40ar 39ar termokronologi mineral detrital

  • 40Ar/39Ar Dating of Detrital Sanidine in the Goodenough

     · 40Ar/39Ar Dating of Detrital Sanidine in the Goodenough Unit Grand Mesa Colorado. Joshua Schlag 1 Andres Aslan 1 Rex Cole 1 and Matt Heizler 2. 1 Colorado Mesa University Sample preparation included sieving magnetic separations and mineral separation using lithium metatungstate. The final processing step involved hand picking

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  • The use of detrital mineral thermochronology to explore

    Detrital mineral thermochronology is explored as a tool for quantifying tectonic and geomorphic process rates at a variety of spatial and temporal scales. The assumptions upon which catchment-wide erosion rate estimates based on detrital data depend are evaluated using statistical comparisons of 40Ar/39Ar ages from Nepal and catchment area

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  • Geochronology and Thermochronology by the 40Ar/39Ar

     · Geochronology and Thermochronology by the 40 Ar/ 39 Ar Method 2nd edn by Ian McDougall and T. Mark Harrison.Oxford University Press Oxford 1999. 269 pp. ISBN . £65

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  • Estimating palaeorelief from detrital mineral age ranges

    We use the rate at which mineral age changes with elevation (its age‐gradient dt/dz) and its age range (Δt) in the sediment to invert for relief Δz=Δt/(dt/dz). Relief inversion requires a single‐grain dating precision high enough that detrital grains originate from resolvably different elevations (e.g. laser microprobe 40Ar/39Ar fusion).

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  • Comparison of Detrital Zircon U-Pb and Muscovite 40Ar/39Ar

    Detrital muscovite 40 Ar/ 39 Ar ages of the major tributaries and main trunk suggest that the Dadu River is a dominant sediment contributor to the lower Yangtze. However detrital zircon data suggest that the Yalong Dadu and Min rivers are the most important sediment suppliers.

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  • Thermal 40Ar/39Ar separation of diagenetic from detrital

     · The 40 Ar/ 39 Ar age spectra for illite-rich mixed-layered illite/smectite (I/S) from Texas Gulf Coast bentonites contain only a diagenetic component and are characteristically staircase -shaped. This spectrum shape contrasts with patterns seen for anchizonal- and epizonal-grade bentonites that are flatter. This may be due to the structural and compositional heterogeneity (mixed layering

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  • Detrital-mineral thermochronology Investigations of

    In addition detrital-mineral thermochronology can be used to extract information from the foreland stratigraphic record which extends the temporal applicability of the technique beyond traditional bedrock thermochronology. For example individual mineral grains can be extracted from a

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  • A river runs through it both ways across time 40Ar/39Ar

    Fertility or mineral abundance has a strong effect on detrital geochronology source populations. Detrital U-Pb zircon geochronology is well suited for capturing the age signatures of regional plutonism (e.g. Cawood et al. 2012 ) detrital 40 Ar/ 39 Ar muscovite geochronology is well suited for capturing the age signatures of regional

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  • 40Ar/39Ar Ages of Feldspar and Muscovite from the

     · signature of detrital muscovite mineral samples collected along the French Broad River catchment becomes dramatically more complex within lower grade rocks downstream gneiss) determined by 40Ar/39Ar incremental heating with a histogram to represent the total-gas ages of those five and an additional five single-crystal fusion ages (10

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  • A new detrital mica 40Ar/39Ar dating approach for

    A new detrital mica 40Ar/39Ar dating approach for provenance and exhumation of the Eastern Alps L. Gemignani1 Xilin Sun1 J. Braun2 3 T. D. van Gerve1 and J. R. Wijbrans1 1Department of Earth Sciences Faculty of Earth and Life Sciences Vrije Universiteit Amsterdam Amsterdam Netherlands 2GFZ DeutschesGeoForschunngZentrum Potsdam Germany 3ISTerre Université Grenoble Alpes and

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  • Downstream development of a detrital cooling-age signal

     · Laser fusion 40Ar/39Ar data for detrital muscovite collected from 12 separate sites illustrates the downstream development of a detrital age signal that is both systematic and representative of the contributing area. Over the 100-to-200-km length scale of the Marsyandi basin no significant comminution of the muscovite grains occurs.

