The significance of monazite U–Th–Pb age data in metamorphic assemblages; a combined study of monazite and garnet chronometry

Foster, Gavin L.; Kinny, P. D.; Vance, Derek; Prince, Christophe; Harris, Nigel

doi:10.1016/s0012-821x(00)00212-0

Cited by 294 publications

(215 citation statements)

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“…Recently, especially monazite data have proven useful in determining metamorphic and/or deformation phases (Bruguier et al, 1999;Crowley & Parrish, 1999, Foster et al, 2000, thermal history of metamorphic complexes (Aleinikoff et al, 2000;Hawkins & Bowring, 1999) or their geodynamic regime (Vavra & Schaltegger, 1999). One reason for the increased utility of monazite in geochronology of high-grade rocks is that monazite is apparently not reset and annealed as easily as earlier thought and may resist fluids even more efficiently than zircon (Parrish & Whitehouse, 1999;Schaltegger et al, 1999;Vavra & Schaltegger, 1999).…”

Section: Introductionmentioning

confidence: 99%

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Tuisku¹,

Huhma²

2006

Bull Geol Soc Finland

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The migmatitic metapelites of the Lapland granulite belt (LGB) in the NE part of the Fennoscandian Shield represent an arc-related greywacke basin metamorphosed in the granulite facies. Detrital zircons from migmatitic metapelites are derived from 1.94 etrital zircons from migmatitic metapelites are derived from 1.94 zircons from migmatitic metapelites are derived from 1.94 derived from 1.94 − 2.9 Ga old acid source rocks (U-Pb SIMS ages). The clustering of detrital zircon ages between 1.97 and 2.2 Ga is problematic, because abundant felsic crust of this age is absent in the shield. The metasediments are characterized by Sm-Nd model ages of ca. 2.3 Ga. A younger, 1905 − 1880 Ma population of homogeneous zircons was formed during regional metamorphism. The peak high-grade metamorphism took place at ~1900 Ma and the latest chronological record from subsequent decompression and cooling phase is from ca. 1870 Ma. The norite-enderbite series of the LGB represents arc-magmas, which were intruded into the metasediments at ~1920 − 1905 Ma ago according to zircon U-Pb ages and were probably an important heat source for metamorphism. Older, zoned zircon grains in a quartz norite vein, initial ε Nd values of 0 to +1 and the continuous spectrum of LILE enrichment in the enderbite-series probably reflect assimilation of metasediments by magmas. Monazite U-Pb ages of migmatitic metasediments in the range 1906 − 1910 ± 3 Ma overlap the late stage of enderbite intrusion and growth of early metamorphic zircons. Garnetwhole rock Sm-Nd ages from leucosomes in the range 1880 − 1886 ± 7 Ma are concurrent with the growth of the youngest metamorphic zircons and probably indicate the crystallization of leucosomes or the influence of a fluid liberated from them. Isotopic and petrologic data reveal that the evolution of Lapland Granulite belt from the erosion of source rocks to the generation of a sedimentary basin, its burial, metamorphism and exhumation took place within ca. 60 Ma.

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Section: Introductionmentioning

confidence: 99%

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Tuisku¹,

Huhma²

2006

Bull Geol Soc Finland

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“…Vavra 1993). More recently, the advent of in-situ isotopic analysis using high mass resolution ion microprobes has allowed the harnessing of other types of textural information, for example, the simple observation that accessory mineral inclusions in major phases like garnet must mean that the accessory phases are older (Harrison et al 1995;Zhu et al 1997;Foster et al 2000). However, the possibility of inheritance, for zircon in particular (Gulson & Krogh 1973) but also for monazite (Parrish 1990), may render such an observation of dubious value.…”

Section: Improving the Link Between Accessory Phase Chronometers And mentioning

confidence: 99%

“…The first is relevant to monazite and has involved attempts to exploit empirical and experimental constraints on the relationship between its temperature of growth and the partitioning of REE between monazite and other accessory minerals (xenotime: Gratz & Heinrich 1997, 1998Heinrich et al 1997;Foster & Parrish 2003) or between monazite and garnet (Pyle & Spear 2000;Pyle et al 2001). The second is relevant to both monazite (Pyle & Spear 1999;Foster et al 2000;Foster & Parrish 2003) and zircon Rubatto 2002;Whitehouse & Platt 2003;Whitehouse 2003) and involves the examination of those aspects of the chemistry of major mineralsnamely their trace element chemistry -that do link to aspects of the chemistry of the accessory minerals. All these approaches -textural and chemical -are utilized by work reported in this volume.…”

Section: Improving the Link Between Accessory Phase Chronometers And mentioning

confidence: 99%

“…Pyle & Spear 1999;Foster et al 2000;Pyle et al 2001;Rubatto 2002). In that case, the yttrium content of monazite can also be used for the determination of the growth conditions of monazite by linking it with the growth history of garnet.…”

