Results 41 to 50 of about 7,541 (160)

A discovery of nanoscale sulfide droplets in MORB glasses: implications for the immiscibility of sulfide and silicate melts

Frontiers in Earth Science
Sulfur forms an immiscible liquid upon saturation in magma, and sulfide droplets are commonly found in fresh mid-ocean ridge basalt (MORB). Scanning electron microscopy (SEM) analysis revealed that the fine-grained and weakly phyric MORB samples ...
Lei Zuo, Peng Zhang, Ya-qin Wang, Rui Liu   +3 more
doaj   +1 more source

Assessing the Impacts of Recent Crop Expansion on Water Quality in the Missouri River Basin Using the Soil and Water Assessment Tool

Journal of Advances in Modeling Earth Systems, 2021
The Missouri River Basin (MORB) has experienced a resurgence of grassland conversion to crop production, which raised concerns on water quality. We applied the Soil and Water Assessment Tool (SWAT) to address how this conversion would impact water ...
Pan Chen, Yongping Yuan, Wenhong Li, Stephen D. LeDuc, Tyler J. Lark, Xuesong Zhang, Christopher Clark   +6 more
doaj   +1 more source

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

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

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

Electrical Conductivity of Amorphous and Molten CaCO3 at High Pressures and Its Implications for Mantle Conductivity Anomalies

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Impedance spectrometry experiments have been conducted on CaCO3 up to 15 GPa and 2,100 K to identify its state under high pressure. The melting temperature of CaCO3 was also determined by the falling of a Re sphere observed via X‐ray radiography. The phase transition from aragonite to the amorphous phase does not cause a leap in the Electrical
Bin Zhao, Takashi Yoshino, Qi Chen, Tony Yu, Dongzhou Zhang, Bin Chen, Yanbin Wang   +6 more
wiley   +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

Why is the remanent magnetic intensity of Cretaceous MORB so much higher than that of mid to late Cenozoic MORB? [PDF]

Geosphere, 2005
The fact that the natural remanent magnetization (NRM) intensity of mid-oceanicridge basalt (MORB) samples shows systematic variations as a function of age has long been recognized: maximum as well as average intensities are generally high for very young samples, falling off rather rapidly to less than half the recent values in samples between 10 and ...
Daming Wang, Rob Van der Voo, Donald R. Peacor   +2 more
openaire   +1 more source

Associations of Cancer‐Related Posttraumatic Stress Symptoms and Gender With Health Behaviors Among Caregivers of Adult Patients With Colorectal Cancer

Psycho-Oncology, Volume 35, Issue 3, March 2026.
ABSTRACT Background The life‐threatening nature of cancer can precipitate posttraumatic stress symptoms (PTSS) in family caregivers. PTSS can lead to unhealthy coping and maladaptive health behaviors. Aims We explored the extent to which PTSS are associated with health behaviors of caregivers and the moderating role of gender.
Hannah‐Rose Mitchell, Thomas C. Tsai, Cecilia Quintana, Youngmee Kim   +3 more
wiley   +1 more source

Geodynamic Controls on Mantle Differentiation and Preservation of Long‐Term Geochemical Heterogeneity: Focus on the Primitive Undegassed Mantle

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract The compositional evolution of the Earth's mantle is the result of mantle differentiation and thermal evolution. Partial melting of mantle materials produces geochemical heterogeneities, allows for degassing and depends on the thermal state of the mantle, itself governed by convection.
Nicolas Récalde, J. Huw Davies, James Panton, Don Porcelli, Morten Andersen   +4 more
wiley   +1 more source