IUPAC-IUGS recommendation on the half life of 87Rb

Villa, Igor M.; Bièvre, Paul De; Holden, N.E.; Renne, Paul R.

doi:10.1016/j.gca.2015.05.025

Cited by 252 publications

(130 citation statements)

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“…and corrected for Rb using the equation by Banner (1995) with a decay constant λ 87 = 1.3972 ± 0.0045 · 10 -11 a -1 (Villa et al, 2015) given the geological age of 1.98 Ga. Corrected 87 Sr/ 86 Sr ratios were 0.01% -1.31% lower than the measured values.…”

Section: Accepted Manuscriptmentioning

confidence: 76%

Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals

et al. 2019

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The Paleoproterozoic Zaonega Formation in Karelia, NW Russia, has played a key role in understanding the environmental conditions postdating the Great Oxidation and Lomagundi-Jatuli Events. Its carbonate-and organic-rich rocks (shungite) define the postulated Shunga Event representing an accumulation of very organic-rich sediments at c. 2 Ga and are central in ideas about changing ocean-atmosphere composition in the wake of those worldwide biogeochemical phenomena. Our work focussed on a key interval of carbonate rocks in the upper part of the Formation to: (i) obtain new high-resolution carbon, oxygen and strontium isotope data complemented by detailed petrography and mineralogical characterisation and (ii) expand upon previous studies by using our data to constrain geochemical modelling and show in greater detail how magmatic hydrothermal fluids induced dedolomitisation and altered geochemical signals. Our findings show that the δ 13 C carb of calcite-rich intervals are the most altered, with values between -16.9 to 0.6‰, whereas the dolomite-dominated parts retain the best-preserved (i.e. most original) values. Those define a trend of steadily ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T 2increasing δ 13 C carb , from -6 to +0.5‰, which we interpret as a return to normal marine conditions and carbonate-carbon values following the Lomagundi-Jatuli Event.

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Section: Accepted Manuscriptmentioning

confidence: 76%

Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals

et al. 2019

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“…Table 1 summarizes the Rb and Sr data measured by TIMS and ICPMS. Ages were calculated using Isoplot 4.1 software [Ludwig, 1999] with the 87 Rb decay constant of 1.3972 6 0.0045 3 10 211 per year [Villa et al, 2015]. Statistical validity is verified by MSWD values less than 2.5 for all regression calculations [cf.…”

Section: Methodsmentioning

confidence: 99%

Early Miocene subduction in the western Mediterranean: Constraints from Rb-Sr multimineral isochron geochronology

Kirchner

Behr

Loewy

et al. 2016

Geochem. Geophys. Geosyst.

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The Betic Cordillera of southern Spain is a complex orogen formed in the context of convergence between Africa and Iberia from the Mesozoic to the present. The internal zone of the orogen includes three tectonic complexes, two of which have been subducted to high-pressure conditions, then exhumed back to the surface during subsequent extension. Subduction in the structurally lower complex, known as the Nevado-Filabride Complex (NFC), has been a topic of debate for several years due to conflicting geochronological data. Here we use multimineral isochron 87 Rb/ 86 Sr dating on carefully selected mineral samples from high-pressure metamorphic rocks in the NFC to better constrain the timing of high-pressure metamorphism and subduction in the region. Out of five samples analyzed, statistically valid multimineral isochrons were obtained for one eclogite and two schists, yielding ages of 20.1 6 1.1, 16.0 6 0.3, and 13.3 6 1.3 Ma, respectively. Despite that the other two eclogite samples appeared to preserve prograde mineral assemblages, low 87 Rb/ 86 Sr ratios in white mica precluded precise age calculations. These new ages are in close agreement with previously published Lu-Hf ages on garnet and U-Pb ages on metamorphic zircon overgrowths for the same rocks, but are substantially younger than published data from the 40 Ar/ 39 Ar technique. Combined with recently published tomographic images of slab structure beneath the Alboran Sea, the new ages support a tectonic model in which subduction occurred both prior to the Miocene and during the early to mid-Miocene, but that it was punctuated in time by a pulse of extensional exhumation in the early Miocene associated with lithospheric delamination and/or slab tearing.

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“…Available P–T data, together with age data from recent geochronological studies, are presented for the different nappes in the central Caledonides (Table and Figure ). Rb–Sr isotopic ages have been recalculated using the 87 Rb decay constant of Villa et al ().…”

Section: Geological Frameworkmentioning

confidence: 99%

Metamorphic Zonation by Out‐of‐Sequence Thrusting at Back‐Stepping Subduction Zones: Sequential Accretion of the Caledonian Internides, Central Sweden

et al. 2018

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Exhumation of the high-grade metamorphic Seve Nappe Complex and its emplacement between lower-grade nappes has been related to wedge extrusion in the central Scandinavian Caledonides. To test this hypothesis, the kinematic evolution of the Caledonian nappe pile is studied by systematic structural mapping in central and northern Jämtland, Sweden. Structural data, combined with petrological and quartz microstructure observations, document pervasive top-to-the-ESE, foreland-directed shearing under progressively decreasing metamorphic grade across the entire nappe pile. Mylonitic foliation, foliation-parallel boudinage, and abundant top-to-the-ESE and rare, scattered top-to-the-WNW shear-sense indicators imply foreland-directed general shear. This deformation regime caused exhumation by concurrent thrusting and vertical ductile thinning. We propose a specific succession of in-and out-of-sequence thrusts that generated the metamorphic zonation. Our model envisions in-sequence propagation of thrusts during exhumation of the Seve Nappe Complex, related to subduction of Baltica beneath a volcanic arc within Iapetus. Concurrently, Iapetus subducted beneath Laurentia farther to the west. When Iapetus was closed, Baltica subduction stepped westward and continued beneath Laurentia. The back stepping of subduction at the onset of continental collision caused out-of-sequence propagation of the orogenic wedge. Thrusting cut downsection across the existing tectonostratigraphy, emplacing units of lower metamorphic grade above the high-grade Seve Nappe Complex. This imbrication generated the present metamorphic zonation of the Caledonian nappe pile during sustained convergence between Laurentia and Baltica.

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IUPAC-IUGS recommendation on the half life of 87Rb

Cited by 252 publications

References 10 publications

Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals

Hydrothermal dedolomitisation of carbonate rocks of the Paleoproterozoic Zaonega Formation, NW Russia — Implications for the preservation of primary C isotope signals

Early Miocene subduction in the western Mediterranean: Constraints from Rb-Sr multimineral isochron geochronology

Metamorphic Zonation by Out‐of‐Sequence Thrusting at Back‐Stepping Subduction Zones: Sequential Accretion of the Caledonian Internides, Central Sweden

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