Multistratigraphic records of the Lower Cretaceous (Valanginian-Cenomanian) Puez key area in N. Italy

Autor(es):Mostrar menos -

Lukeneder, Alexander ^[1] ; Sotak, Jan ^{[2, 3]} ; Jovane, Luigi ^[4] ; Giorgioni, Martino ^{[4, 5]} ; Savian, Jairo F. ^[6] ; Halasova, Eva ^[7] ; Rehakova, Daniela ^[7] ; Jozsa, Stefan ^[7] ; Kroh, Andreas ^[1] ; Florindo, Fabio ^[8] ; Sprovieri, Mario ^[9]

Afiliação do(s) autor(es)

^[1] Nat Hist Museum Vienna, Geol & Palaeontol Dept, Burgring 7, A-1010 Vienna - Austria

^[2] Slovak Acad Sci, Inst Earth Sci, Dumbierska 1, Banska Bystrica - Slovakia

^[3] Catholic Univ, Dept Geog, Fac Educ, Hrabovska Cesta 1, Ruzomberok 03401 - Slovakia

^[4] Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, BR-05508120 Sao Paulo, SP - Brazil

^[5] Swiss Fed Inst Technol, Inst Geol, Sonneggstr 5, CH-8092 Zurich - Switzerland

^[6] Univ Fed Rio Grande do Sul, Inst Geociencias, Dept Geol, Ave Bento Goncalves 9500, BR-91501970 Porto Alegre, RS - Brazil

^[7] Comenius Univ, Fac Nat Sci, Dept Geol & Palaeontol, Ilkovicova 6, Bratislava 84215 - Slovakia

^[8] INGV, Via Vigna Murata 605, I-00143 Rome - Italy

^[9] Univ Palermo, Dipartimento Geol & Geodesia, Via Archirafi 22, I-90123 Palermo - Italy

• Tipo de documento: Artigo Científico
• Fonte: PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY; v. 447, p. 65-87, APR 1 2016.
• Citações Web of Science: 2

Resumo

We present a stratigraphic investigation of a Hauterivian to Cenomanian hemipelagic succession from Col Puez, in the Dolomites (Southern Alps, northern Italy). A composite section of seven segments was studied with bio-, magneto-, and chemostratigraphy, which enabled detailed and robust age calibration of the Puez succession. It also revealed the paleoceanographic history and helped identify the important global climatic events of that period. The age of the Lower Cretaceous Puez Formation in the Dolomites is refined as late Hauterivian to early Cenomanian. Ammonoids provide a detailed biostratigraphic subdivision that forms the basis for analyses of the faunal distribution and the paleoenvironmental evolution of basins and plateaus across the Tethys. The succession consists of fades similar to those of coeval units in the Tethys, apart from the late Barremian to late Aptian interval, which is marked by a major hiatus followed by a few-meters-thick redbed of late Aptian age. The Lower Cretaceous was characterized by a weak (similar to 1%.) positive delta C-13 trend, punctuated by a positive shift in the late Hauterivian corresponding to the Faraoni Level. Oxygen isotope values show a decreasing trend from the Hauterivian to the Albian/Cenomanian, which mirrors a long-term increasing trend in paleotemperatures from similar to 15-18 degrees C to similar to 25-30 degrees C. This is in agreement with global paleotemperature reconstructions for this period representing the onset of mid-Cretaceous super-greenhouse conditions. Nonetheless, no black shale occurs at the intervals equivalent to Aptian-Albian oceanic anoxic events (OAE), suggesting unique paleoceanographic conditions (enhanced current activity on a submarine height) on the Trento Plateau area during the mid Cretaceous. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/22018-3 - Avaliação da produtividade primária marinha através do estudo das bactérias magnetotáticas em sedimentos
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Jovens Pesquisadores
• Processo FAPESP: 12/15995-5 - Geoquímica dos isótopos estáveis como instrumento para entender a paleoceanografia e o paleoclima no período Eoceno e Oligoceno
• Beneficiário: Martino Giorgioni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado