Results 71 to 80 of about 1,722,612 (173)

Localization of carbonate platforms in ordovician formations of West-Siberian geosyneclise

Известия Томского политехнического университета: Инжиниринг георесурсов, 2017
The relevance of the research lies in the need to increase facilities for searching oil and gas fields, one of which is a carbonate platform in the pre-Jurassic formation of West Siberia.
Aleksandr Evgenievich Koveshnikov, Vladimir Alekseevich Kontorovich, Svetlana Nikolaevna Makarenko, Gennady Mikhailovich Tatyanin   +3 more
doaj   +2 more sources

New SHRIMP U-Pb data from the Famatina Complex: constraining Early–Mid Ordovician Famatinian magmatism in the Sierras Pampeanas, Argentina

Geologica Acta, 2009
New SHRIMP U-Pb zircon ages are reported for igneous and sedimentary rocks of the Famatina Complex, constraining the age of the magmatism and the ensialic basins.
J.A. DAHLQUIST, R.J. PANKHURST, C.W. RAPELA, C. GALINDO, P. ALASINO, C.M. FANNING, J. SAAVEDRA, E.G. BALDO   +7 more
doaj  

Breaking the ice: multiple origins of ice‐binding/antifreeze proteins

The FEBS Journal, EarlyView.
Ice‐binding proteins (IBPs) evolved independently in many organisms during Cenozoic cooling and glaciation. In flounders, α‐helical IBPs evolved from an antiviral protein, while similar IBPs arose independently from different progenitors in three other fish lineages.
Laurie A. Graham, Peter L. Davies
wiley   +1 more source

Conditions and timing for the precipitation of early marine diagenetic dolomite in the Triassic Dolomia Principale (northern Italy)

Sedimentology, EarlyView.
ABSTRACT Thermodynamic constraints and empirical evidence often suggest that fabric‐retentive replacement dolomites are stable carbonate minerals that preserve ancient seawater properties. This study evaluates this hypothesis by examining the Upper Triassic Dolomia Principale in Northern Italy.
Vivien Folliot, Giovanna Della Porta, Mathias Mueller, Fabrizio Berra, Benjamin F. Walter, Aratz Beranoaguirre, Sylvia Riechelmann, Oskar Schramm, Adrian Immenhauser   +8 more
wiley   +1 more source

Salt Range Formation of Pakistan Preserves Unique Record of Volcanic Fertilization During the Ediacaran Shuram Excursion

Terra Nova, EarlyView.
ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley, Ryan J. McAleer, Jay M. Thompson, Brett J. Valentine, Imran Khan   +4 more
wiley   +1 more source

Remelting of Ordovician migmatites and granites during Variscan high-grade metamorphism (Aar Massif, Central Alps, Switzerland) [PDF]

Swiss Journal of Geosciences
The remelting of felsic gneisses, migmatites and granite during a later orogenic cycle can produce rocks of different age with comparable field appearance, microstructure, mineralogical and chemical composition.
Urs Schaltegger, Alfons Berger, Jürgen Abrecht, Alexey Ulianov, Eliana Noroña Muñoz, Daniela Rubatto, Maria Ovtcharova, Agathe Martignier, Richard Spikings, Michael Wiederkehr   +9 more
doaj   +3 more sources

Nacre in Molluscs from the Ordovician of the Midwestern United States

Geosciences, 2013
Nacre was previously thought to be primitive in the Mollusca, but no convincing Cambrian examples are known. This aragonitic microstructure with crystal tablets that grow within an organic framework is thought to be the strongest, most fracture-resistant
Steven D.J. Baumann, William P. Heimbrock, Antonio Checa, Michael J. Vendrasco   +3 more
doaj   +1 more source

New paleontological and geological data on the Ordovician and Silurian of Bolivia

, 1996
International audienceThe oldest vertebrates of South America are from the thick Anzaldo (=Cuchupunata) Formation in central Bolivia. At the scale of the basin, the Anzaldo is overlain by the San Benito, Tokochi, Cancanri, Llallagua and Kirusillas/Uncia ...
T. Sempere, M. Vanguestaine, A. Blieck, Vanguestaine, M., Blieck, A., Sempéré, Thierry, Gagnier, P.-Y., Vachard, D., Emig, C.C., C.C. Emig, Gagnier, P.Y., D. Vachard, Sempere, T., P.Y. Gagnier   +13 more
core   +1 more source

Characteristics, distribution, and origin of ferruginous deposits within the Late Ordovician glaciogenic setting of Arabia. [PDF]

Sci Rep, 2023
Alqubalee A, Salisu AM, Bello AM, Al-Hussaini A, Al-Ramadan K.   +4 more
europepmc   +1 more source

Rapid marine oxygen variability: Driver of the Late Ordovician mass extinction. [PDF]

Sci Adv, 2022
Kozik NP, Young SA, Newby SM, Liu M, Chen D, Hammarlund EU, Bond DPG, Them TR, Owens JD.   +8 more
europepmc   +1 more source