A Sm-Nd isotopic study of atmospheric dusts and particulates from major river systems

Goldstein, Steven L.; O’Nions, R.K.; Hamilton, P. J.

doi:10.1016/0012-821x(84)90007-4

Cited by 1,571 publications

(695 citation statements)

References 46 publications

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“…DePaolo (1981), whereby the evolution of the DM is given by: eNd(T)DM = 0.25T^2 -3T ? 8.5 and iteration versus the eNd(T) of the sample provides T DM 1 (T in Ga); (b) T DM 2 is a one-stage model calculated assuming a linear Nd isotopic growth of the DM from eNd = 0 at 4.56 to ?10 at the present (Goldstein et al 1984 (Vervoort and Patchett 1996). Fig.…”

Section: Whole-rock Nd-sr Isotope Analysesmentioning

confidence: 70%

“…The gray field represents of the Sa'al schist represent the evolution from the maximum age of this rock at 1.0 Ga (Be'eri- Shlevin et al 2009c). G DM and D DM are the depleted mantle evolutionary curves according to models of Goldstein et al (1984) and DePaolo (1981) respectively. TPG Timna porphyritic granite.…”

Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 99%

“…Rocks of both suites are characterized by initial Nd, and Hf isotope ratios (eNd of ?1.1 to 5.6 and eHf of ?5.5 to ?9.9, and ?13.9) that are less depleted than the predicted a DM values at *600 Ma [eHf of about ?14, eNd of about ?6.5, or ?9.5 using DM evolutionary lines of DePaolo (1981) and Goldstein et al (1984) respectively] (Figs. 4, 6).…”

Section: Deviations From Nd and Hf Depleted Mantle Model Valuesmentioning

confidence: 99%

“…Importantly, T DM ages critically depend on various assumptions and on values assigned to several parameters that are used in the model. Over the past decades the model parameters of DePaolo (1981) have been preferred over those of Goldstein et al (1984) in calculating Nd-T DM ages for ANS rocks (Hargrove et al, 2006;Moussa et al, 2008;Stern, 2002).…”

Section: Hf and Nd Model Agesmentioning

confidence: 99%

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Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Be’eri-Shlevin

Katzir

Blichert‐Toft

et al. 2009

Contrib Mineral Petrol

103

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Multi-isotope study including whole-rock NdSr, single zircon Hf, and SIMS d 18 O analyses of zircons sheds light on magma sources in the northernmost Arabian-Nubian Shield (ANS) during *820-570 Ma. Reconnaissance initial Nd and Sr isotope data for the older rocks (*820-740 Ma) reaffirms previous estimates that early crustal evolution in this part of the shield involved some crustal contamination by pre-ANS material. Prominent isotope provinciality is displayed by post-collisional calc-alkaline and alkaline igneous rocks of *635-570 Ma across a NW-SE transect across basement of the Sinai Peninsula (Egypt) and southern Israel. Silicic rocks of the NW-region are characterized by lower eNd(T)-eHf(T) and higher Sr i and d 18 O compared with rocks of the SE-region, and the transition between the regions is gradual. Within each region isotope ratios are independent of the extent of magma fractionation, and zircon cores and rims yield similar d 18 O values. Comparison with southern segments of the ANS shows that the source for most *635-570 Ma rocks can be modeled as the isotopically aged lowerintermediate crust in the ANS core (SE-region) and its northern, more contaminated ANS margins (NW-region). Nevertheless, Nd-Sr isotope enrichment of the lithospheric mantle is indicated by some basic magmas of the NWregion displaying the most enriched Nd-Sr isotope compositions. Comparison of Nd and Hf depleted mantle model ages for rocks of the SE-region may indicate that crustal formation events in the ANS geographical core took place at 1.1-1.2 Ga and were followed by crustal differentiation starting at *0.9 Ga.

