Geochemical evidence for a Ganderian arc/back-arc remnant in the Nashoba Terrane, SE New England, USA

Kay, Andrew; Hepburn, J. Christopher; Kuiper, Yvette D.; Baxter, Ethan F.

doi:10.2475/04.2017.01

Cited by 20 publications

(43 citation statements)

References 69 publications

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“…The SFA of VT, MA and CT is an arc on Gondwanan terrane (Karabinos and Williamson, 1994;Macdonald et al, 2014). The Cambrian to Ordovician arc and backarc related rocks in the SE part of the study area (Miramichi Highlands, Casco Bay, Penobscot arc including Nashoba, New River and Annidale Terranes) have Ganderian provenance (c.f., Kay et al, 2017;Hussey et al, 2010, van Staal et al, 2016Fyffe et al, 2011). Tetagouche Gp.…”

Section: ) Ganderian Vs Laurentian Provenance Of Basement and Igneomentioning

confidence: 99%

“…Penobscot (ME and NB), Nashoba (MA), Popelogan (ME), Shelburne Falls (VT, MA and CT), and Notre Dame (QE) arcs are widely interpreted to overlie east-dipping subduction (van Staal et al, 1996;van Staal and Barr, 2012;Kay et al, 2017;Karabinos et al, 1998;Moench and Aleinikoff, 2003;DeSouza et al, 2012;Perrot et al, 2017) spanning Cambrian through Ordovician time. The Oliverian Domes and Quimby Volcanics of the BHA (ME, NH, MA and CT) represent arc rocks above west-dipping subduction, intruding through Laurentian crust (Karabinos et al, 1998;Moench and Aleinikoff (2003).…”

Section: ) Polarity Of Subductionmentioning

confidence: 99%

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Can Back-Arc Processes in a Simplified Model Explain Much of the Complexity of the Northern Appalachian Orogen?

Bloch¹,

Provided²,

Reusch³

2019

Geological Society of America Abstracts With Programs

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Section: ) Ganderian Vs Laurentian Provenance Of Basement and Igneomentioning

confidence: 99%

Section: ) Polarity Of Subductionmentioning

confidence: 99%

Can Back-Arc Processes in a Simplified Model Explain Much of the Complexity of the Northern Appalachian Orogen?

Bloch¹,

Provided²,

Reusch³

2019

Geological Society of America Abstracts With Programs

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“…The Nashoba terrane in eastern Massachusetts (Figure 1.1) is a strongly deformed Cambrian-Ordovician peri-Gondwanan arc-backarc complex that is composed of metavolcanic, metasedimentary, and volcanogenic metasedimentary rocks intruded by Silurian and younger granitic plutons (Zen et al, 1983;Goldsmith, 1991a;Hepburn et al, 1995;Kay et al, 2017). The Nashoba terrane is separated from the Avalon terrane to the southeast by the Burlington mylonite zone (Hepburn et al, 1995;Stroud et al, 2009) and overprinting brittle Bloody Bluff fault (Zen et al, 1983;Goldsmith, 1991b).…”

Section: The Nashoba Terranementioning

confidence: 99%

Characterizing the Southwestern Extent of the Norumbega Fault System, a Mid-Paleozoic Crustal-Scale Strike-Slip Fault System in the New England Appalachians

Gentry¹

2018

Geological Society of America Abstracts With Programs

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The >300 km long, northeast-trending dextral transpressive Norumbega fault system in Maine and New Brunswick is defined by a tens of kilometers wide zone of multiple dextral shear zones. Based on published 40 Ar/ 39 Ar hornblende data and U-Pb zircon and monazite ages, dextral shear along the fault system initiated by ~380 Ma. The location and nature of the southwestern termination of the Norumbega fault system was investigated in this study. Previously, no fault system in New Hampshire or eastern Massachusetts has been recognized with an orientation, timing, and motion sense consistent with those of the NFS. Detailed structural mapping was carried out along topographic lineaments and mapped shear zones in New Hampshire and Massachusetts to test whether the NFS extends into those areas. The Rye Complex in southeastern coastal NH was the only location investigated that presented field characteristics consistent with the NFS. The Nannie Island shear zone in southeastern NH is along strike with the NFS, but contains both sinistral and dextral shear sense indicators and has a lower metamorphic grade. The dextral ENEtrending Shirley mylonite zone in central-eastern MA is similar to the NFS, but the ENE trend is not consistent with that of the NFS, and no connecting shear zone between the Shirley mylonite zone and NFS has been found. U-Pb monazite laser ablation inductively coupled mass spectrometry (LA-ICPMS) dates dextral deformation along the NFS and its potential extensions to the southwest. The four sample locations dated were the NFS in ME, the Rye Complex, the Nannie Island shear zone, and the Shirley mylonite zone. The NFS contained monazite ages of ~390-370 Ma related to dextral deformation. The Rye Complex yielded ages of ~430 to ~370-360 Ma, ~380 Ma and ~370 Ma, consistent with NFS deformation and earlier Acadian metamorphism that started at ~430 Ma. The Nannie Island shear zone produced monazite populations of ~441, ~700, ~900-800, and ~1775iv Ma, which are all older than the late Silurian or earliest Devonian age of the rock and, therefore, interpreted as detrital. The Shirley mylonite zone in MA yielded an age of ~380 Ma which is consistent with the age of deformation along the NFS.Thus, the Rye Complex is the only location investigated in this study that matches the NFS in shear zone orientation, deformation style, shear sense, and age of deformation, and therefore could be the southernmost extension of the NFS. The NFS has been demonstrated not to extend farther to the southwest.