Section: Improving the Link Between Accessory Phase Chronometers And mentioning

confidence: 99%

“…While uncertainties remain over the extent to which ages of matrix monazite not armoured by occluding garnet reflect growth of new monazite (e.g. Cocherie et al 1998;Vavra & Schaltegger 1999;Foster et al 2000) or diffusive lead loss (e.g. Carlos et al 2002), this general approach has huge potential for the future.…”

Section: Improving the Link Between Accessory Phase Chronometers And mentioning

confidence: 99%

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Geochronology: linking the isotopic record with petrology and textures — an introduction

Vance

Müller

Villa³

2003

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Abstract:One of the key aims of geochronology, and the subject of the papers in this Special Publication, is the linkage of isotopic ages to petrological and textural information. A close link between the two types of information greatly improves the constraints available from geochronology on the nature and rates of lithospheric processes such as metamorphism and deformation. There have been several key advances in this area over the past 10-20 years, relating to increased precision and accuracy of isotopic ages but also, and crucially, to the spatial resolution available to geochronologists. This resolution now approaches that on which petrological, chemical and textural information is obtained. We also, in this introduction, identify the barriers that have impeded further progress, which relate both to technical issues as well as to problems of understanding. Finally we set the papers in this volume in the context of the preceding discussion and outline the key ways in which these papers point towards further progress in the future.Time has always been recognized as a key variable in the Earth sciences, both in its own right and through the constraints that chronological information provides on the rates of, and hence the physical mechanisms for, Earth processes. In the study of the dynamics of the Earth's lithosphere during orogenesis and metamorphism, one of the key requirements of any time datum is that it is relatable in a straightforward manner to other geological information, such as data on temperature, pressure and deformation. It is only through this linkage that chronometric information can achieve its full potential in contributing to progress in understanding the dynamics of mountain belts and other metamorphic settings. This linkage is the focus of the set of papers in this volume, which emanate from a special symposium at the 2002 Goldschmidt Conference, held at Davos, Switzerland. The topic under discussion has been the subject of a review by one of us recently (Mtiller 2003). Inevitably, there is some overlap between this paper and Miiller (2003). However, the emphasis of the two papers is slightly different, with Mtiller (2003) concentrating largely on new in-situ techniques and their resulting prospects, whereas here we give a broader overview of the whole subject, with more emphasis on the dating of high temperature processes and the interrelated achievements of both modelling and experimental work in petrology. We also aim to highlight some general issues that are dealt with in specifics in the subsequent contributions. First, we give a brief account of the progress that has been made over the past two decades in our ability to extract the timing and conditions of deformation and metamorphism from minerals and in the interpretive framework in which these new data are analysed. Next we identify three key barriers that initially impeded further progress and which have been and continue to be the subjects of intensive research eflbrt. Finally, we discuss ways that are being developed to surm...

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Simultaneous in situ determination of U‐Pb and Sm‐Nd isotopes in monazite by laser ablation ICP‐MS

Goudie

Fisher

Hanchar

et al. 2014

Geochem Geophys Geosyst

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Results are presented for in situ simultaneous determination of U-Pb and Sm-Nd isotopes in monazite using the Laser Ablation Split-Stream (LASS) method. This method uses a laser ablation system coupled to a magnetic-sector inductively coupled plasma mass spectrometer (HR) (ICP-MS) for measuring U-Pb isotopes and a multicollector (MC) ICP-MS for measuring Sm-Nd isotopes. Ablated material is split using a Y-connector and transported simultaneously to both mass spectrometers. In addition to Sm and Nd isotopes, the MC-ICP-MS is configured to also acquire Ce, Nd, Sm, Eu, and Gd elemental abundances. This approach provides age, tracer isotope, and trace element data in the same ablation volume, reducing sampling problems associated with fine-scale zoning in accessory minerals and minimizing the material needed for ablation. Precision and accuracy of the U-Pb method (and the precision of the Sm-Nd method) is demonstrated with results from well-characterized monazite reference materials. The LASS results agree within uncertainty with the isotope dilution thermal ionization mass spectrometry (ID-TIMS) U-Pb dates. The accuracy of the Sm-Nd method is assessed by comparing the LA-MC-ICP-MS results with ID-TIMS determinations on a well-characterized, in-house monazite reference material. The LASS method is then applied to monazite from the Birch Creek Pluton in the White Mountains of California as a case study to illustrate the utility of this method for solving geologic problems. The U-Pb ages and Sm-Nd isotopic data from the LASS method support the conclusions drawn from previous results that monazite can record timing and information about the source region(s) of hydrothermal fluids.

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The significance of monazite U–Th–Pb age data in metamorphic assemblages; a combined study of monazite and garnet chronometry

Cited by 294 publications

References 36 publications

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Evolution of migmatitic granulite complexes: Implications from Lapland Granulite Belt, Part II: Isotopic dating

Geochronology: linking the isotopic record with petrology and textures — an introduction

Simultaneous in situ determination of U‐Pb and Sm‐Nd isotopes in monazite by laser ablation ICP‐MS

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