Intracrystalline vorticity record of flow kinematics during shear zone reactivation

Piette-Lauzière, Nicolas; Larson, Kyle P.; Kellett, Dawn A.; Graziani, Riccardo

doi:10.1016/j.jsg.2020.104134

Cited by 12 publications

(3 citation statements)

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“…Quartz misorientation axes with angles between 2° and 10° were plotted and contoured on inverse pole figures with 10° half width, using the approach of Piette‐Lauzière et al. (2020) for recrystallized and relict grains (Cross et al., 2017). Interpretation of the misorientation axes in terms of active slip systems was guided by Neumann (2000).…”

Section: Analytical Methods and Resultsmentioning

confidence: 99%

Structural Architecture and Attenuation of the Ductile Lower Plate of the Ruby Mountain‐East Humboldt Range Metamorphic Core Complex, Northeast Nevada

et al. 2022

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Strongly deformed footwall rocks exposed in metamorphic core complexes (MCC) of the North American Cordillera were exhumed via ductile attenuation, mylonitic shearing, and detachment faulting. Whether these structures accommodated diapiric upwelling or regional extension via low‐angle normal faulting is debated. The Ruby Mountains‐East Humboldt Range MCC, northeast Nevada, records top‐west normal‐sense exhumation of deformed Proterozoic‐Paleozoic stratigraphy and older basement. We conducted 1:24,000‐scale mapping of the southwestern East Humboldt Range, with integrated structural, geochemical, and geochronological analyses to characterize the geometry and kinematics of extension and exhumation of the mylonitized footwall. Bedrock stratigraphy is pervasively intruded by Cretaceous, Eocene, and Oligocene intrusions, but observations of a coherent stratigraphic section show >80% vertical attenuation of Neoproterozoic to Ordovician rocks. These rocks are penetratively sheared with top‐west kinematics. The shear zone thus experienced combined pure‐ and simple‐shear (i.e., general shear) strain. We argue that this shear zone was syn‐/post‐kinematic with respect to Oligocene plutonism because: (a) mylonitic shearing spatially corresponds with preceding Oligocene intrusions; (b) thermochronology reveals that the shear zone experienced substantial cooling and exhumation after Oligocene plutonism; and (c) the mylonites are crosscut by undated, but likely late Oligocene, leucogranite. We propose that Eocene mantle‐derived magmatism and thermal incubation led to Oligocene diapiric upwelling of the middle crust, with ductile stretching focused on the flanks of this upwarp. Regional Basin and Range extension initiated later in the middle Miocene. Therefore, the development of the East Humboldt Range shear zone was not driven by regional extension and coupled detachment faulting.

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Section: Analytical Methods and Resultsmentioning

confidence: 99%

Structural Architecture and Attenuation of the Ductile Lower Plate of the Ruby Mountain‐East Humboldt Range Metamorphic Core Complex, Northeast Nevada

et al. 2022

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“…Intracontinental strike‐slip shear zones are typically steeply dipping, high‐strain discontinuities that accommodate horizontal displacements of crustal fragments in convergent plate settings (Molnar & Dayem, 2010; Molnar & Tapponnier, 1975; Sylvester, 1988; Tapponier et al., 1982; Woodcock & Daly, 1986). The development of a strike‐slip shear zone can influence the long‐term structural history of the crust, often acting as a long‐lived strain conduit long after formation, and can thus record multistage slip/shear records and complex tectonic evolution (Cao & Neubauer, 2016; Piette‐Lauziere et al., 2020; Storti et al., 2003). Quantifying the absolute timing of complex histories that can develop along such zones hinges on how to accurately the episodes of ductile deformation can be separated through geochronology.…”

Section: Introductionmentioning

confidence: 99%

Dating Strike‐Slip Ductile Shear Through Combined Zircon‐, Titanite‐ and Apatite U–Pb Geochronology Along the Southern Tan‐Lu Fault Zone, East China

et al. 2023

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“…Li et al 2016) and record various deformation ± reactivation events (e.g. Piette-Lauzière et al 2020). The geological histories of such environments are further obfuscated when overprinted by a terminal continent-continent collision (e.g.…”

Section: Introductionmentioning

confidence: 99%

Metamorphic and intrusive history of the Hindu Raj region, northern Pakistan

et al. 2023

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The Hindu Raj region of northern Pakistan is situated between the Karakoram to the east and the Hindu Kush to the west. Both the Karakoram and the Hindu Kush are better studied and have well-documented, distinct geological histories. Investigation of the Hindu Raj region has been mainly limited to reconnaissance exploration and as such little is known about its tectonometamorphic history and whether that history is similar to its neighbouring areas. Analysis of new specimens collected along the Yasin Valley within the Hindu Raj region outline mid-to-Late Cretaceous pluton emplacement (ca. 105 and 95 Ma). Some of those plutonic rocks were metamorphosed to ∼750 ± 30 °C and 0.65 ± 0.05 GPa during the ca. 80–75 Ma docking of the Kohistan arc. A record of this collisional event is well-preserved to the west in the Hindu Kush and variably so to the east in the Hunza Karakoram. A subsequent, ca. 61 Ma, thermal event is partially preserved in Rb–Sr geochronology from the Hindu Raj, which overlaps with sillimanite-grade metamorphism in the Hunza portion of the Karakoram region to the east. Finally, apatite U–Pb and in situ Rb–Sr both record a late Eocene thermal/fluid event likely related to the India-Asia collision. These new data outline a complex geological history within the Hindu Raj, one that shares similarities with both adjacent regions. The information about the tectonometamorphic development of the Hindu Raj is important to gaining a detailed view of the geological characteristics of the southern Asian margin prior to the India-Asia collision.

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Intracrystalline vorticity record of flow kinematics during shear zone reactivation

Cited by 12 publications

References 55 publications

Structural Architecture and Attenuation of the Ductile Lower Plate of the Ruby Mountain‐East Humboldt Range Metamorphic Core Complex, Northeast Nevada

Structural Architecture and Attenuation of the Ductile Lower Plate of the Ruby Mountain‐East Humboldt Range Metamorphic Core Complex, Northeast Nevada

Dating Strike‐Slip Ductile Shear Through Combined Zircon‐, Titanite‐ and Apatite U–Pb Geochronology Along the Southern Tan‐Lu Fault Zone, East China

Metamorphic and intrusive history of the Hindu Raj region, northern Pakistan

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