Correlations between chemical and age domains in monazite, and metamorphic reactions involving major pelitic phases: an integration of ID-TIMS and SHRIMP geochronology with Y–Th–U X-ray mapping

Gibson, H. Daniel; Carr, Sharon D.; Brown, Richard L.; Hamilton, Michael A.

doi:10.1016/j.chemgeo.2004.06.028

Cited by 150 publications

(125 citation statements)

References 59 publications

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“…However, Gibson et al [43] documented monazite rims with higher Y content than the interior of the monazite, and they interpret the zones of relative depletion or enrichment of Y in these metapelitic monazite crystals as being controlled by reactions involving production and consumption of associated garnet. In our case, monazite inclusions in the garnet core have Y 2 O 3 contents ranging from 0.853 to 1.279 wt%, with average of 1.01 ± 0.09 wt%; those enclosed in the garnet rim, kyanite, plagioclase and quartz, and those in the matrix are in range from 0.188 wt% to 0.857 wt%, clustering between 0.385 and 0.651 wt% with average of 0.48 ± 0.10 wt% ( Figure 3).…”

Section: Two Generation Monazites and Two Metamorphic Eventsmentioning

confidence: 96%

“…Therefore, the variation in Y has been used to study the monazite generations and constrain their relationship with the garnet generations [41][42][43] , and consequently to link the monazite chemical age to the growth of the garnet and its associated major phases. Generally, early generation monazite contains higher Y content than the late generation while growing in equilibrium with garnet.…”

Section: Two Generation Monazites and Two Metamorphic Eventsmentioning

confidence: 99%

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EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

et al. 2007

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Two generations of monazite were identified in one mica schist sample from the central zone of the eastern Kunlun Orogen at the northern margin of the Qinghai-Tibet Plateau. The first generation was found in the cores of garnet porphyroblasts with relatively high Y 2 O 3 contents (averaging 1.012±0.088 wt%). The second generation occurs either as inclusions in the rims of garnet porphyroblasts, matrix kyanite, plagioclase and quartz, or as separate crystals associated with matrix biotite and muscovite mostly having a relatively low Y 2 O 3 content (averaging 0.479±0.100 wt%). Electron microprobe (EMP) Th-U-Pb total chemical dating for two grains of the first generation monazite yields average ages of 455 ± 18 Ma and 420 ± 20 Ma, respectively; six grains of the second generation gave an average age of 246.1 ± 3.8 Ma. These ages suggest that the core and rim of the garnet porphyroblasts and their associated assemblages record two events of significant tectonometamorphism. The formation of the Ordovician monazite is related to the tectonometamorphic event responsible for continuous amalgamation of the Gondwanaland in the Late Pan-African period or for consumption of the Proto-Tethys, whereas the development of the Triassic monazite is related to the tectonometamorphic event for consumption of the Paleo-Tethys.

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Section: Two Generation Monazites and Two Metamorphic Eventsmentioning

confidence: 96%

Section: Two Generation Monazites and Two Metamorphic Eventsmentioning

confidence: 99%

EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

et al. 2007

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“…Chemically distinct domains potentially of different ages are commonly observed in BSE images and maps of Y and Th concentrations (e.g., Spear and Pyle, 2002;Gibson et al, 2004). However, it has been shown that chemically distinct domains are not always of different ages (e.g., Williams et al, 1999).…”

Section: Monazite Grain Characteristicsmentioning

confidence: 98%

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

Hoisch

Wells

Grove

2008

Geochimica et Cosmochimica Acta

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“…The findings have important implications in interpreting monazite and zircon ages from the granulites, in general, and the UHT granulites, in particular. In the last two decades, in situ electron microprobe (EMP), (Th þ U)-Pb monazite dating method (Suzuki and Adachi, 1991;Suzuki et al, 1994, Montel et al, 1996 has emerged as an important chronometer to date metamorphic events because of its ability to integrate textural, chemical and age information (Williams et al, 1999;Pyle and Spear, 2003;Kelsey et al, 2003bKelsey et al, , 2007Gibson et al, 2004;Goncalves et al, 2004;Kohn and Malloy, 2004;Foster et al, 2004;Kelly et al, 2006;McFarlane and Frost, 2009). Despite the limitations of the low precision of its ages (see Spear et al, 2009 for an updated review) and the lack of isotopic information to calculate the degree of discordance, if any, recent progress in analytical protocols of monazite analysis (Suzuki and Kato, 2008) makes it possible to generate quality REE, Y, Th, U and Pb data.…”

Section: Introductionmentioning

confidence: 99%

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

et al. 2011

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In this study, we present precise pressure-temperature (P-T) and age constraints of ultrahigh-temperature (UHT) metamorphism of the Bhandara-Balaghat granulite (BBG) domain at the southern margin of the Central Indian Tectonic Zone (CITZ). Supracrustal and metaigneous granulites of this domain, which lie as detached pods and lenses of various sizes within felsic gneiss-migmatite association record protracted high-T crustal anatexis events, broadly synchronous with and/or punctuated with felsic and mafic plutonism. Magnesian metagreywacke protolith of the supracrustal suite records extensive biotite melting and subsequent melt extractions at deep crustal, UHT metamorphic conditions (T ! $9008C at P$8 kbar), producing restitic mineral assemblages of garnet þ rutile, garnet þ cordierite and garnet þ aluminous orthopyroxene. The diversity of the mineral assemblages is related to the domainal-scale variation of the bulk rock composition. In situ chemical age dating of five monazite grains, which occur in the different textural settings of the garnet þ cordierite þ orthopyroxene þ rutile-bearing granulite reveals two age domains: (1) Pervasive $1.6 Ga domain, which is recorded in monazites occurring as inclusions in garnet and in the leucosome matrix is correlated with the timing of the UHT metamorphism. (2) $1.47 Ga domain reflects a fluid-mediated recrystallization event leading to dissolution and re-precipitation of older monazite. The $1.6 Ga monazite chemical ages provide robust constraints on the timing of the earliest stage of tectonothermal processes in the CITZ (defined here as the 'Central Indian Orogeny'). The significance of the $1.6 Ga hot orogenesis in interorogen correlation is discussed.

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Correlations between chemical and age domains in monazite, and metamorphic reactions involving major pelitic phases: an integration of ID-TIMS and SHRIMP geochronology with Y–Th–U X-ray mapping

Cited by 150 publications

References 59 publications

EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

EMP chemical ages of monazites from Central Zone of the eastern Kunlun Orogen: Records of multi-tectonometamorphic events

Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah

∼1.6 Ga ultrahigh‐temperature granulite metamorphism in the Central Indian Tectonic Zone: insights from metamorphic reaction history, geothermobarometry and monazite chemical ages

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