Results 81 to 90 of about 20,638 (213)

K9Y3[Si12O32]F2

Acta Crystallographica Section E, 2014
Single-crystals of the title compound, nonapotassium triyttrium dodecasilicate difluoride, were obtained from flux synthesis experiments in the system SiO2—Y2O3—KF.
Volker Kahlenberg, Tanja Manninger
doaj   +1 more source

Xenoliths in meteorites: Insights into the dynamics of material exchange between asteroids

Meteoritics &Planetary Science, EarlyView.
Abstract A minor fraction of meteorites contains xenoliths, that is, clasts that were formed on a different parent body than that of the host lithology. The occurrence of xenoliths is direct evidence for the exchange of material between asteroids, including exchanges between asteroids from the carbonaceous (CC) and non‐carbonaceous (NC) reservoirs ...
J. Gattacceca, B. Devouard, L. Bonal, Y. Marrocchi, A. Greshake, R. Tartèse, M. Gounelle, D. AuYang, C. Sonzogni, M. Hutson, A. Irving, C. Agee, T. Shisseh, A. Love, V. Vidal, D. Borschneck, S. A. Eckley, A. Morbidelli   +17 more
wiley   +1 more source

(Table 1B) Stable isotope composition, petrography and epoch at DSDP Site 93-603

, 1987
(Table 1B) Stable isotope composition, petrography and epoch at DSDP Site 93 ...
Reiner Botz (6963686), Ulrich von Rad (6886787), von Rad, Ulrich, Botz, Reiner   +3 more
core   +1 more source

Thermal history of an amoeboid olivine aggregate in the early solar nebula

Meteoritics &Planetary Science, EarlyView.
Abstract Carbonaceous chondrites commonly contain amoeboid olivine aggregates (AOAs). Here, we investigated an AOA in the CR chondrite Y‐793261. This AOA contains an unstable assemblage of forsterite and quartz. We found a rare occurrence of enstatite and quantitatively discuss its formation process.
M. Kimura, N. Imae, M. Komatsu, A. Yamaguchi   +3 more
wiley   +1 more source

Petrography class expedition on the Gunpowder River

, 1923
Caption: Expedition on the Gunpowder River, near Baltimore, taken by the Class in Petrography, headed by Dr. Mathews.

core   +1 more source

Peculiarities of formation, isomorphism and geochemistry of trace elements of sphalerite and wurtzite unusual varieties from the Goniatite occurrence (Pai-Khoi Ridge, Nenets Autonomous District)

Записки Горного института
A unique Mn-, Cd-bearing sphalerite from quartz-calcite veins in the coal-bearing series (Visean C1v) marine sediments in a 50 km segment of the middle course of the Silova-Yakha River in the Arctic zone of the European part of Russia (Pai-Khoi Ridge ...
Aleksandr B. Makeyev, Ilya V. Vikentyev, Elena V. Kovalchuk, Vera D. Abramova, Vsevolod Yu. Prokofyev   +4 more
doaj  

The Polymetallic Deposits of the Western European Plate and Structure of the Earth's Crust According to GOCE Gravity Data

Russian Journal of Earth Sciences
For the first time, the results of modern studies of the earth's crust based on gravity data from the GOCE satellite Project are used for a comparative regional metallogenic analysis of the geodynamic settings of the formation of polymetallic deposits in
Galyamov A. L., Volkov A. V., Lobanov K. V.   +2 more
doaj   +1 more source

Conditions and timing for the precipitation of early marine diagenetic dolomite in the Triassic Dolomia Principale (northern Italy)

Sedimentology, EarlyView.
ABSTRACT Thermodynamic constraints and empirical evidence often suggest that fabric‐retentive replacement dolomites are stable carbonate minerals that preserve ancient seawater properties. This study evaluates this hypothesis by examining the Upper Triassic Dolomia Principale in Northern Italy.
Vivien Folliot, Giovanna Della Porta, Mathias Mueller, Fabrizio Berra, Benjamin F. Walter, Aratz Beranoaguirre, Sylvia Riechelmann, Oskar Schramm, Adrian Immenhauser   +8 more
wiley   +1 more source

(Table 1) Silicic units and petrography in ODP Hole 135-841B

, 1994
(Table 1) Silicic units and petrography in ODP Hole 135 ...
Schöps, Dietmar, Dietmar Schöps (7985009), Peter M Herzig (6967469), Herzig, Peter M   +3 more
core   +1 more source

Petrography [PDF]

The American Naturalist, 1897
  +8 more sources