Tracking the prograde P–T path of Precambrian eclogite using Ti-in-quartz and Zr-in-rutile geothermobarometry
Tóm tắt
A Fe–Ti-rich garnet, clinopyroxene, and quartz eclogite sample from the 1.0 Ga Sveconorwegian orogen, SW Sweden, contains abundant quartz, rutile, and zircon in distinct micro-textural sites: garnet core, garnet rim, and matrix, constituting an ideal case for investigation of the behavior of Zr-in-rutile and Ti-in-quartz at high-pressure and temperature. A P–T path, peaking at 16.5–19 kbar and 850–900 °C, has been constrained independently for the same rock by pseudosection modelling; input pressures from this model were used for trace element geothermometry of each garnet micro-textural domain. Trace element thermo(baro)metry, based on in situ Secondary Ion Mass Spectrometry analyses of Ti contents in quartz and Zr contents in rutile, yields P–T estimates of progressive crystallization of quartz and rutile along the prograde metamorphic path. For inclusions in the garnet cores, Zr-in-rutile geothermometry yields 700–715 °C and Ti-in-quartz 620–640 °C at 7 kbar. For inclusions in the garnet rims, temperature estimates are 760–790 °C (Zr-in-rutile) and 740–920 °C (Ti-in-quartz) at 12–18 kbar. Finally, matrix rutile records 775–800 °C and locally ~ 900 °C, and quartz records temperatures up to 900 °C at 18 kbar. Ti-in-quartz estimates for the metamorphic peak (inclusions in the garnet rims and matrix) conform to the pseudosection, but appear too low for the early prograde stage (garnet cores), possibly due to lack of equilibrium at T < 700 °C. The pseudosection shows that rutile was produced by continuous ilmenite breakdown during the early stages of prograde metamorphism, a reaction that was completed at ~ 730 °C. Rutile grains in the garnet rims and the matrix grew subsequently larger by recrystallization of previously produced rutile. However, recrystallized rutile does not predominantly record peak temperatures, but instead yield 745–840 °C between 12 and 18 kbar. In the pseudosection, this temperature range broadly coincides with a stage during which (Ti-bearing) hornblende was consumed and clinopyroxene produced (i.e., dehydration); the Zr contents thus appear to reflect the last stage of efficient rutile recrystallization, catalysed by fluids released by the dehydration of hornblende preceding the metamorphic peak. Concurrently, combination of the isopleths for Ti content in quartz and Zr content in rutile (i.e. independent from pseudosection modelling) yields pressure and temperature conditions in almost perfect agreement with the P–T path as deduced from the pseudosection. The variation in Ti concentration in quartz is small regardless of crystal size, and the Ti-in-quartz geothermometer provides both precise and accurate peak temperatures of 875–920 °C, without a significant diffusional reequilibration. The lack of significant Ti diffusion in quartz is consistent with an inferred short residence time at high temperature. This study illustrates that Zr-in-rutile and Ti-in-quartz geothermobarometry can robustly constrain prograde P–T conditions and yield further insights into recrystallization processes at high temperature. The combination of these methods and integration of the results with pseudosection modelling is a versatile tool for investigating the petrologic history of high-grade rocks.
