Results 141 to 150 of about 222,262 (199)

Uranium Isotope Evidence for Persistent Global Ocean Anoxia Across the Ediacaran–Cambrian Transition in Siberia

Geobiology, Volume 24, Issue 5, September/October 2026.
ABSTRACT The enigmatic Ediacara biota represents Earth's earliest example of macroscopic, complex life, yet the driving forces promoting their mid‐Ediacaran evolution and subsequent extinction across the Ediacaran–Cambrian boundary remain speculative. If these were true animals requiring oxygen for aerobic respiration, their rise has often been linked ...
Andrew D. Doerrler, Tian Gan, Geoffrey J. Gilleaudeau, Matthew G. Pedersen, Natalia Bykova, Vasiliy Marusin, Natalia A. Ivanova, Boris Kochnev, Dimitriy V. Grazhdankin, Karel Kletetschka, Alan J. Kaufman   +10 more
wiley   +1 more source

Geophysical update of the diameter of the Zhamanshin impact structure, Kazakhstan

Meteoritics &Planetary Science, Volume 61, Issue 9, Page 2284-2302, September 2026.
Abstract The rim of the 0.9‐Ma‐old Zhamanshin impact crater in Kazakhstan is considered to be almost completely exposed via a series of hills surrounding a central flat area, indicating an apparent diameter of 14 km. This would make Zhamanshin the second largest impact crater of the Quaternary period. However, the overall geometry of these hills is not
Yoann Quesnel, Dilyara M. Kuzina, Jérôme Gattacceca, Minoru Uehara, Ayrat G. Kharisov, Dmitry D. Badyukov, Pierre Rochette   +6 more
wiley   +1 more source

Gold quartz veins of the Alleghany district, California [PDF]

Professional Paper, 1932
H. G. Ferguson, R. W. Gannett
openaire   +1 more source

The nature and significance of illite associated with quartz-hematite hydrothermal veins in the St. Austell pluton, Cornwall, England

Quartz-hematite veins in the St. Austell pluton feature an assemblage of authigenic kaolin, illite, chlorite and hematite. Similar assemblages occur in altered granites adjacent to the veins.
Psyrillos A, Manning DAC, Burley S
core   +1 more source

Quartz-carbonate vein gold

, 1995
openaire   +1 more source

Conditions of quartz veins formation on the quartz hill site (Yakutia)

, 2021
openaire   +1 more source

Laumontite veins in Quartz Diorite in the Tanzawa Mauntains

The Journal of the Geological Society of Japan, 1960
openaire   +2 more sources

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Thermoluminescence spectra of igneous quartz and hydrothermal vein quartz

Physics and Chemistry of Minerals, 1993
Variations in thermoluminescence spectra are reported for four types of geological quartz examined with a new spectrometer featuring dual imaging photon detectors that separately and simultaneously detect (1) uv-blue (200–450 nm) and (2) blue to near infrared (400–800 nm) emission.
W.J. Rink, H. Rendell, E.A. Marseglia, B.J. Luff, P.D. Townsend   +4 more
openaire   +1 more source

THE GENESIS OF KYANITE IN QUARTZ VEINS

International Geology Review, 1961
The article deals with a new vein deposit of kyanite in Bulgaria and some considerations concerning the origin of kyanite veins in general. The kyanite is found in quartz veins within garnetiferous staurolite schists of probable Jurassic age. The kyanite crystals are up to ten centimeters long along the c-axis and form parallel rodlike aggregates ...
openaire   +1 more source

Dislocations and Bubbles in Vein Quartz

Nature Physical Science, 1973
TWO types of quartz veins occur in the former goldfield area at Ballarat, Victoria; one is potentially gold bearing and the other had always been barren. The former (type B1 veins) which go deep into the crust are hydrothermal veins or quartz dykes associated with local granites.
openaire   +1 more source