presented here are the most
complete record of reversals of the earth magnetic field for the Pliensbachian–Toarcian boundary. A good
record of the onset of the positive δ13C excursion reported in the Lower Toarcian of many European sections
has been obtained. Average paleotemperatures measured at the latest Pliensbachian Spinatum Biochron of
about 12.5°C, recorded a marked increase of the seawater temperature which started during the Toarcian,
reaching average temperatures of 16.7°C at the Tenuicostatum Biochron. The obtained 87Sr/86Sr values fully
agree with the LOWESS calibration curve.


Item Type:Article
Uncontrolled Keywords:Complementary Global Stratotype Section and Point, Biostratigraphy, Ammonites, Brachiopods, Foraminifera, Ostracodes, Magnetostratigraphy, Geochemistry, Lower Jurassic, Spain
Subjects:Sciences > Geology > Paleontology
ID Code:26716
Deposited On:16 Sep 2014 12:19
Last Modified:11 Dec 2018 08:42

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