Results 101 to 110 of about 77,130 (271)

Discussion on Sm–Nd isotopic age of Precambrian–Cambrian boundary in China [PDF]

Geological Magazine, 1997
M. J. M. Turnbull & S. Moorbath comment: The paper of Yang et al. (1996) describes a novel dating approach, using the Sm–Nd method on phosphatic material, to determine the age of the Precambrian–Cambrian boundary. The dates reported are of a precision which, in light of the relatively small range of 147Sm/144 Nd ratios (0.09–0.17), is
openaire   +1 more source

Age, provenance and tectonic setting of the high-grade Jequitinhonha Complex, Araçuaí Orogen, eastern Brazil

Brazilian Journal of Geology
: The Jequitinhonha Complex of the northeastern Araçuaí orogen is an extensive sedimentary unit metamorphosed in the amphibolite-granulite facies transition around 580-545 Ma.
Tatiana Gonçalves Dias, Fabrício de Andrade Caxito, Antônio Carlos Pedrosa-Soares, Ross Stevenson, Ivo Dussin, Luiz Carlos da Silva, Fernando Alkmim, Márcio Pimentel   +7 more
doaj   +1 more source

Isotope-geochronological study of Ingozero massive (the Kola Peninsula)

Vestnik MGTU, 2018
The Ingozero massive composed of Archeaen gneisses and granitoids is situated in the north-eastern part of the Belomorian mobile belt. The Ingozero massive petrochemical and geochemical characteristics are similar to those of tonalite-trondhjemite ...
Nitkina E. A. , Bayanova T. B.
doaj   +1 more source

Disturbances in the Sm–Nd isotope system of the Acasta Gneiss Complex—Implications for the Nd isotope record of the early Earth

Earth and Planetary Science Letters, 2020
C. Fisher, A. Bauer, J. Vervoort
semanticscholar   +1 more source

Trace element geochemistry of peridotites from the Izu-Bonin-Mariana Forearc, Leg 125

, 1992
Trace element analyses (first-series transition elements, Ti, Rb, Sr, Zr, Y, Nb, and REE) were carried out on whole rocks and minerals from 10 peridotite samples from both Conical Seamount in the Mariana forearc and Torishima Forearc Seamount in the Izu ...
Ingram, G., Johnson, K. T. M., Parkinson, I. J., Pearce, J. A., Thirlwall, M. F.   +4 more
core   +1 more source

Procedure for Sm-Nd Internal Isochron Dating Method on Basalt by Phase Separation

Yankuang ceshi, 2014
Accurately dating the age of basalt has been an important scientific issue for geologists. Due to its unique texture and composition, the basaltic minerals are limited to certain types, with scarce zircons in tiny grain sizes.
ZHANG Li-guo, DUAN Gui-ling, YANG Hong-mei, YANG Mei, TAN Juan-juan, DUAN Rui-chun, QIU Xiao-fei, LIU Chong-peng   +7 more
doaj   +2 more sources

Isotopic distribution of bioavailable Sr, Nd, and Pb in Chungcheongbuk-do Province, Korea

Journal of Analytical Science and Technology
Background Mapping the distribution of bioavailable isotope ratios across landscapes serves as an efficient geochemical tool for delineating the origins and migration trajectories of humans and animals.
Min-Ji Jung, Youn-Joong Jeong, Woo-Jin Shin, Albert Chang-sik Cheong   +3 more
doaj   +1 more source

LU-HF Age and Isotope Systematics of ALH84001 [PDF]

, 2009
Allan Hills (ALH) 84001 is an orthopyroxenite that is unique among the Martian meteorites in having the oldest inferred crystallization age (approx..4.5 to 4.0 Gyr) [e.g., 1-6 and references therein 7].
Beard, B. L., Brandon, A. D., Lapen, T. J., Peslier, A. H., Righter, M., Shafer, J. T.   +5 more
core   +1 more source

South Asian monsoon history over the past 60 kyr recorded by radiogenic isotopes and clay mineral assemblages in the Andaman Sea [PDF]

, 2015
The Late Quaternary variability of the South Asian (or Indian) monsoon has been linked with glacial‐interglacial and millennial scale climatic changes but past rainfall intensity in the river catchments draining into the Andaman Sea remains poorly ...
Ali, Sajid, Frank, Martin, Gebregiorgis, Daniel, Giosan, Liviu, Hathorne, Ed C., Johnson, Joel E., Kutterolf, Steffen, Stattegger, Karl, Stumpf, Roland   +8 more
core   +1 more source

Nuclide inventory analysis and fission product monitoring for nuclear safeguards in molten chloride fast reactors

Nuclear Engineering and Technology
Fission product analysis offers a powerful means to real-time monitoring of fissile material evolution and sudden alterations in Molten Chloride Fast Reactors, where conventional safeguards techniques are challenged by continuously circulating fuel.
Saehyun Choi, Jeongwon Seo, Wonseok Yang, Jihun Kim, Taehoon Park, Sujeong Lee, Sungyeol Choi   +6 more
doaj   +1 more source