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Compositions of chlorite, epidote, and 6 , the analyses trace three compositional profiles, prehnite are presented in Table 2.

No trend in the mon, more calcic composition. Internal zonation, present Electron Probe Microanalyses in some epidote grains, does not show any consis- Microprobe analyses were performed on an tent pattern.

Model AMX microanalyser equipped with an energy dispersive system set up and supervised Discussion by P.

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Partial electron probe microanalyses of representative minerals in each zone of samples S-1, S-2, and P-l see Fig. Electron probe analyses indicate consistently that the 'mineral' is an intergrowth of -urehnite and actinolite. The origin of the nodules in the Eastport Forma- tion is probably significantly different from that of the epidote-rich patches in either of the above envi- ronments.

Features such as the enrichment in cal- cium and iron, the depletion in potassium, and the growth of new chlorite along margins of nodules in shales are characteristic of diagenetic calcareous concretions Knoke ;Girin Sketch of zoned epidofe-rich nodules.

A Nodule in represent their metamorphosed equivalents. Zone I : unaffected host rock. Zone 2: recrys- tallized zone. Zone 3: chlorite rim. Zone 4: epidote-rich zone. The most obvious problem concerning the Zone 5: poikiloblastic prehnite zone. Crosscutting lines repre- metamorphism of the nodules is the striking tex- sent prehnite-epidote veinlets.

B Nodule in sandstone; sample tural and mineralogical contrast between the rela- S Zone 1: unaffected sandstone with relict clastic texture. Apparently the bulk composition of the nodule favoured mineralogical reorganization to 1 m epidote-, pumpellyite-, and prehnite-rich at very low grade conditions whereas the chloritic alteration patches in prehnite-pumpellyite facies and pelitic matrix remained unchanged at the same mafic lavas and associated clastic rocks in the Cen- temperature.

He Reactions producing Ca-A1 silicates from clay attributed their origin to migration of calcium from mineral-carbonate assemblages are possible only plagioclase during spilitization, which occurred under very low Xcoz conditions Coombs A synchronously with burial metamorphism.

Harri- fluid rich in H,O, probably derived from surround- gan and MacLean noted large m diame- ing water-rich sedimentary rocks, is thought to ter patches rich in epidote, in gabbro dykes of the have permeated the nodules during metamorphism. Matagami region of Quebec, considered to have Girin found kaolinite, quartz, hydromica, NOTES chlorite, and oligoclase as non-carbonate residue in a study of the geochemistry of calcareous concre- tions. Nokleberg sug- gested a mechanism by which CO, in the presence of H,O may act as a source of oxygen during meta- morphism.

Average epidote composition of nodules Reaction 2 would account for the absence of opaques in the nodule core. Martin concluded that the St. George plu- FIG. Histograms showing variation in bulk chemistry ton is a high level intrusion, based on the presence through half of three epidote-bearing nodules zone 1 represents of volcanic equivalents as inclusions in the pluton.

Complete analyses are available from the authors upon request. The contact metamorphic assemblage quartz, K-feldspar, biotite, plagioclase, cordierite, and an- dalusite reported by Pajari supports this view, indicating a maximum lithostatic pressure of 2.

The spatial association of nodule-bearing rocks with the St. George pluton and very low-grade burial metamorphic effects in mafic volcanic rocks implies that the pluton provided the heat for metamorphism. Conclusions Zoned epidote nodules in shallow-water sedi- mentary rocks of the Eastport Formation have formed through two separate processes: calcareous concretions developed as chemical heterogeneities in the rocks during diagenesis; subsequent thermal metamorphism by the St.

The textural within samples S-2 dot-dashed line , S-1 solid line , and P-1 dotted line. Points 4 and 5 are part of the dotted line. Geochemis- reorganization under very low-grade conditions, try International, 4, pp. Petrography and geochemistry of epidote alteration patches in gabbro dykes at to produce hydrous Ca-A1 silicates epidote, Matagami, Quebec. Canadian Journal of Earth Sciences, 13, prehnite, and actinolite.

Untersuchungen zur Diagenese an Kalkton- kretionen und umgebenden Tonschiefern.

Contributions to Acknowledgements Can. Helmstaedt are Brunswick, Canada. American Journal of Science, , pp. We wish to thank P. Roeder for supervising the microprobe work. C 0 2 as a source of oxygen in the manuscript has benefitted substantially from criti- metamorphism of carbonates. Criticisms by G. The granitic rocks of southwestern New Pajari and an unnamed referee are greatly ap- Brunswick. Fieldguide to Excursions. Edited by N.

Canadian Journal of land. Part 13, pp.

Copenhagen, Denmark. Andrews, New Brunswick. Redistribution of major elements in the University, Kingston, Ont. Geochemical stages during diagenesis of Journal of Petrology, 9, pp.

