Multi-stage garnet in the internal Brianconnais basement (Ambin massif, Savoy): New petrological constraints on the blueschist-facies metamorphism in the Western Alps and tectonic implications

Three types of garnet have been distinguished in pelitic schists from an epidote-blueschist-facies unit of the Ambin and South Vanoise Brianconnais massifs on the basis of texture, chemical zoning and mineral inclusion characterization. Type-1 garnet cores with high Mn/Ca ratios are interpreted as pre-Alpine relicts, whereas Type-1 garnet rims, Type-2 inclusion-rich porphyroblasts and smaller Type-3 garnets are Alpine. The latter are all characterized by low Mn/Ca ratios and a coexisting mineral assemblage of blue amphibole, high-Si phengite, epidote and quartz. Prograde growth conditions during Alpine D-1 high-pressure (HP) metamorphism are recorded by a decrease in Mn and increase in Fe (+/-Ca) in the Type-2 garnets, culminating in peak P-T conditions of 14-16 kbar and 500degreesC in the deepest parts of the Ambin dome. The multistage growth history of Type-1 garnets indicates a polymetamorphic history for the Ambin and South Vanoise massifs; unfortunately, no age constraints are available. The new metamorphic constraints on the Alpine event in the massifs define a metamorphic T `gap' between them and their surrounding cover (Brianconnais and upper Schistes Lustres units), which experienced metamorphism only in the stability field of carpholite-lawsonite (T < 400degreesC). These data and supporting structural studies confirm that the Ambin and South Vanoise massifs are slices of `eclogitized' continental crust tectonically extruded within the Schistes Lustres units and Brianconnais covers. The corresponding tectonic contacts with top-to-east movement are responsible for the juxtaposition of lower-grade metamorphic units on the Ambin and South Vanoise massifs.

A rose of Savoy; Marie Adélaïde of Savoy, duchesse de Bourgogne, mother of Louis XV.

Mode of access: Internet.

An account of Shelley's visits to France, Switzerland, and Savoy, in the years 1814 and 1816, with extracts from "The history of a six weeks' tour" and "Letters descriptive of a sail round the Lake of Geneva and of the glaciers of Chamouni," first published in the year 1817.

Bibliography: p. [105]-108.

Switzerland and the adjacent portions of Italy, Savoy, and Tyrol; handbook for travellers,

Mode of access: Internet.

The high and puissant Princess Marguerite of Austria, Princess Dowager of Spain, Duchess Dowager of Savoy, Regent of the Netherlands /

Maps on lining-papers.

Letters, during a tour through some parts of France, Savoy, Switzerland, Germany, and the Netherlands : in the summer of 1817 /

Shaw and Shoemaker 45466.

The history of Francis-Eugene, prince of Savoy [... containing the military transactions of above thirty campaigns made by his Serene Highness in Hungary, Italy, Germany, and the Low-Countries, and interspersed with other memorable events, during a course of more than fifty years].

Mode of access: Internet.

Travels through the Alps of Savoy and other parts of the Pennine chain : with observations on the phenomena of glaciers /

Includes index.

The Life and military actions of His Royal Highness Prince Eugene, of Savoy.

Head and tail-pieces, initials.

Coryat's crudities; hastily gobled up in five moneths travells in France, Savoy, Italy, Rhetia commonly called the Grisons country, Helvetia alias Switzerland, some parts of high Germany and the Netherlands; newly digested in the hungry aire of Odcombe in the county of Somerset, and now dispersed to the nourishment of the travelling members of this kingdome,

Special t.p.: Posthuma fragmenta poematum Georgii Coryati Sarisburiensis, sacrae theologiae baccalaurei, quondem e sociis Novi collegii in inclyta academia Oxoniensi, ac postea ecclesiae Odcombiensis in agro Somersetensi ministri, ubi tandem anno 1606, extremum viatae diem clausit. Londini, anno domini 1611: vol. II, p. [377-408].

Switzerland and the adjacent portions of Italy, Savoy, and Tyrol; handbook for travellers,

Mode of access: Internet.