Results 71 to 80 of about 10,806 (258)

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

Re-os isotope constraints on the age of the Lithospheric mantle beneath western Greenland. [PDF]

, 2007
Alkaline magmatic activity across Western Greenland (W.G.) provides a record of lithosphere evolution over the last 600 Ma. Ultra Mafic Lamprophyre (UML) magmatism in particular has erupted an exceptional inventory of mantle xenoliths allowing a detailed
Webb, Michelle
core  

1. Experimental Investigation of Hydrous Melting of the Earth’s Upper Mantle, and 2. Olivine Abundances and Compositions in Hawaiian Lavas [PDF]

, 2010
(1) The presence of small amounts of water dissolved within nominally-anhydrous minerals in the earth has significant effects on the chemistry of melting in the Earth’s mantle.
Balta, Joseph Brian
core   +2 more sources

Carbonate- and silicate-metasomatized mantle beneath Himalayan-Tibetan orogenic belt

Communications Earth & Environment
The extreme geochemical enrichment of post-collisional potassium-rich lava in the Alpine-Himalayan orogenic belt has led researchers to hypothesize that enrichment is inherited from a metasomatized mantle source potentially incorporating crustal ...
Weikai Li, Zhiming Yang, Zoltán Zajacz, Limin Zhou, Zengqian Hou   +4 more
doaj   +1 more source

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, EarlyView.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

The Zagros Core: Deformation of the continental lithospheric mantle [PDF]

The Zagros of Iran form one of the youngest collisional orogenic belts on Earth. At shallow depths, shortening across the Zagros is accommodated by folding in the sediments, high-angle thrust faulting in the basement and thickening of the lower crust ...
Barron, J., Debayle, E., McKenzie, D. P., Tatar, M., Priestley, K. F.   +4 more
core   +1 more source

The participation of ilmenite-bearing cumulates in lunar mantle overturn [PDF]

, 2019
The ilmenite-bearing cumulates (IBC) formed from the solidification of the lunar magma ocean are thought to have significantly affected the long-term evolution of the lunar interior and surface. Their high density is considered to trigger Rayleigh–Taylor
Mantle dynamics & theoretical geophysics, W. van Westrenen, van Westrenen, W.; id_orcid, van den Berg, A.P., Jacobs, M. H. G., J. de Vries, van den Berg, A. P., Zhao, Y., van Westrenen, W., Y. Zhao, A.P. van den Berg, de Vries, J., De Vries, Jellie, Jacobs, M. H.G., M.H.G. Jacobs   +14 more
core   +1 more source

Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites

Nature Communications, 2023
The diamond potential of kimberlites is difficult to assess due to several mantle and magmatic processes affecting diamond content. Traditionally, initial evaluations are based on the compositions of mantle-derived minerals (garnet, chromite ...
Andrea Giuliani, David Phillips, D. Graham Pearson, Soumendu Sarkar, Alex A. Müller, Yaakov Weiss, Robin Preston, Michael Seller, Zdislav Spetsius   +8 more
doaj   +1 more source

Impact provenance and age of a unique basalt found in Apollo 12 regolith

Meteoritics &Planetary Science, EarlyView.
Abstract Basaltic sample 12032,366‐18 from the Apollo 12 landing site is distinct among basalts collected at this site, other Apollo landing sites, and lunar meteorites in terms of its age, bulk rock composition, and isotopic composition. We present new Pb isotopic data obtained by in situ Secondary Ion Mass Spectrometry on multiple mineral phases in ...
C. Deligny, M. J. Whitehouse, R. E. Merle, H. Jeon, A. A. Nemchin, B. L. Jolliff   +5 more
wiley   +1 more source

Petrological features of Subei Basin (Eastern China) lithospheric mantle and their relationships with H2O contents in NAMs [PDF]

, 2010
The Subei basin is located east of the Tanlu fault, a major discontinuity which separates the Archean North China Craton from the Proterozoic Yangtze Craton.
Hao, Yantao
core