Early descriptions, old photographs, tree-rings, an annual sequence of photos since , and field observations provide a data base. The Wenkchemna Glacier combines characteristics of ice-cored rock glaciers, ablation complexes, and glaciers, supporting the concept of a transition between these features.

It is the product of a unique geomorphic-climatic system where a large mountain wall of northerly exposure produces a glacial micro-climate, a freeze-thaw weathering environment, a high rockfall frequency, and copious avalanche activity that led, in turn, to a thin, active mass of glacier ice that is preserved by a cover of rock debris. The behavior of the Wenkchemna Glacier has lagged behind that of surrounding glaciers by at least 70 years.

Geosciences: a tool in a changing world, Pisa Impacts of fluids on the mineralogical record in subduction zones; implications for Pressure-Temperature-time-Deformation reconstructions. Subduction of continental basement: scales of brittle deformation, re -hydration and density filtering. Goldschmidt Jadeite and nepheline in the Gran Paradiso Massif, W.

Alps: stability vs. Chronology, patterns and rates of erosion and deposition processes, western Peruvian Andes. The fate of continental fragments during subduction at high pressures: insight from the Sesia Zone Western Italian Alps.

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An inverse modeling strategy and a computer program to model garnet growth and resorption. Microstructural record vs chemical and geochronological preservation in muscovite: implications for P-T-t estimates in deformed metapelites.

The Long-term deformation of the Longmen Shan Sichuan, China , a key to understand the present structure of the eastern Tibet. Microstructural record vs chemical and geochronological preservation in muscovite: implications for P-T-t-d estimates in deformed metapelites Best Student Poster Presentation Award.

Pyrenean oscillatory-zoned chlorite: From field to geochemical solid-solution model. Charpentier, D. Deformation conditions registrated by phylosilicates in a thrust fault Pic de Port Vieux Fault, Pyrenees. Alps: Deciphering the high-pressure evolution of continental crust. Thermochronology of fault activity by characterisation of clay minerals example of Pic de Port Vieux thrust, Pyrenees, Spain.

Fluid-rock interactions and deformation conditions recorded by phyllosilicates in a major thrust Gavarnie thrust at Pic de Port Vieux, Pyrenees. EMC [81] Litty, C. Provenance and sediment dynamics within river basins in western Peru through detrital zircon U-Pb ages. Thermochronology of fault activity by characterizations of clay minerals Example of Pic de Port Vieux thrust, Pyrenees, Spain.

GFA [79] Lanari, P. Thermodynamic modeling using Bingo-Antidote: A new strategy to investigate metamorphic rocks. EGU [78] Litty, C. Provenance and sediment dynamics within river basins in Western Peru through detrital zircons U-Pb ages.

EGU [77] Laurent, V. Tectonometamorphic record and strain localization in a fossilized subduction channel: insights from the Cycladic Blueschist Unit Cyclades, Greece. EGU [76] Burn, M. What is a single growth zone for a geochronologist? Insights from allanite U-Th-Pb dating. EGU [75] Lanari, P.

A micro-mapping strategy to investigate mechanical and chemical mass transport in migmatite. EGU [74] Link, G. Metasomatism-controlled nucleation and development of paired-shear zone: an example from the Neves area Eastern Alps, Italy.

EGU [73] Lanari, P. Production of melt in migmatite investigated by micro-mapping the local effective bulk LEB composition in domains. Tectonometamorphic record and strain localization in a fossilized subduction channel: insights from the Cycladic Blueschist Unit Syros, Greece. Topo-Europe Swiss Geoscience Meeting Petrochronological investigations of the geodynamic processes leading to the exhumation of the Liguro-Piedmontais oceanic prism during Alpine collision.

The art to reconstruct the evolution of HP-terrains using a petrochronological approach. Metamorphic and structural evolution in the internal Western Alps.

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Synthesis of ages obtained by direct dating of Alpine External Crystalline Massifs shear zones — Insights for an Oligocene-to-Present underthrusting-exhumation cycle. What do phyllosilicates tell us about their conditions of formation?

Euroclays Oscillatory chemical zoned chlorite from a hydrothermal vein, Pic-de-Port-Vieux thrust, Pyrenees, Spain. How precisely evidences of P-T stages are preserved in HP rocks? Insights from micro-mapping of local effective bulk.

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Micro-mapping of chemical potential gradients; new arguments to bury the concept of global equilibrium in metamorphic rocks. RST Crustal-scale structure of South Tianshan: Implications for subduction polarity and Cenozoic reactivation. Modeling the equilibration volume in eclogite by micro-mapping approach, evidence for dehydration at high-pressure Kyrgyz Tianshan, Central Asia. Chlorite crystallization induced by fluid circulation and deformation along a thrust fault Pic de Port Vieux thrust, Pyrenees.Differences in degree of recrystallization between the nodules and their host rocks are attributed to differences in original bulk composi- tion.

Please send us your proof of payment to comptabilite lfib. We will then inform parents of the results. Zone 4: epidote-rich zone. The St.

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