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Zircon U–Pb ages and Hf isotopic compositions from the Sin

Rare-Earth Clocks, Sm-Nd and Lu-Hf Dating Models: Radioactive Dating, Part 5 BY VERNON R. CUPPS, I spent my career as a nuclear physicist at the Los Alamos National Laboratory and the Fermi National Accelerator. Now in my 60s, God has placed me in a unique position here at the Institute for Creation Research to further dispel the common

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Jurassic zircons from the Southwest Indian Ridge

Following digestion, both whole-rock and garnet fractions were equilibrated with 176 Lu-180 Hf and 149 Sm-150 Nd tracer spikes on a hot plate. Sm, Nd, Lu, and Hf were separated from final solutions using several different types of cation exchange resins. Details of these separation techniques are described in Cheng et al. (2008).

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CV - grahamhpgeo.com

Zircon Lu–Hf isotopic ratios were measured on a Neptune multi-collector ICP-MS (Thermo Fisher Scientific, Waltham, MA, USA) at the Institute of Geology and Geophysics, Chinese Academy of Sciences. The laser system delivers a beam of 193 nm UV light from a Geolas excimer laser ablation system. Sampling spots had beam

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ICP-MS Lab Publications. Peer Reviewed. 2019 in review. Maciel, T.R., Avigliano, E., Maichak de Carvalho, B. Miller, N., and Vianna, M., submitted 6/6/19, Population

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Dating Subduction Zone Metamorphism: Testing the Effect of

Our faculty and students also collaborate (commonly including extended visitations) with a number of other laboratories for techniques such as U-Th-Pb dating of zircon, monazite and sphene, Lu-Hf garnet geochronology, (U-Th)/He analysis, and fission track thermochronometry.

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Garnet Lu–Hf dating of retrograde fluid activity during

2/1/2017 · The timing and nature of igneous activity recorded at a single Mars ejection site can be determined from the isotope analyses of Martian meteorites. Northwest Africa (NWA) 7635 has an Sm-Nd crystallization age of 2.403 ± 0.140 billion years, and isotope data indicate that it is derived from an incompatible trace element–depleted mantle source similar to that which produced a geochemically

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Surface & Hydrologic Processes | Jackson School of

Coupled microsampling of growth zones for Lu–Hf and Sm–Nd dating would thus provide better constraints for growth (and/or cooling) history of garnet (and associated tectono-metamorphism) than a single chronometric system would, and may also resolve any volumetric mixing issues stemming from the use of bulk garnet Lu–Hf and Sm–Nd dates

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Problematic Mesoproterozoic fossil Horodyskia from Glacier

1 1 Revision 3 2 Combined geochemistry and geochronology constrains coupled subduction of oceanic and 3 continental crust in the Huwan shear zone, central China 4 5 HAO CHENG 1,* and JEFFREY D. VERVOORT 2 6 7 1State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China 8 2School of the Environment, Washington State University, Pullman, WA 99164, USA

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Timing of eclogite facies metamorphism in the North

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Radioisotope Decay Constants and Half-Lives: Lutetium-176

Categorías. Categorías

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Combined geochemistry and geochronology constrains coupled

ABSTRACT In this study, in situ U–Pb monazite ages and Lu–Hf garnet geochronology are used to distinguish mineral parageneses developed during Devonian–Carboniferous and Cretaceous events in migmatitic paragneiss and orthogneiss from the Fosdick migmatite–granite complex in West Antarctica.

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Dating Ore Deposit Using Garnet U–Pb Geochronology

Transitional time of oceanic to continental subduction in the Dabie orogen: Constraints from U-Pb, Lu-Hf, Sm-Nd and Ar-Ar multichronometric dating Washington State University, Pullman, Washington 99164, USA), AE(CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and

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Christine Siddoway | Colorado College - Academia.edu

Early evolution of the Pamir deep crust from Lu-Hf and U-Pb geochronology and garnet thermometry Matthijs A. Smit 1,2 , Lothar Ratschbacher 3 , Ellen Kooijman 2,4 , and Michael A. Stearns 2

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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4

5/17/2016 · Similarly, the relatively minor interference of 176 Lu on 176 Hf was corrected by measuring the intensity of the interference-free 175 Lu isotope and using the recommended 176 Lu/ 175 Lu …

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Atmospheric Ar and Ne returned from mantle depths to the

Lawsonite and chlo- For example, the 176Hf/177Hf of a phase with a 176 commonly seen in garnet Lu-Hf isochrons with rite show textural evidence for having grown Lu/177Hf of 4.2 will increase by 0.0007, or large ranges in Lu/Hf ratios and low analyti- at the expense of garnet and epidote (Fig. 1).

