Polymetamorphism of marbles in the Morin terrane, Grenville Province, Quebec

Abstract

The Morin terrane (Grenville Province, Quebec) is dominated by the 1.15 Ga Morin Anorthosite Massif and related granitic intrusions, all of which exhibit granulite-facies mineral assemblages. Anorthosite-suite rocks are deformed both in shear zones and in the interior of the terrane and show intrusive contact relations with marble along road cuts near the village of St. Jovite. Intrusive rocks exposed in these road cuts have well-developed skarns, which were deformed with the intrusions after emplacement. Skarn minerals are consumed by garnet-forming reactions (e.g., An + Wo = Gr + Qtz) that preserve granulite-facies temperatures and pressures. Calcite–graphite thermometry of Morin terrane marbles records temperatures of 755 ± 38 °C (n = 21), independent of proximity to anorthosite-suite plutons. Preserved metamorphic conditions and the retrograde pressure–temperature (P–T) path in the Morin terrane are very similar to conditions during the 1.07 Ga Ottawan orogeny in the Adirondack Highlands. Metamorphism and deformation of anorthosite-suite rocks and marbles of the Morin terrane are consistent with anorthosite intrusion followed by a distinct granulite-facies overprint.

Constraining soil mineral weathering 87Sr/86Sr for calcium apportionment studies of a deciduous forest growing on soils developed from granitoid igneous rocks

“…The study site is situated approximately five kilometers west of a contact zone with anorthosite-orthopyroxene granitoids and southeast of a series of banded granitic gneisses, charnockite gneiss, orthopyroxene granitoids (charnockite, mangerite, jotunite and syenite) and sparse areas of marble (Figure 1). Glacial advance from the north (Veillette, 2004) resulted in a mixing of minerals and rock fragments sampled from the surrounding felsic rocks containing minerals such as quartz, muscovite, plagioclase, Kfeldspar, hornblende and biotite, and marbles containing calcite (Peck et al, 2005 (Barton and Doig, 1977). This age is similar to the U-Pb zircon age of the Morin Anorthosite dated at 1155 ± 3 Ma (Doig, 1991 Rb decay.…”

“…The calcite in the soils may be derived from several bedrock sources outcropping in the region, including Phanerozoic marine carbonates, Proterozoic marbles and original igneous calcite from calc-silicate skarn assemblages in rocks of the Morin series (Peck et al, 2005) gathered and mixed into the till by Pleistocene ice sheets moving towards the South (Figure 1). At HEW, F. Courchesne (personal communication) has also measured high Ca concentrations (mean of 5.61 mg l -1 with a maximum value of 9.30 mg l -1 ) in shallow wells (80 cm from surface) collecting groundwater from clay-rich pond sediments.…”

Extending and Enhancing the Properties of Porous Cordierite Ceramics by Mo6+ ion Incorporation via Facile Combined Synthesis Technique

“…The reason of disappearing a-cordierite phase and evolution of the above-mentioned phases is attributed to the change in the bulk stoichiometric composition that may modified by severe infiltration-metasomatism, interaction with melt, or partial melting due to the incorporation of MoO 3 . [36][37][38][39] By insertion of 10% MoO 3 , the a-cordierite phase is identified as the predominant phase and associated with the formation of sapphirine, enstatite, and Mo 4 O 19 (ICDD: 81-1264) as impurity phases. Moreover, the addition of 15% MoO 3 leads to the detection of a-cordierite phase as the main phase accompanied with MoO 3 (ICDD: 80-0347) and Mo 4 O 19 phases as impurity phases.…”

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“…The deformation and metamorphism have been ascribed to the 1.19-1.14 Ga Shawinigan orogeny based on geochronology in the Central Metasedimentary Belt of Québec and Adirondack Highlands (Corriveau and van Breeman, 2000;Martignole et al, 2000;Peck et al, 2005), although until now, no metamorphic minerals with high closure temperatures had been dated in the Morin terrane. The Shawinigan orogeny is interpreted to have resulted from western-directed docking of the Allochthonous monocyclic belt (including the Dysart-Mt.…”

“…2). Because of its geology, most studies in the Morin terrane have focused on anorthosite-suite magmatism, regional metamorphism, and tectonic history (e.g., Martignole and Schrijver, 1970;Indares and Martignole, 1990;Martignole et al, 2000;Peck and Valley, 2000;Peck et al, 2005). A relatively unstudied feature, especially in recent decades, is the nature of the country rocks to the AMCG suite.…”