Results 181 to 190 of about 77,130 (271)

Petrological diversity of continental arc magmatism evidenced by Triassic magmatic complexes in East Kunlun Orogen. [PDF]

Sci Rep
Gan J, Wang W, Yan D, Zhou H, Xiong F, Zhou H, Li H.   +6 more
europepmc   +1 more source

Initial Conditions of Planet Formation: Time Constraints from Small Bodies and the Lifetime of Reservoirs in the Solar Protoplanetary Disk. [PDF]

Space Sci Rev
Schönbächler M, Bouvier A, Kita NT, Kruijer TS.   +3 more
europepmc   +1 more source

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Lu-Hf and Sm-Nd isotope systems in zircon

Reviews in Mineralogy and Geochemistry, 2003
As a significant carrier of uranium, thorium and the rare earth elements (REEs) at ppm level, and hafnium at the percent level, zircon hosts a remarkable number of long-lived radioactive isotopes and their stable decay products. These include 238U, 235U and 232Th which decay via intermediate steps to 206Pb, 207Pb and 208Pb, respectively, 176Lu which ...
P. Kinny, R. Maas
openaire   +2 more sources

Do supercontinents introvert or extrovert?: Sm-Nd isotope evidence

Geology, 2003
In recent years, two end-member models for the formation of supercontinents have emerged. In the classical Wilson cycle, oceanic crust generated during supercontinent breakup (the interior ocean) is consumed during subsequent amalgamation so that the supercontinent turns “inside in” (introversion).
J. Brendan Murphy, R. Damian Nance
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Comparative Sm-Nd isotope behavior of accessory minerals: Reconstructing the Sm-Nd isotope evolution of early Archean rocks

Geochimica et Cosmochimica Acta, 2022
Da Wang, Steven B. Shirey, Richard W. Carlson, Christopher M. Fisher, Anthony I.S. Kemp, Marion E. Bickford   +5 more
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Combined La–Ce and Sm–Nd isotope systematics in petrogenetic studies

Nature, 1987
A theoretical model is presented for the coupled evolution of cerium and neodymium isotopes in terrestrial rocks. Data presented for samples ranging from mid-ocean-ridge basalts to continental metamorphic rocks show that, while mantle-derived rocks are dispersed on a Ce-Nd diagram, continental crustal rocks form a clearly defined 'mantle array'.
T. Tanaka, H. Shimizu, Y. Kawata, A. Masuda   +3 more
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Sm-Nd isotope study of early Archean rocks, Qianan, Hebei Province, China

Geochimica et Cosmochimica Acta, 1986
The geochronology of amphibolitic and gneiss rocks in the Qianan region in China is examined. Sm-Nd isotopic measurements were performed to determine if the rocks existed in the early Archean age. The average age for the amphibolite samples is 3.50 + or - 0.08 billion years with an initial epsilon(Nd) value of 3.3 + or - 0.3, and for the gneiss samples
Xuan Huang, Bi Ziwei, Donald J DePaolo
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Change of Sm-Nd isotope composition during weathering of till

Geochimica et Cosmochimica Acta, 2000
Weathering of till in northern Sweden results in the formation of well-developed spodosols. The till is dominated by 1.9–1.8 Ga granitic material. The REE are among the elements most strongly depleted during weathering, and the loss of REE from the E-horizon decreases as the atomic number increases.
Björn Öhlander, Johan Ingri, Magnus Land, Hans Schöberg   +3 more
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A straightforward separation scheme for concomitant Lu–Hf and Sm–Nd isotope ratio and isotope dilution analysis

Analytica Chimica Acta, 2005
Abstract A new method is described for the concomitant use of the Lu–Hf and Sm–Nd radiogenic isotope systems on the same rock digest. After total spiking with two mixed 176 Lu– 179 Hf and 149 Sm– 150 Nd enriched tracers, the sample is decomposed by fusion with a LiBO 2 flux in an induction furnace.
Brieuc Le Fèvre, Christian Pin
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