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  • 40Ar–39Ar dating of detrital muscovite in provenance

    Detrital zircon ages are commonly used to investigate sediment provenance and supply routes. Here we explore the advantages of employing multiple complimentary techniques via a case study of the Neoproterozoic and Cambrian of the Adelaide Rift Complex South Australia. and the results of previous detrital mineral dating studies from the

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  • Estimating palaeorelief from detrital mineral age ranges

     · We use the rate at which mineral age changes with elevation (its age-gradient dt/dz) and its age range (Dt) in the sediment to invert for relief Dz=Dt/(dt/dz). Relief inversion requires a single-grain dating precision high enough that detrital grains originate from resolvably different elevations (e.g. laser microprobe 40Ar/39Ar fusion). The

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  • 40Ar–39Ar dating of detrital muscovite in provenance

    Detrital zircon ages are commonly used to investigate sediment provenance and supply routes. Here we explore the advantages of employing multiple complimentary techniques via a case study of the Neoproterozoic and Cambrian of the Adelaide Rift Complex South Australia. and the results of previous detrital mineral dating studies from the

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  • Short Paper Detrital mineral ages from the Southern

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  • Elements Magazine International Mineralogy Petrology

    Advances in detrital noble gas thermochronometry by 40Ar/39Ar and (U–Th)/He dating are improving the resolution of sedimentary provenance reconstructions and are

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  • 40Ar–39Ar dating of detrital muscovite in provenance

    Detrital zircon ages are commonly used to investigate sediment provenance and supply routes. Here we explore the advantages of employing multiple complimentary techniques via a case study of the Neoproterozoic and Cambrian of the Adelaide Rift Complex South Australia. and the results of previous detrital mineral dating studies from the

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  • eCite40Ar-39Ar dating of detrital muscovite in

    Detrital zircon ages are commonly used to investigate sediment provenance and supply routes. Here we explore the advantages of employing multiple complimentary techniques via a case study of the Neoproterozoic and Cambrian of the Adelaide Rift Complex South Australia. Detrital muscovite Ar-Ar ages are presented from stratigraphic units or equivalents that have previously been the subject

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  • Estimating palaeorelief from detrital mineral age ranges

    We use the rate at which mineral age changes with elevation (its age‐gradient dt/dz) and its age range (Δt) in the sediment to invert for relief Δz=Δt/(dt/dz). Relief inversion requires a single‐grain dating precision high enough that detrital grains originate from resolvably different elevations (e.g. laser microprobe 40Ar/39Ar fusion).

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  • "Structure detrital zircon U-Pb ages and 40Ar/39Ar

    The Early Palaeozoic Cape River Metamorphics consist mainly of psammitic gneiss and schist and occur as an extensive linear belt at the western margin of the Charters Towers Province 200 km southwest of Townsville in the northern Tasmanides. A prominent foliation (S2) is the main structure in the belt and is associated with tight to isoclinal folds subparallel mineral and intersection

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  • "Structure detrital zircon U-Pb ages and 40Ar/39Ar

    The Early Palaeozoic Cape River Metamorphics consist mainly of psammitic gneiss and schist and occur as an extensive linear belt at the western margin of the Charters Towers Province 200 km southwest of Townsville in the northern Tasmanides. A prominent foliation (S2) is the main structure in the belt and is associated with tight to isoclinal folds subparallel mineral and intersection

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  • A new detrital mica 40Ar/39Ar dating approach for

    In this paper we present new 40Ar/39Ar biotite and white mica age distributions for 19 modern river sands from the Eastern Alps north of the Periadriatic line. The results present three main clusters of ages at 0.5–50 60–120 and 250–350 Ma that record the main orogenic phases in this sector of the Alps.

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  • The use of detrital mineral cooling ages to evaluate

    Our approach is illustrated with new detrital muscovite 40Ar/39Ar dates from the Marsyandi River valley in the central Nepalese Himalaya. One of three studied catchments (Nyadi Khola) showed the strong correlation of hypsometry and cooling ages expected for steady state conditions over

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  • The use of detrital mineral cooling ages to evaluate

    Our approach is illustrated with new detrital muscovite 40Ar/39Ar dates from the Marsyandi River valley in the central Nepalese Himalaya. One of three studied catchments (Nyadi Khola) showed the strong correlation of hypsometry and cooling ages expected for steady state conditions over

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  • The exhumation history of orogenic belts from 40Ar/39Ar

    The exhumation history of mountain belts can be derived from radiometric dating of detrital mineral grains in proximal and distal post- and synorogenic sediments. The application of single-crystal dating techniques avoids the averaging effect that characterizes multi-grain and whole-rock techniques and allows the identification of populations

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  • 40Ar/39Ar ages of detrital muscovite and whole-rock slate

    Detrital muscovite concentrates from the lower anchizone are characterized by internally concordant 40Ar/39Ar age spectra which define plateau ages of ca. 350–360 Ma. These are interpreted to date post-Devonian (Acadian) cooling within proximal source areas.

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  • A new detrital mica 40Ar/39Ar dating approach for

    A new detrital mica 40Ar/39Ar dating approach for provenance and exhumation of the Eastern Alps L. Gemignani1 Xilin Sun1 J. Braun2 3 T. D. van Gerve1 and J. R. Wijbrans1 1Department of Earth Sciences Faculty of Earth and Life Sciences Vrije Universiteit Amsterdam Amsterdam Netherlands 2GFZ DeutschesGeoForschunngZentrum Potsdam Germany 3ISTerre Université Grenoble Alpes and

    Obrolan Daring