Time constraints on deformation and metamorphism from EPMA dating of monazite in the Proterozoic Robertson River Metamorphics, NE Australia

Cihan, M.; Evins, Paul M.; Lisowiec, Nicholas; Blake, Kevin

doi:10.1016/j.precamres.2005.11.009

Cited by 45 publications

(59 citation statements)

References 42 publications

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“…15f). The Etheridge Province similarly experienced polyphase deformation and metamorphism, the Ewanin orogeny, between about 1620 and 1550 Ma, which included initial east-west shortening (Cihan et al, 2006). This protracted period of orogenesis was accompanied the emplacement of voluminous granitic plutons, resulting in the upper crustal architecture now shown across the Mount Isa Province, Kowanyama Seismic Province and Etheridge Province (Fig.…”

Section: -1500 Mamentioning

confidence: 96%

“…The Isan Orogeny at 1600 Ma to 1500 Ma inverted at least the youngest of the three basinal developments and has widespread expression across the province, with a complex history involving both north-south and east-west shortening (O'Dea et al, 1997;Blenkinsop et al, 2008). The Etheridge Province also records multiphase deformation and metamorphism between 1620 Ma and 1550 Ma (Withnall et al, 1997;Cihan et al, 2006;Withnall et al, 2009) (Glikson and Derrick, 1978;Wilson, 1978).…”

Section: Eastern Boundary Of Mount Isa Province (Gidyea Suture Zone)mentioning

confidence: 99%

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Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

et al. 2012

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Section: -1500 Mamentioning

confidence: 96%

Section: Eastern Boundary Of Mount Isa Province (Gidyea Suture Zone)mentioning

confidence: 99%

Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

et al. 2012

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“…However, deformation is also known to play a vital role in formation of different minerals, particularly porphyroblastic phases (e.g., Bell 1986;Williams 1994;Cihan et al 2006) through its control on sites for the access of nutrients needed for nucleation and growth (Spiess and Bell 1996). The FIA controlled monazite dating described herein reveals ∼90 million years of continuous deformation/metamorphism followed by ∼250 million years of quiescence before orogenesis recommenced for ∼20 million years with little or no change in PT conditions (Shah 2010).…”

Section: Role Of Deformation and Its Significance For Porphyroblast Gmentioning

confidence: 86%

“…Geologically significant age information can be derived by assuming low amounts of common Pb (e.g., Parrish 1990; Gaidies et al 2008) and slow diffusion rates for Th, U and Pb in monazite (Cherniak et al 2004). The samples were chosen based on FIA set and the grains were isolated and clustered according to their age, textural setting and whether any chemical zonation was present (Cihan et al 2006). This would potentially reduce any error and make the age information reliable (Montel et al 1996;Pyle et al 2005;Gaidies et al 2008).…”

Section: Dating Of Fia Setsmentioning

confidence: 99%

“…The integration of detailed microstructural studies and FIA data with garnet isopleth thermobarometry/MnNCKFMASH pseudosection construction can provide complete pressure-temperaturetime deformational trajectories of an area (e.g., Kim and Bell 2005;Cihan et al 2006;Sayab 2006;Ali 2010). Such an approach significantly improves our understanding of large-scale orogenic processes.…”

Section: Introductionmentioning

confidence: 99%

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Ninety million years of orogenesis, 250 million years of quiescence and further orogenesis with no change in PT: Significance for the role of deformation in porphyroblast growth

Shah

Bell

2012

J Earth Syst Sci

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In situ dating of monazite grains preserved as inclusions within foliations defining FIAs (foliation inflection/intersection axes preserved within porphyroblasts) contained within garnet, staurolite, andalusite and cordierite porphyroblasts provides a chronology of ages that matches the FIA succession for the Big Thompson region of the northern Colorado Rocky Mountains. FIA sets 1, 2 and 3 trending NE-SW, E-W and SE-NW were formed at 1760.5 ± 9.7, 1719.7 ± 6.4 and 1674 ± 11 Ma, respectively. For three samples where garnet first grew during just one of each of these FIAs, the intersection of Ca, Mg, and Fe isopleths in their cores indicate that these rocks never got above 4 kbars throughout the Colorado Orogeny. Furthermore, they remained around approximately the same depth for ∼250 million years to the onset of the younger Berthoud Orogeny at 1415 ± 16 Ma when the pressure decreased slightly as porphyroblasts formed with inclusion trails preserving FIA set 4 trending NNE-SSW. No porphyroblast growth occurred during the intervening ∼250 million years of quiescence, even though the PT did not change over this period. This confirms microstructural evidence gathered over the past 25 years that crenulation deformation at the scale of a porphyroblast is required for reactions to re-initiate and enable further growth.

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The use of garnet porphyroblasts to resolve the metamorphic pressure-temperature-deformation (P-T-d) path: An example from the Imjingang belts, South Korea

Kim

Jung

2010

Geosci J

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S: Quantitative P−T−deformation path determination for metamorphic rocks can be revealed by an approach combined isopleths intersection of zoned garnet compositions with foliation intersection/inflexion axes (FIAs) preserved within the garnet porphyroblast. The method presented here is applied to metapelites in the Jingok Unit of the Imjingang belt, South Korea. Garnet and staurolite FIA trends are E−W to WNW−ESE (90−120°) and NE−SW to ENE−WSW (50−80°), respectively. The FIA data indicate that garnet porphyroblasts have grown under N−S to NNE−SSW bulk shortening. P−T paths for garnet growth in Grt, St and Ky zone in the Jingok Unit, calculated from geothermobarometers and the intersection of isopleths on P−T pseudosections in the MnO−Na 2 O−CaO−K 2 O−FeO−MgO−Al 2 O 3 −SiO 2 −H 2 O (MnNCK-FMASH) system constructed using program THERMOCALC, are compressional heating from 545°C at 5.3 kbar to 610−640°C at 7.9−8.8 kbar. All compositional and microtextural data and thermodynamic modeling indicate that garnet porphyroblasts have formed during compressional heating under N−S crustal shortening, whereas staurolite porphyroblasts have formed dominantly during sub-isothermal decompression with overgrowing NE/ENE FIA. Consequently, the metapelites in the Jingok Unit have experienced clockwise P−T path derived from Barrovian-type metamorphism belong in amphibolites facies.

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Time constraints on deformation and metamorphism from EPMA dating of monazite in the Proterozoic Robertson River Metamorphics, NE Australia

Cited by 45 publications

References 42 publications

Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

Crustal architecture and geodynamics of North Queensland, Australia: Insights from deep seismic reflection profiling

Ninety million years of orogenesis, 250 million years of quiescence and further orogenesis with no change in PT: Significance for the role of deformation in porphyroblast growth

The use of garnet porphyroblasts to resolve the metamorphic pressure-temperature-deformation (P-T-d) path: An example from the Imjingang belts, South Korea

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