Results 171 to 180 of about 2,046 (219)

New U-Pb constraints and geochemistry of the East Kirkton Quarry, Scotland: Implications for early tetrapod evolution in the Carboniferous. [PDF]

PLoS One
Garza HK, Catlos EJ, Lapen TJ, Clarke JA, Brookfield ME.   +4 more
europepmc   +1 more source

A 13.06 Ma widespread ignimbrite in the Pannonian Basin captured a snapshot of shallow marine to coastal environment in Central Paratethys. [PDF]

Sci Rep
Karátson D, Lahitte P, Portnyagin M, Palotai M, Józsa S, Márton E, Tóth E, Erdei B, Nomade S, Németh K, Iván L, Krasznai M, Vörös F, Biró T, Paquette JL, Hably L, Hír J, Prakfalvi P, Kiss J, Pécskay Z, Frick DA, Hencz M.   +21 more
europepmc   +1 more source

Incipient continent formation by shallow melting of an altered mafic protocrust. [PDF]

Nat Commun
Hartnady MIH, Schorn S, Johnson TE, Zametzer A, Schmitt AK, Ribeiro BV, Hugh Smithies R, Barham M, Kirkland CL.   +8 more
europepmc   +1 more source

Magmatic evolution of the Kikai caldera revealed by zircon triple dating and its chemistry. [PDF]

Sci Rep
Ito H.
europepmc   +1 more source

Linking mineral chemistry and radiological risk in rare-metal-bearing monzogranite in Egypt. [PDF]

Sci Rep
Ghoneim MM.
europepmc   +1 more source

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Interpretation of discordant U‐Pb zircon ages: An evaluation

Journal of Metamorphic Geology, 1997
The most widely used technique for the determination of high precision mineral growth ages in igneous and metamorphic rocks is dating of zircons with the U‐Pb method. The interpretation of these ages, particularly in metamorphic settings, is hampered by an incomplete understanding of the common phenomenon of partial Pb‐loss in zircon.
Mezger, Klaus, KROGSTAD, E. J.
openaire   +1 more source

Discordant Zircon U–Pb Ages from the Uganda Basement

Nature Physical Science, 1971
FOR several years there has been controversy about the ages of the Uganda basement gneisses. Potassium–argon ages of micas from the basement rocks1 range from 600 to 415 m.y. whereas results for the apparently unconformably overlying Karagwe–Ankolean and Buganda–Toro sedimentary systems2,3 to the south (around the north end of Lake Victoria) suggest an
P. J. LEGGO, M. AFTALION, R. T. PIDGEON
openaire   +1 more source

Zircon U-Pb ages for the Early Cambrian time-scale

Journal of the Geological Society, 1992
Single zircons from two Early Cambrian volcanic horizons have been analysed using the SHRIMP ion microprobe. Full details of the analytical procedures and data reduction are given. Zircons from tuff within the Lie de Vin Formation, near Tiout, Morocco, show little spread in U-Pb age and have a mean value of 521 ± 7 Ma (2σ).
Compston, W., Williams, I. S., Kirschvink, J. L., Zichao, Zhang, Guogan, Ma   +4 more
openaire   +2 more sources

Zircon UPb ages of Guyana greenstone-gneiss terrane

Precambrian Research, 1982
Abstract Isotopic UPb studies of zircons collected from weathered metagreywackes of the Barama-Mazaruni Supergroup of northern Guyana, South America, demonstrate an age of origin of ca. 2250 Ma. This is the best estimate for the age of the associated metavolcanic rocks.
Allan K. Gibbs, William J. Olszewski
openaire   +1 more source

Solidification timescale for the Dufek Intrusion, Antarctica determined by U-Pb zircon ages

Geological Society of America Abstracts with Programs, 2019
<p>The 8-9 km thick Dufek layered mafic intrusion of Antarctica was emplaced at approximately 182 Ma associated with the Ferrar dolerites and the breakup of the supercontinent Gondwana.  It is rivaled in thickness only by the Bushveld Complex of South Africa and shows a similar progression in mineral compositions all
Jill VanTongeren, Aidan Taylor, Blair Schoene   +2 more
openaire   +1 more source