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Separating metamorphic events in the Fosdick migmatite

Laboratory methods Specimens of Horodyskia were measured with digital calipers, Lu–Hf dating of garnets reveals metamor-phic episodes at 1463±24, 1379±8, and 1151±41Ma, as well as Grenvillian episodes at 1081± 20 to 1064±10Ma (Zirakparvar et Garnet Range Formation Garnet Range Formation Dark greenish gray, micaceous arenite and

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Plešovice zircon A new natural reference material for Pb

Plešovice zircon — A new natural reference material for U–Pb dating; Hf isotopes; Bohemian Massif 1. Introduction Isotopic dating of accessory minerals by means of U-and Th-decay is the most precise and accurate technique for establishing the age of high-temperature events in low Lu/Hf and Yb/Hf values and it should also occurasmm

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Single-shot laser ablation split stream (SS-LASS

Garnet Lu–Hf mineral isochrons for eclogite (∼158 Ma) and blueschist (∼147 Ma) blocks yield generally younger ages than those for hornblendite, suggesting that the three high-grade lithologies in the Franciscan record the slow cooling of the subduction zone (Anczkiewicz et al., 2004).

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THREE NATURAL ZIRCON STANDARDS FOR U‐TH‐PB, LU‐HF,

Moreover, due to high Lu/Hf and Sm/Nd ratios, garnet can be directly dated by Lu–Hf and Sm–Nd dating . However, the commonly low Lu and Hf contents in garnet constrain the application of Lu–Hf dating . Garnet Sm–Nd isochron dating is severely complicated because of variable Nd initial isotope ratios .

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Young eclogite from the Greater Himalayan Sequence, Arun

potential for dating peridotite formation ages, providing valuable ages that are complementary to the Re-Os system. For post-Archean mantle peridotites, the key target in the Lu-Hf isotopic work is clinopyroxene (Cpx), because of its high Lu and Hf concentrations and …

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Transitional time of oceanic to continental subduction in

bulk Lu-Hf age of the garnet in these samples. Thus the proportions of eclogitic and granulitic garnet calculated in Table A3 are broad estimates only, and are best used to demonstrate that the garnet Lu-Hf age is dominated by garnet cores and likely closely approximates the measured bulk Lu-Hf ages.

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Garnet–Zircon Oxygen Isotope Record of Subduction and

High Temperature Isotope Geochemistry Laboratory Antonio Simonetti. Schmidberger SS, Simonetti A, Heaman LM, Creaser RA, Whiteford S (2007). Lu-Hf, in-situ Sr and Pb isotope and trace element systematics for mantle eclogites from the Diavik diamond mine: Evidence for Paleoproterozoic subduction beneath the Slave craton, Canada

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Chemical and isotopic constraints on the generation and

The Lu – Hf separation technique for apatite The Lu –Hf ages in this study are compared to ages involves a separation scheme that allows for efficient obtained by Rb –Sr and 40Ar – 39Ar dating methods sample processing prior to precise analyses on MC- (Table 3).

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Rare-Earth Clocks, Sm-Nd and Lu-Hf Dating Models

a State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, zircons have very high Hf contents with very low 176Lu/177Hfratios,sotheir Hf isotopic composition is a sensitive in-dicator of the source of Zr in partially melted rocks (Buick et al., 2008; inferred from U–Pb zircon dating of ca. 548–568 Ma meta

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Isotopic composition of Yb and the determination of Lu

The existence of ancient rocks in present mid-ocean ridges have long been observed but received less attention. Here we report the discovery of zircons with both reasonably young ages of about 5 Ma and abnormally old ages of approximate 180 Ma from two evolved gabbroic rocks that were dredged from the Southwest Indian Ridge (SWIR) in the Gallieni fracture zone.

