Results 41 to 50 of about 45,633 (206)

Extremely high He isotope ratios in MORB-source mantle from the proto-Iceland plume [PDF]

, 2003
The high ³He/⁴He ratio of volcanic rocks thought to be derived from mantle plumes is taken as evidence for the existence of a mantle reservoir that has remained largely undegassed since the Earth's accretion.
AD Saunders, AK Pedersen, B Marty, B Marty, BB Hanan, BS Hardarson, D Anderson, D Francis, D Porcelli, D Porcelli, DJ DePaolo, DM McKenzie, DR Hilton, DR Hilton, DW Graham, EH Hauri, ET Dixon, Finlay M. Stuart, FM Stuart, FM Stuart, I Robillard, J. Godfrey Fitton, JG Fitton, JG Fitton, JM Eiler, M Honda, MD Kurz, MD Kurz, MJ Whitehouse, RD van der Hilst, Robert M. Ellam, Solveigh Lass-Evans, T Prestvik, V Olive   +33 more
core   +2 more sources

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
doaj   +1 more source

Lateral variations in the crustal structure of the Indo-Eurasian collision zone [PDF]

, 2018
We thank Michael Ritzwoller and two anonymous reviewers for constructive comments that have helped improve the manuscript. The majority of the seismic data used in this study were downloaded from IRIS DMC.
Gilligan, Amy, Priestley, Keith
core   +1 more source

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
doaj   +1 more source

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
doaj   +1 more source

Forming the Moon from terrestrial silicate-rich material [PDF]

, 2013
Recent high-precision measurements of the isotopic composition of lunar rocks demonstrate that the bulk silicate Earth and the Moon show an unexpectedly high degree of similarity.
Anisichkin, V. F., de Meijer, R. J., van Westrenen, W.   +2 more
core   +3 more sources

Elastic properties of Fe-bearing Akimotoite at mantle conditions: Implications for composition and temperature in lower mantle transition zone

Fundamental Research, 2022
The pyrolite model, which can reproduce the upper-mantle seismic velocity and density profiles, was suggested to have significantly lower velocities and density than seismic models in the lower mantle transition zone (MTZ).
Yajie Zhao, Zhongqing Wu, Shangqin Hao, Wenzhong Wang, Xin Deng, Jian Song   +5 more
doaj   +1 more source

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
doaj   +1 more source

The elastic constants of MgSiO3 perovskite at pressures and temperatures of the Earth's mantle

, 2009
The temperature anomalies in the Earth's mantle associated with thermal convection1 can be inferred from seismic tomography, provided that the elastic properties of mantle minerals are known as a function of temperature at mantle pressures.
AR Oganov, Artem R. Oganov, BB Karki, BLN Kennett, C Cavazzoni, C da Silva, D Alfé, DA Yuen, DC Wallace, DL Anderson, E Knittle, F Ancilotto, F Buda, G Kresse, G Masters, G Shen, G. David Price, GS Robertson, JC Castle, John P. Brodholt, M Matsui, M O'Keeffe, O Sugino, P Hohenberg, R Car, S Nosé, S-i Karato, SE Kesson, W Kohn, Y Wang   +29 more
core   +1 more source

Does depleted mantle form an intrinsic part of the Iceland plume? [PDF]

, 2003
Icelandic basalt ranges in composition from voluminous tholeiite, erupted in the rift zones, to small-volume, mildly alkaline basalt erupted off-axis.
Andrew D. Saunders, Björn S. Hardarson, Blichert-Toft, Breddam, Chauvel, Chauvel, Einarsson, Elliott, Fitton, Fitton, Furman, Gee, Hanan, Hanan, Hardarson, Hards, Hofmann, Hémond, J. Godfrey Fitton, Jakobsson, Johnson, Johnson, Kempton, Kempton, Kempton, Kerr, McDonough, Nowell, Pamela D. Kempton, Prestvik, Pálmason, Saunders, Schilling, Schilling, Skovgaard, Slater, Thirlwall, Zindler   +37 more
core   +1 more source