Results 101 to 110 of about 25,421 (273)
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 +9 more
wiley +1 more source
Olivine-chrome-spinel equilibrium in chromitites and ultramafites of Rai-Iz massif, Polar Urals
Литосфера, 2016 Olivine and chrome-spinel compositions from chromitites and ore-bearing metamorphosed ultramafic rocks of Rai-Iz massif were compared. It was established that olivine and spinel ferruginosity are directly proportional and increase monotonically from ...
P. B. Shirjaev, N. V. Vakhrusheva
doaj +2 more sources
Geochemistry, Geophysics, GeosystemsMeasurements of surface heat flux from boreholes of the NIED Hi‐net network of seismometers are used to determine temperature and shear stress on the plate interface beneath northern Honshu.
Philip England +2 more
doaj +1 more source
Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure
Meteoritics &Planetary Science, EarlyView.Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark +8 more
wiley +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract The framework of the Impact Cratering Committee (ICC) of the Meteoritical Society was approved in 2020, with the first committee members appointed in 2023. The ICC has a mandate to (1) approve, maintain, and update a database of confirmed terrestrial meteorite impact structures, (2) define and regularly update the criteria used for ...
A. J. Cavosie +11 more
wiley +1 more source
The geological evolution of the eastern Richtersveld
, 1978 Includes bibliographical references.The lithology of the early Proterozoic (-1950-1750 my) Richtersveld is characterised by predominantly calc-alkaline volcanics, (De Hoop Subgroup) overlain by and intercalated with quartzitic metasediments into which ...
Ritter, Ulrich
core
Meteoritics &Planetary Science, EarlyView.Abstract This study documents micro‐ to nanoscale observations of primary nebular and secondary parent body iron sulfides in the CR1 GRO 95577. Despite the extensive alteration of the bulk sample, some primary sulfides managed to avoid alteration, having originally formed in the solar nebula during chondrule formation by either fission‐sulfidization or
S. A. Singerling
wiley +1 more source
Литосфера, 2016 For the first time detailed mineralogical research of the Permo-Triassic basalt core samples of Yen-Yakhinskaya superdeep hole SG-7 from the depths of 7673 m, 8009 m and 8250 m was carried. The composition of minerals investigated.
S. V. Berzin +2 more
doaj
PETROLOGICAL STUDY OF METAPELITIC GRAPHITIC SCHISTS FROM THE SOUTHWESTERN TAUERN WINDOW (EASTERN ALPS) [PDF]
openIn the past, several studies aimed to investigate and analyze the Alpine metamorphism of rocks outcropping in the southwestern corner of the penninic Tauern Window.
BEDON, SIMONE
core
Sedimentology, EarlyView.ABSTRACT The Paleoarchean Antarctic Creek Member of the Mount Ada Basalt, Eastern Pilbara Terrane, Western Australia, includes beds of jasper and white chert composed of sand‐sized silica granules that often contain or are mixed with silt‐sized particles of haematite.
Donald R. Lowe, Gary R. Byerly
wiley +1 more source