Results 51 to 60 of about 30,510 (167)

Discussion on Detrital zircon geochronology of the Carboniferous Baixo Alentejo Flysch Group (South Portugal); constraints on the provenance and geodynamic evolution of the South Portuguese Zone, Journal, vol. 172, 294-308 [PDF]

open access: yes, 2015
In their recent study, Rodrigues et al. (2014) attempted a provenance analysis of the Carboniferous Baixo Alentejo Flysch Group (SW Iberia), discussing variability over time in sources of South Portuguese Zone turbidites.
Pereira, M. Francisco
core   +1 more source

When do we need pan-global freeze to explain ^(18)O-depleted zircons and rocks? [PDF]

open access: yes, 2011
Rocks with δ^(18)O values of less than 5‰ SMOW (Standard Mean Ocean Water) contain oxygen derived from ∼0‰ seawater or meteoric (rain or melted snow,
Bindeman, Ilya
core   +1 more source

Possible Jurassic age for part of Rakaia Terrane: implications for tectonic development of the Torlesse accretionary prism [PDF]

open access: yes, 2001
Greywacke sandstone and argillite beds comprising Rakaia Terrane (Torlesse Complex) in mid Canterbury, South Island, New Zealand, are widely regarded as Late Triassic (Norian) in age based on the occurrence of Torlessia trace fossils, Monotis, and other ...
Andrews P. B.   +14 more
core   +2 more sources

U-Pb isotopic ages of zircons from Precambrian rocks of South Greenland

open access: yesRapport Grønlands Geologiske Undersøgelse, 1971
Results of age determinations on zircons from samples of gneiss, granite, syenite and diorite from the Ketilidian mobile belt of South Greenland are presented. The lead isotopes were determined by a direct ionisation method. As three of the four zircon concentrates gave more or less discordant results, their interpretation is difficult.
R Chessex   +5 more
openaire   +2 more sources

Shock Deformation in Zircon, a Comparison of Results from Shock-Reverberation and Single-Shock Experiments [PDF]

open access: yes
The utility of the mineral zircon, ZrSiO4, as a shock-metamorphic geobarometer and geochronometer, has been steadily growing within the planetary science community.
Cintala, M. J.   +4 more
core   +1 more source

U-Pb isotopic results for single shocked and polycrystalline zircons record 550-65.5-Ma ages for a K-T target site and 2700-1850-Ma ages for the Sudbury impact event [PDF]

open access: yes
The refractory mineral zircon develops distinct morphological features during shock metamorphism and retains these features under conditions that would anneal them in other minerals.
Bohor, B. F., Kamo, S. L., Krogh, T. E.
core   +1 more source

U-Pb zircon age of the pegmatoid of the Muong Lat complex

open access: yesScience and Technology Development Journal - Natural Sciences, 2019
Muong Lat granitoid complex located in Thanh Hoa province. It is composed of two mica granite, aplite and pegmatoid. Rock forming minerals include mainly K-feldspar, quartz biotite and muscovite. Crystallization age of pegmatite in Muong Lat body is determined by U-Pb zircon LA-ICP-MS method.
Pham Trung Hieu, Tran Van Thanh
openaire   +2 more sources

U-Pb zircon age for the Nanhua-Sinian boundary

open access: yesChinese Science Bulletin, 2005
Chu, X.   +4 more
openaire   +3 more sources

Shoshonitic enclaves in the high Sr/Y Nyemo pluton, southern Tibet: Implications for Oligocene magma mixing and the onset of extension of the southern Lhasa terrane [PDF]

open access: yes, 2020
Post-collisional potassic and high Sr/Y magmatism in the Lhasa terrane provides critical constraints on the timing and mechanism of subduction of Indian lithosphere and its role in the uplift of the Tibetan Plateau.
Asimow, Paul D.   +8 more
core  

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