Textural, chemical and isotopic insights into the nature and behaviour of metamorphic monazite

Foster, Gavin L.; Gibson, H. Daniel; Parrish, R. R.; Horstwood, Matthew; Fraser, James E.; Tindle, A. G.

doi:10.1016/s0009-2541(02)00156-0

Cited by 226 publications

(166 citation statements)

References 38 publications

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“…As the amount of Y 2 O 3 that can be integrated in rare earth phosphate highly depends on the environment crystallization of the monazite grain, this parameter can be used for characterizing multiple populations. Temperature but also garnet chemical behaviour can influence this parameter ( [Foster et al, 2002] and [Pyle et al, 2001]). …”

Section: Y2o3 Contentmentioning

confidence: 99%

“…In biotite gneisses, monazites have clearly a metamorphic origin. Those grains generally crystallize under amphibolite facies conditions, corresponding to metamorphic peak conditions or early portion of retrograde path ( [Bingen et al, 1996] and [Foster et al, 2002]). In sample WU816, A-type monazites are anhedral grains or occur in core of hybrid grains.…”

Section: Age Significancementioning

confidence: 99%

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Structural development of the Lower Paleozoic belt of South China: Genesis of an intracontinental orogen

Charvet

Shu

Faure

et al. 2010

Journal of Asian Earth Sciences

375

250

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An extensive structural study of Wuyishan and surrounding areas (South China) brings data on the structures formed prior to the Devonian unconformity, building the Lower Paleozoic belt. An Ordovician tectonic event was responsible for: (i) south-directed structures in the Wuyishan proper and its southern border, related to both thin and thick-skinned tectonics, accompanied by metamorphism and crustal thickening; (ii) north-directed structures to the west of Ganjiang Fault and north of Jiangshan-Shaoxing Fault, where only thin-skinned tectonics is visible. The southward deformation accommodating the shortening includes emplacement of thrust sheets, involving deep crustal material and some mantle peridotite, and likely repetition of continental material, both responsible for crustal thickening. The orogeny was due to the underthrusting of the southern part of the South China Block beneath the northern part of this block, closing the pre-existing Nanhua rift, created at around 850-800 Ma, and involving the rift sedimentary fill in the southward thrusting. The synmetamorphic tectonic piling was followed by anatexis and granite emplacement at around 440-390 Ma. Our new U-Th-Pb EPMA monazite dating gives ages of 433 ± 9 Ma and 437 ± 5 Ma (Early Silurian) for the main anatectic event, and a younger age of 412 ± 5 Ma (Late Silurian-Early Devonian) for a late re-heating process. The Lower Paleozoic belt is an intracontinental orogen, without oceanic suture record. It shows some similarities with the Cenozoic European Pyrénées Chain, with a strong asymmetry.

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Section: Y2o3 Contentmentioning

confidence: 99%

Section: Age Significancementioning

confidence: 99%

Structural development of the Lower Paleozoic belt of South China: Genesis of an intracontinental orogen

Charvet

Shu

Faure

et al. 2010

Journal of Asian Earth Sciences

375

250

View full text Add to dashboard Cite

show abstract

“…Furthermore, as monazite crystallisation occurs at approximately P -T conditions near that of the staurolite isograd (Smith & Barreiro 1990), chemical ages can potentially be linked to the timing of metamorphic mineral growth, and a P -T -t path can be interpreted for the host rock (Foster et al 2000(Foster et al , 2002(Foster et al , 2004Foster & Parrish 2003;Fitzsimons et al 2005).…”

Section: Monazite Systematics and Age Determinationmentioning

confidence: 99%

Timing of Proterozoic metamorphism in the southern Curnamona Province: implications for tectonic models and continental reconstructions ∗

Rutherford

Hand

Barovich

2007

Australian Journal of Earth Sciences

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Chemical U -Th -Pb monazite ages from metasedimentary and meta-igneous units of the Willyama Supergroup have confirmed initial SHRIMP U -Pb metamorphic zircon ages constraining the onset of the earliest tectonometamorphic event (the Olarian Orogeny) at ca 1610 Ma in the southern Curnamona Province. An additional episode of high-grade metamorphism and heterogeneously distributed retrograde metamorphism and monazite recrystallisation occurred between ca 1570 and 1550 Ma. On the basis of monazite chemical U -Th -Pb ages from across the southern Curnamona Province, tectonometamorphic models based on ca 1690 Ma low-P, high-T metamorphism in the southern Curnamona Province are not supported. Furthermore, tectonic reconstructions that rely on the correlation of ca 1690 Ma deformation and metamorphism in the Broken Hill region with a similar aged event in the Mojave tarrane of southwestern Laurentia (AUSWUS) are not supported.

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“…The closure temperature of monazite is estimated at 725±25°C [52,56], in excess of 750°C [57] or 900°C [58]. This suggests that crystallization ages will be preserved during metamorphism [59,60]. The magmatic temperatures for the Himalaya leucogranites are likely no higher than ~650-750°C [61][62][63][64], meaning that the closure temperature is well above the crystallization temperature with limited diffusion of Pb in monazite and/or zircon [48,65,66] except huge fluid interactions.…”

Section: Results and Analysis Of Monazite-zircon U-th/pb Agesmentioning

confidence: 99%

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

Liu

Leloup

et al. 2012

Chin. Sci. Bull.

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The South Tibet Detachment System (STDS) is a flat normal fault that separates the Upper Himalaya Crystalline Sequence (UHCS) below from the Tethyan Sedimentary Sequence (TSS) above. Timing of deformations related to the STDS is critical to understand the mechanism and evolution of the Himalaya collision zone. The Nyalam detachment (ND) (~86°E) locates in the middle portion of STDS (81°-89°E). Dating of deformed leucocratic dykes that are most probably syntectonic at different depth beneath the ND, allow us to constrain the timing of deformation. (1) Dyke T11N37 located ~3500 m structurally below the ND emplaced at 27.4± 0.2 Ma; (2) Dyke T11N32 located ~1400 m structurally below the ND emplaced at 22.0±0.3 Ma; (3) T11N25 located within the top to the north STD shear zone, ~150 m structurally below the ND, emplaced at 17.1±0.2 Ma. Combining ND footwall cooling history and T11N25 deformation temperature, we indicate a probable onset of top to the north deformation at ~16 Ma at this location. These results show an upward younging of the probable timing of onset of the deformation at different structural distance below the ND. We then propose a new model for deformation migration below the ND with deformation starting by pure shear deformation at depth prior to ~27.5 Ma that migrates upward at a rate of ~ 0.3 mm/a until ~18 Ma when deformation switches to top to the north shearing in the South Tibet Detachment shear zone (STDsz). As deformation on the ND stops at 14-13 Ma this would imply that significant top to the North motion would be limited to less than 5 Ma and would jeopardize the importance of lower channel flow.

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Textural, chemical and isotopic insights into the nature and behaviour of metamorphic monazite

Cited by 226 publications

References 38 publications

Structural development of the Lower Paleozoic belt of South China: Genesis of an intracontinental orogen

Structural development of the Lower Paleozoic belt of South China: Genesis of an intracontinental orogen

Timing of Proterozoic metamorphism in the southern Curnamona Province: implications for tectonic models and continental reconstructions ∗

Ductile deformation within Upper Himalaya Crystalline Sequence and geological implications, in Nyalam area, Southern Tibet

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