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Section: Whole-rock Nd-sr Isotope Analysesmentioning

confidence: 70%

Section: Whole-rock Sr-nd Isotope Resultsmentioning

confidence: 99%

Section: Deviations From Nd and Hf Depleted Mantle Model Valuesmentioning

confidence: 99%

Section: Hf and Nd Model Agesmentioning

confidence: 99%

See 2 more Smart Citations

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Be’eri-Shlevin

Katzir

Blichert‐Toft

et al. 2009

Contrib Mineral Petrol

103

View full text Add to dashboard Cite

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“…8). Samples GH-04, GH-06 and GH-11 presented negative εNd(t = 1,218) values ranging from -3.09 to -4.22, Nd T DM model age from 1.76 to 1.86 Ga, and fractionation factor (f Sm/Nd) between -0.48 and -0.50, calculated using the equation of Goldstein et al (1984). In general, these values are typical of crustal sources generated in the late Paleoproterozoic, during the Statherian period.…”

Section: Whole-rock Geochemistrymentioning

confidence: 99%

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

Souza

Dantas

et al. 2015

Braz. J. Geol.

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<p>The Mesoproterozoic K'Mudku event (1490 - 1147 Ma) is represented by a britlle-ductile shear belt that cuts across the Paleoproterozoic units in the southernmost Guyana shield, central-north Amazon craton. This event produced mylonitization and cataclasites at low/medium- to high-grade metamorphic, and local within-plate magmatism. In the Amazonas State, Brazil, A-type magmatism chronologically associated to K'Mudku has been reported for the Pedra do Gavião and Samaúma syenogranites. However, the spatial relationship between K´Mudku event and A-type magma generation are not yet adequately clarified in the region. The Pedra do Gavião syenogranite is a high-K alkaline, metaluminous, reduced A-type granite with a post-collisional to within-plate geochemical signature. It has U-Pb zircons crystallization age of 1218 Ma and inherited zircons with ages between 1820 and 1720 Ma, which, together with the Sm-Nd data, suggest melting of Paleoproterozoic basement rocks of the Cauaburi Complex (1810 - 1780 Ma) regional unit. These data demonstrate that the effects of the A-type magmatism associated to the end of the Grenvillian-Sunsas orogeny, reported primarily in the southwestern margin of the Amazon craton, may also be extended for the central-northern part of the Amazon craton. Probably the generation or emplacement mechanisms of A-type magma occurred with some degree of involvement in the final stages of the K´Mudku event. However, this tectonic framework conception still needs more geological and geophysical investigations. Therefore, these news data should instigate to the return of geological research in the region, as well as to debate on the tectonic evolution and A-type granites production during the Ectasian-Stenian period in the central-north Amazon craton.</p>

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Nd isotopic structure of the Pacific Ocean 70–30 Ma and numerical evidence for vigorous ocean circulation and ocean heat transport in a greenhouse world

et al. 2014

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The oceanic meridional overturning circulation (MOC) is a crucial component of the climate system, impacting heat and nutrient transport, and global carbon cycling. Past greenhouse climate intervals present a paradox because their weak equator-to-pole temperature gradients imply a weaker MOC, yet increased poleward oceanic heat transport appears to be required to maintain these weak gradients. To investigate the mode of MOC that operated during the early Cenozoic, we compare new Nd isotope data with Nd tracer-enabled numerical ocean circulation and coupled climate model simulations. Assimilation of new Nd isotope data from South Pacific Deep Sea Drilling Project and Ocean Drilling Program Sites 323, 463, 596, 865, and 869 with previously published data confirm the hypothesized MOC characterized by vigorous sinking in the South and North Pacific~70 to 30 Ma. Compilation of all Pacific Nd isotope data indicates vigorous, distinct, and separate overturning circulations in each basin until~40 Ma. Simulations consistently reproduce South Pacific and North Pacific deep convection over a broad range of conditions, but cases using strong deep ocean vertical mixing produced the best data-model match. Strong mixing, potentially resulting from enhanced abyssal tidal dissipation, greater interaction of wind-driven internal wave activity with submarine plateaus, or higher than modern values of the geothermal heat flux enable models to achieve enhanced MOC circulation rates with resulting Nd isotope distributions consistent with the proxy data. The consequent poleward heat transport may resolve the paradox of warmer worlds with reduced temperature gradients.

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A Sm-Nd isotopic study of atmospheric dusts and particulates from major river systems

Cited by 1,571 publications

References 46 publications

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

Nd–Sr–Hf–O isotope provinciality in the northernmost Arabian–Nubian Shield: implications for crustal evolution

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

Nd isotopic structure of the Pacific Ocean 70–30 Ma and numerical evidence for vigorous ocean circulation and ocean heat transport in a greenhouse world

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