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Partial Melting of High-P–T Metapelites from the Tshenukutish Terrane (Grenville Province): Petrography and U–Pb Geochronology
Abstract
Kyanite-bearing metapelites from the Tshenukutish terrane (Manicouagan Imbricate zone, Grenville Province) display evidence of anatexis by means of dehydration melting of micas. These rocks were metamorphosed during a Grenvillian high-P–T crustal thickening event with monazite ages ranging from 1040 to 1017 Ma. Samples that best preserve textural differences between former melt and restitic domains provide evidence for dehydration melting of white mica at ∼1400–1600 MPa, followed by extensive to complete dehydration melting of biotite up to temperatures in excess of 850°C, and subsequent crystallization of the melt at lower pressures (∼1100 MPa) during cooling to ∼750°C. Dehydration melting of biotite was accompanied by growth of garnet with distinctive Ca, Y and Cr patterns, locally around subsolidus garnet. In addition, garnet in one sample displays evidence of partial consumption before the latest stage of growth. This is consistent with dehydration melting of phengite instead of muscovite, according to a theoretically defined reaction: Phe + Grt + Qtz = Bt + Ky + Kfs + L. In all samples, melt crystallization was accompanied by growth of retrograde biotite and was completed at temperatures above the stability field of white mica. In samples that achieved textural equilibrium during or after melt crystallization only the composition of garnet provides some hints about the partial melting history.
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In the southern rim of the High-P segment, monazite shows tight age ranges at the sample scale and a younging trend towards the east from 1040 to 1015 Ma (ID-TIMS).
“In the southern rim of the High-P segment monazite shows tight age ranges at the sample scale and a younging trend towards the east from 1040 to 1015 Ma (ID-TIMS; Indares and Dunning 2001).”
From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Indares and Dunning 2001
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Cited by
Sorted by citations
van Gool, J. A. M., Rivers, T., & Calon, T. (2008) · Tectonics · doi:10.1029/2006tc002095 · Cited by 35
The Grenville Province: revisiting the orogenic framework and integrating recent findings
Indares, A. (2025) · Canadian Journal of Earth Sciences · doi:10.1139/cjes-2023-0143 · Cited by 11
Self-citation
Metadata
- Authors
- INDARES, A., & DUNNING, G.
- Venue
- Journal of Petrology
- Publisher
- Oxford University Press (OUP)
- Published
- 2001-08
- Volume
- 42
- Issue
- 8
- Pages
- 1547-1565
- ISSN
- 1460-2415
- 0022-3530
- Cited by
- 54
- References
- 0
- Language
- en
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