Hf isotope analysis of small zircon and baddeleyite grains by conventional Multi Collector-Inductively Coupled Plasma-Mass Spectrometry

d’Abzac, François-Xavier; Davies, Joshua; Wotzlaw, Jörn‐Frederik; Schaltegger, Urs

doi:10.1016/j.chemgeo.2016.03.025

Cited by 26 publications

(20 citation statements)

References 43 publications

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“…No systematic effects were found outside of quoted uncertainties. We finally note that D’Abzac et al ( 49 ) reported significant impact of Yb oxides on the peak-stripped 176 Hf/ 177 Hf ratios due to the changing mass fractionation exponent, β Yb . We did not observe such effects in our analytical session and believed that this difference is attributable to the different behavior of the cones ( 53 ), as D’Abzac et al ( 49 ) used the “jet” skimmer cone, whereas we used the “x” cones.…”

Section: Methodsmentioning

confidence: 67%

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Early formation of the Moon 4.51 billion years ago

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Section: Methodsmentioning

confidence: 67%

“…Analyses were made by solution of MC-ICPMS on the ThermoFinnigan Neptune at UCLA using a Cetac “Aridus II” desolvating nebulizer. Analyses were done without matrix purification following the analytical protocol of D’Abzac et al ( 49 ). Analytical parameters were summarized in table S2, and data were presented in table S3 (A and B).…”

Section: Methodsmentioning

confidence: 99%

Early formation of the Moon 4.51 billion years ago

et al. 2017

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“…The high trace element contents results in high Yb/Hf ratios (Supplementary Data 2) and for this reason, measuring the Hf isotopic composition on the washes from U-Pb chemistry63 is not possible without purification. We used a simplified cation column chemistry procedure (similar to ref.…”

Section: Methodsmentioning

confidence: 99%

“…63. The nine Faraday cups were configured to measure the following masses at low mass resolution (m/_m ∼450): 172 (L4), 173 (L3), 175 (L2), 176 (L1), 177 (C), 178 (H1), 179 (H2), 180 (H3), 181 (H4).…”

Section: Methodsmentioning

confidence: 99%

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End-Triassic mass extinction started by intrusive CAMP activity

et al. 2017

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The end-Triassic extinction is one of the Phanerozoic's largest mass extinctions. This extinction is typically attributed to climate change associated with degassing of basalt flows from the central Atlantic magmatic province (CAMP). However, recent work suggests that the earliest known CAMP basalts occur above the extinction horizon and that climatic and biotic changes began before the earliest known CAMP eruptions. Here we present new high-precision U-Pb ages from CAMP mafic intrusive units, showing that magmatic activity was occurring ∼100 Kyr ago before the earliest known eruptions. We correlate the early magmatic activity with the onset of changes to the climatic and biotic records. We also report ages from sills in an organic rich sedimentary basin in Brazil that intrude synchronously with the extinction suggesting that degassing of these organics contributed to the climate change which drove the extinction. Our results indicate that the intrusive record from large igneous provinces may be more important for linking to mass extinctions than the eruptive record.

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Early cretaceous topographic growth of the Lhasaplano, Tibetan plateau: Constraints from the Damxung conglomerate

Wang

Garzanti

et al. 2017

JGR Solid Earth

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Constraining the timing of early topographic growth on the Tibetan plateau is critical for any models of India‐Asia collision, Himalayan orogeny and subsequent plateau development in the Cenozoic. Stratigraphic, sedimentological and provenance analysis of the Lower Cretaceous red‐beds of the Damxung Conglomerate provide new key information to reconstruct the paleogeography and the tectonic evolution of the Lhasa terrane at the time. The over 700‐m‐thick Damxung Conglomerate documents distal alluvial fan to braidplain sedimentation passing upward to proximal alluvial fan sedimentation. Deposition began near sea level, as documented by limestone beds occurring at the base of the unit. Zircon U–Pb dating of interbedded tuff layers constrain deposition age at ca. 111 Ma. Abundance of volcanic clasts, Cretaceous U–Pb ages and Hf isotopes of detrital zircons yielding mainly negative εHf(t) values together with paleocurrent data indicate an active volcanic source located in the North Lhasa subterrane. Pre‐Mesozoic‐aged zircon, recycled quartz and (meta) sedimentary rock fragments increase up‐section, indicating progressive erosional exhumation of the Paleozoic sedimentary/metasedimentary basement. The Damxung Conglomerate thus records a significant uplift and unroofing stage in the source region, implying initial topographic growth on the Lhasa terrane at early Albian time. Early Cretaceous topographic growth on the Lhasa terrane is supported by the stratigraphic record in the Linzhou basin, the Xigaze forearc basin and the southern Nima basin. In contrast, marine strata in the central‐western Lhasa terrane lasted until the early Cenomanian (ca. 96 Ma), indicating diachronous marine regression on the Lhasa terrane from east to west.

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Hf isotope analysis of small zircon and baddeleyite grains by conventional Multi Collector-Inductively Coupled Plasma-Mass Spectrometry

Cited by 26 publications

References 43 publications

Early formation of the Moon 4.51 billion years ago

Early formation of the Moon 4.51 billion years ago

End-Triassic mass extinction started by intrusive CAMP activity

Early cretaceous topographic growth of the Lhasaplano, Tibetan plateau: Constraints from the Damxung conglomerate

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