Precision KRbSr isotopic analysis: Application to RbSr chronology

Birck, J. L.

doi:10.1016/0009-2541(86)90111-7

Cited by 364 publications

(180 citation statements)

References 16 publications

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“…[59] Isotopic analyses were carried out using thermal ionization mass spectrometry (TIMS), on a Thermo-Finnigan Triton mass spectrometer (Open University, United Kingdom) for Sr and a VG354 at Royal Holloway University of London for Rb, in both cases using a Ta-emitter solution on zone-refined outgassed Re filaments [Birck, 1986]. Sr blanks were 31.6 and 40 pg and no blank correction was necessary; repeated analysis of SRM987 yielded 0.710280 ± 0.000010 (2 SD).…”

Section: Appendix C: Rb/sr Microsampling Methodologymentioning

confidence: 99%

Geochronological evidence for continuous exhumation through the ductile‐brittle transition along a crustal‐scale low‐angle normal fault: Simplon Fault Zone, central Alps

et al. 2010

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[1] Major low-angle normal faults juxtapose different structural levels of the crust that record both brittle and ductile deformation. Field relationships alone cannot establish whether these different responses to deformation represent (1) parts of a single process of exhumation along the detachment or (2) two separate events, with the later, more discrete brittle detachment exhuming a fossil ductile shear zone from depth. These two general models are critically assessed for the lowangle normal Simplon Fault Zone (SFZ) in the central Alps. The SFZ shows a spatial transition from a broad ductile mylonitic shear zone to a discrete brittle detachment with identical kinematics. The age of the ductile shear zone and ductile-brittle transition is controversial. We present a detailed geochronological study based on fission track, 40 Ar/ 39 Ar, and Rb/Sr microsampling dating, coupled with structural, petrological, and chemical analyses that provides tight constraints on SFZ timing. Discontinuous mineral cooling ages over a broad range of temperatures across the fault zone argue for fault activity between 20 and 3 Ma. On the basis of synkinematic white mica in low-temperature shear zones and necks of foliation boudinage, the brittle-ductile transition in the footwall could be dated at ∼14.5-10 Ma. Overall, the data presented here are consistent with a continuous transition from ductile shearing to a more localized zone of brittle deformation within the same geological framework, over a period of ∼15 Ma. The SFZ is therefore an example of a telescoped crustal section within a single major lowangle fault, involving a continuous period of exhumation rather than a two-stage structure.

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Section: Appendix C: Rb/sr Microsampling Methodologymentioning

confidence: 99%

Geochronological evidence for continuous exhumation through the ductile‐brittle transition along a crustal‐scale low‐angle normal fault: Simplon Fault Zone, central Alps

et al. 2010

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“…After evaporation to dryness, the entire procedure was repeated using 50-µl columns to further purify both the Sr and Pb eluates. For mass spectrometry, Sr was loaded with TaCl 5 -HF-H 3 PO 4 solution (Birck 1986) Pb/ 206 Pb ratios are 0.06%, 0.09%, 0.12%, 0.03% and 0.06%, respectively. Individual a priori uncertainties (2σ) are given for isotope ratios and Sr elemental concentrations (Table 2).…”

Section: Methodsmentioning

confidence: 99%

Combined Pb–Sr isotopic analysis in provenancing late Roman iron raw materials in the territory of Sagalassos (SW Turkey)

Degryse

Schneider

Muchez

2009

Archaeol Anthropol Sci

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In early Roman times, iron was likely supplied to the city of Sagalassos through the smelting of close-by hematite ores. In the early Byzantine period, magnetitetitanite placer sands in some instances could have been exploited for its iron. For the intermediate late Roman period, however, the source of the locally used iron was unknown. Pb and Sr isotopic analyses of iron ores from the area of Camoluk, just south of the territory of Sagalassos, and of late Roman iron artefacts from the antique city itself, reveal a very close resemblance. This makes the use of the Camoluk ores to supply Sagalassos with raw iron in the late Roman period likely. It is also shown that combined Pb and Sr isotopic analyses provides a powerful tool to distinguish chronological groups of iron provenance and a technique that can determine the nature and source of iron raw materials used.

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“…Approximately 200 ng of Sr was loaded onto outgassed Re filaments together with 1 µL of a TaF5 activator to enhance Sr ionisation (Birck, 1986). Strontium isotope analyses were performed on a Thermo Scientific Triton Thermal Ionisation Mass Spectrometer (TIMS) with a 5-cup Faraday multi-collector at University College Dublin (UCD).…”

Section: Timsmentioning

confidence: 99%

87Sr/86Sr and trace element mapping of geosphere-hydrosphere-biosphere interactions: A case study in Ireland

Ryan

Snoeck

Crowley

et al. 2018

Applied Geochemistry

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Precision KRbSr isotopic analysis: Application to RbSr chronology

Cited by 364 publications

References 16 publications

Geochronological evidence for continuous exhumation through the ductile‐brittle transition along a crustal‐scale low‐angle normal fault: Simplon Fault Zone, central Alps

Geochronological evidence for continuous exhumation through the ductile‐brittle transition along a crustal‐scale low‐angle normal fault: Simplon Fault Zone, central Alps

Combined Pb–Sr isotopic analysis in provenancing late Roman iron raw materials in the territory of Sagalassos (SW Turkey)

87Sr/86Sr and trace element mapping of geosphere-hydrosphere-biosphere interactions: A case study in Ireland

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