Are the Taitao granites formed due to subduction of the Chile ridge? [PDF]
, 2009 The Taitao granites are distributed around the Late Miocene Taitao ophiolite (5.66 ± 0.33 Ma to 5.19 ± 0.15 Ma) exposed at the western tip of the Taitao peninsula, southern Chile, ~ 50 km southeast from the present day Chile triple junction.
Anma Ryo +14 more
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U-Pb isotope ages of granitic plutons near Cananea, Sonora
Economic Geology, 1977 The Cananea "granite" crops out in the Cananea mining district, which includes some of the most important known copper deposits in Mexico. The area is in northern Sonora, approximately 100 km southeast of the twin cities of Nogales, Arizona-Sonera, on the international border.By means of isotopic analyses of U-Pb systems in cogenetic suites of zircon ...
Anderson, Thomas H., Silver, Leon T.
openaire +2 more sources
CrystalsGem-quality garnets, with their high closure temperature (750–800 °C), high transparency, uniform composition, and purity, offer promising prospects for U-Pb dating.
Siyi Zhao, Bo Xu, Yi Zhao
doaj +1 more source
Age of younger tonalitic magmatism and granulitic metamorphism in the South Indian transition zone (Krishnagiri area); comparison with older Peninsular gneisses from the Gorur-Hassan area [PDF]
, 1993 A major episode of continental crust formation, associated with granulite facies metamorphism, occurred at 2.55-2.51 Ga and was related to accretional processes of juvenile crust. Dating of tonalitic-trondhjemitic, granitic gneisses and charnockites from
Jayananda, M. +2 more
core +1 more source
Correlation Between U/Th and Pb/Os Abundance Ratios and its Application in Nuclear Cosmochronology
The Astrophysical JournalThe abundance ratios of radioactive elements U/Th and stable elements Pb/Os from the r -process are found to have a strong correlation. This correlation is quite robust with respect to astrophysical conditions.
Y. Y. Huang +3 more
doaj +1 more source
Geochemical and geochronological constraints on the geologic evolution of the western Sonobari Complex, northwestern Mexico [PDF]
, 2013 In the southern Sierra Sonobari, NW Mexico, U-Pb and 40Ar/39Ar geochronology studies allowed to define the provenance and maximum depositional age of the Francisco Gneiss basement of the Sonobari terrane, and to establish the age of some magmatic events ...
Gómez-Juárez, O.S. +5 more
core +3 more sources
Early history of the moon: Implications of U-Th-Pb and Rb-Sr systematics [PDF]
Anorthosite 60015 contains the lowest initial Sr-87/Sr-86 ratio yet reported for a lunar sample. The initial ratio is equal to that of the achondrite Angra dos Reis and slightly higher than the lowest measured Sr-87/Sr-86 ratio for an inclusion in the C3
Numes, P. D. +2 more
core +4 more sources
U-Th-Pb isotopic systematics of lunar meteorite Asuka-31 [PDF]
, 1992 U-Th-Pb isotopic systematics indicate that Asuka-31 is of lunar origin and was formed 3940±8Ma. The Pb isotopic composition is extremely nonradiogenic compared with those of typical Apollo mare basalts. The Pb-Pb, U-Pb, and Th-Pb ages are concordant at 3.
Keiji Misawa +2 more
core +1 more source
U-Th-Pb Dating of Monazite by LA-ICP-MS Using Ablation Spot Sizes of 16 μm and 10 μm
Yankuang ceshi, 2016 Monazite is a common geological chronometer and has complex textures and different chemical domains. Meaningful U-Th-Pb ages for different domains can be obtained only using a suitably small laser beam spot.
WANG Shuang-shuang +5 more
doaj +1 more source