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SHRIMP U–Pb dating of coesite‐bearing zircon from the

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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Jurassic zircons from the Southwest Indian Ridge

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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Timing of eclogite facies metamorphism in the North

Oxygen Isotopes in Zircon John W. Valley Department of Geology & Geophysics University of Wisconsin Madison, Wisconsin 53706 [email protected] INTRODUCTION Isotopic and trace element analysis of zircons can provide reliable and robust estimates of age, compositions of coexisting minerals and melts, and constraints on the genesis and

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

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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U-Pb Geochronology and Geochemistry of U-Rich Garnet from

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 notion that radioactive dating somehow proves the earth is billions of years old. Sm-Nd and Lu-Hf

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CV - grahamhpgeo.com

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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Plešovice zircon A new natural reference material for Pb

Hao Cheng, Eizo Nakamura and Zuyi Zhou, Garnet Lu–Hf dating of retrograde fluid activity during ultrahigh-pressure metamorphic eclogites exhumation, Mineralogy and Petrology, 95, 3-4, (315), (2009).

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ICP-MS Lab Publications | Quadrupole ICP-MS Lab

Garnet effect on Nd-Hf isotope decoupling: Evidence from the Jinfosi batholith, Northern Tibetan Plateau Hui Huanga,b,⁎, Yaoling Niua,c,d,⁎⁎, Xuanxue Moa a School of Earth Science and

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Separating metamorphic events in the Fosdick migmatite

143Nd/144Nd, 176Hf/177Hf, 87Sr/86Sr, and 208Pb/206Pb are constant within analytical uncertainty, indicating that they were derived from a common source. The source is homogeneous with respect to parent/daughter ratios Lu/Hf, Sm/Nd, Rb/Sr, and Th/U; therefore, the measured variations of

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High-pressure Tethyan Himalaya rocks along the India-Asia

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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Oxygen Isotopes in Zircon - University of Wisconsin–Madison

ropes in a laboratory plasma. Wen Li, University of California, Los Angeles, Evaluation of whistler-mode chorus intensifica-tion on the nightside during an injection event ob-served on the THEMIS spacecraft. Nicholas M. Pedatella, University of Colo-rado, Boulder, Variability in the longitudinal struc-ture of the low-latitude ionosphere.

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Lawsonite Lu-Hf geochronology: A new geochronometer for

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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Lu hf garnet dating usa laboratory - awabe.com

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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Eos aBOUT aGU - agupubs.onlinelibrary.wiley.com

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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Problematic Mesoproterozoic fossil Horodyskia from Glacier

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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Early evolution of the Pamir deep crust from Lu-Hf and U

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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Crust–Mantle Interaction in a Continental Subduction

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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Application of Lu–Hf garnet dating to unravel the

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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Atmospheric Ar and Ne returned from mantle depths to the

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Lu–hf garnet geochronology: closure temperature relative

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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Chemical and isotopic constraints on the generation and

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

In the thin section, exsolution of pyroxene + rutile ± apatite ± hornblende has been found within garnet. Garnets in these eclogites are mantled by plagioclase + diopside + hornblende. In addition to the petrography, we will explore the Lu-Hf and Sm-Nd isotope behavior in …

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

Garnet is a common mineral in metamorphic rocks and hydrothermally-altered rocks such as skarn. Geochemical characteristics of garnet have been widely used to investigate complex magmatic, metamorphic and hydrothermal processes [1,2,3,4,5,6,7]. Dating of these processes could be achieved by garnet Sm-Nd or Lu-Hf geochronology [8,9,10].

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SUPPLEMENTARY DATA Sample characterization methods

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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(PDF) Phosphate Lu–Hf geochronology | Gry Barfod

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Vita Christopher L. Andronicos 1. EDUCATION

Dating Subduction Zone Metamorphism: Testing the Effect of Pressure-temperature Path on Lawsonite Lu-Hf Geochronology Vervoort, Jeffrey Washington State University, Pullman, WA, United States

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Dating Subduction Zone Metamorphism: Testing the Effect of

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.

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Garnet–Zircon Oxygen Isotope Record of Subduction and

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2013 GSA Annual Meeting in Denver: 125th Anniversary of

Zircon and garnet recrystallization occurred at 1.87 Ga within a gneissic foliation, while a coarse-grained garnet precursor nucleated 230 m.y. earlier during a stage of high heat flow within thickened lower crust, the latter of which is nearly absent in the zircon and monazite age …

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Jeff rey D. Vervoort - Washington State University

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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Two billion years of magmatism recorded from a single Mars

Lu–Hf dating of garnet from this sample produced a robust isochron at 108.3 ± 4.1 Ma (2σ; MSWD = 0.91; Fig. 5B). This isochron is defined by five whole-rock and seven garnet fractions . The 176 Lu/ 177 Hf for the garnet fractions ranged from 0.18 to 0.26. These ratios are also quite low for garnets and indicate the presence of a Hf-rich

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Christine Siddoway | Colorado College - Academia.edu

Young eclogite from the Greater Himalayan Sequence, Arun Valley, eastern Nepal: a Department of Geosciences, Boise State University, Boise, ID 83725, USA b School of Earth and Environmental Sciences, Washington State University, we use Lu–Hf dating techniques on garnet, an eclogite-facies mineral, to provide the first direct

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

Stefan Jung, Soenke Brandt, Rebecca Bast, Erik E. Scherer and Jasper Berndt, Metamorphic petrology of a high‐T/low‐P granulite terrane (Damara belt, Namibia) – Constraints from pseudosection modelling and high‐precision Lu–Hf garnet‐whole rock dating, Journal of …

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Garnet effect on Nd-Hf isotope decoupling: Evidence from

4/18/2017 · In situ zircon Lu–Hf isotope analysis. After the SIMS and LA-ICP-MS analyses, the in situ measurement of zircon Lu–Hf isotopes was performed at the State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, CAS, Beijing and the State Key Laboratory of Geological Processes and Mineral Resources, CUG, Wuhan.