Structure, geochemistry and geochronology of a Penokean Lamprophyre Dike Swarm, Archean Wawa Terrane, Little Presque Isle, Michigan, USA

Craddock, John P.; Anziano, Jennifer; Wirth, Karl; Vervoort, Jeffrey D.; Singer, Brad S.; Zhang, Xifan

doi:10.1016/j.precamres.2007.02.010

Cited by 22 publications

(10 citation statements)

References 97 publications

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“…There are a few, rare reports of primary or overprint strains that are subvertical and/or layer-normal shortening. Similarly, Craddock et al (2007a) have reported a thrust transport-parallel, layer-parallel shortening strain in lamprophyre dike calcite ocelli and dike-margin calcite veins in the foreland of the Penokean orogen (1.85 Ga). Craddock and McKiernan (2007) have reported a combination of transport-parallel, layer-parallel, and layer-normal shortening axes in quartzites of the Baraboo interval across the Mazatzal orogen (1.65 Ga) and interpreted these results to be related to nappe burial.…”

Section: Discussionmentioning

confidence: 77%

Calcite twinning strains in Alpine orogen flysch: Implications for thrust-nappe mechanics and the geodynamics of Crete

Craddock¹,

Klein²,

Kowalczyk³

et al. 2009

Lithosphere

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Recent uplift in Crete, along the Hellenic trench, has exposed the internal portions of Alpine nappes that were transported south along north-dipping thrusts from the middle Cretaceous to the Oligocene (100-20 Ma). Flysch deposited along the leading, southern edge of the Alpine foreland basin dates the timing of nappe transport and contains twinned calcite in synorogenic limestones and calcite veins that record the stress-strain fi elds associated with nappe transport and stacking for a 17 Ma period between 35 and 18 Ma. The fl ysch ages young away from the craton thereby documenting thin-skin thrusting and nappe motion, for the fi rst time, toward the trench.Fossiliferous marine limestones and calcareous shales were deposited in marginal basins on the leading edges of four thrust-nappes in Crete: the higher and older fl ysch deposits (Asteroussia, Pindos) are underlain by younger fl ysch deposits of the Tripolitza and Plattenkalk nappes. The ages of these fl ysch deposits are well constrained and the fl ysch sequences are now found deformed between nappes without visible signs of Alpine metamorphism, except the lowest Plattenkalk fl ysch. Field observations in the fl ysch deposits include variable bedding, vein, fold axis, and kinematic orientations. Twinned calcite in the fl ysch limestones (16 samples, n = 425) and veins (23 samples, n = 612) generally preserve subhorizontal, in-transport shortening and vertical extension; where there is a strain overprint (high negative expected values [NEV]), a vertical shortening strain with transport-parallel extension (~N-S) is preserved. Strain magnitudes are greater in the vein sample suite, and differential stress magnitudes responsible for twinning are −230 bars for the entire sample suite. The tectonic evolution of the region involved thin-skinned shortening with south-vergent nappe formation, from north to south, followed by thrust motion on the Cretan detachment. Today, metamorphosed rocks (i.e., Phyllite-Quartzite unit [PQU]) overlie the basal Plattenkalk nappe placing earlier exhumed rocks of the Asteroussia, Tripolitza, and Pindos nappes on top of high-pressure (HP)-metamorphic rocks of the PQU without the deposition of any fl ysch.

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Section: Discussionmentioning

confidence: 77%

Calcite twinning strains in Alpine orogen flysch: Implications for thrust-nappe mechanics and the geodynamics of Crete

Craddock¹,

Klein²,

Kowalczyk³

et al. 2009

Lithosphere

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“…Although the result is a strain tensor, a similar orientation of the stress tensor appears likely in case of coaxial deformation (Turner 1953(Turner , 1962. The CSGT has been used to constrain strain tensor directions in veins (Kilsdonk and Wiltschko 1988;Paulsen et al 2014), limestones (Engelder 1979;Spang and Groshong 1981;Wiltschko et al 1985;Craddock and van der Pluijm 1988;Mosar 1989;Ferrill 1991;Craddock et al 2000), marble (Craddock et al 1991), amygdaloidal basalts (Craddock and Pearson 1994;Craddock et al 1997Craddock et al , 2004, and lamprophyres (Craddock et al 2007).…”

