Results 51 to 60 of about 7,496 (223)

Complex examination of the Upper Paleozoic siliciclastic rocks from southern Transdanubia, SW Hungary—Mineralogical, petrographic, and geochemical study [PDF]

, 2007
A vertical section of Upper Paleozoic sandstones from southern Transdanubia (Mecsek-Villány area, Tisza mega-unit, Hungary) has been analyzed for major and trace elements, including rare earth elements (REEs).
Á, Arribas, Awdankiewicz, Balogh, Bauluz, Bhatia, Bhatia, Biscaye, Brü, Cox, Csontos, Csontos, Csontos, Cullers, Cullers, Fazekas, Fedo, Gaillardet, Garver, Golonka, Haas, Huang, Kü, Lee, Nagy, Nesbitt, Noda, Pearce, Preston, Varga, Varga, Varga, Varga, Watanabe, Willan, Zimmermann   +35 more
core   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

Electron Microprobe Chemical Dating of Uraninite as a Reconnaissance Tool for Leucogranite Geochronology [PDF]

, 2007
We suggest that electron microprobe techniques may be employed to date Tertiary samples of uraninite (UO~2~), which can contain very high concentrations of radiogenic Pb after only a few million of years of U and Th decay. Although uraninite is regarded
Jahandar Ramezani, Jose M. Hurtado, Kip V. Hodges, Nilanjan Chatterjee, Samuel A. Bowring   +4 more
core   +1 more source

Thermal, mechanical and chemical properties of sintered monazite-(La, Ce, Nd or Sm).

Mineralogical Journal, 1997
Monazite powder, prepared by heating rhabdophane-(La, Ce, Nd or Sm) at 600°C for 2 hours in air, was dry-pressed to disks and bars. The disks and bars of monazite could be sintered to the relative density (100·bulk density/true density) of larger than 99 % at 1200°C in air without cracking.
Yasuo HIKICHI, Toshitaka OTA, Tomotoshi HATTORI   +2 more
openaire   +2 more sources

Vertical profiling of shock attenuation at the Rochechouart impact structure, France

Meteoritics &Planetary Science, EarlyView.
Abstract Rochechouart, south‐west France, is a complex impact structure. Here, we present the first report of shock barometry of quartz from what are likely parautochthonous basement units at depth, based on samples from the 2017 C.I.R.I.R drilling campaign. The crystallographic orientations of 725 sets of PDFs in 512 quartz grains in samples from four
P. Struzynska, S. Alwmark, C. Alwmark, M. H. Poelchau, P. Lambert   +4 more
wiley   +1 more source

Th-U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany [PDF]

, 2014
Monazite from the Stolpen monzogranite (SE Germany) was studied to constrain the Th-U-total Pb age of pluton formation. Monazite grains demonstrate subtle to distinct patchy zoning related to slight compositional variations.
Budzyń, Bartosz, Lisowiec, Katarzyna, Renno, Axel D., Schulz, Bernhard, Słaby, Ewa   +4 more
core   +1 more source

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

Solid-State Synthesis of Monazite-type Compounds Containing Tetravalent Elements [PDF]

, 2007
International audienceOn the basis of optimized grinding/heating cycles developed for several phosphate-based ceramics, the preparation of brabantite and then monazite/brabantite solid solutions loaded with tetravalent thorium, uranium, and cerium (as a ...
Audubert, F., Bernache-Assollant, Didier, Bregiroux, Damien, Dacheux, Nicolas, Podor, Renaud, Serin, Virginie, Terra, Olivier   +6 more
core   +5 more sources

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

Caracterização mineralógica, geoquímica e potencial econômico de ocorrências de terras raras do maciço granítico Serra do Mendes, Goiás [PDF]

, 2017
Dissertação (mestrado)—Universidade de Brasília, Instituto de Geociências, Programa de Pós-Graduação em Geologia, 2017.O Maciço Granítico Serra do Mendes (MGSM) está localizado na Província Estanífera de Goiás (PEG), que é caracterizada por corpos de ...
Zapata Montoya, Angélica María
core   +1 more source