Results 81 to 90 of about 116,871 (355)

Wetlands as environments of early human occupation: A new classification for freshwater palaeowetlands

The Depositional Record, EarlyView.
A new classification for inland freshwater palaeowetlands to be used in the field or core laboratory by sedimentologists, providing examples from the Guadix Basin (southern Spain). Abstract Present wetlands have proven to be delicate, biodiverse ecosystems, that are natural sinks for CO2 and act as good indicators for climate changes.
S. Pla‐Pueyo, E. H. Gierlowski‐Kordesch   +1 more
wiley   +1 more source

Chondrules and Nebular Shocks [PDF]

, 2002
Beneath the fusion-encrusted surfaces of the most primitive stony meteorites lies not homogeneous rock, but a profusion of millimeter-sized igneous spheres. These chondrules, and their centimeter-sized counterparts, the calcium-aluminum-rich inclusions, comprise more than half of the volume fraction of chondritic meteorites.
arxiv   +1 more source

MAGMATIZM AND EPITHERMAL Ag-Au ORE MINERALIZATION OF KRASNOYARSK GOLD ORE FIELD OF GORNY ALTAI

Известия Томского политехнического университета: Инжиниринг георесурсов, 2019
The relevance of the study is caused by the need of researching petrology, geochemistry subvolcanic rocks and epithermal Ag-Au ore mineralization of Krasnoyarsk ore field of Gorny Altai.
Anatoliу I. Gusev, Evgeniya M. Tabakaeva   +1 more
doaj   +1 more source

Routine characterization and interpretation of complex alkali feldspar intergrowths [PDF]

, 2015
Almost all alkali feldspar crystals contain a rich inventory of exsolution, twin, and domain microtextures that form subsequent to crystal growth and provide a record of the thermal history of the crystal and often of its involvement in replacement ...
Fitz Gerald, John D., Lee, Martin R., Parsons, Ian   +2 more
core   +1 more source

South American Great Basin: Limnogeological analysis of the Salina del Bebedero Basin, Argentina (Late Pleistocene‐recent)

The Depositional Record, EarlyView.
. The Bebedero tectonic depression in San Luis province, Argentina, is a closed drainage basin that has formed as a result of block‐faulting and rifting processes. The Bebedero lake exhibits notable similarities to the endorheic watersheds of the western United States, particularly those of Death Valley, the Saline Valley and, to a lesser extent, the ...
Eimi Ailen Font, Jorge O. Chiesa, David E. Traverso   +2 more
wiley   +1 more source

Coherent changes in wood charcoals, site occupation and lithic technology across the MIS 4/3 transition at Klein Kliphuis rock shelter, South Africa

Journal of Quaternary Science, Volume 38, Issue 1, Page 38-48, January 2023., 2023
Abstract We explore the correspondence between changing palaeoenvironments, patterns of site use, and lithic technology at the rock shelter site Klein Kliphuis (South Africa) across the interval 65–55 000 years before present. This period coincides with the termination of Marine Isotope Stage (MIS) 4, and the disappearance of an iconic late Pleistocene
Alex Mackay, Caroline R. Cartwright
wiley   +1 more source

Incorporation of a Late-forming Chondrule into Comet Wild 2 [PDF]

, 2011
We report the petrology, O isotopic composition, and Al-Mg isotope systematics of a chondrule fragment from the Jupiter-family comet Wild 2, returned to Earth by NASA's Stardust mission. This object shows characteristics of a type II chondrule that formed from an evolved oxygen isotopic reservoir.
arxiv   +1 more source

Composition, structure and fluid regime of differentiated porphyritic intrusion Magnitogorsk iron-ore deposit (Southern Urals)

Литосфера, 2016
Case study of the differentiated subvolcanic porphyritic intrusion underlying Magnitogorsk skarn-magnetite deposit revealed regular relations between petrochemistry features of the rocks and composition of halogens (Cl and F) in the accessory apatite ...
T. D. Bocharnikova, V. V. Holodnov, E. S. Shagalov, E. V. Konovalova   +3 more
doaj  

Petrology and geochemistry of the NWA 3368 Eucrite [PDF]

, 2006
We report the petrology and geochemistry of NWA 3368, a new non-cumulate, monomict eucrite breccia with a variety of clast sizes and a pink-tinted matrix.
Domanik, K.J., Drake, M.J., Franchi, I.A., Gardner, K.G., Goreva, J.S., Hill, D.H., Lauretta, D.S.   +6 more
core   +1 more source

Chemical and textural equilibration of garnet during amphibolite-facies metamorphism: The influence of coupled dissolution-reprecipitation [PDF]

, 2017
Metamorphic equilibration requires chemical communication between minerals and may be inhibited through sluggish volume diffusion and or slow rates of dissolution in a fluid phase.
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core   +2 more sources