Journal ArticleDOI
Relating zircon and monazite domains to garnet growth zones: age and duration of granulite facies metamorphism in the Val Malenco lower crust
Joerg Hermann,Daniela Rubatto +1 more
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TLDR
Using mineral inclusions in zircon and garnet and their rare earth element characteristics, it is possible to relate the ages to distinct stages of granulite facies metamorphism as discussed by the authors.Abstract:
Zircon from a lower crustal metapelitic granulite (Val Malenco, N-Italy) display inherited cores, and three metamorphic overgrowths with ages of 281 ± 2, 269 ± 3 and 258 ± 4 Ma. Using mineral inclusions in zircon and garnet and their rare earth element characteristics it is possible to relate the ages to distinct stages of granulite facies metamorphism. The first zircon overgrowth formed during prograde fluid-absent partial melting of muscovite and biotite apparently caused by the intrusion of a Permian gabbro complex. The second metamorphic zircon grew after formation of peak garnet, during cooling from 850 °C to c. 700 °C. It crystallized from partial melts that were depleted in heavy rare earth elements because of previous, extensive garnet crystallization. A second stage of partial melting is documented in new growth of garnet and produced the third metamorphic zircon. The ages obtained indicate that the granulite facies metamorphism lasted for about 20 Myr and was related to two phases of partial melting producing strongly restitic metapelites.
Monazite records three metamorphic stages at 279 ± 5, 270 ± 5 and 257 ± 4 Ma, indicating that formation ages can be obtained in monazite that underwent even granulite facies conditions. However, monazite displays less clear relationships between growth zones and mineral inclusions than zircon, hampering the correlation of age to metamorphism. To overcome this problem garnet–monazite trace element partitioning was determined for the first time, which can be used in future studies to relate monazite formation to garnet growth.read more
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Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS
TL;DR: In this paper, a protocol was established for simultaneous measurements of zircon U-Pb ages and trace elements by LA-ICP-MS at spot sizes of 16-32?m.
Journal ArticleDOI
Tectonic evolution of a composite collision orogen: An overview on the Qinling–Tongbai–Hong'an–Dabie–Sulu orogenic belt in central China
Yuan-Bao Wu,Yong-Fei Zheng +1 more
TL;DR: In this article, the authors present an overview of regional geology, geochronology and geochemistry for the composite orogenic belt of the Qinling-Tongbai-Hong'an orogens.
Journal ArticleDOI
Experimental zircon/melt and zircon/garnet trace element partitioning and implications for the geochronology of crustal rocks
Daniela Rubatto,Joerg Hermann +1 more
TL;DR: In this paper, the trace element partitioning between zircon and garnet was determined experimentally at 20kbar and 800-1000°C for P,Y,rareearthelements(REE),Zr,Hf,Th andU.
Journal ArticleDOI
Zircon: The Metamorphic Mineral
Daniela Rubatto,Daniela Rubatto +1 more
TL;DR: Metamorphic zircon is no longer an impediment to precise geochronology of protolith rocks, but has become a truly indispensable mineral in reconstructing pressure-temperature-time-fluid-paths over a wide range of settings.
Journal ArticleDOI
Heterogeneous Hadean Hafnium: Evidence of Continental Crust at 4.4 to 4.5 Ga
T. M. Harrison,T. M. Harrison,Janne Blichert-Toft,Wolfgang Müller,Wolfgang Müller,Framcis Albarede,Peter Holden,Stephen J. Mojzsis +7 more
TL;DR: The view that continental crust had formed by 4.4 to 4.5 Ga and was rapidly recycled into the mantle and was supported by initial 176Hf/177Hf values from Jack Hills, Western Australia.
References
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Chemical and isotopic systematics of oceanic basalt : implications for mantle composition and processes
TL;DR: In this article, trace-element data for mid-ocean ridge basalts and ocean island basalts are used to formulate chemical systematics for oceanic basalts, interpreted in terms of partial-melting conditions, variations in residual mineralogy, involvement of subducted sediment, recycling of oceanic lithosphere and processes within the low velocity zone.
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Chemical and isotopic systematics of oceanic basalts. Implications for Mantle Composition and Processes
Journal ArticleDOI
Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types
E. Bruce Watson,T. Mark Harrison +1 more
TL;DR: In this article, the saturation behavior of zircon in crustal anatectic melts as a function of both temperature and composition has been studied and a model of Zr solubility given by: In D Zr Zircon/melt = −3.80−[0.85(M−1)]+12900/T where T is the absolute temperature, and M is the cation ratio (Na + K + 2Ca)/(Al · Si).
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A Compilation of New and Published Major and Trace Element Data for NIST SRM 610 and NIST SRM 612 Glass Reference Materials
Nicholas J. G. Pearce,William T. Perkins,John A. Westgate,Michael P. Gorton,Simon E. Jackson,Clive R. Neal,Simon P. Chenery +6 more
TL;DR: In this article, the authors present a compilation of trace element data from approximately sixty published works for NIST SRM 611 and NISTSRM 613 and provide useful new working values for these reference materials.
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Zircon trace element geochemistry: partitioning with garnet and the link between U–Pb ages and metamorphism
TL;DR: In this article, the trace element distribution coefficients between zircon and garnet were analyzed for trace elements using LA-ICP-MS and SHRIMP ion microprobe.