RT Journal Article
T1 A Complementary Section for the Proposed Toarcian(Lower Jurassic) Global Stratotype:the Almonacid De La Cuba Section (Spain)
A1 Comas Rengifo, María José
A1 Arias Fernández, María Del Carmen
A1 Gómez Fernández, Juan José
A1 Goy Goy, Antonio
A1 Herrero Matesanz, M. De La Concepción
A1 Osete López, María Luisa
A1 Palencia Ortas, Alicia
AB We present the biostratigraphy (ammonites, brachiopods, foraminifers, and ostracodes), lithostratigraphy, sedimentology, sequence stratigraphy, magnetostratigraphy, and isotope stratigraphy of theAlmonacid 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 beenproposed as a complementary section for the Toarcian GSSP. An excellent ammonite based biozonation hasbeen obtained. Four ammonite assemblages characterized by the presence of Pleuroceras, Canavaria, Dactylioceras (Eodactylites), and Dactylioceras (Orthodactylites) have been distinguished. The base of the Toarcian islocated at level CU35.2, based on the first occurrence of Dactylioceras. The occurrence of taxa from the NWEuropean and the Mediterranean provinces is useful to improve the correlation between both provinces. Foraminiferal and ostracode assemblages are rich and diversified and no significant biostratigraphic events takeplace at the Pliensbachian–Toarcian boundary. The magnetostratigraphic data presented here are the mostcomplete record of reversals of the earth magnetic field for the Pliensbachian–Toarcian boundary. A goodrecord of the onset of the positive δ13C excursion reported in the Lower Toarcian of many European sectionshas been obtained. Average paleotemperatures measured at the latest Pliensbachian Spinatum Biochron ofabout 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 fullyagree with the LOWESS calibration curve.
PB Mikhail A. Semikhatov
SN 0869-5938
YR 2010
FD 2010
LK https://hdl.handle.net/20.500.14352/44365
UL https://hdl.handle.net/20.500.14352/44365
LA eng
DS Docta Complutense
RD 9 abr 2025