Tectonostratigraphic relationships and coalification trends in the Narragansett and Norfolk Basins, New England

Murray, Daniel P.; Skehan, James W.; Raben, J.D.

doi:10.1016/j.jog.2004.02.006

Cited by 14 publications

(10 citation statements)

References 41 publications

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“…Chloritoid was formed due to Caledonian Barrovian‐type metamorphism in upper greenschist facies conditions [ Fettes , ]; Ctd03 is taken from Carboniferous metapelites of the Narragansett basin in Natick, Rhode Island, USA. Similar to Ctd01 and Ctd02, it was formed due to Barrovian‐type metamorphism in upper greenschist facies conditions, associated with the Alleghanian orogeny [ Murray et al ., ]; Ctd04 is from Permian metapelites of the Sierra de los Filabres, Andalucia, Spain. Neoformation of the chloritoid crystals was due to greenschist facies Alpine metamorphism [ Vissers , ]; Ctd05 and Ctd06 originate from the village of St. Marcel in the Aosta valley, Italy, and occur in hydrothermally altered metabasalts of the Zermatt‐Saas ophiolite.…”

Section: The Chloritoid Crystalsmentioning

confidence: 99%

Magnetic anisotropy of chloritoid

Haerinck

Debacker²,

Sintubin

2013

JGR Solid Earth

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[1] The magnetocrystalline anisotropy of monoclinic chloritoid, a relatively common mineral in aluminum-rich, metapelitic rocks, has been determined for the first time by measuring the high-field anisotropy of magnetic susceptibility (HF-AMS), using two independent approaches, i.e., (a) directional magnetic hysteresis measurements and (b) torque magnetometry, on a collection of single crystals collected from different tectonometamorphic settings worldwide. Magnetic remanence experiments show that all specimens contain ferromagnetic (s.l.) impurities, being mainly magnetite. The determined HF-AMS ellipsoids have a highly oblate shape with the minimum susceptibility direction subparallel to the crystallographic c-axis of chloritoid. In the basal plane of chloritoid, though the HF-AMS can be considered isotropic. The degree of anisotropy is found to be 1.47, which is significantly higher than the anisotropy of most paramagnetic silicates and even well above the frequently used upper limit (i.e., 1.35) for the paramagnetic contribution to the AMS of siliciclastic rocks. The obtained values for the paramagnetic Curie temperature parallel (θ ∥ ) and perpendicular (θ ⊥ ) to the basal plane indicate that this pronounced magnetocrystalline anisotropy is related to strong antiferromagnetic exchange interactions in the direction of the crystallographic c-axis (θ ⊥ < 0) and rather weak ferromagnetic exchange interactions within the basal plane (θ ∥ > 0). As a consequence, chloritoid-bearing metapelites with a pronounced mineral alignment can have a high degree of anisotropy without the need of invoking a significant contribution of strongly anisotropic, ferromagnetic (s.l.) minerals. The newly discovered magnetocrystalline anisotropy of chloritoid thus calls for a revised approach of magnetic fabric interpretations in chloritoid-bearing rocks.

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Section: The Chloritoid Crystalsmentioning

confidence: 99%

Magnetic anisotropy of chloritoid

Haerinck

Debacker²,

Sintubin

2013

JGR Solid Earth

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“…In southern New England, Carboniferous strata are preserved in the Narragansett and Norfolk, and Worcester basins of Rhode Island and Massachusetts (Hermes et al 1994;Zen et al 1983). Rocks of demonstrable Namurian/Morrowan age in these basins are unknown; the basin fill consists, instead, of younger nonmarine clastic sedimentary rocks of middle to late Pennsylvanian age (Skehan et al 1979;Murray et al 2004).…”

Section: Petrogenesismentioning

confidence: 99%

The Litchfield Pluton in South-Central Maine: Carboniferous Alkalic Magmatism in northern New England, USA

