Results 21 to 30 of about 535 (200)

A Reassessment of Petrochemistry of ~1.2 Ga Tonalitic Rocks of the Northern Tugela Terrane, Natal Metamorphic Belt, South Africa: Further Constraints on the Evolution of This Belt

Geological Journal, EarlyView.
Our petrochemical studies on ~1.2 Ga granitoids of the Natal Metamorphic Belt, South Africa, do not suggest any property similar to Phanerozoic‐style subduction‐related granitoids. Plot of Kotongweni Tonalite in Y versus Sr diagram (after Moyen 2011), note that most samples have Sr/Y < 50.
Palesa Leuta, Saumitra Misra, Thembiso O. Basupi   +2 more
wiley   +1 more source

Apatite in Carbonatite Preserving Primary Magmatic, Post‐Magmatic Overgrowth, and Post India‐Asia Collision‐Related Hydrothermal Alteration: Evidenced From U–Pb Isotope and Trace Element Geochemistry

Geological Journal, EarlyView.
U–Pb isotope and trace element geochemistry of apatite from carbonatites of Peshawar Plain Alkaline Igneous Province, western Himalaya shows Permo‐Carboniferous magmatism, an additional magmatic pulse during Cretaceous, and post‐magmatic hydrothermal/metasomatism during Oligocene. ABSTRACT U–Pb isotope and trace element geochemistry of apatite combined
Mehboob ur Rashid, Hafiz U. Rehman, Hao‐Yang Lee, Sun‐Lin Chung, Kaushik Das, Kazumasa Aoki, Muhammad Jawad Zeb, Nasir Ahmad, Muhammad Hussain, Hiroshi Yamamoto   +9 more
wiley   +1 more source

An investigation of the 27 July 2018 bolide and meteorite fall over Benenitra, southwestern Madagascar

South African Journal of Science, 2021
Several dozen stones of an ordinary chondrite meteorite fell in and around the town of Benenitra in southwestern Madagascar during the early evening of 27 July 2018, minutes after a widely observed meteor fireball (bolide) transit and detonation.
Roger L. Gibson, Timothy Marais, Lewis D. Ashwal, Fenitra Andriampenomanana, Adriamiranto Raveloson, Andry H. Ramanatsoa, Matthias Laubenstein, Alexander Ziegler, Warrick C. Fuchsloch   +8 more
doaj   +1 more source

Artificial weathering of an ordinary chondrite: Recommendations for the curation of Antarctic meteorites

Meteoritics & Planetary Science, 2022
AbstractMeteorites are prone to errestrial weathering not only after their fall on the Earth’s surface but also during storage in museum collections. To study the susceptibility of this material to weathering, weathering experiments were carried out on polished sections of the H5 chondrite Asuka 10177.
Matthias van Ginneken, Vinciane Debaille, Sophie Decrée, Steven Goderis, Alan B. Woodland, Penelope Wozniakiewicz, Marleen De Ceukelaire, Thierry Leduc, Philippe Claeys   +8 more
openaire   +2 more sources

Procurement of Senonian Flint for Bladelets Production at the Early PPNB Site of Nahal Zahal in the Northern Negev Established for the First Time Using Chemical Composition Analysis

Archaeometry, EarlyView.
ABSTRACT The hypotheses of Senonian flint to be a prime source of prehistoric “chalcedony” flint artefacts from the Negev Desert (Israel) was not investigated in detail thus far. By combining trace‐element profiling with statistical interpretation, ten flint items from Nahal Zahal, an Early Pre‐Pottery Neolithic B site in the northern Negev, were ...
Meir Finkel, Michal Birkenfeld, Talia Abulafia, Keren Weiss‐Sarusi, Olga Berlin, Yoav Ben Dor   +5 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

The Nysa family as the main source of unequilibrated LL ordinary chondrites

Astronomy & Astrophysics
Context. The origin of the petrologic diversity observed in ordinary chondrites (OCs), the most common meteorites on Earth, remains debated. Competing models invoke either depth-dependent sampling of a single thermally stratified (‘onion-shell’) parent ...
Marsset M., Vernazza P., Brož M., Avdellidou C., Thomas C. A., McGraw L., Madden-Watson A., Minker K., Monnereau M., DeMeo F. E., Binzel R. P., Mahlke M., Carry B., Hanuš J., Simon P. N., Yang B., Beck P., Birlan M., Jehin E.   +18 more
doaj   +1 more source

Thermal histories of El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155): Implications for the diversity of IAB‐ungrouped iron meteorites and their parent bodies

Meteoritics &Planetary Science, EarlyView.
Abstract This study provides the first petrographic, crystallographic, and chemical comparison between El Médano 300 (EM 300) and Northwest Africa 8155 (NWA 8155), two particular IAB‐ungrouped iron meteorites. Both contain exceptionally large graphite nodules and “flowers”, providing unique insights into carbon behavior in metallic melts and cooling ...
L. Perez, M. Roskosz, F. Danoix, L. Kern, V. Megevand, C. Brillatz, B. Devouard, J. Gattacceca, M. Gounelle   +8 more
wiley   +1 more source

Size Constraints for the Pre-atmospheric Parent Bodies of Ordinary Chondrites

The Planetary Science Journal
The study of S-complex near-Earth objects (NEOs), the parent bodies of ordinary chondrites, has shown that they are dominated by asteroids with LL chondrite-like compositions. This is surprising because among the three subtypes of ordinary chondrites (H,
Juan A. Sanchez, David C. Cantillo, Adam Battle, Miren Miranda, Benjamin N. L. Sharkey, Tanner S. Campbell, Rogerio Deienno, William F. Bottke, David Nesvorný, Vishnu Reddy   +9 more
doaj   +1 more source

Abundances of Ordinary Chondrites in Thermally Evolving Planetesimals [PDF]

The Astrophysical Journal, 2018
Abstract Chondrites are some of the most primitive objects in the solar system, and they maintain a record of the degree of thermal metamorphism experienced in their parent bodies. This thermal history can be classified by the petrologic type.
Shigeru Wakita, Yasuhiro Hasegawa, Takaya Nozawa   +2 more
openaire   +2 more sources