New interpretations of the ages and origins of the Hawkeye Granite Gneiss and Lyon Mountain Granite Gneiss, Adirondack Mountains, NY: Implications for the nature and timing of Mesoproterozoic plutonism, metamorphism, and deformation

Aleinikoff, John N.; Walsh, Gregory J.; McAleer, Ryan J.

doi:10.1016/j.precamres.2021.106112

Cited by 7 publications

(4 citation statements)

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“…However, this model requires revision because the LMG has now been shown to have crystallized at least 100 Ma prior to formation of the Fe deposits of the eastern Adirondacks J o u r n a l P r e -p r o o f Journal Pre-proof (ALEINIKOFF et al, 2021). TAYLOR et al (2019 suggested that multiple episodes of hydrothermal alteration were responsible for formation of apatite in low-Ti magnetite deposits.…”

Section: Journal Pre-proofmentioning

confidence: 99%

U-Pb systematics of uranium-rich apatite from Adirondacks: Inferences about regional geological and geochemical evolution, and evaluation of apatite reference materials for in situ dating

et al. 2021

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Section: Journal Pre-proofmentioning

confidence: 99%

U-Pb systematics of uranium-rich apatite from Adirondacks: Inferences about regional geological and geochemical evolution, and evaluation of apatite reference materials for in situ dating

et al. 2021

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“…Granulite facies metamorphism was recorded at Oregon dome at 1048 ± 10 Ma and at Snowy Mountain at 1031 ± 30 Ma (Hamilton et al, 2004). This also coincides with other metamorphism in the Highlands including recorded in zircons from anorthosite in the Marcy Massif at 1050-1035 Ma (Peck et al, 2018), metamorphic zircon rims from Hawkeye Granite Gneiss and Lyon Mountain Granite Gneiss dated from 1080-990 Ma (Aleinikoff et al, 2021).…”

Section: Comparison With Zircons From Other Uht Complexessupporting

confidence: 78%

“…Very deformed Hawkeye Granite Gneiss was intruded by the weakly deformed Lyon Mountain Granite Gneiss. Aleinikoff et al (2021) recently used U-Pb SHRIMP analysis to conclude that the Hawkeye granite gneiss was emplaced from 1160 to 1155 Ma and Lyon…”

Section: The Adirondack Highlandsmentioning

confidence: 99%

“…These exhumed deep crustal rocks have undergone extensive investigation especially throughout the Adirondacks (Bickford et al, 2008;McLelland et al, 2013;Rivers, 2015). U-Pb geochronology studies in the Adirondacks have placed metamorphism in the central Highlands around ~1170 to 990 Ma (Chiarenzelli et al, 2017, Peak et al, 2018, Aleinikoff et al, 2021. Metzger et al (2022) reported U-Pb zircon SHRIMP ages from Ledge Mountain migmatites of 1085 ± 13 Ma to 968 ± 5 Ma for recrystallized rims formed following UHT conditions during near-isothermal decompression on the retrograde cooling path metamorphic zircons.…”

Section: Introductionmentioning

confidence: 99%

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Zircon U-Pb Geochronology from Ledge Mountain, Adirondack Highlands, New York

Horsley

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I use a combination of U-Pb SHRIMP zircon geochronology and trace element geochemistry, and interpreted cathodoluminescence imagery of zircons, to better constrain the timing of metamorphism and anatexis in migmatitic granulites from the central Adirondack Highlands. The Adirondack Highlands are a southern extension of the ca. 1 Ga Grenville Province, an orogen that stretches from northeastern Canada to western Texas. The Adirondack Highlands experienced ultrahigh-temperature (UHT) granulite-facies metamorphism and migmatization during the Shawinigan and Ottawan orogenic events within the Grenville. Ledge Mountain migmatites and Snowy Mountain and Oregon anorthosite massifs are part of a proposed gneiss dome that exhumed deep crustal rocks. Migmatite samples are from the western branch of Ledge Mountain and contain rounded, subhedral, to elongate zircons in both the leucosome and the melanosome. In cathodoluminescence (CL) imagery, zircons have thin dark homogeneous rims and core domains with variable CL and a range of textures. Most notable are the zircon domains featuring chaotic zoning with brightnesses ranging from bright to dark and chaotic textures. Faded oscillatory zoning patterns (OZP) were identified in many zircon cores and represent recrystallization that has resulted in a diffusion of igneous OZP. Homogenous zircon textures indicate recrystallization after an anatectic melt from 1037 ± 0.2 to 1029 ± 0.3 Ma. Chaotic zircon textures suggest fluid driven recrystallization during the anatexis and exhumation of the gneiss dome with U-Pb mean ages ranging from 1056 ± 0.2 to 1045 ± 0.3 Ma. These zircon ages suggest metamorphism continued into the mid-to late-Ottawan in the central Highlands and further constrained the timing of the exhumation of these deep crustal rocks. v v vi viTable of Contents List of Tables .

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A natural granite based glass-ceramics matrix for immobilizing simulated An3+ waste

Shu

et al. 2023

Journal of Non-Crystalline Solids

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New interpretations of the ages and origins of the Hawkeye Granite Gneiss and Lyon Mountain Granite Gneiss, Adirondack Mountains, NY: Implications for the nature and timing of Mesoproterozoic plutonism, metamorphism, and deformation

Cited by 7 publications

References 91 publications

U-Pb systematics of uranium-rich apatite from Adirondacks: Inferences about regional geological and geochemical evolution, and evaluation of apatite reference materials for in situ dating

U-Pb systematics of uranium-rich apatite from Adirondacks: Inferences about regional geological and geochemical evolution, and evaluation of apatite reference materials for in situ dating

Zircon U-Pb Geochronology from Ledge Mountain, Adirondack Highlands, New York

A natural granite based glass-ceramics matrix for immobilizing simulated An3+ waste

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