Low-temperature alteration of monazite: Fluid mediated coupled dissolution–precipitation, irradiation damage, and disturbance of the U–Pb and Th–Pb chronometers

Seydoux‐Guillaume, Anne‐Magali; Montel, Jean-Marc; Bingen, Bernard; Bosse, Valérie; Parseval, Philippe de; Paquette, Jean‐Louis; Janots, Émilie; Wirth, Richard

doi:10.1016/j.chemgeo.2012.07.031

Cited by 183 publications

(95 citation statements)

References 78 publications

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“…DeWolf et al, 1993;Teufel and Heinrich, 1997;Zhu et al, 1997;Townsend et al, 2000;Seydoux-Guillaume et al, 2002;Zeh et al, 2003;Budzy n et al, 2011;Harlov et al, 2011;Williams et al, 2011;Janots et al, 2012;Kelly et al, 2012;Ondrejka et al, 2012;Seydoux-Guillaume et al, 2012;Sindern et al, 2012;Upadhyay and Pruseth, 2012;Didier et al, 2013). Zircon UePb systematics can also be affected by (latestage) fluid that induces dissolution and reprecipitation (e.g.…”

Section: Timescales and Geochronometersmentioning

confidence: 92%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

376

285

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a b s t r a c tUltrahigh temperature (UHT) metamorphism is the most thermally extreme form of regional crustal metamorphism, with temperatures exceeding 900 C. UHT crustal metamorphism is recognised in more than 50 localities globally in the metamorphic rock record and is accepted as 'normal' in the spectrum of regional crustal processes. UHT metamorphism is typically identified on the basis of diagnostic mineral assemblages such as sapphirine þ quartz, orthopyroxene þ sillimanite AE quartz and osumilite in MgeAlrich rock compositions, now usually coupled with pseudosection-based thermobarometry using internally-consistent thermodynamic data sets and/or Al-in-Orthopyroxene and ternary feldspar thermobarometry. Significant progress in the understanding of regional UHT metamorphism in recent years includes: (1) development of a ferric iron activityecomposition thermodynamic model for sapphirine, allowing phase diagram calculations for oxidised rock compositions; (2) quantification of UHT conditions via trace element thermometry, with Zr-in-rutile more commonly recording higher temperatures than Ti-in-zircon. Rutile is likely to be stable at peak UHT conditions whereas zircon may only grow as UHT rocks are cooling. In addition, the extent to which Zr diffuses out of rutile is controlled by chemical communication with zircon; (3) more fully recognising and utilising temperature-dependent thermal properties of the crust, and the possible range of heat sources causing metamorphism in geodynamic modelling studies; (4) recognising that crust partially melted either in a previous event or earlier in a long-duration event has greater capacity than fertile, unmelted crust to achieve UHT conditions due to the heat energy consumed by partial melting reactions; (5) more strongly linking UePb geochronological data from zircon and monazite to PeT points or path segments through using Y þ REE partitioning between accessory and major phases, as well as phase diagrams incorporating Zr and REE; and (6) improved insight into the settings and factors responsible for UHT metamorphism via geodynamic forward models. These models suggest that regional UHT metamorphism is, principally, geodynamically related to subduction, coupled with elevated crustal radiogenic heat generation rates.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Timescales and Geochronometersmentioning

confidence: 92%

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

Kelsey

Hand

2015

Geoscience Frontiers

376

285

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“…The only distinction of the BSE-bright zones relative to BSE-dark ones is the enrichment in light-and especially heavyrare earth elements, and Th, U and Pb. Numerous studies have shown that zones affected by post-magmatic fluid alteration display a distinct chemical pattern, distinguishable from the domains formed at the magmatic stage and therefore allowing a straightforward location on binary diagrams (Poitrasson et al 2000;Harlov et al 2002;Williams et al 2011;Seydoux-Guillaume et al 2012). Unfortunately no measurement spots were located in thin BSE-dark domains near the cracks, so the nature of element depletion is unknown.…”

Section: Textures and Chemical Composition Of Monazitementioning

confidence: 99%

“…Such case could be explained by fluid-aided removal of Th from the grain margin, but, as in the previous example, there is not sufficient evidence to confirm or exclude this suggestion. Selective leaching of Th, U or Pb by hydrothermal fluids may disturb the Th-U-Pb system and, therefore, yield an unrealistic age or even totally reset the Th-U-Pb clock (Bosse et al 2009;Williams et al 2011;Seydoux-Guillaume et al 2012). The domains which are texturally suspected of being altered by postmagmatic fluids include BSE-dark cracks and some lobate grain margins.…”

Section: Monazite Agesmentioning

confidence: 99%

U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany

Lisowiec¹,

Budzyń²,

Słaby³

et al. 2014

Acta Geologica Polonica

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ABSTRACT:Lisowiec, K., Budzyń, B., Słaby, E., Schulz, B., and Renno, A.D. 2014. Th-U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany. Acta Geologica Polonica, 64 (4), 457-472. Warszawa.Monazite from the Stolpen monzogranite (SE Germany) was studied to constrain the Th-U-total Pb age of pluton formation. Monazite grains demonstrate subtle to distinct patchy zoning related to slight compositional variations. Textural and compositional characteristics indicate that the monazite formed in a single magmatic event in a slightly heterogeneous system, and was only weakly affected by secondary alteration, which did not disturb the Th-U-Pb system. Chemical dating of the monazite gave a consistent age of 299 ± 1.7 Ma. The current study presents the first geochronological data for the Stolpen granite. It provides evidence that Stolpen is the youngest Variscan granitic intrusion in the Lusatian Granodiorite Complex and indicates that magmatic activity related to post-collisional extension in this region lasted at least 5my longer than previously assumed.

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“…Electron microprobe analyses of major and minor elements were collected in eleven zircon crystals included in feldspar and xenotime in two polished thin sections (online Appendix 1; method description in Seydoux-Guillaume et al, 2012). They show deficient totals (80-99 wt%), low ZrO 2 contents (<66 wt%), and anticorrelation between ZrO 2 and U, Th, Y, P, Ca or Fe ( Fig.…”

Section: Sample and Resultsmentioning

confidence: 99%

“…Uranium-lead isotopic analyses were performed by LA-ICP-MS in nine zircon crystals, all but one of them previously analyzed by electron microprobe (online Appendix 2; method description in Seydoux-Guillaume et al, 2012 andPaquette et al, 2014). In the Tera-Wasserburg diagram (Fig.…”

Section: Sample and Resultsmentioning

confidence: 99%

Nanoscale evidence for uranium mobility in zircon and the discordance of U–Pb chronometers

Seydoux‐Guillaume

Bingen

Paquette

et al. 2015

Earth and Planetary Science Letters

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Low-temperature alteration of monazite: Fluid mediated coupled dissolution–precipitation, irradiation damage, and disturbance of the U–Pb and Th–Pb chronometers

Cited by 183 publications

References 78 publications

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings

U-total Pb timing constraints on the emplacement of the granitoid pluton of Stolpen, Germany

Nanoscale evidence for uranium mobility in zircon and the discordance of U–Pb chronometers

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