Results 41 to 50 of about 9,158 (119)

Combined Lithophile‐Siderophile Isotopic Constraints on Hadean Processes Preserved in Ocean Island Basalt Sources

Geochemistry, Geophysics, Geosystems, 2021
Detection of Hadean isotopic signatures within modern ocean island basalts (OIB) has greatly influenced understanding of Earth's earliest history and long‐term dynamics.
Bradley J. Peters, Andrea Mundl‐Petermeier, Richard W. Carlson, Richard J. Walker, James M. D. Day   +4 more
doaj   +1 more source

Volatile Element Evidence of Local MORB Mantle Heterogeneity Beneath the Southwest Indian Ridge, 48°–51°E

Geochemistry, Geophysics, Geosystems, 2021
The mantle source beneath the Southwest Indian Ridge (SWIR) reflects a complex history of contamination. Magmatic volatile contents are vital tracers of these kinds of heterogeneities, which may fractionate otherwise constant volatile/non‐volatile ...
Wei Wang, Katherine A. Kelley, Zhenggang Li, Fengyou Chu, Yunpeng Dong, Ling Chen, Yanhui Dong, Jie Li   +7 more
doaj   +1 more source

Light oxygen isotopic composition in deep mantle reveals oceanic crust subduction before 3.3 billion years ago

Communications Earth & Environment
Compositional heterogeneity exists in Earth’s deep mantle, which can be caused by the subduction of oceanic slabs. How early this process started on Earth remains highly debated due to the scarcity of early Archean materials with pristine mantle ...
Dongjian Ouyang, Huiming Bao, Gary R. Byerly, Qiuli Li   +3 more
doaj   +1 more source

Unraveling the Connection Between Subsurface Stress and Geomorphic Features

Geophysical Research Letters
The tectonic stress field induces surface deformation. At long wavelengths, both lithospheric heterogeneity (changes in the thickness and density of crust and lithospheric mantle) and basal tractions from mantle convection contribute to the stress field.
B. Kuhasubpasin, S. Moon, C. Lithgow‐Bertelloni   +2 more
doaj   +1 more source

Global mantle isotopic anomalies linked to supercontinent-superocean evolution for the past 700 million years

Communications Earth & Environment
Earth’s mantle isotopic composition is highly heterogeneous, with enriched and depleted regions1–3 shaped by a complex history of depletion and re-enrichment over 4.5 billion years.
Piero A. B. de Sampaio, Zheng-Xiang Li, Luc S. Doucet   +2 more
doaj   +1 more source

Mantle heterogeneity caused by trapped water in the Southwest Basin of the South China Sea. [PDF]

Nat Commun, 2023
Tian J, Ma Z, Lin J, Xu M, Yu X, Le BM, Zhang X, Zhang F, Guo L.   +8 more
europepmc   +1 more source

Coexistence of calc-alkaline and ultrapotassic alkaline magmas at Mounts Cimini: evidence for transition from the Tuscan to the Roman Magmatic Provinces (central Italy)

Geologica Acta, 2011
The volcanic complex of Mts. Cimini (~0.90-1.30Ma) represents the geographical and chronological transition between the Tuscan Magmatic Province (TMP) and the Roman Magmatic Province (RMP), in central Italy.
M. AULINAS, D. GASPERINI, D. GIMENO TORRENTE, P. MACERA, J.L. FERNÁNDEZ TURIEL, C. CIMARELLI   +5 more
doaj  

How P‐Wave Scattering Throughout the Entire Mantle Mimics the High‐Frequency Pdiff and Its Coda

Geophysical Research Letters
We document the arrival of seismic energy in the core shadow zone up to large distances beyond 150° more than 100 s prior to the core phases. Numerical simulations of the energy transport in an established heterogeneity model show that scattering ...
Tuo Zhang, Christoph Sens‐Schönfelder, Marcelo Bianchi, Klaus Bataille   +3 more
doaj   +1 more source

The Use of Azimuthal Variation in ScS–S Differential Travel Times to Investigate Possible Anisotropy in the Lowermost Mantle Beneath the Philippines

Geosciences
We collected approximately 500 ScS–S differential travel times passing beneath the Philippines with various azimuths to discuss whether there were azimuthal variations in the ScS–S time residuals.
Satoru Tanaka
doaj   +1 more source

Is the Deep Martian Mantle Heterogeneous? A Reappraisal of Seismological Evidences

Geophysical Research Letters
It has been proposed that the deep Martian mantle contains distributed heterogeneities preserved since the accretion of the planet. This result relies on a multiple‐scattering interpretation of frequency‐dependent arrival times of P‐waves detected in the
L. Margerin
doaj   +1 more source