Section: Methodsmentioning

confidence: 99%

Volcanic Initiation of the Eocene Heart Mountain Slide, Wyoming, USA

Malone

Craddock

Schmitz

et al. 2017

The Journal of Geology

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Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. A B S T R A C TThe Eocene Heart Mountain slide of northwest Wyoming covers an area of as much as 5000 km 2 and includes allochthonous Paleozoic carbonate and Eocene volcanic rocks with a run-out distance of as much as 85 km. Recent geochronologic data indicated that the emplacement of the slide event occurred at ∼48.9 Ma, using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) extracted from U-Pb zircon ages from basal layer and injectite carbonate ultracataclasite (CUC). We now refine that age with U-Pb results from a lamprophyre diatreme that is temporally and spatially related to the CUC injectites. The ages for the lamprophyre zircons are 48.97 5 0.36 Ma (LA-ICPMS) and 49.19 50.02 Ma (chemical abrasion isotope dilution thermal ionization mass spectrometry). Thus, the lamprophyre and CUC zircons are identical in age, and we interpret that the zircons in the CUC were derived from the lamprophyre during slide emplacement. Moreover, the intrusion of the lamprophyre diatreme provided the trigger mechanism for the Heart Mountain slide. Additional structural data are presented for a variety of calcite twinning strains, results from anisotropy of magnetic susceptibility for the lamprophyre and CUC injectites and alternating-field demagnetization on the lamprophyre, to help constrain slide dynamics. These data indicate that White Mountain experienced a rotation about a vertical axis and minimum of 357 of counterclockwise motion during emplacement.

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“…Although the result is actually a strain tensor, a similar orientation of the stress tensor appears likely in the case of coaxial deformation [26,27]. The CSGT has been used to constrain strain tensor directions in veins [28], limestones [17,[29][30][31][32][33][34], marble [35,36] and lamprophryes [37].…”

Section: Calcite Twin Analysismentioning

confidence: 99%

Twinning Strains in Synfolding Calcite, Proterozoic Sinian System, China

2018

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Synfolding calcite was precipitated between layers of Neoproterozoic sandy dolomite and striated parallel to the fold axis of an open anticline with a shallow plunge during folding. The fold had limb dips of 45 • and plunged 20 • to the south. The synfolding calcite had sub-horizontal grooves that trended parallel to the fold. Limb-hinge-limb calcite samples (3 samples; n = 100 grains) preserved a layer-parallel shortening strain that trended at an acute (45 • ) angle to the trend of the fold axis and fold lineations. Extension axes were vertical and there was no strain overprint (low NEVs). Shortening strain magnitudes were −2.9% and the differential stress responsible for twinning was −38 MPa. The commonly observed structures were layer-parallel slip striations normal to the fold axis: sub-horizontal interlayer slip surfaces parallel to a fold axis (parallel to bedding strike) were unreported; as was a sub-horizontal shortening strain at an acute angle to the axis of a plunging fold. is greatly appreciated. Avdievitch was supported by a Wallace grant from Macalester College.Author Contributions: John P. Craddock (field, strain measuring, writing), Junlai Liu (field and writing), and Yuanyuan Zheng (field and writing). The authors appreciate the constructive and helpful critiques by two anonymous reviewers. Conflicts of Interest:We have no conflicts of interest to declare.

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Structure, geochemistry and geochronology of a Penokean Lamprophyre Dike Swarm, Archean Wawa Terrane, Little Presque Isle, Michigan, USA

Cited by 22 publications

References 97 publications

Calcite twinning strains in Alpine orogen flysch: Implications for thrust-nappe mechanics and the geodynamics of Crete

Calcite twinning strains in Alpine orogen flysch: Implications for thrust-nappe mechanics and the geodynamics of Crete

Volcanic Initiation of the Eocene Heart Mountain Slide, Wyoming, USA

Twinning Strains in Synfolding Calcite, Proterozoic Sinian System, China

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