Suturing and extensional reactivation in the Grenville orogen, Canada

Busch, Jay P.; Mezger, Klaus; Pluijm, Ben A. van der

doi:10.1130/0091-7613(1997)025<0507:saerit>2.3.co;2

Cited by 31 publications

(30 citation statements)

References 21 publications

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“…The timing and nature of this shearing also correlates with transpressional convergence of the Sharbot Lake and Mazinaw domains farther to the west in the MB (Mezger et al 1993;Busch et al 1997; fig. 1).…”

Section: Discussionmentioning

confidence: 73%

Early History of the Carthage‐Colton Shear Zone, Grenville Province, Northwest Adirondacks, New York (U.S.A.)

Streepey

Johnson

Mezger

et al. 2001

The Journal of Geology

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A B S T R A C TThe Adirondack Mountains expose two distinct tectonic elements of the Proterozoic Grenville Province of northeastern North America: the Adirondack Lowlands and Highlands. The Lowlands are located along the eastern edge of the Metasedimentary Belt, and the Highlands form the western portion of the Granulite Terrane. The two are separated by the Carthage-Colton Shear Zone (CCSZ). U/Pb titanite and 40 Ar hornblende ages in the Lowlands are ca. 100 m.yr. older than in the Highlands, across the CCSZ. While both the Lowlands and the Highlands record a history of metamorphism during the Elzevirian Orogeny (ca. 1150 Ma), only the Highlands record evidence of a major phase of Grenvillian thermotectonic activity (Ottawan Orogeny) at ca. 1090-1030 Ma. Proposed tectonic models require that the Lowlands were either laterally separated from the Highlands or were at structurally higher levels during this metamorphism. New U/Pb and Ar hornblende ages at 1000 Ma within the shear zone. Thermobarometric constraints indicate that deformation occurred under granulite-facies conditions. Therefore, titanite and hornblende ages are interpreted as cooling ages from a ca. 1050-1030-Ma event. An early transpressive shearing event at ca. 1040 Ma, combined with structural data in the Dana Hill metagabbro that indicate strike-slip displacement along the CCSZ, suggests significant lateral displacement between the Lowlands and the Highlands during the ca. 1090-1030-Ma Ottawan Orogeny, prior to later extension along the CCSZ.

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Section: Discussionmentioning

confidence: 73%

Early History of the Carthage‐Colton Shear Zone, Grenville Province, Northwest Adirondacks, New York (U.S.A.)

Streepey

Johnson

Mezger

et al. 2001

The Journal of Geology

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“…7). Busch et al (1996Busch et al ( , 1997 showed that transpression on the Robertson Lake shear zone (RLSZ) occurred at 1030 Ma. Streepey et al (2001Streepey et al ( , 2002 placed termination of extension on the CCSZ at 945 Ma and that on the RLSZ after 900 Ma.…”

Section: Paleography During the Rigolet Phase Of The Grenville Eventmentioning

confidence: 99%

The Grenville orogenic cycle of southern Laurentia: Unraveling sutures, rifts, and shear zones as potential piercing points for Amazonia

Bartholomew¹,

Hatcher²

2010

Journal of South American Earth Sciences

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“…Integrated geological and geophysical studies derived from the Lithoprobe project (Carr et al, 2000;Corriveau and Morin, 2000;Martignole et al, 2000) and detailed studies across individual shear zones (e.g., Mezger et al, 1992;van der Pluijm et al, 1994;Busch et al, 1997;Cureton, et al, 1997) also constrain histories of the assembly and cooling of midcrustal blocks.…”

Section: Introductionmentioning

confidence: 99%

Oxygen-isotope constraints on terrane boundaries and origin of 1.18–1.13 Ga granitoids in the southern Grenville Province

Peck

Valley²,

Corriveau³

et al. 2004

Memoir 197: Proterozoic Tectonic Evolution of the Grenville Orogen in North America

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Granitic rocks related to 1.18 to 1.13 Ga anorthosite-mangerite-charnockitegranite plutonism stitch three terranes in the southwestern Grenville Province (Adirondack Highlands-Morin terrane, Frontenac terrane, Elzevir terrane). Because of the refractory nature of zircon (Zrn), analysis of oxygen-isotope ratios of dated igneous zircon from these rocks allows calculation of δ δ 18 O values of original magmas even if the rocks were subjected to late magmatic assimilation, postmagmatic alteration, or metamorphism. Documented variability in δ δ 18 O(Zrn) for these granitic rocks corresponds to their geographic location. Seven plutons from the central Frontenac terrane (Ontario) have a high average δ δ 18 O(Zrn) = 11.8 ± ± 1.0‰, which corresponds to δ δ 18 O magma values of 12.4-14.3‰. In contrast, twenty-seven other plutons and dikes of this suite (New York, Ontario, and Québec) average δ δ 18 O(Zrn) = 8.2 ± ± 0.6‰, with a typical igneous range of 8.6 to 10.3‰ for δ δ 18 O magma values. High δ δ 18 O values in the Frontenac terrane are some of the highest magmatic oxygen-isotope ratios recognized worldwide, but these plutons are not unusual with respect to whole-rock chemistry or radiogenic isotope compositions. Such high δ δ 18 O values can result from mixing between paragneiss (δ δ 18 O ≈ ≈ 15‰) and hydrothermally altered basalts and/or oceanic sediments (δ δ 18 O ≈ ≈ 12‰) in the source region. We propose that high-δ δ 18 O, hydrothermally altered basalts and sediments were subducted or underthrust to the base of the Frontenac terrane during closure of an ocean basin between the Frontenac terrane and the Adirondack Highlands at or prior to 1.2 Ga.

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Suturing and extensional reactivation in the Grenville orogen, Canada

Cited by 31 publications

References 21 publications

Early History of the Carthage‐Colton Shear Zone, Grenville Province, Northwest Adirondacks, New York (U.S.A.)

Early History of the Carthage‐Colton Shear Zone, Grenville Province, Northwest Adirondacks, New York (U.S.A.)

The Grenville orogenic cycle of southern Laurentia: Unraveling sutures, rifts, and shear zones as potential piercing points for Amazonia

Oxygen-isotope constraints on terrane boundaries and origin of 1.18–1.13 Ga granitoids in the southern Grenville Province

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