Results 61 to 70 of about 7,693 (174)

The Missing Magmas of MOR: Insights From Phase Equilibrium Experiments on Plagioclase Ultraphyric Basalts

Geochemistry, Geophysics, Geosystems, 2022
Plagioclase ultraphyric basalts (PUBs) are a class of mid‐ocean ridge (MOR) lavas found in a variety of ocean floor environments, are characterized by abundant (15–40 volume %) plagioclase megacrysts and a diverse trace element and isotopic signature ...
Gokce K. Ustunisik, Roger L. Nielsen, David Walker   +2 more
doaj   +1 more source

Transformation of Refractory Oceanic Lithospheric Mantle by Reactive Melt Infiltration: An Experimental Study on the Roles of Temperature, Melt Volume and Ascent Velocity

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 6, June 2026.
Abstract Reactive melt infiltration critically modifies the physical and chemical properties of the oceanic lithospheric mantle (OLM). This process, involving melt‐rock reactions and in situ crystallization, exhibits substantial spatial and temporal variability driven by melt volume and ascent velocity.
Yong‐Sheng Hou, Hong‐Yan Li, Chao Zhang, Yu Wang, Yi‐Gang Xu   +4 more
wiley   +1 more source

Petrological variability of recent magmatism at Axial Seamount summit, Juan de Fuca Ridge

Geochemistry, Geophysics, Geosystems, 2013
A combined study of mapping, observational, age constraint, and geochemical data at the summit of Axial Seamount, Juan de Fuca Ridge, has revealed its recent petrological history. Multiple basalt types erupted at the summit in a time sequence.
Brian M. Dreyer, David A. Clague, James B. Gill   +2 more
doaj   +1 more source

A Common Reference Material for Mass‐Dependent Sn Isotope Compositions: An Inter‐Laboratory Calibration Approach

Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 341-367, June 2026.
Key Points We recommend using the notation δ122/118SnNIST SRM 3161a for mass‐dependent Sn isotope data. We derived conversion factors relative to NIST SRM 3161a for Puri Sn CEZA (0.132 ± 0.011‰), Sn Lyon (0.229 ± 0.016‰), Sn IPGP (0.162 ± 0.018‰). Tin isotope compositions are presented for SPEX CertiPrep Sn and nine USGS reference materials.
Aurélia C.E. Meister, Manuela A. Fehr, Quentin Amet, Gerhard Brügmann, Caroline Fitoussi, Matthias Friebel, Weiqiang Li, Frederic Moynier, Jia‐Xin She, Xueying Wang, Maria Schönbächler   +10 more
wiley   +1 more source

Constraints on Noble Gas Variability in OIB and MORB From Non‐Equilibrium Magmatic Degassing Models

Geochemistry, Geophysics, Geosystems
Noble gas concentrations in ocean island basalts (OIB) and mid‐ocean ridge basalts (MORB) are affected by degassing processes, obscuring their pre‐eruptive characteristics.
Thomas Williams, Stephen Parman, Christian Huber   +2 more
doaj   +1 more source

Primitive Cretaceous island-arc volcanic rocks in eastern Cuba: the Téneme Formation

Geologica Acta, 2006
The Téneme Formation is located in the Mayarí-Cristal ophiolitic massif and represents one of the three Cretaceous volcanic Formations established in northeastern Cuba.
J.A. PROENZA FERNÁNDEZ, R. DÍAZ-MARTÍNEZ, A. IRIONDO, C. MARCHESI, Joan-Carles Melgarejo i Draper, F. GERVILLA LINARES, C. J. GARRIDO MARÍN, A. RODRÍGUEZ VEGA, J. A. BLANCO-MORENO, R. LOZANO-SANTACRUZ   +9 more
doaj   +1 more source

Combustion and Pyrolysis EA‐IRMS Techniques to Determine the δ2H of Diamonds

Rapid Communications in Mass Spectrometry, Volume 40, Issue 10, 30 May 2026.
ABSTRACT Rationale Diamonds are generally considered to be metasomatic minerals originating from the Earth's mantle. They formed through the interaction of carbon‐bearing fluids or melts with the surrounding deep lithology. Most knowledge about the formation of diamonds comes from studying their mineral inclusions or stable isotopes.
François Fourel, Christophe Lécuyer, Emilie Thomassot, Etienne Deloule, Charles Ojeimi   +4 more
wiley   +1 more source

Triassic MORB magmatism in the southern Mirdita zone (Albania)

, 2006
In southern Albania the Mirdita Ophiolitic nappe is characterized by subophiolitic complexes in which remnants of volcanic ophiolite sequences of Triassic age have been identified, either as rare blocks of variable dimension in the Rubik Complex, or as a thin tectonic unit (the Porava Unit), sited immediately under the main ophiolitic masses of the ...
Valerio Bortolotti, Marco Chiari, Alaudin Kodra, Marta Marcucci, Michele Marroni, Faruk Mustafa, Mensi Prela, Luca Pandolfi, Gianfranco Principi, Emilio Saccani   +9 more
openaire   +6 more sources

Spin Transition of Fe3+ in δ‐(Al,Fe)OOH and Implication for Mid‐Lower Mantle Seismic Heterogeneities

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract δ‐(Al,Fe)OOH is an important water carrier and plays a critical role on Earth's deep water cycle. Lattice parameters of δ‐(Al0.89Fe0.11)OOH were measured by synchrotron single‐crystal X‐ray diffraction at simultaneously high temperature and pressure up to 65 GPa and 800 K in diamond anvil cells.
Chaoshuai Zhao, Zhu Mao, Xinyue Zhang, Yingxin Yu, Ningyu Sun, Jianbo Zhang, Yuzhu Wang, Takayuki Ishii   +7 more
wiley   +1 more source

Deformation of δ‐AlOOH and Its Solid Solution With Phase H as a Potential Source of Intra‐Slab Seismic Anisotropy in the Mid‐Mantle

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Seismic anisotropy is widely observed near subduction zones in the mantle transition zone and uppermost lower mantle, particularly along the western Pacific rim and tracks slabs geometries, implying an additional slab‐related source. Hydrous phases such as δ‐AlOOH and phase H (MgSiO4H2), which form a solid solution (δ‐H) and are stable in cool,
Wentian Wu, Yu Nishihara, Noriyoshi Tsujino, Sho Kakizawa, Yuji Higo   +4 more
wiley   +1 more source