metamorphic petrology; geochronology; high pressure; continental subduction; Western Alps; Rare Earth minerals; Sesia Zone; Dent Blanche nappe; PTt-paths; thermal evolution; polycyclic orogen; in situ geochronology
Manzotti Paola, Zucali Michele (2013), The pre-Alpine tectonic history of the Austroalpine continental basement in the Valpelline unit (Western Italian Alps), in Geological Magazine
, 150(1), 153-172.
Manzotti P, Rubatto D, Darling J, Zucali M, Cenki-Tok B, Engi M (2012), From Permo-Triassic lithospheric thinning to Jurassic rifting at the Adriatic margin: Petrological and geochronological record in Valtournenche (Western Italian Alps), in LITHOS
, 146, 276-292.
Berger A., Thomsen T.B., Ovtcharova M., Kapferer N., Mercolli I. (2012), Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton, in Swiss Journal of Geoscience
, 105, 49-65.
Regis D., Cenki-Tok B., Darling J., Engi M. (2012), Redistribution of REE, Y, Th and U at high pressure: Allanite-forming reactions in impure meta-quartzites (Sesia Zone, Western Italian Alps), in Amer. Mineral.
, 97, 315-328.
Darling J., Storey C., Engi M. (2012), Allanite U-Th-Pb geochronology by laser ablation ICP-MS, in Chemical Geology
, 292-293, 103-115.
Manzotti Paola (2011), Petro-structural map of the Dent Blanche tectonic system between Valpelline and Valtournenche valleys, Western Italian Alps, in JOURNAL OF MAPS
Gregory C., Rubatto D., Hermann J., Berger A., Engi M. (2011), Allanite behaviour during incipient melting in the southern Central Alps, in Geochim. Cosmochim. Acta
, 84, 433-458.
Cenki-Tok B, Oliot E, Rubatto D, Berger A, Engi M, Janots E, Thomsen TB, Manzotti P, Regis D, Spandler C, Robyr M, Goncalves P (2011), Preservation of Permian allanite within an Alpine eclogite facies shear zone at Mt Mucrone, Italy: Mechanical and chemical behavior of allanite during mylonitization, in LITHOS
, 125(1-2), 40-50.
Zucali M, Manzotti P, Diella V, Presenti C, Rispendente A, Darling J, Engi M (2011), Permian tectonometamorphic evolution of the Dent-Blanche Unit (Austroalpine domain,Western Italian Alps), in Rendiconti online Soc. Geol. It
, 15, 133-136.
Rubatto D, Regis D, Hermann J, Boston K, Engi M, Beltrando M, McAlpine SRB (2011), Yo-yo subduction recorded by accessory minerals in the Italian Western Alps, in NATURE GEOSCIENCE
, 4(5), 338-342.
Janots E, Berger A, Engi M (2011), Physico-chemical control on the REE minerals in chloritoid-grade metasediments from a single outcrop (Central Alps, Switzerland), in LITHOS
, 121(1-4), 1-11.
A field-based project aims to reconstruct the tectonometamorphic evolution of the internal Western Alps, a classic high-pressure terrain. Characterized by predominantly continental rocks, most of the polycyclic, the current picture of this important orogenic segment is wrought with discrepant age data and a paucity of data relating to the initial convergence at the Apulian margin. This project concentrates on monometamorphic units uints first, to work out the Alpine history by integrating structural, petrological, and geochronological methods. In the second part, polymetamorphic units are investigated as well, and the processes and scale of crustal recycling as well as the assembly of the orogen are worked out.Much emphasis is laid on extending the possibilities of in situ isotopic age dating of robust mineral chrono¬meters, notably allanite and monazite, using Th-Pb and U-Pb analysis. An improved procedure for LA-ICP-MS analysis is developped and applied in conjunction with ion probe (SHRIMP) dating. Work on isotopic standard materials is proposed, again primarily for allanite. The reaction mechanisms of allanite and its potential for integrated petrochronometry are investigated. Field work in the Dent Blanche nappe, the central and southern Sesia Zone, and in several Austroalpine klippen units includes detailed mapping, structurally controlled sampling, and correlation. Petrological and geochronological analysis of samples aims to quantify the spatial and temporal evolution of tectonic units. Quantitative PTDt-paths are derived, yielding constraints on the rates of tectonometamorphic processes (heating, subduction, mineral reaction, and exhumation). A number of currently hot problems of metamorphic petrology and geochemistry are addressed as part of this comprehensive study. These include the extent of re-equilibration of polymetamorphic rocks (including eclogite facies superimposed on granulite facies), the mobility of trace element, and the REE-budget in various metamorphic environments under high pressure conditions.