Results 31 to 40 of about 9,158 (119)

Trace Element Evidence of Subduction-Modified Mantle Material in South Mid-Atlantic Ridge 18–21°S Upper Mantle

Journal of Marine Science and Engineering, 2023
Mid-ocean ridge basalts (MORBs), produced at mid-ocean ridge where the continents and subduction zones are distant, are the product of partial melting of the upper mantle and their chemical composition can provide information about the mantle itself. The
Tianxiao Ji, Zhigang Zeng
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Chemical Geodynamics Insights From a Machine Learning Approach

Geochemistry, Geophysics, Geosystems, 2022
The radiogenic isotope heterogeneity of oceanic basalts is often assessed using 2D isotope ratio diagrams. But because the underlying data are at least six dimensional (87Sr/86Sr, 143Nd/144Nd, 176Hf/177Hf, and 208,207,206Pb/204Pb), it is important to ...
A. Stracke, M. Willig, F. Genske, P. Béguelin, E. Todd   +4 more
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Mantle heterogeneity beneath the oceanic crust of forearc basin of Nain ophiolite based on the composition of pyroxenes in harzburgites [PDF]

پترولوژی
IntroductionThe Nain ophiolite in Central Iran has been the subject of numerous petrological investigations, particularly focusing on its ultramafic rocks.
Elahe Safdari, Nargess Shirdashtzadeh
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Identifying Recycled Materials Using Mo Isotopes in Intraplate Alkali Basalts From the Southeastern Margin of Tibetan Plateau

Geochemistry, Geophysics, Geosystems
Mantle heterogeneity in lithology and geochemistry is often attributed to recycled subducted materials. While distinct mantle end‐members are identified by radiogenic isotopes, the specific recycled materials contributing to this heterogeneity remain ...
Dongjing Xu, Yue Qi, Qiang Wang, Jie Li, Derek A. Wyman, Andrew C. Kerr, Xiuzheng Zhang, Peina Guo   +7 more
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Cu‐Isotope Evidence for Subduction Modification of Lithospheric Mantle

Geochemistry, Geophysics, Geosystems, 2022
Ultramafic xenoliths from southeastern Arizona, USA, provide evidence for Cu‐isotope heterogeneity in the lithospheric mantle. We report new data on Type I (Cr‐, Mg‐rich) peridotites, but also the first Cu‐isotope data for Fe‐Ti‐Al‐rich Type II ...
Pamela D. Kempton, Ryan Mathur, Russell S. Harmon, Aaron Bell, Jochen Hoefs, Barry Shaulis   +5 more
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Effects of Heat‐Producing Elements on the Stability of Deep Mantle Thermochemical Piles

Geochemistry, Geophysics, Geosystems, 2020
Geochemical observations of ocean island and mid‐ocean ridge basalts suggest that abundances of heat‐producing elements (HPEs: U, Th, and K) vary within the mantle.
Robert I. Citron, Diogo L. Lourenço, Alfred J. Wilson, Antoniette G. Grima, Scott A. Wipperfurth, Maxwell L. Rudolph, Sanne Cottaar, Laurent G. J. Montési   +7 more
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Seamounts in the Subduction Factory [PDF]

Oceanography, 2010
The “Subduction Factory” is a metaphor for the geochemical processing of subducted oceanic crust and sediment into components that are either incorporated into the volcanic arc or recycled into Earth’s mantle.
Hubert Staudigel, Anthony A.P. Koppers, Terry A. Plank, Barry B. Hanan   +3 more
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Ancient recycled lower crust in the mantle source of recent Italian magmatism

Nature Communications, 2019
Recycling of Earth’s crust through subduction and delamination contributes to mantle heterogeneity. Here, the authors measure coupled Sr-Nd-Pb isotope compositions of melt inclusions in Italian potassium-rich lavas, they suggest their results indicate a ...
Janne M. Koornneef, Igor Nikogosian, Manfred J. van Bergen, Pieter Z. Vroon, Gareth R. Davies   +4 more
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Density structure of Earth’s lowermost mantle from Stoneley mode splitting observations

Nature Communications, 2017
Large-low-shear-wave velocity provinces (LLSVPs) are present at the core–mantle boundary. Here, the authors show that splitting of Stoneley modes is probably due to a lower density of LLSVPs than the surrounding mantle because of the presence of post ...
Paula Koelemeijer, Arwen Deuss, Jeroen Ritsema   +2 more
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Heterogeneity in mantle carbon content from CO2-undersaturated basalts

Nature Communications, 2017
Melting dynamics are affected by the amount of carbon in the Earth’s mantle. Le Voyeret al. report undegassed carbon concentrations from olivine-hosted melt inclusions from the Mid-Atlantic Ridge finding that carbon content varies by two orders of ...
M. Le Voyer, K.A. Kelley, E. Cottrell, E.H. Hauri   +3 more
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