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“…In New England, the Putnam-Nashoba terrane and its lowermost part, the Quinebaug-Marlboro belt, occupies the easternmost part of Ganderia, where it structurally overlies Avalonia. The presence of arc-related mafic rock geochemistry, positive εNd(500) values, 1.6-1.8 Ga model ages, and a single Cambrian U-Pb zircon age led to the interpretation that the Putnam-Nashoba terrane coincides with the trailing edge of Ganderia (Hibbard et al, 2006; van Staal et al, 2009van Staal et al, , 2012Pollock et al, 2012;Kuiper, 2016;Kay et al, 2017) (Fig. 1).…”

Section: ■ Introductionmentioning

confidence: 99%

“…These challenges create obstacles to establishing long-distance correlations. The paucity of reliable ages and the uncertain origins of the belt have hampered regional correlations within the Appalachians (Hibbard et al, 2006(Hibbard et al, , 2007a(Hibbard et al, , 2007bMerschat and Hatcher, 2007; van Staal et al, 2009van Staal et al, , 2012Merschat et al, 2010;Kay et al, 2017), and Ganderia is considered one of the most complex peri-Gondwanan terranes (van Staal et al, 2012).…”

Section: ■ Introductionmentioning

confidence: 99%

Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA

et al. 2021

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Crustal fragments underlain by high-grade rocks represent a challenge to plate reconstructions, and integrated mapping, geochronology, and geochemistry enable the unravelling of the temporal and spatial history of exotic crustal blocks. The Quinebaug-Marlboro belt (QMB) is an enigmatic fragment on the trailing edge of the peri-Gondwanan Ganderian margin of southeastern New England. SHRIMP U-Pb geochronology and geochemistry indicate the presence of Ediacaran to Cambrian metamorphosed volcanic and intrusive rocks dated for the first time between ca. 540–500 Ma. The entire belt may preserve a cryptic, internal stratigraphy that is truncated by subsequent faulting. Detrital zircons from metapelite in the overlying Nashoba and Tatnic Hill Formations indicate deposition between ca. 485–435 Ma, with provenance from the underlying QMB or Ganderian crust. The Preston Gabbro (418 ± 3 Ma) provides a minimum age for the QMB. Mafic rocks are tholeiitic with trace elements that resemble arc and E-MORB sources, and samples with negative Nb-Ta anomalies are similar to arc-like rocks, but others show no negative Nb-Ta anomaly and are similar to rocks from E-MORB to OIB or backarc settings. Geochemistry points to a mixture of sources that include both mantle and continental crust. Metamorphic zircon, monazite, and titanite ages range from 400 to 305 Ma and intrusion of granitoids and migmatization occurred between 410 and 325 Ma. Age and chemistry support correlations with the Ellsworth terrane in Maine and the Penobscot arc and backarc system in Maritime Canada. The arc-rifting zone where the Mariana arc and the Mariana backarc basin converge is a possible modern analog.

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Geochemical evidence for a Ganderian arc/back-arc remnant in the Nashoba Terrane, SE New England, USA

Cited by 20 publications

References 69 publications

Can Back-Arc Processes in a Simplified Model Explain Much of the Complexity of the Northern Appalachian Orogen?

Can Back-Arc Processes in a Simplified Model Explain Much of the Complexity of the Northern Appalachian Orogen?

Characterizing the Southwestern Extent of the Norumbega Fault System, a Mid-Paleozoic Crustal-Scale Strike-Slip Fault System in the New England Appalachians

Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA

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