Deformation of the Diana syenite and Carthage-Colton mylonite zone: Implications for timing of Adirondack Lowlands deformation

Baird, Graham B.; MacDonald, W. D.

doi:10.1130/0-8137-1197-5.285

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…states that no axial-planar structures or parasitic structures are associated with this last phase of folding. Further, the cross folds have been diffi cult to explain because they traverse across the Carthage-Colton mylonite zone and are reportedly present in both the Highlands and Lowlands (Wiener et al, 1984), though evidence for them has not been found along the CarthageColton mylonite zone in central portions of the Diana syenite (Baird and MacDonald , 2004). Tewkesbury (1993) suggested that the apparent dome-and-basin pattern in the Lowlands could have been created by sheath folding, causing highly curved hinges as the result of regional ductile shear during the second-phase of the four-phase model.…”

Section: Foldsmentioning

confidence: 96%

“…However, this could be a local phenomenon associated with proximity to the Carthage-Colton mylonite zone (CCMZ; Figs. 1B and 2), the boundary between the Adirondack Lowlands and Highlands (Geraghty et al, 1981;Mezger et al, 1992;Streepey et al, 2001;Baird and MacDonald, 2004;Johnson et al, 2004;Selleck et al, 2005) where Wiener's (1983) detailed work was focused. However, Tewkesbury (2010, personal commun.)…”

Section: Foldsmentioning

confidence: 99%

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Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Baird

Shrady

2011

Geosphere

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Determining the relationship among crustal blocks within an orogen is a key factor in understanding the architecture and construction of that orogen. Within the large, mid-Proterozoic Grenville Province, the relationship between the Adirondack Lowlands and the adjacent Frontenac terrane is ambiguous. Review of previous work demonstrates that the Adirondack Lowlands have different plutonic suites, a lower grade of metamorphism, and a different geochemical signature. However, the timing and kinematics of deformation in the Lowlands, and their relation to major orogenic events, have not previously been well constrained, making comparisons with the Frontenac terrane diffi cult.On the northwestern edge of the Adirondack Lowlands, detailed structural analysis of upper-amphibolite grade migmatites and marbles reveals two penetrative deformation phases. Interference of F 1 and F 2 folds results in Type 3 fold interference patterns and is suffi cient to produce the regional map patterns. The Noname ductile shear zone, a 0.5-2-km-wide northeast-striking steep ductile shear zone with subvertical lineation, developed during D 2 . The steep geometry of the Noname ductile shear zone, paired with consistent sinistral kinematic indicators only found in subhorizontal surfaces, indicate that kinematics for D 2 was sinistral transpression.Sensitive high-resolution ion microprobereverse geometry (SHRIMP-RG) U-Pb zircon geochronology from three granitic samples that have well-defi ned relationships with D 1 and D 2 indicates that both deformation phases developed through continuous or progressive deformation during ca. 1185-1145 Ma. Zircon geochronology from a quartzite, and the presence of melt during all deformation phases, demonstrate that metamorphism was synchronous with deformation.This work reveals that the Shawinigan orogeny (1190-1140 Ma) developed the dominant structural features observed in the northwest Adirondack Lowlands. These structures are the result of the northward collision of a rifted slice of the Laurentian margin (Adirondis) into previously accreted terranes on the margin of Laurentia. Shawinigan deformation of the Adirondack Lowlands may have outlasted that of the Frontenac terrane across any potential terrane-bounding shear zone. While Frontenac terrane and Adirondack Lowlands geology are suffi ciently distinct to warrant separate terrane designation, evidence is lacking to indicate that a suture exists between them.

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Section: Foldsmentioning

confidence: 96%

Section: Foldsmentioning

confidence: 99%

Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Baird

Shrady

2011

Geosphere

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“…Titanites are hosted in the 1164 ± 11 Ma (SHRIMP U-Pb zircon; Hamilton et al, 2004) Diana metasyenite, a member of the regionally extensive anorthosite-mangerite-charnockitegranite (AMCG) plutonic suite emplaced during the later part of the 1190-1140 Ma Shawinigan phase of the Grenville orogeny and subsequently deformed at granulite-facies metamorphic conditions during the 1090-1020 Ma Ottawan phase (McLelland et al, 2010). Previous studies found evidence for multiple deformation events within the broader CCMZ (Wiener, 1983;Baird and MacDonald, 2004), including an earlier oblique-slip event (Geraghty et al, 1981;Streepey et al, 2001;Johnson et al, 2004) and a later extensional event . These events are also represented in the Harrisville outcrops (Bonamici et al, 2014), where an early protomylonite foliation (S 1 ) is crosscut by ≥ 100 steeply dipping ultramylonite shear zones (S 2 ), which are themselves transposed by a later, moderately dipping foliation (S 3 ) (Fig.…”

