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Partial melting and P-T evolution of eclogite-facies metapelitic migmatites from the Egere terrane (Central Hoggar, South Algeria)

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Published/Copyright: August 4, 2021
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Abstract

The Egéré terrane (Central Hoggar, South Algeria) includes mafic eclogite lenses boudinaged in metapelitic rocks with high-pressure relicts. These metapelites show textural records of partial melting, mainly primary melt inclusions enclosed in garnet crystals and later crystallized as “nanogranitoids.” Garnet porphyroblasts also contain inclusions of quartz, kyanite, phengite, biotite, staurolite, and rutile and show a smoothed prograde zoning with a Mn bell-shaped profile. The peak high-pressure metamorphic assemblage consists of garnet, kyanite, phengite (Si up to 6.36), quartz, rutile, ±ilmenite, ±feldspars, and melt. Phengite has partially transformed into fine-grained aggregates of biotite, plagioclase, and K-feldspar, a microstructure interpreted as resulting from a dehydration melting during exhumation. Phengite breakdown, along with other retrograde reactions, produced a late paragenesis with biotite, plagioclase, K-feldspar, quartz, almandine-rich garnet, ±sillimanite, ±staurolite, ±muscovite, and ilmenite. The thermodynamic modeling of P-T pseudosections allows us to constrain various steps of the metamorphic history: beginning of the garnet growth at 4.0 kbar and ~600 °C during prograde metamorphism; pressure peak at 14–20 kbar; temperature peak at 800–820 °C; formation of the last assemblage at 6.0–5.5 kbar and 725–685 °C. Partial melting likely started during the prograde path when crossing the H2O-saturated solidus, at T ≥ 650–670 °C and P ≥ 10 kbar, continued upon heating, up to the peak conditions, as well as during decompression. This evolution is interpreted in terms of subduction of the continental crust to mantle depths, followed by an exhumation through a clockwise P-T path during the Pan-African orogeny. The Egéré metapelites are relatively well-preserved eclogite-facies rocks, contain inclusions of “nanogranitoids” hitherto very little known in eclogite-facies metamorphic rocks, and represent an unusual trace of subduction within a Neoproterozoic orogen.


† Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html


Acknowledgments

This work is a contribution to the project PHC TASSILLI 15MDU943 and the FP7-IRSES-612572 project “MEDYNA” funded under REA Grant Agreement PIRSES-GA-2013-612572. Grateful thanks are due to the Direction Générale de la Recherche Scientifique et du Développement Technologique of Algeria for funding this work that forms part of the PRFU (E04N01UN160420180001) and PNR ATRST research projects in Algeria. We are extremely grateful to Office du Parc National de l’Ahaggar (Tamanrasset, Algeria) for logistic support during fieldwork, to Chunjing Wei and Abderrahmane Bendaoud for constructive reviews and to Fang-Zhen Teng for the editorial work.

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Received: 2019-10-24
Accepted: 2020-10-03
Published Online: 2021-08-04
Published in Print: 2021-08-26

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. Crustal melting: Deep, hot, and salty
  3. MSA Presidential Address
  4. Petrogenetic and tectonic interpretation of strongly peraluminous granitic rocks and their significance in the archean rock record
  5. Partial melting and P-T evolution of eclogite-facies metapelitic migmatites from the Egere terrane (Central Hoggar, South Algeria)
  6. High-pressure, halogen-bearing melt preserved in ultrahigh-temperature felsic granulites of the Central Maine Terrane, Connecticut (U.S.A.)
  7. Targeting mixtures of jarosite and clay minerals for Mars exploration
  8. Zirconolite from Larvik Plutonic Complex, Norway, its relationship to stefanweissite and nöggerathite, and contribution to the improvement of zirconolite end-member systematics
  9. Nanomineralogy of hydrothermal magnetite from Acropolis, South Australia: Genetic implications for iron-oxide copper gold mineralization
  10. Effect of magnesium on monohydrocalcite formation and unit-cell parameters
  11. Formation pathway of norsethite dominated by solution chemistry under ambient conditions
  12. A model for the kinetics of high-temperature reactions between polydisperse volcanic ash and SO2 gas
  13. Redox control and measurement in low-temperature (<450 °C) hydrothermal experiments
  14. Heat capacity and thermodynamic functions of partially dehydrated sodium and zinc zeolite A (LTA)
  15. P-V-T measurements of Fe3C to 117 GPa and 2100 K: Implications for stability of Fe3C phase at core conditions
  16. New Mineral Names
  17. Erratum
  18. Book Review
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