Results 61 to 70 of about 4,715 (162)

Optimization of Pretreatment Method for Tl Isotope Analysis of Geological Samples

Yankuang ceshi
The thallium (Tl) isotope system can be utilized to track various geological processes, but the current sample digestion and ion exchange methods used for Tl isotope analysis take a long time. To improve the efficiency of chemical pretreatment of samples
Jinjie QI, Hongxia YU, Qinghong XU, Yonghai YUAN, Feng YANG, Huiping ZHANG   +5 more
doaj   +1 more source

Extreme enriched-mantle (EM) compositions recorded by the Sr-Nd-Hf isotopes of global cratonic lamproites

Geochimica et Cosmochimica Acta
Cratonic lamproites are rare ultrapotassic rocks that occur in every continent and were emplaced over the last 2 billion years. Owing to their highly radiogenic Sr and unradiogenic Nd-Hf isotopic compositions along with enrichment in K and incompatible trace elements (e.g., Ba, Sr, Ti, Zr), lamproites are believed to be formed by melting geochemically ...
Sarkar, Soumendu, Dalton, Hayden, Giuliani, Andrea; id_orcid0000-0002-6823-2807, Phillips, David, Graham Pearson, D., Nowell, Geoff M., Woodhead, Jon D., Hergt, Janet, Maas, Roland, Jaques, Alan Lynton, Chalapathi Rao, Nittala V., Weiss, Yaakov, Ghosh, Sujoy   +12 more
openaire   +2 more sources

Variations in Hawaiian Plume Flux Controlled by Ancient Mantle Depletion

AGU Advances
Mantle plumes—upwellings of buoyant rock in Earth's mantle—feed hotspot volcanoes such as Hawai‘i. The size of volcanoes along the Hawai‘i–Emperor chain, and thus the magma flux of the Hawaiian plume, has varied over the past 85 million years.
Paul Béguelin, Andreas Stracke, Maxim D. Ballmer, Shichun Huang, Michael Willig, Michael Bizimis   +5 more
doaj   +1 more source

The ESO SupJup Survey

Astronomy & Astrophysics
Context. The distinct formation pathways proposed for directly imaged exoplanets and isolated brown dwarfs might leave imprints in the inherited chemical composition.
de Regt S., Snellen I. A. G., González Picos D., Gandhi S., Grasser N., Kesseli A. Y., Landman R., Mollière P., Nasedkin E., Stolker T., Zhang Y.   +10 more
doaj   +1 more source

Miocene Alkaline Basaltic Magmatism in Northeastern Tibetan Plateau: Implications for Mantle Evolution and Plateau Outward Growth

Geochemistry, Geophysics, Geosystems
The widespread Cenozoic alkaline magmatism within and around the Tibetan Plateau offers a prime opportunity to probe the nature of the mantle at the depths where basalt magmas originate.
Yue Che, Dong Liu, Zhidan Zhao, Yaoling Niu, Fang‐Zhen Teng, Donald J. DePaolo, Xuehui Yu, Di‐Cheng Zhu, Ningyuan Qi, Xuanxue Mo   +9 more
doaj   +1 more source

The Age and Composition of the Voyager Seamounts: Evidence for a Long‐Lived Marquesas Mantle Source

Geochemistry, Geophysics, Geosystems
We present new observations on the dynamics and locations of deep mantle reservoirs derived from the ages and compositions of Voyager Seamount Chain lava flows.
Andrea Balbas, Hannah Paradis, Kevin Konrad, Valerie A. Finlayson, Michael Bizimis, Stephanie Anderson, Christopher Kelley, Nicole A. Raineault, Beth N. Orcutt   +8 more
doaj   +1 more source

Geochemistry and petrology of three granitoid rock cores from the Nicaraguan Rise, Caribbean Sea: implications for its composition, structure and tectonic evolution

Geologica Acta, 2011
The Nicaraguan Rise is a major submarine structure of poorly known origin. Its lithologies have been studied from dredge hauls and land outcrops on the Greater Antilles and Central America and its structure from geophysical data. In this paper we present
J.F. LEWIS, G. KYSAR MATTIETTI, M. PERFIT, G. KAMENOV   +3 more
doaj  

Body Water During Pregnancy: Physiology, Clinical Significance and Assessment Methods: A Narrative Review. [PDF]

Nutrients
Flores-Quijano ME, Sámano R, Barrientos-Galeana E, Borboa-Olivares H.   +3 more
europepmc   +1 more source

Insights into early continental crust formation from the most ancient heart of Scotland. [PDF]

Nat Commun
Volante S, Torres-Mancinelli F, Kaempf J, Barrote V, Johnson T, Kirkland C, Scicchitano MR, Tavazzani L, Basak S, Bouvier AS, Dziggel A, Gerdes A.   +11 more
europepmc   +1 more source

Contemporaneous mobile- and stagnant-lid tectonics on the Hadean Earth. [PDF]

Nature
Valley JW, Blum TB, Kitajima K, Shimizu K, Spicuzza MJ, Gonzalez JP, Kita NT, Bauer AM, Sobolev SV, Jain C, Cavosie AJ, Sobolev AV.   +11 more
europepmc   +1 more source