Results 111 to 120 of about 59,128 (262)

Degassing history of water, sulfur, and carbon in submarine lavas from Kilauea volcano, Hawaii [PDF]

, 1991
Major, minor, and dissolved volatile element concentrations were measured in tholeiitic glasses from the submarine portion (Puna Ridge) of the east rift zone of Kilauea Volcano, Hawaii.
Clague, David A., Dixon, Jacqueline Eaby, Stolper, Edward M.   +2 more
core   +1 more source

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
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

Polymict melt‐bearing breccia dikes in the Morokweng impact structure formed by slip‐induced mechanical mixing of pseudotachylite and cataclasite along large‐displacement impact faults

Meteoritics &Planetary Science, EarlyView.
Abstract A core drilled through shocked and faulted Archean granitoid gneisses and dolerites in the eroded peak ring of the 70–80 km diameter Morokweng impact structure intersects multiple centimeter‐ to meter‐wide clastic‐matrix breccias containing a polymict clast population of lithic and mineral clasts and altered, millimeter‐ to centimeter ‐size ...
Roger L. Gibson, S'lindile S. Wela, Leonidas C. Vonopartis, Marco A. G. Andreoli   +3 more
wiley   +1 more source

Congo River sand and the equatorial quartz factory [PDF]

, 2019
A never solved problem in sedimentary petrology is the origin of sandstone consisting exclusively of quartz and most durable heavy minerals. The Congo River offers an excellent test case to investigate under which tectonic, geomorphological, climatic ...
Andò, Sergio, Baudet, Daniel, Botti, Eleonora, De Grave, Johan, Dinis, Pedro, Garzanti, Eduardo, Hahn, Annette, Limonta, Mara, Vermeesch, Pieter, Vezzoli, Giovanni, Yaya, Nicole Kitambala   +10 more
core   +1 more source

Confirming the impact origin of the São Miguel do Tapuio structure, northeastern Brazil

Meteoritics &Planetary Science, EarlyView.
Abstract The São Miguel do Tapuio structure (SMT) is a remarkable, nearcircular feature of about 21 km diameter, centered at 5°37.6′ S, 41°23.3′ W in Piauí state, northeastern Brazil. The structure is located within the sedimentary strata of the Paleozoic–Mesozoic Parnaíba Basin and predominantly comprises sandstones of the Devonian Pimenteiras and ...
Alvaro Penteado Crósta, Neivaldo Araújo de Castro, Marcos Alberto Rodrigues Vasconcelos, Airton Natanael Coelho Dias, Ludovic Ferrière, Wolf Uwe Reimold, Ana Maria Góes, Jackson Alves Martins, Liliana Sayuri Osako, Raimundo Mariano Gomes Castelo Branco   +9 more
wiley   +1 more source

The effect of terrestrial weathering on the mineralogy and petrologic (sub)types of CM chondrites explored by kinetic modeling and laboratory experiments

Meteoritics &Planetary Science, EarlyView.
Abstract Terrestrial weathering alters the chemical and isotopic composition, and mineralogy, of meteorites; its effects on ordinary chondrites are well‐studied, but relatively little is known about the susceptibility of carbonaceous chondrites. We combined laboratory experiments, whereby Chwichiya 002 (C3‐ung find), Murchison (CM2 fall) and Kolang ...
Robin L. Haller, Martin R. Lee, Mark E. Hodson   +2 more
wiley   +1 more source

Climate conditions on the South‐Iberian Palaeomargin during the latest Pliensbachian to early Toarcian: A mineralogical and geochemical study from hemipelagic deposits

Sedimentology, EarlyView.
ABSTRACT The integrated analysis of lithofacies, mineralogy and geochemistry of the hemipelagic marine succession exposed in La Cerradura section (South‐Iberian Palaeomargin) provides new information to characterise the palaeoenvironmental conditions during the latest Pliensbachian to early Toarcian, including the Jenkyns Event.
Chaima Ayadi, Isabel Abad, Elisa Laita, Ali Mokhtar Samet, Matías Reolid   +4 more
wiley   +1 more source

Effect of Re-impacting Debris on the Solidification of the Lunar Magma Ocean

, 2018
Anorthosites that comprise the bulk of the lunar crust are believed to have formed during solidification of a Lunar Magma Ocean (LMO) in which these rocks would have floated to the surface.
Abe, Alibert, Andrews-Hanna, Asphaug, Bandermann, Barnes, Barr, Borg, Borg, Borg, Bottinga, Boyce, Boyce, Boyet, Breuer, Cameron, Canup, Canup, Chambers, Chen, Cox, Cuk, Cuk, Daly, Dohnanyi, Elkins-Tanton, Elkins-Tanton, Elkins-Tanton, Eppelbaum, Gaffney, Gast, Hartmann, Ida, Jackson, Jackson, Kato, Kaula, Kirk, Kokubo, Kokubo, Konrad, Leinhardt, Lin, Lin, Longhi, Longhi, Luhmann, Marcus, Mastrobuono-Battisti, Matson, Matsuyama, McCubbin, McLeod, Melosh, Merk, Meyer, Minear, Monteux, Nemchin, Neumann, Niemela, Nyquist, Nyquist, O'Hara, O'Neill, Ogawa, Pahlevan, Pepin, Philpotts, Piskorz, Pritchard, Rankenburg, Ransford, Rathbun, Repetto, Reufer, Riner, Rolf, Rufu, Ryder, Saal, Salmon, Senshu, Sharp, Shirley, Snyder, Solomon, Solomon, Solomon, Spera, Spicuzza, Squyres, Takeda, Tanaka, Taylor, Taylor, Taylor, Taylor, Tian, Touboul, Touboul, Touma, Touma, Turcotte, Vander Kaaden, Wakita, Walker, Walker, Warner, Warren, Warren, Wieczorek, Williams, Wolf, Wood, Wood, Wyatt, Yamamoto, Yamamoto, Zhang, Zhang   +120 more
core   +1 more source

Mid‐infrared spectroscopy applied to a multi‐level cave system (Montmaurin, SW France): An innovative method for assessing sediment provenance

Sedimentology, EarlyView.
ABSTRACT Deciphering sediment provenance is essential to understand depositional patterns and dynamics. This question is particularly important in archaeological contexts to constrain the sedimentological history of unearthed material—an information critically needed, for example, to estimate the age of the deposits—or to apprehend sediment movement ...
Fuchs Coraline, Rambeau Claire, Ertlen Damien, Rixhon Gilles, Perrenoud Christian, Ponche Jean‐Luc, Trautmann Martine, Benarioumlil Sylvain, Vialet Amélie   +8 more
wiley   +1 more source