Section: Geological Setting and Backgroundmentioning

confidence: 98%

Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation

et al. 2015

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Titanite is an important U-Pb chronometer for dating geologic events, but its high-temperature applicability depends upon its retention of radiogenic lead (Pb). Experimental data predict similar rates of diffusion for lead (Pb) and oxygen (O) in titanite at granulite-facies metamorphic conditions (T = 650-800°C). This study therefore investigates the utility of O-isotope zoning as an indicator for U-Pb zoning in natural titanite samples from the Carthage-Colton Mylonite Zone of the Adirondack Mountains, New York. Based on previous field, textural, and microanalytical work, there are four generations (types) of titanite in the study area, at least two of which preserve diffusion-related δ 18 O zoning. U-Th-Pb was analyzed by SIMS along traverses across three grains of type-2 titanite, which show well-developed diffusional δ 18 O zoning, and one representative grain from each of the other titanite generations. Type-2 and type-4 titanites show broadly core-to-rim decreasing 206 Pb/ 238 U zoning, consistent with Pb diffusion at higher temperatures, and uniform or even slightly increasing 206 Pb/ 238 U near grain rims, indicating subsequent recrystallization and/or new growth below the Pb blocking temperature. Type-2 and type-4 grain cores preserve ca. 1160 Ma ages that correlate with the anorthositemangerite-charnockite-granite magmatic phase of the Grenville orogeny, whereas grain rims give ca. 1050 Ma 206 Pb/ 238 U ages that coincide with the culminating Ottawan phase. The type-3 titanite grain was sampled from a vein and yields 206 Pb/ 238 U dates older than the syenite into which the vein was emplaced; accordingly, its 206 Pb/ 238 U dates are interpreted as indicating excess uncorrected common Pb. Type-2 grains with recrystallized or shear-eroded margins show truncated or reversed 206 Pb/ 238 U zoning but retain symmetrically decreasing δ 18 O zoning, consistent with grain margin modification following arrest of Pb diffusion but before arrest of O diffusion. It is concluded that O diffusion was slightly faster than Pb diffusion in Adirondack titanites at the conditions of (local) peak Ottawan metamorphism, making δ 18 O zoning a useful discriminator of closed-system age domains that did not suffer Pb loss. In addition, the small offset in the O and Pb partial retention zones constrains the timing and temperature of oblique-slip deformation along the Carthage-Colton Mylonite Zone: the details of porphyroclast microstructure and zoning data show that the oblique-slip shear zones were active at ca. 1050 Ma, with deformation initiating near the peak of Ottawan metamorphism at~700°C and continuing through the O blocking temperature at~550°C.Published by Elsevier B.V.

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“…The complexity of deformation and resulting implications within part of the Diana Complex segment of the CCMZ were considered by Baird and MacDonald (2004), while Bonamici et al (2011Bonamici et al ( , 2014Bonamici et al ( , 2015 provided a robust microstructural and isotopic analysis of sphene from two expansive outcrops in this area ("east, " here called H1; and "west"; Fig. 2).…”

Section: The Carthage-colton Mylonite Zonementioning

confidence: 99%

“…The regional mylonitic fabric (Hargraves, 1969;Geraghty et al, 1981;Baird and MacDonald, 2004;Fig. 2) in the Diana Complex is nearly ubiquitous within the CCMZ and is penetrative in outcrops throughout the field area.…”

Section: Regional Mylonitic Fabricmentioning

confidence: 99%

Late Ottawan orogenic collapse of the Adirondacks in the Grenville province of New York State (USA): Integrated petrologic, geochronologic, and structural analysis of the Diana Complex in the southern Carthage-Colton mylonite zone

Baird

2020

Geosphere

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Crustal-scale shear zones can be highly important but complicated orogenic structures, therefore they must be studied in detail along their entire length. The Carthage-Colton mylonite zone (CCMZ) is one such shear zone in the northwestern Adirondacks of northern New York State (USA), part of the Mesoproterozoic Grenville province. The southern CCMZ is contained within the Diana Complex, and geochemistry and U-Pb zircon geochronology demonstrate that the Diana Complex is expansive and collectively crystallized at 1164.3 ± 6.2 Ma. Major ductile structures within the CCMZ and Diana Complex include a northwest-dipping penetrative regional mylonitic foliation with north-trending lineation that bisects a conjugate set of mesoscale ductile shear zones. These ductile structures formed from the same 1060–1050 Ma pure shear transitioning to a top-to-the-SSE shearing event at ∼700 °C. Other important structures include a ductile fault and breccia zones. The ductile fault formed immediately following the major ductile structures, while the breccia zones may have formed at ca. 945 Ma in greenschist facies conditions. Two models can explain the studied structures and other regional observations. Model 1 postulates that the CCMZ is an Ottawan orogeny (1090–1035 Ma) thrust, which was later reactivated locally as a tectonic collapse structure. Model 2, the preferred model, postulates that the CCMZ initially formed as a subhorizontal mid-crustal mylonite zone during collapse of the Ottawan orogen. With continued collapse, a metamorphic core complex formed and the CCMZ was rotated into is current orientation and overprinted with other structures.

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Deformation of the Diana syenite and Carthage-Colton mylonite zone: Implications for timing of Adirondack Lowlands deformation

Cited by 5 publications

References 17 publications

Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Timing and kinematics of deformation in the northwest Adirondack Lowlands, New York State: Implications for terrane relationships in the southern Grenville Province

Combined oxygen-isotope and U-Pb zoning studies of titanite: New criteria for age preservation

Late Ottawan orogenic collapse of the Adirondacks in the Grenville province of New York State (USA): Integrated petrologic, geochronologic, and structural analysis of the Diana Complex in the southern Carthage-Colton mylonite zone

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