Results 71 to 80 of about 552,470 (226)

Granite magmatism and mantle filiation [PDF]

European Journal of Mineralogy
Current granite magma generation models essentially reduce to two groups: (1) intra-crustal melting and (2) basaltic origin. A mixed, crustal, and basaltic origin and therefore a mantle filiation has been proposed for most granite magma types.
M. Pichavant, A. Villaros, J. A.-S. Michaud, B. Scaillet   +3 more
doaj   +1 more source

Competing effects of spreading rate, crystal fractionation and source variability on Fe isotope systematics in mid-ocean ridge lavas

Scientific Reports, 2021
Two-thirds of the Earth is covered by mid-ocean ridge basalts, which form along a network of divergent plate margins. Basalts along these margins display a chemical diversity, which is consequent to a complex interplay of partial mantle melting in the ...
Marianne Richter, Oliver Nebel, Martin Schwindinger, Yona Nebel-Jacobsen, Henry J. B. Dick   +4 more
doaj   +1 more source

Scaffold‐free three‐dimensional culture of chronic lymphocytic leukaemia preserves B–T‐cell cross‐talk and enables drug response profiling

British Journal of Haematology, EarlyView.
Summary Chronic lymphocytic leukaemia (CLL) presents a complex biological and clinical landscape, strongly influenced by the tumour microenvironment (TME). To better capture this heterogeneity, we have developed patient‐derived lymphoma spheroids from CLL samples (CLL‐PDLS), which recapitulate the cross‐talk between malignant cells and the autologous ...
Heribert Playa‐Albinyana, Ariadna Giró, Juan A. Piñeyroa, Ferran Araujo‐Ayala, Cèlia Dobaño‐López, Sara Otín‐Sánchez, Elías Campo, Christine Bezombes, Patricia Pérez‐Galán, Dolors Colomer   +9 more
wiley   +1 more source

Orthopyroxene-dominated upper mantle melting built the early crust of the Moon

Communications Earth & Environment
The paradigm of lunar crust formation has been widely applied to other terrestrial bodies, but the nature of early crust building on the Moon remains enigmatic.
Si-Zhang Sheng, Bin Su, Shui-Jiong Wang, Yi Chen, Qiu-Li Li, Hao Wang, Hejiu Hui, Shitou Wu, Bo Zhang, Jiang-Yan Yuan   +9 more
doaj   +1 more source

Geochemical Constraints on the Structure of the Earth's Deep Mantle and the Origin of the LLSVPs

Geochemistry, Geophysics, Geosystems, 2021
Geophysical analysis of the Earth's lower mantle has revealed the presence of two superstructures characterized by low shear wave velocities on the core‐mantle boundary.
Matthew Gleeson, Caroline Soderman, Simon Matthews, Sanne Cottaar, Sally Gibson   +4 more
doaj   +1 more source

Dispersal, source and glass chemistry of a third tephra unit within Iceland's Settlement Layer

Boreas, EarlyView.
Tephra layers may be studied to understand the dynamics and sequence of past explosive volcanism. In Iceland, the distinctive Settlement Layer (AD ~877) underlies almost all archaeological evidence for the Norse Settlement and is preserved in soils across Iceland and as cryptotephra overseas.
Conner A. G. Morison, GuÐrún Larsen, Anthony J. Newton, Andrew J. Dugmore   +3 more
wiley   +1 more source

(Ultra)high‐Pressure Metamorphism in Sedimentary Versus Basaltic Rocks: Insights From a Variscan Mélange in the South Carpathians

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Reconstructing the pressure–temperature–time (P–T–t) evolution of (ultra)high‐pressure rocks is essential for constraining subduction and collisional dynamics. Subduction zones are often investigated using basic eclogites, whereas nonbasic high‐pressure rocks remain comparatively understudied, potentially hindering a comprehensive ...
Otavio S. G. Silva, Bruno V. Ribeiro, Gavril Săbău, Fabricio Caxito, Paulo A. de Paiva‐Silva, Pierre Lanari, George Luvizotto, Mahyra Tedeschi   +7 more
wiley   +1 more source

A universal concept for melting in mantle upwellings

Nature
Deep mantle melting marks the onset of Earth differentiation1, yet a unifying framework for how buoyancy-driven mantle upwellings initiate melting and how such incipient melts evolve within the asthenosphere has remained elusive. Here we show that the first melts generated in any solid-state mantle upwelling are kimberlitic CO₂-rich silicate melts that
Max W. Schmidt, Nadia Paneva, Andrea Giuliani   +2 more
openaire   +3 more sources

Metamorphic Reactivity Influences Amphibole Creep Behaviour

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rheological behaviour of solid‐solution minerals may play an important role in determining how metamorphic crust accommodates deformation. Whether or not a mineral's deformation is diffusion or dislocation‐mediated depends on a range of extrinsic variables such as stress, strain rate and temperature, as well as intrinsic variables such as ...
Alix Osinchuk, Brendan V. Dyck, Jesse B. Walters   +2 more
wiley   +1 more source

From the Bottom Up: Calculating Mantle‐Derived Magma Flux Using Subduction Parameters and Petrologic Constraints at Oceanic Arcs

Geochemistry, Geophysics, Geosystems
Mantle‐derived magma flux has a first‐order control on long‐term volcanic productivity, volatile cycling, and crustal growth in convergent margins. However, the factors controlling it remain unclear.
A. E. Goltz, C. B. Till, A. J. R. Kent
doaj   +1 more source