High-precision UPb ages of metamorphic rutile: application to the cooling history of high-grade terranes

Eventos De Cisalhamento E Mineralização Aurífera Na Região Nordeste Do Quadrilátero Ferrífero: Considerações Baseadas Em Análises U-Pb De Rutilo E Titanita

“…Rutilo metamórfico tem sido descrito em uma grande variedade de litotipos, abrangendo praticamente todos os graus metamórficos (Mezger et al, 1989). Quando comparado com outros minerais, como zircão, monazita e titanita, a utilização do rutilo em estudos geocronológicos U-Pb é relativamente rara na literatura geológica.…”

Thermochronology; applications to tectonics, petrology, and stratigraphy

“…Armstrong (1966) and Harper (1967) initially developed the concept, and its general acceptance has followed from the observations of Hart (1964), Hanson and Gast (1967), Purdy and Jager (1976), , and Mezger et al 1989 presented the mathematical foundation for the closuretemperature concept which is illustrated in Figure 2.…”

UPb LA-(MC)-ICP-MS dating of rutile: New reference materials and applications to sedimentary provenance

“…U-Pb dates obtained for rutile are younger than coexisting zircon and represent the time of cessation of Pb volume diffusion during cooling below ~ 500 ºC; rutile can thus be used as a thermochronometer in studies aimed at constraining the timing of metamorphism or the thermal evolution of igneous and metamorphic terranes (Schärer et al, 1986;Corfu and Muir, 1989;Mezger et al, 1989;Flowers et al, 2005;2006;Storey et al 2007;Kylander-Clark et al, 2008;Li et al, 2011;Blackburn et al, 2011Blackburn et al, , 2012. Growing interest is also being paid to U-Pb chronology of detrital rutile as a provenance indicator (Allen and Campbell, 2007;Birch et al, 2007;Rösel et al, 2011;Meinhold et al, 2011;Okay et al, 2011).…”

“…Growing interest is also being paid to U-Pb chronology of detrital rutile as a provenance indicator (Allen and Campbell, 2007;Birch et al, 2007;Rösel et al, 2011;Meinhold et al, 2011;Okay et al, 2011). While U-Pb chronology of rutile by ID-TIMS is a well established technique and allows high precision ratios to be measured (e.g., Ludwig and Cooper, 1984;Schärer et al, 1986;Corfu and Andrews, 1986;Mezger et al, 1989;Davis, 1997;Cox et al, 2002;Treloar et al, 2003;Schmitz and Bowring, 2003), rutile can also be dated by microprobe (secondary ion mass spectrometry -SIMS, LA-ICP-MS) techniques (Sircombe, 1995;Clark et al, 2000;Vry and Baker, 2006;Harrison et al, 2007;Storey et al, 2007;Kooijman et al, 2010;Meinhold et al, 2011;Schmitt and Zack, 2012;Taylor et al, 2012).…”

“…T C is a function of diffusivity, cooling rate, and effective diffusion radius. Mezger et al (1989) used ID-TIMS to date rutile grains from amphibolite to granulite facies metapelitic rocks, and compared the results to dates obtained for other minerals with reasonably well-known T C (zircon, garnet, sphene, monazite, as well as hornblende and biotite dated by the K-Ar and 40 Ar/ 39 Ar method). This empirical calibration resulted in T C estimates for rutile of 380 and 420 °C depending on grain size of crystals (respectively 70-90 and 90-210 m).…”