Results 81 to 90 of about 10,620 (270)

Ngarrawa (mound spring) sediments as archives of Holocene environmental change in arid central Australia: Insights from Itrax XRF scanning

Journal of Quaternary Science, EarlyView.
ABSTRACT Central Australia's ngarrawa, or ‘mound springs’, are unique hydrological systems that serve as some of the only near‐permanent sources of water and continuous sediment deposition in Australia's arid interior. As such, they hold significant potential as palaeo‐climate and ‐environmental archives in a region where many aspects of past climate ...
Fletcher C. Nixon, Jonathan J. Tyler, Patricia S. Gadd, Quan Hua   +3 more
wiley   +1 more source

(Table 3) Argon ratios and datings of tephra layer feldspars from ODP Hole 165-999A

, 2000
(Table 3) Argon ratios and datings of tephra layer feldspars from ODP Hole 165 ...
Bralower, Timothy J, Carey, Steven N, King, John W, Sigurdsson, Haraldur, Kelley, Simon P, Simon P Kelley (7910837), Timothy J Bralower (6886580), Haraldur Sigurdsson (586946), R Mark Leckie (6970949), John W King (6963935), Leckie, R Mark, Steven N Carey (7981130)   +11 more
core   +1 more source

Carbon isotope geochemistry of organic matter in volcanic paleosols constrains paleo‐environmental variations

Journal of Quaternary Science, EarlyView.
ABSTRACT The Fiorano quarry paleosol developed within the Colli Albani volcanic district (Italy) in the time interval bracketed by the deposition of the Pozzolanelle pyroclastic‐flow unit (365 ± 4 ka) and the emplacement of the Capo di Bove lava flow (277 ± 2 ka).
Eduardo Di Marcantonio, Luca Aldega, Luigi Dallai, Mario Gaeta, Fabrizio Marra   +4 more
wiley   +1 more source

Brecciation-related argon redistribution in alkali feldspars: An in naturo crushing study

, 2000
International audienceAlkali feldspar thermochronologic modeling with the 40Ar/39Ar method has generated marked advances in knowledge of the mechanisms for argon diffusion in feldspars.
Eide, Elizabeth, Arnaud, Nicolas, Olivier   +1 more
core   +5 more sources

Nanoscopic feldspar islands on K-feldspar microcline (001)

Physical Chemistry Chemical Physics
High-resolution atomic force microscopy on microcline (001) reveals nanoscopic islands, which have the same atomic structure as the terrace and are stable in contact with water. The islands were identified as an intrinsic feature of the surface.
Tobias Dickbreder, Franziska Sabath, Florian Schneider, Uwe Güth, Ralf Bechstein, Angelika Kühnle   +5 more
openaire   +3 more sources

New constraints on the postglacial evolution of Lago Maggiore, Northern Italy

Journal of Quaternary Science, EarlyView.
ABSTRACT Lago Maggiore is situated in an overdeepened valley reach at the southern margin of the European Alps, and its thick sediment infill allows the reconstruction of the postglacial valley and lake evolution. We study here the sedimentary succession in the lower Ossola Valley, which is infilled by ~500 m of deposits. In a marginal position, a core
Lukas Gegg, Alexander Fülling, Andrew Greenwood, György Hetényi, F. Martin Hofmann, Giovanni Monegato, Jahir S. Rangel Herrera, Camille Schirra, Marco Venier, Othmar Müntener   +9 more
wiley   +1 more source

Late Quaternary lake filling and drying in northern Australia's largest freshwater lake

Journal of Quaternary Science, EarlyView.
ABSTRACT Lake Woods, Jurrkulu, is northern Australia's largest freshwater lake filled today in strong Indo–Australian summer monsoons (IASM) to maximum depths of ~5 m. On the western margins of the lake, two large arcuate ridges occur 20 to 40 m above the lake floor and inset within these are other mid‐elevation lake deposits, such as depositional ...
Tim J. Cohen, Zenobia Jacobs, Caitlyn Scobie, Sam Marx, William Reynolds, Matthew S. Forbes, Haidee Cadd, Xue Rui, Laura Mogensen, Alexandru Codilean, Réka H. Fülöp, Klaus M. Wilcken, Fabian Boesl, Alex F. Wall, Nicola Stromsoe   +14 more
wiley   +1 more source

X-ray study of potassium feldspars from different granitoid types and gneisses of Papuk Mt. (Slavonia, Croatia)

Geologia Croatica, 2011
Potassium feldspars from different granitoids and gneisses of Papuk Mt. (Slavonia, Croatia) have been investigated by X-ray powder diffraction. Diffraction patterns classically observed as well as patterns calculated by Rietveld refinement were compared ...
Marija Horvat, Darko Tibljaš, György Buda, György Lovas   +3 more
doaj   +1 more source

Observations on the Feldspars [PDF]

The Journal of Geology, 1913
An interesting variation of the albite-microcline intergrowth known as perthite was noticed among some specimens obtained from a mineral dealer. The body of the specimen is pale flesh-red microcline. On the basal pinacoidal oio cleavage there are two intersecting sets of narrow, colorless albite strips, which are plates inserted parallel to the unit ...
openaire   +1 more source

Tilts and tetrahedra: The origin of the anisotropy of feldspars

, 2012
Following the ideas of Helen Megaw, we describe the changes in the conformation of the tetrahedral framework of feldspars in terms of just four distinct tilt systems of rigid tetrahedra. These systems are based on the four allowed tilts of a ring of four
R. J. Angel, TRIBAUDINO, Mario, L. M. Sochalski Kolbus   +2 more
core   +1 more source