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Coupled Lu–Hf and Sm–Nd geochronology on a single

2Los Alamos National Laboratory, Los Alamos, NM 87545, USA 3Ecole Normale Superiour, Lyon, France Hf, Nd, Sr, and Pb isotopic; and major and trace element compositions for a suite of 20 young midocean ridge basalts from the East Pacific Rise axis between 9°28' and 9°52'N. All of the samples were collected within the axial summit trough

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Lawsonite Lu-Hf geochronology: A new geochronometer for

Clean laboratory design and application for isotope geochemistry. of the SW USA Based on Geochronology of Garnet and AccessoryMinerals". J.D. Vervoort, PI , Washington State University, 2010-2013, $97,405. “The Lu-Hf composition of the Earth, and implications for the future of Hf isotope geochemistry".

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SUPPLEMENTARY DATA Sample characterization methods

Physical Research Laboratory, Navrangpura, Ahmedabad, 380 009, India. Diane Wilford and Lingmin Zhang, Coupled Lu–Hf and Sm–Nd geochronology on a single eclogitic garnet from the Lifei Zhang, Bin Xia and Zeng Lü, Metamorphic P-T path and zircon U-Pb dating of HP mafic granulites in the Yushugou granulite -peridotite

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Vita Christopher L. Andronicos 1. EDUCATION

Garnet from across the Fosdick complex yields Lu–Hf ages of 115–111 Ma. The melt-reintegrated pseudosections show the onset of garnet growth at ~800°C between 0.6 and 1.0 GPa up to the estimated peak P–T of 830–870°C at 0.6–0.75 GPa. Sm–Nd garnet ages of 102–99 Ma from a subset of the same samples overlap the range of U–Pb

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Single-shot laser ablation split stream (SS-LASS) petrochronology deciphers multiple, short-duration metamorphic events Daniel R. Vietea,b,⁎, Andrew R.C. Kylander-Clarkb, Bradley R. Hackerb a Department of Earth Sciences, Durham University, Durham DH1 3LE, UK b Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA 93106, USA

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ICP-MS Lab Publications | Quadrupole ICP-MS Lab

Coupled garnet Lu-Hf and monazite U-Pb geochronology constrain early convergent margin dynamics in the Ross orogen, Antarctica. Journal of Metamorphic Geology, 34, 293–319. Hagen-Peter, G., Cottle, J.M., Tulloch, A.J., and Cox, S.C. (2015). Mixing between enriched lithospheric mantle and crustal components in a short-lived subduction-related

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Tectonics - UNLV Geoscience

Application of Lu/Hf garnet dating to unravel the relationships between deformation, metamorphism and plutonism: An example from the Prince Rupert area, British Columbia, Tectonophysics, 485, 62-77. Chang, J. M.*, and Andronicos, C. L., (2009), Constraints on the depth of generation

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A number of MC‐ICPMS Lu‐Hf isotopic analyses of standard rocks and other geological samples, previously analyzed by TIMS, are presented. These document reproducibility of Lu/Hf within 0.2%, where most discrepancies can be assigned to the unknown Lu mass fractionation during TIMS analysis.

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Abstract: USING LU–HF GARNET GEOCHRONOLOGY AND INVERSE

4/13/2017 · Therefore, Lu potentially leaves the garnet at higher rates compared to its radiogenic daughter Hf and may accumulate in grain boundaries (Hiraga et al., 2004) or may be incorporated into matrix minerals or accessory phases. As a result, a lower Lu/Hf ratio is recorded in the garnet that translates into an apparent older age.

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Lu–hf garnet geochronology: closure temperature relative

Therefore, these Lu-Hf ages were interpreted to reflect high-pressure eclogite facies metamorphism. The difference between the two Lu-Hf ages likely represents the minimum duration of garnet growth and thus brackets the onset and the closure of the subduction.

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Hafnium-osmium isotope systematics of mantle peridotites

10/1/2000 · Garnet Lu–Hf replicates will therefore define a mixing array with an age-dependent slope. Since garnets in our limited data set vary in both age and powder heterogeneity, it is not feasible to determine blanket errors and ρ values for garnet analyses in general.