Results 51 to 60 of about 20,808 (214)

Evidence From Microscopy and U–Pb Geochronology as a Clue to the Influence of the Cretaceous Magmatism in the Diagenesis of Pre‐Salt Carbonate Reservoirs in the Santos Basin (Brazil)

Geological Journal, EarlyView.
Carbonates from Santos Basin revealed U–Pb ages correlated with basalt ages (A), suggesting that they were formed during magmatic events. These events placed hot CO2 in the reservoir, which, when mixed with carbonate‐rich cold water (B), led to thermal convection, enabling the formation of the U contained in the carbonates.
Marco António Ruivo de Castro e Brito, Cristiano Leite Sombra, Davy Raeder Brandão, Cleverson Guizan Silva, Sidney Luiz de Matos Mello, Eugênio Vaz dos Santos Neto, Rui Jorge Fernandes Baptista, Ramsés Capilla, Luiz Antônio Pierantoni Gambôa   +8 more
wiley   +1 more source

Biostratigraphy of the Danian/Selandian transition: A case study from Kamestan anticline section, northwest of Izeh city in Khuzestan province, Southern Iran [PDF]

, 2010
The planktonic foraminifera turnover across the Danian-Selandian boundary (early to late Paleocene, ~60 Ma) has been studied in the Kamestan anticline section. The studied interval span planktonic foraminifera zones P2-P3.
Abbas Sadeghi, Nasrin Hadavandkhani
core   +1 more source

Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures [PDF]

, 2018
The reliable determination of past seawater temperature is fundamental to paleoclimate studies. We test the robustness of two paleotemperature proxies by combining Mg/Ca and clumped isotopes (Δ47) on the same specimens of core top planktonic foraminifera.
Bernasconi, Stefano M., Breitenbach, Sebastian F.M., Grauel, Anna Lena, Greaves, Mervyn, Gázquez, Fernando, Hodell, David A., Lo, Li, Mleneck-Vautravers, Maryline J., Müller, Inigo A., non-UU output of UU-AW members, Rolfe, James   +10 more
core   +3 more sources

Holocene sea‐level and environmental changes on the Isle of Mull, Scotland

Journal of Quaternary Science, EarlyView.
ABSTRACT Sea‐level and coastal changes are reconstructed on the Isle of Mull, western Scotland, from 10 988 to 10 507 cal BP to the present. This research has produced the first SLIP for the Isle of Mull. A multiproxy approach including pollen, spore, foraminifera and diatom analyses reveals palaeoenvironmental changes from two coastal sites.
Katherine A. Selby, Jane Wheeler, William E. N. Austin, Heather Austin, Tom Hill, Sarah L. Bradley, Sally Derrett   +6 more
wiley   +1 more source

Facies and paleoenvironmental reconstruction of Early–Middle Miocene deposits in the north-west of the Zagros Basin, Iran

Geologica Carpathica, 2019
Facies analysis and paleoenvironmental reconstruction of the Burdigalian to Langhian Asmari Formation, outcropping in the Khorram Abad Anticline, in the north-west of the Zagros Basin allow us to interpret the carbonate ramp history during the Early ...
Roozpeykar Asghar, Maghfouri-Moghaddam Iraj, Yazdi Mehdi, Yousefi-Yegane Bizhan   +3 more
doaj   +1 more source

Projected impacts of climate change and ocean acidification on the global biogeography of planktonic Foraminifera [PDF]

Biogeosciences, 2015
Planktonic Foraminifera are a major contributor to the deep carbonate flux and their microfossil deposits form one of the richest databases for reconstructing paleoenvironments, particularly through changes in their taxonomic and shell composition. Using
T. Roy, F. Lombard, L. Bopp, M. Gehlen
doaj   +1 more source

Distribution of planktonic foraminifera in the subtropical South Atlantic: depth hierarchy of controlling factors [PDF]

Biogeosciences, 2020
Temperature appears to be the best predictor of species composition of planktonic foraminifera communities, making it possible to use their fossil assemblages to reconstruct sea surface temperature (SST) variation in the past.
D. Lessa, D. Lessa, R. Morard, L. Jonkers, I. M. Venancio, R. Reuter, A. Baumeister, A. L. Albuquerque, M. Kucera   +8 more
doaj   +1 more source

Temperature influence on the carbon isotopic composition of Orbulina universa and Globigerina bulloides (planktonic foraminifera) [PDF]

, 2000
Laboratory experiments with the planktonic foraminifera Orbulina universa (symbiotic) and Globigerina bulloides (nonsymbiotic) were used to examine the effects of temperature, irradiance (symbiont photosynthesis), [CO32-], [HPO42-], and ontogeny on shell
Bemis, B. E., Bijma, Jelle, Lea, D. W., Spero, H. J.   +3 more
core   +1 more source

Early deglaciation history of the southeastern Baffin Island shelf (Eastern Canadian Arctic Archipelago)

Journal of Quaternary Science, EarlyView.
ABSTRACT During the last glacial period, the Laurentide Ice Sheet (LIS) was the largest terrestrial ice sheet on Earth. Its evolution since the Last Glacial Maximum profoundly influenced Earth's geodynamics and surface processes. Investigating the past dynamics of the LIS provides critical insights into how contemporary ice sheets may respond to ...
Alexis P. Belko, Alexandre Normandeau, Patrick Lajeunesse, Audrey Limoges   +3 more
wiley   +1 more source

Palaeoenvironmental, palaeoecological and palaeobiogeographical implications of mixed fresh water and brackish marine assemblages from the Cretaceous-Palaeogene Deccan intertrappean beds at Jhilmili, Chhindwara District, central India

Revista Mexicana de Ciencias Geológicas, 2018
The Deccan infra- and intertrappeans volcano-sedimentary sequences have been considered as terrestrial to fluvio-lacustrine deposits. Presence of planktonic foraminifera and brackish water ostracods in the Jhilmili basal Danian intertrappean beds ...
Ashu Khosla
doaj   +1 more source