Results 111 to 120 of about 11,238 (241)
Short duration thermal metamorphism in CR chondrites
, 2013 International audienceCR chondrites are considered as one of the most primitive classes of meteorites. Most of them experienced a mild aqueous alteration and show no evidence of significant effect of thermal metamorphism. We present here a search for low
Montagnac, G. +10 more
core +1 more source
Fe-Ni Sulphides as Indicators of Alteration in CM Chondrites [PDF]
, 2007 This study looks at the sulphide abundance and composition of Fe-Ni sulphide grains in 12 CM chondrites to determine an alteration sequence for these ...
Bullock, E. S. +3 more
core +2 more sources
Chondrule Destruction via Dust Collisions in Shock Waves
The Astrophysical JournalA leading candidate for the heating source of chondrules and igneous rims is shock waves. This mechanism generates high relative velocities between chondrules and dust particles.
Yuji Matsumoto +2 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.Abstract Whether the Songduo metamorphic belt represents an in situ Paleo‐Tethyan suture within the Lhasa Terrane or far‐traveled allochthonous high‐pressure slices, and how Permian mantle activity along the North Gondwana margin relates to subsequent Tethyan evolution, remain central questions in Tibetan tectonics.
Yuan‐Bo Ma +9 more
wiley +1 more source
Apatite as a Proxy for Reconstructing Magma Mixing Histories in Granitoids
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.Abstract Apatite is a common accessory mineral in granites and mafic microgranular enclaves (MMEs), and its textural and compositional characteristics can record dynamic magmatic evolution processes. Apatites from the Early Cretaceous Sanguliu granite and its MMEs in the Liaodong Peninsula exhibit pronounced compositional heterogeneities. In this study,
Xiaowen Lin, Jiahao Zheng, Wanyi Feng
wiley +1 more source
Young Pb-Isotopic Ages of Chondrules in CB Carbonaceous Chondrites
, 2005 CB (Bencubbin-type) carbonaceous chondrites differ in many ways from more familiar CV and CO carbonaceous chondrites and from ordinary chondrites. CB chondrites are very rich in Fe-Ni metal (50-70 vol%) and contain magnesian silicates mainly as angular ...
Amelin, Yuri, Krot, Alexander N.
core
Petrology of Amoeboid Olivine Aggregates in Antarctic CR Chondrites: Comparison With Other Carbonaceous Chondrites [PDF]
, 2016 Amoeboid olivine aggregates (AOAs) are important refractory components of carbonaceous chondrites and have been interpreted to represent solar nebular condensates that experienced high-temperature annealing, but largely escaped melting.
Komatsu, M. +5 more
core
Mössbauer Study of Weathered H-meteorite from the Desert of Oman
Sultan Qaboos University Journal for ScienceA number of meteorites from the desert of Oman, classified as H-chondrites, with known and unknown ages, were studied by using 57Fe Mössbauer spectroscopy to determine their Fe3+-bearing compositions.
Ahmed D. Al-Rawas +7 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.Abstract Distributed basaltic volcanic fields commonly host minor but significant silicic magmas, the origin of which remains debated. At Harrat Khaybar (western Saudi Arabia; ca. 1.7 Ma to present), volcanic activity erupted compositions range from alkali olivine basalt to trachyte and comendite.
Abdullah Alohali +5 more
wiley +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.Abstract The nature of mantle sections exhumed at magma‐poor rifted margins remains poorly constrained, largely because direct sampling of mantle in modern passive margins is exceptionally rare. The Iberia–Newfoundland system is unique in providing drilled mantle rocks on both conjugate margins, offering an unprecedented glimpse into mantle ...
A. Secchiari, M. Godard, A. Montanini
wiley +1 more source