Results 41 to 50 of about 3,078 (99)

Paleoproterozoic post-orogenic magmatism in southern Finland; geochemical, geochronological and Sr-Nd isotopic constraints on origin and magmatic evolution [PDF]

Bulletin of the Geological Society of Finland
Fifteen post-orogenic, basic to acidic High-Barium-Strontium (HiBaSr) intrusions of shoshonitic affinity have been recognized in central and southern Finland.
Oliver Teräs, Kaisa Nikkilä, Perttu Mikkola, Anna Kotilainen, Olav Eklund, O. Tapani Rämö   +5 more
doaj   +1 more source

LA-MC-ICP-MS dating of zircon from chromitite of the Archean Bangur Gabbro Complex, Orissa, India – Ambiguities and constraints

Geologica Acta, 2015
The Mesoarchean chromitites in the Singhbhum craton provide the main source of chromium in India. We report here results of dating zircon grains that were found in the chromitite of ultramafic rocks belonging to the southern part of the Archean Baula ...
P. V. SUNDER-RAJU, E. HANSKI, Y. LAHAYE
doaj  

EDADES U-Pb DEL BATOLITO ANTIOQUEÑO

Boletín de Ciencias de la Tierra, 2007
El batolito Antioqueño enclavado en el centro del departamento de Antioquia es por varias razones el cuerpo intrusivo más importante de la Cordillera Central colombiana. Cubre un área de casi 8000 km2 y se compone esencialmente de granodiorita y tonalita.   Análisis K-Ar en biotitas describen un intervalo de edades, entre 63 Ma y 90 Ma.
Ordóñez C., Oswaldo, Martins Pimentel, Marcio, Henrique Laux, Jorge   +2 more
openaire   +3 more sources

U redox state tracked in mineralized hydrothermal carbonate with implications for U-Pb geochronology

Communications Earth & Environment
U-Pb carbonate geochronology can directly constrain the timing and rates of important geological processes. However, the mechanisms and controls on U incorporation, distribution, and retention in carbonate minerals remain unclear, limiting geological ...
Sarah Bowie, Catherine Mottram, E. Troy Rasbury, Paul Northrup, Ryan Tappero, Dawn Kellett   +5 more
doaj   +1 more source

The results of U-Pb SHRIMP-II dating of zircon from granitoids of Talitsky molybdenum-bearing massif (eastern slope of the Middle Urals)

Литосфера, 2017
Age position and geodynamic conditions of molybdenum metallization and productive granitoids of the Urals formation are very little studied now. This publication contains the results of isotopic dating of granites from Talitsa Cu-Mo-porphyry deposit ...
N. Smirnov Vladimir, S. Ivanov Kirill, P. Shokalsky Sergey, L. Ronkin Yury   +3 more
doaj   +1 more source

Late Paleozoic oxygenation of marine environments supported by dolomite U-Pb dating

Nature Communications
Understanding causal relationships between evolution and ocean oxygenation hinges on reliable reconstructions of marine oxygen levels, typically from redox-sensitive geochemical proxies.
Michal Ben-Israel, Robert M. Holder, Lyle L. Nelson, Emily F. Smith, Andrew R. C. Kylander-Clark, Uri Ryb   +5 more
doaj   +1 more source

Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém - Brazil

Anais da Academia Brasileira de Ciências, 2007
Analytical procedures for U-Pb isotope dilution analyses at the Pará-Iso isotope geology laboratory of the Federal University of Pará (UFPA) are described in detail. The procedures are applied to zircon, titanite, rutile, apatite, columbite-tantalite and
Robert S. Krymsky, Moacir J.B. Macambira, Jean-Michel Lafon, Gérson S. Estumano   +3 more
doaj   +1 more source

T-t Evolution of the Early Proterozoic Rocks in the Northern Ladoga Region from the Data on U-Pb, Rb-Sr and Sm-Nd Systems in Minerals

Геодинамика и тектонофизика
This paper presents the results of a study of isotopic systems in minerals and rocks in southern margin of the epi-Archean Karelian craton in the zone of its junction with the Svecofennian mobile belt.
Sh. K. Baltybaev, V. M. Savatenkov, M. E. Petrakova   +2 more
doaj   +1 more source

THE AGE OF EARLY COLLISIONAL GRANITOIDS OF WESTERN SANGILEN (SE TUVA): IMPLICATIONS FOR ESTIMATING THE DURATION OF OROGENY AT THE MARGIN OF THE TUVA-MONGOLIAN MASSIF

Геодинамика и тектонофизика
The first U-Pb isotope-geochronological data were obtained on the age of early collisional granitoids of the Matut massif (Western Sangilen, SE Tuva).
D. V. Semenova, V. G. Vladimirov, I. V. Karmysheva, V. A. Yakovlev   +3 more
doaj   +1 more source

S1: U–Pb Methodology. Detrital zircon U–Pb insights into the timing and provenance of the South Pyrenean Jaca Basin

, 2019
Supplementary material 1: Extended Zircon U–Pb LA–ICP–MS methodology.
Roigé, M., Gómez-Gras, D., Stockli, D.F., Teixell, A., Boya, S., Remacha, E.   +5 more
openaire   +1 more source