000099646 001 __ 99646
000099646 005 __20140219120620.0
000099646 024 8_ $9 driver $9 artpubuab $a oai:ddd.uab.cat:99646
000099646 024 7_ $2 doi $a 10.1344/105.000001670
000099646 035 __ $9 articleid $a 16965728v10n3p209
000099646 041 __ $a eng
000099646 100 __ $a Astibia, H. $u Universidad del País Vasco. Departamento de Estratigrafía y Paleontología
000099646 245 1_ $a Increasing size and abundance of microbialites (oncoids) in connection with the K/T boundary in non-marine environments in the South Central Pyrenees
000099646 520 3_ $a A layer rich in giant microbialites, developed within continental deposits of the Tremp Formation (South-Central Pyrenees) in the aftermath of the end-Cretaceous mass extinctions, is here reported for the first time. Its stratigraphic location just above the Latest Maastrichtian Reptile Sandstone unit, and a characteristic 13C anomaly, are clear proofs linking this so-called “z” layer to the K/T boundary. The great abundance of microbialites, their outsized dimensions (oncoids with coating thickness up to 1.2m; average >50mm), and the great lateral continuity of the “z” layer in the study zone, support the hypothesis that these giant microbialites may represent disaster forms linked to the latest Mesozoic crisis. To our knowledge, this is the first time a record of this type is reported in continental realms. Other large continental oncoids and stromatolite constructions (e.g., in the Late Palaeogene deposits of the Pyrenees, Ebro basin, and Mallorca island) differ from those of the “z” layer in occurring in carbonate rocks and in having less lateral continuity, but they could also have been favoured by palaeoenvironmental crises, such as the global Eocene hyperthermals, Early Eocene Climatic Optimum, Middle Eocene Climatic Optimum, and the climatic cooling of the Eocene-Oligocene transition. It is thus possible that some layers of microbialites may record biotic crises in continental series, as they do in the marine record.
000099646 540 __ $a Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet l'ús comercial de l'obra i de les possibles obres derivades, la distribució de les quals s'ha de fer amb una llicència igual a la que regula l'obra original. $u http://creativecommons.org/licenses/by-sa/3.0/es/
000099646 546 __ $a Anglès
000099646 599 __ $a recerca
000099646 653 1_ $a K/T boundary
000099646 653 1_ $a Oncoids
000099646 653 1_ $a Non-marine environments
000099646 653 1_ $a South Pyrenean basin
000099646 655 _4 $a info:eu-repo/semantics/article
000099646 655 _4 $a info:eu-repo/semantics/publishedVersion
000099646 700 __ $a López-Martínez, N. $u Universidad Complutense de Madrid. Departamento de Paleontología
000099646 700 __ $a Elorza, J. $u Universidad del País Vasco. Departamento de Mineralogía y Petrología
000099646 700 __ $a Vicens, E. $u Universitat Autònoma de Barcelona. Departament de Geologia
000099646 773 __ $g Vol. 10, Núm. 3 (Setembre 2012), p. 209-226 $t Geologica acta $x 1696-5728
000099646 856 40 $p 18 $s 3771834 $u http://ddd.uab.cat/pub/geoact/geoact_a2012m9v10n3/geoact_a2012m9v10n3p209.pdf
000099646 973 __ $f 0209 $l 226 $m Setembre $n 3 $v 10 $x geoact_a2012m9v10n3 $y 2012
000099646 980 __ $a ARTPUB $b UAB $b GEOACT