Tài liệu tham khảo
Ashley KT, Webb LE, Spear FS, Thomas JB (2013) P-T-D histories from quartz: a case study of the application of the Ti-in-quartz thermobarometer to progressive fabric development in metapelites. Geochem Geophys Geosyst 14(9):3821–3843
Ashley KT, Carlson WD, Law RD, Tracy RJ (2014) Ti resetting in quartz during dynamic recrystallization: mechanisms and significance. Am Miner 99(10):2025–2030
Audétat A, Garbe-Schönberg D, Kronz A, Pettke T, Rusk B, Donovan JJ, Lowers HA (2015) Characterisation of a natural quartz crystal as a reference material for microanalytical determination of Ti, Al, Li, Fe, Mn, Ga and Ge. Geostand Geoanal Res 39(2):171–184
Baldwin JA, Brown M (2008) Age and duration of ultrahigh temperature metamorphism in the Anápolis–Itauçu Complex, Southern Brasília Belt, central Brazil–constraints from U–Pb geochronology, mineral rare earth element chemistry and trace element thermometry. J Metamorph Geol 26(2):213–233
Bingen B, Skår Ø, Marker M, Sigmond EM, Nordgulen Ø, Ragnhildstveit J, Mansfeld J, Tucker RD, Liégeois JP (2005) Timing of continental building in the Sveconorwegian orogen, SW Scandinavia. Nor J Geol 85(1–2):87–116
Bingen B, Nordgulen Ø, Viola G (2008) A four-phase model for the Sveconorwegian orogeny, SW Scandinavia. Nor J Geol 88:43–72
Cherniak DJ, Watson EB, Wark DA (2007) Ti diffusion in quartz. Chem Geol 236(1):65–74
Ewing TA, Hermann J, Rubatto D (2013) The robustness of the Zr-in-rutile and Ti-in-zircon thermometers during high-temperature metamorphism (Ivrea-Verbano Zone, northern Italy). Contrib Miner Petrol 165(4):757–779
Ferry JM, Watson EB (2007) New thermodynamic models and revised calibrations for the Ti-in-zircon and Zr-in-rutile thermometers. Contrib Miner Petrol 154(4):429–437
Holland TJB, Powell R (2011) An improved and extended internally consistent thermodynamic dataset for phases of petrological interest, involving a new equation of state for solids. J Metamorph Geol 29:333–383
Huang R, Audétat A (2012) The titanium-in-quartz (Ti-in-quartz) thermobarometer: a critical examination and re-calibration. Geochim Cosmochim Acta 84:75–89
Jiao S, Guo J, Mao Q, Zhao R (2011) Application of Zr-in-rutile thermometry: a case study from ultrahigh-temperature granulites of the Khondalite belt, North China Craton. Contrib Miner Petrol 162(2):379–393
Johansson L, Möller C, Söderlund U (2001) Geochronology of eclogite facies metamorphism in the Sveconorwegian Province of SW Sweden. Precambr Res 106:261–275
Kidder S, Avouac JP, Chan YC (2013) Application of titanium-in-quartz thermobarometry to greenschist facies veins and recrystallized quartzites in the Hsüehshan range. Taiwan Solid Earth 4(1):1–21
Kohn MJ, Corrie SL, Markley C (2015) The fall and rise of metamorphic zircon. Am Miner 100(4):897–908
Kooijman E, Smit MA, Mezger K, Berndt J (2012) Trace element systematics in granulite facies rutile: implications for Zr geothermometry and provenance studies. J Metamorph Geol 30(4):397–412
Korhonen FJ, Clark C, Brown M, Taylor RJM (2014) Taking the temperature of Earth’s hottest crust. Earth Planet Sci Lett 408:341–354
Liu YC, Deng LP, Gu XF, Groppo C, Rolfo F (2015) Application of Ti-in-zircon and Zr-in-rutile thermometers to constrain high-temperature metamorphism in eclogites from the Dabie orogen, central China. Gondwana Res 27(1):410–423
Luvizotto GL, Zack T (2009) Nb and Zr behavior in rutile during high-grade metamorphism and retrogression: an example from the Ivrea–Verbano Zone. Chem Geol 261(3):303–317
Luvizotto GL, Zack T, Meyer HP, Ludwig T, Triebold S, Kronz A, Jacob DV et al (2009) Rutile crystals as potential trace element and isotope mineral standards for microanalysis. Chem Geol 261(3):346–369
Möller C (1998) Decompressed eclogites in the Sveconorwegian (–Grenvillian) orogen of SW Sweden: petrology and tectonic implications. J Metamorph Geol 16:641 656
