Results 91 to 100 of about 379,430 (254)

Oxygen isotope variability in the IIIAB iron meteorites and their relationship to main group pallasites

Meteoritics &Planetary Science, EarlyView.
Abstract The light element distribution in planetary cores and the processes driving core evolution in rocky planets are poorly understood. Magmatic iron meteorites are samples from the cores of ancient embryonic planetesimals and therefore provide a window into the processes governing core evolution. We performed high precision oxygen isotope analyses
R. J. Windmill, I. A. Franchi, X. Zhao, R. C. Greenwood, M. Anand   +4 more
wiley   +1 more source

The continental record and the generation of continental crust [PDF]

, 2012
Continental crust is the archive of Earth history. The spatial and temporal distribution of Earth's record of rock units and events is heterogeneous; for example, ages of igneous crystallization, metamorphism, continental margins, mineralization, and ...
Hawkesworth, Chris, Cawood, Peter Anthony, Hawkesworth, C. J., Dhuime, B., P.A. Cawood, Dhuime, Bruno Philippe Marcel, Cawood, P. A., C.J. Hawkesworth, B. Dhuime   +8 more
core   +1 more source

Crystallization of dmisteinbergite (hexagonal CaAl2Si2O8) from type B CAI analog melt

Meteoritics &Planetary Science, EarlyView.
Abstract Dmisteinbergite is a metastable polymorph of CaAl2Si2O8, which has been found in calcium−aluminum‐rich inclusions (CAIs) in chondrites, although anorthite is the predominant CaAl2Si2O8 phase in natural type B CAIs. The occurrence/absence of igneous dmisteinbergite would put tighter constraints on the thermal history of CAIs.
Yasuaki Tsuruoka, Hideto Yoshida, Yuki Inoue, Daiki Yamamoto, Hiroyuki Kagi, Akira Miyake, Shogo Tachibana   +6 more
wiley   +1 more source

A seismological study of the mantle beneath Iceland [PDF]

, 2000
Iceland has long been thought to be underlain by a thermal upwelling, or plume, rising from deep within the mantle. This study tests this hypothesis, by a) seeking evidence for a plume in the lower mantle in azimuth anomalies at the NORSAR array and b ...
Pritchard, Matthew James, Pritchard, M.J.   +1 more
core  

Mantle structure and tectonic history of SE Asia [PDF]

, 2015
Seismic travel-time tomography of the mantle under SE Asia reveals patterns of subduction-related seismic P-wave velocity anomalies that are of great value in helping to understand the region's tectonic development.
Wim Spakman, Mantle dynamics & theoretical geophysics, Hall, Robert, Spakman, Wim, Robert Hall   +4 more
core   +2 more sources

Characterization of coesite‐bearing impact melt glass from the Hapcheon crater, Korea: Trimodal phase architecture, shock metamorphism, and implications for 40Ar/39Ar geochronology

Meteoritics &Planetary Science, EarlyView.
Abstract We present the first micrometer‐scale, phase‐resolved compositional characterization of impact melt glass from the Hapcheon crater (~1.4 km apparent diameter), the first confirmed impact structure on the Korean Peninsula, integrating EPMA‐WDS (5 μm spot), confocal Raman spectroscopy (<1 μm spot), XRD, and 40Ar/39Ar step‐heating geochronology ...
Jin‐Young Lee, Jeongmin Kim, Sei‐Sun Hong   +2 more
wiley   +1 more source

The tectonic evolution of mantle rocks from the lizardophiolite complex, South-West England [PDF]

, 1999
In SW England, a highly deformed and metamorphosed assemblage of ultramafic, mafic and granitic rocks is interpreted to represent a fragment of upper mantle and lower oceanic crust: the Lizard Ophiolite Complex.
Cook, Charles Andrew
core  

The effective elastic thickness of the India Plate from receiver function imaging, gravity anomalies and thermomechanical modelling [PDF]

, 2006
The range and the meaning of the effective elastic thickness (EET) in continental areas have been subject to controversy over the last two decades. Here we take advantage of the new data set from the Hi-CLIMB seismological experiment to re-estimate the ...
Cattin, R., Nabelek, J. L., Hetényi, György, Vergne, J.   +3 more
core   +1 more source

Ecological and genomic variation in ectomycorrhizal fungal exploration types

New Phytologist, EarlyView.
Summary Ectomycorrhizal fungi (EMF) produce mycelia with variable extension and complexity, which can be classified according to soil ‘exploration types’ (ETs). ETs have received attention as one of the few mycorrhizal trait frameworks, but without an empirical classification of ET functional diversity and environmental preferences, understanding and ...
Thomas M. Mansfield, Artin Zarsav, Filipa Cox, Laura M. Suz, Martin I. Bidartondo, Sietse van der Linde, Nadia Barsoum, Colin Averill, Alan Kuo, Leho Tedersoo, Pasi Rautio, Arthur Gessler, Bruno De Vos, Luc Croisé, Henning Meesenburg, Markus Wagner, Frank Jacob, Paweł Lech, Anna Kowalska, Martin Greve, Genoveva Popova, Beat Frey, Marcus Schaub, Marco Ferretti, Peter Waldner, Vicent Calatayud, Roberto Canullo, Giancarlo Papitto, Aleksander Marinšek, Lars Vesterdal, Morten Ingerslev, Helge Meissner, Volkmar Timmermann, Nadine Eickenscheidt, Andreas Schmitz, Francis M. Martin, Joseph Spatafora, Peter G. Kennedy, Annegret Kohler, Jonathan M. Plett, Ian C. Anderson, Sara Branco, Igor V. Grigoriev, Chris J. Pires, Sarah A. Unruh, Lawrence W. Zettler, Otto Miettinen, Ilya Viner, Tom W. May, Teresa Lebel, David E. A. Catcheside, Pamela S. Catcheside, Helen P. Vonow, Leigh A. Burgoyne, Julia Haska, Mark A. Anthony   +55 more
wiley   +1 more source

Geophysical Investigations of the Structure and Tectonics of Southern California [PDF]

, 1978
Regional variations in the crustal structure of southern California are defined by travel-time data from natural and artificial events. We show that the crust of the Mojave, northeastern Peninsular Ranges, eastern Transverse Ranges and Colorado Desert ...
Hadley, David Milton
core   +1 more source