West

Bradley

Coish

2016

atgeol

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The Litchfield pluton is a poorly exposed 7 km 2 composite alkalic intrusive complex that cuts previously deformed and metamorphosed Silurian turbidites in south-central Maine. The pluton includes a variety of alkaline syenites, including the type locality of "litchfieldite, " a coarse-grained cancrinite-, sodalite-, and lepidomelane-bearing nepheline syenite first recognized over 150 years ago and common in many petrologic collections. A new U-Pb zircon age of 321 ± 2 Ma from the nepheline syenite is interpreted to represent the crystallization age of the plutonic complex. A new biotite 40 Ar/ 39 Ar age of 239 ± 1 Ma from the syenite is similar to previously published mica ages from the surrounding country rocks and dates the time of regional cooling in the area below ~ 300°C. Whole-rock chemical analyses of rocks of the Litchfield pluton reveal silica-undersaturated alkaline compositions that are consistent with formation in a within-plate tectonic setting. The age and geochemical characteristics of the alkalic igneous rocks near Litchfield are consistent with a model that invokes the generation of a small volume of alkalic magma beneath south-central Maine during a period of Carboniferous transcurrent tectonism in the northern Appalachian orogen. RÉSUMÉLe pluton de Litchfield est un complexe intrusif alcalin composite de sept kilomètres carrés peu affleurant qui recoupe des turbidites siluriennes précédemment déformées et métamorphisées dans le centre-sud du Maine. Le pluton inclut diverses syénites alcalines, notamment la localité type de la « litchfieldite », une syénite néphélinique renfermant de la cancrinite, de la sodalite et de la lépidomélane à grain grossier identifiée pour la première fois il y a plus de 150 ans et répandue dans maintes collections pétrologiques. Une nouvelle datation U-Pb sur zircon de 321 ± 2 Ma de la syénite néphélinique est interprétée comme une représentation de l'âge de la cristallisation du complexe de roches plutoniques. Une nouvelle datation de la syénite par biotite et The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA nepheline syenite (Fig. 2) that was assigned the name "litchfieldite" by Bayley (1892), is part of a composite alkalic plutonic complex (Barker 1965) that occupies an area of approximately 7 km 2 (Fig. 3). While these unusual rocks have attracted the interest of mineral collectors for over a century and a half, extremely poor exposure has discouraged detailed study; thus the age and tectonic INTRODUCTIONSince the mid-1800s (Jackson 1845; Clarke 1886), the small village of Litchfield in south-central Maine (Fig. 1) has been known as a collecting locality for specimens of cancrinite, sodalite, nepheline, and lepidomelane (Fe-rich biotite). The host rock to these minerals, a coarse-grained of the Litchfield pluton, Barker (1965) suggested that they are associated with the Mesozoic White Mountain magma series. However, limited major element geochemical data are available from these rocks, and ...

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“…Alleghanian deformation can be seen throughout the Narragansett Basin, but the intensity of deformation and metamorphic grade increase from northeast to southwest (Skehan et al 1979;Mosher 1983;Murray et al 2004). As a result, the Narragansett Basin is divided into two domains (Mosher 1983;Murray et al 2004). The more intensely deformed southern domain ranges from chlorite-to sillimanite-and kyanite-grade rocks and records at least four phases of late Paleozoic deformation.…”

Section: Geological Settingmentioning

confidence: 99%

“…The mildly deformed northern domain records only the first phase of deformation. Because of its complicated deformational history and abundant coastal exposures, extensive work has been conducted in the southern domain of the basin (Mosher 1983;Mosher and Rast 1984;Murray et al 2004;Rich 2006). Deformation is less well studied in the generally poorly exposed northern domain (Shaler et al 1899;Lyons 1977).…”

Section: Geological Settingmentioning

confidence: 99%

“…Thrust faults and normal faults are recognized and border faults may be present, although evidence for such structures is poor (Lyons 1977;Skehan et al 1979). Based on mineral assemblages and coal rank, the northern domain of the basin experienced low-grade metamorphism and consists of subgreenschist-facies rocks (Skehan et al 1979;Murray et al 2004;Connell 2006;Kirkwood 2006).…”

Section: Geological Settingmentioning

confidence: 99%

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