Results 101 to 110 of about 62,454 (271)

Oceanic crust deep seismic survey

Eos, Transactions American Geophysical Union, 1992
In September 1991, the British Institutions Reflection Profiling Syndicate (BIRPS) collected 578 km of deep seismic reflection profiles over the oceanic crust beneath the Cape Verde abssyal plain in approximately 4900 m of water (Fig. 1). The survey, under the direction of J. H. McBride, was undertaken in response to a proposal made by R. S.
J. H. McBride, R. S. White
openaire   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Growth and Chemical Evolution of the Kohistan Arc Crust, Northern Pakistan, Western Himalayas

Geochemistry, Geophysics, Geosystems
Fossil arcs which expose the middle‐lower crust have the potential to shed light on active arc processes because magmatic rocks from the entire history of the arc can be examined.
Paul Sotiriou, Karsten M. Haase, Marcel Regelous   +2 more
doaj   +1 more source

Increased metamorphic conditions in the lower crust during oceanic transform fault evolution [PDF]

Solid Earth
Oceanic transform faults connect the segments of active spreading ridges that slide past each other. In a classical view, transform faults are considered conservative, where no material is added or destroyed.
P. Haas, P. Haas, M. F. H. Thomas, C. Heine, J. Ebbing, A. Seregin, J. van Itterbeeck   +6 more
doaj   +1 more source

A geophysical investigation of the Roter Kamm impact crater, Namibia

Meteoritics &Planetary Science, EarlyView.
Abstract The Roter Kamm impact crater is located in the southern Namib Desert. The crater has a diameter of 2.5 km and belongs to the category of simple, bowl‐shaped impact craters, with an elevated rim of fractured target rock. The crater's interior is completely buried beneath sediments, preventing extensive surface investigations of the bedrock ...
Hannah Nienhaus, Pritam Yogeshwar, Wiebke Mörbe, Bülent Tezkan, Yajun Liu, Bufelo Lushetile, Martin Melles   +6 more
wiley   +1 more source

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

EARTH CRUST IN OCEANS AND STRIP ANOMALIES OF MAGNETIC FIELD

Геологія і корисні копалини Світового океану, 2019
Examples of the isolation and interpretation of the strip anomalies of the magnetic field of the oceans are considered. Data were used on the eastern edge of the Pacific Ocean over most of the western coast of North America and on the Knipovich Ridge at ...
V.V. Gordienko
doaj   +1 more source

Mafic High‐Pressure Rocks Are Preferentially Exhumed From Warm Subduction Settings

Geochemistry, Geophysics, Geosystems, 2018
The oceanic crust that enters a subduction zone is generally recycled to great depth. In rare and punctuated episodes, however, blueschists and eclogites derived from subducted oceanic crust are exhumed.
Peter E. vanKeken, Ikuko Wada, Geoffrey A. Abers, Bradley R. Hacker, Kelin Wang   +4 more
doaj   +1 more source

Mechanism of crustal extension in the Laxmi Basin, Arabian Sea

Geodesy and Geodynamics, 2015
Continental rifting and magmatism has been extensively studied worldwide as it is believed that continental rifting, break up of continents and associated magmatism lead to genesis of new oceanic crust.
Anju Pandey, Dhananjai K Pandey
doaj   +1 more source

Geo-neutrinos and Earth's interior

, 2007
The deepest hole that has ever been dug is about 12 km deep. Geochemists analyze samples from the Earth's crust and from the top of the mantle. Seismology can reconstruct the density profile throughout all Earth, but not its composition. In this respect,
Fiorentini, Gianni, Lissia, Marcello, Mantovani, Fabio   +2 more
core   +1 more source