Möller C (1999) Sapphirine in SW Sweden: a record of Sveconorwegian (–Grenvillian) late-orogenic tectonic exhumation. J Metamorph Geol 17:127–141
Möller C, Andersson J (2018) Metamorphic zoning and behaviour of an underthrusting continental plate. J Metamorph Geol 36:567–589
Möller C, Andersson J, Dyck B, Antal Lundin I (2015) Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen. Lithos 226:147–168 (Hirajama T, Medaris G (eds) High- and ultrahigh-pressure metamorphism, from microscopic to orogenic scale. Lithos (Special Issue))
Nachlas WO, Hirth G (2015) Experimental constraints on the role of dynamic recrystallization on resetting the Ti in quartz thermobarometer. J Geophys Res Solid Earth 120(12):8120–8137
Powell R, Holland TJBH., Worley B (1998) Calculating phase diagrams involving solid solutions via non linear equations, with examples using THERMOCALC. J Metamorph Geol 16:577–588
Racek M, Štípská P, Powell R (2008) Garnet–clinopyroxene intermediate granulites in the St. Leonhard massif of the Bohemian Massif: ultrahigh temperature metamorphism at high pressure or not? J Metamorph Geol 26(2):253–271
Slagstad T, Roberts NMW, Marker M, Røhr TS, Schiellerup H (2013) A non-collisional, accretionary Sveconorwegian orogen. Terra Nova 25(1):30–37
Spear FS, Wark DA (2009) Cathodoluminescence imaging and titanium thermometry in metamorphic quartz. J Metamorph Geol 27(3):187–205
Štípská P, Powell R, Racek M (2014) Rare eclogite-mafic granulite in felsic granulite in Blanský les: precursor of intermediate granulite in the Bohemian Massif? J Metamorph Geol 32(4):325–345
Taylor Jones K, Powell R (2015) Interpreting zirconium in rutile thermometric results. J Metamorph Geol 33(2):115–122
Thomas JB, Watson EB, Spear FS, Shemella PT, Nayak SK, Lanzirotti A (2010) Ti-in-quartz under pressure: the effect of pressure and temperature on the solubility of Ti-in-quartz. Contrib Miner Petrol 160(5):743–759
Thomas JB, Watson EB, Spear FS, Wark DA (2015) Ti-in-quartz recrystallized: experimental confirmation of the original Ti-in-quartz calibrations. Contrib Miner Petrol 169(3):1–16
Tomkins HS, Powell R, Ellis DJ (2007) The pressure dependence of the zirconium in rutile thermometer. J Metamorph Geol 25(6):703–713
Tual L, Pinan-Llamas A, Möller C (2015) High-temperature deformation in the basal shear zone of an eclogite-bearing fold nappe, Sveconorwegian Orogen, Sweden. Precambr Res 265:104–120 (In: Roberts N, Viola G, Slagstad T (eds) The structural, metamorphic and magmatic evolution of Mesoproterozoic orogens)
Tual L, Pitra P, Möller C (2017) P–T evolution of Precambrian eclogite in the Sveconorwegian orogen, SW Sweden. J Metamorph Geol 35(5):493–515
Walsh AK, Kelsey DE, Kirkland CL, Hand M, Smithies RH, Clark C, Howard HM (2015) P–T–t evolution of a large, long-lived, ultrahigh-temperature Grenvillian belt in central Australia. Gondwana Res 28(2):531–564
Wark DA, Watson EB (2006) TitaniQ: a titanium-in-quartz geothermometer. Contrib Miner Petrol 152(6):743–754
Watson EB, Wark DA, Thomas JB (2006) Crystallization thermometers for zircon and rutile. Contrib Miner Petrol 151(4):413–433
Zack T, Kooijman E (2017) Petrology and geochronology of rutile. Rev Mineral Geochem 83(1):443–467
Zack T, Luvizottow GL (2006) Application of rutile thermometry to eclogites. Mineral Petrol 88(1–2):69–85
Zack T, Moraes R, Kronz A (2004) Temperature dependence of Zr-in-rutile: empirical calibration of a rutile thermometer. Contrib Miner Petrol 148(4):471–488
Zhang RY, Iizuka Y, Ernst WG, Liou JG, XU ZQ, Tsujimori T, Jahn BM et al (2009) Metamorphic P–T conditions and thermal structure of Chinese Continental Scientific Drilling main hole eclogites: Fe–Mg partitioning thermometer vs. Zr in rutile thermometer. J Metamorph Geol 27(9):757–772