Lu-Hf Garnet Dating

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Lutetium-hafnium dating - Wikipedia
Lu-Hf garnet dating and the timing of collisions . . .
Garnet Lu-Hf dating of retrograde fluid activity during . . .
Lu-Hf and Sm-Nd dating of metamorphic garnet: evidence for . . .
(PDF) The Lu Hf dating of garnets and the ages of the . . .
The Lu-Hf dating of garnets and the ages of the Alpine . . .
In-situ Lu Hf geochronology of garnet, apatite and . . .
Lu-Hf and Sm-Nd garnet geochronology: Chronometric closure . . .
Lu-Hf Dating: The Lu-Hf Isotope System | SpringerLink
Dating the initiation of Piemonte-Liguria Ocean subduction . . .
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Dating of garnets with Lu-Hf could provide information of history of garnet growth during prograde metamorphism and peak P-T conditions . With the help of garnet Lu/Hf ages, a study on Lago di Cignana, western Alps, Italy, an age of 48 .8±2 .1 million yr for lower boundary of garnet growth time was identified .
In particular, the use of garnet Lu-Hf geochronology provides an important minimal time constraint for crustal thickening and collision . Garnet growth in the TC is constrained at 1885 ± 12 Ma ( Lu-Hf ), indistinguishable from U-Pb age of prograde monazite at 1873 ± 5 Ma . Zircon growth during melt crystallization occurred at 1848 ± 12 Ma .
The Lu-Hf age of 221 .0±2 .3 Ma marks the last garnet overgrowth episode during exhumation rather than prograde metamorphism . This somewhat restricted study suggests that dating the prograde-zoning-preserved garnets may bias results towards a particular metamorphic event rather than the prograde timing, as previously thought .
Caledonian orogenesis in Scotland is currently interpreted in terms of a Mid-Ordovician arc-continent collision (Grampian event) followed by the Silurian collision of Laurentia with Baltica (Scandian event) . Lu-Hf and Sm-Nd garnet ages of c . 475-460 Ma obtained from prograde garnets in metasedimentary successions and metabasic intrusions within the Northern Highland and Grampian . . .
Because of the high Lu/Hf ratio, Hf in garnet of even very young samples is fairly radiogenic, making Lu-Hf chronology of garnet -bearing assemblages a promising technique .The whole-rock garnet age of the Dora Maira sample is 32:8 Ϯ 1:2 Myr (Fig . 2), which compares well with earlier 35 Myr U-Pb zircon ages 15 , a Sm-Nd age of 31 .8 Myr on . . .
Eclogites from three adjacent units of the western Alps give (from bottom to top) diachronous Lu-Hf garnet ages of 32 .8 ± 1 .2, 49 .1 ± 1 .2 and 69 .2 ± 2 .7Myr . These results indicate that the . . .
Lu Hf geochronology is a powerful method to constrain the temporal evolution of geological systems . Traditional application of this dating method requires time-consuming chemical separation of the parent (176 Lu ) and daughter (176 Hf ) isotopes that is commonly accompanied by loss of textural context of the analysed minerals .In contrast, In-situ (laser-ablation based) Lu Hf geochronology offers . . .
Garnet Lu-Hf and Sm-Nd geochronology on granulite unveil chronometer systematics . • Lu-Hf dates 2 .70-Ga garnet growth, Sm-Nd dates 2 .64-Ga high-T overprinting . • Sm-Nd more susceptible to diffusion but still robust in most crustal rocks . • 176 Hf / 177 Hf potentially heterogeneous on a mineral scale down to lithospheric mantle .
Lu-Hf and Sm-Nd dating of metamorphic garnet : evidence for multiple accretion events during the Caledonian orogeny in Scotland . Journal of the Geological Society of London , 170 , 301-317 . CrossRef Google Scholar
Garnet can be dated by the 147 Sm to 143 Nd and 176 Lu to 176 Hf decay systems, where the Lu-Hf chronometer seems to be the more suitable system to date prograde metamorphism in eclogite rocks due to the higher closure temperature (Duchêne et al . 1997; Ganguly and Tirone 1999; Schmidt et al . 2011; Herwartz et al . 2008, 2011; Kirchenbaur et . . .
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Lu-Hf Garnet Dating