Multi-stage evolution of the South Tibetan Detachment System in central Himalaya: Insights from carbonate-bearing rocks

Nania, Laura; Montomoli, Chiara; Iaccarino, Salvatore; Leiss, Bernd; Carosi, Rodolfo

doi:10.1016/j.jsg.2022.104574

Cited by 8 publications

(3 citation statements)

References 137 publications

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“…2017b; Nania et al . 2022). The occurrence of the STDS at the top of the GHS and of the MCTz at its bottom, as two coeval north-dipping shear zones with opposite kinematics, played a key role in shaping the Himalayas and exhuming the GHS.…”

Section: Geological Settingmentioning

confidence: 99%

“…Crustally derived, Oligo-Miocene leucogranite intrusions (Searle, 2010(Searle, , 2013Visonà et al 2012, Weinberg, 2016, such as the Manaslu granite (Guillot et al 1995;Cottle et al 2019), are abundant in the upper part of the GHS. Tectonically above the GHS, unmetamorphosed sedimentary rocks (Frank & Fuchs, 1970;Garzanti, 1999) with minor amphibolite facies rocks (Antolín et al 2011; (Burg et al 1984;Burchfiel et al 1992;Carosi et al 1998;, Kellett et al 2010Searle, 2010;Iaccarino et al 2017b;Nania et al 2022). The occurrence of the STDS at the top of the GHS and of the MCTz at its bottom, as two coeval northdipping shear zones with opposite kinematics, played a key role in shaping the Himalayas and exhuming the GHS.…”

Section: A the Himalayasmentioning

confidence: 99%

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Constraining the evolution of shear zones in the Himalayan mid crust in Central–Western Nepal: implications for the tectonic evolution of the Himalayan metamorphic core

et al. 2023

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Structural analysis, petrochronology and metamorphic petrology enable identification and bracketing of the timing of a newly mapped high-temperature ductile shear zone (Jagat Shear Zone (JSZ)) in the Himalayan metamorphic core in Central-Western Nepal. In situ U-Th-Pb monazite petrochronology constrains the timing of top-to-the-S/SW shearing between 28–27 Ma and 17 Ma. Burial and prograde metamorphisms in footwall rocks were linked to thrust-sense movement along the JSZ, while the hanging wall rocks were retrogressed and exhumed. The identification and age of the JSZ (as part of a regional system of shear zones: the High Himalayan Discontinuity (HHD)) coupled with the localization and timing of activity of the Main Central Thrust (MCT) (i) fills a gap in tracing the HHD along orogenic strike, (ii) supports the identification of the position and timing of the long-debated MCT and (iii) helps to place the boundaries of the Himalayan metamorphic core and its internal architecture. Thus, our study is a significant step towards a precise identification of the burial, assembly and exhumation mechanisms of the Himalayan metamorphic core.

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Section: Geological Settingmentioning

confidence: 99%

Section: A the Himalayasmentioning

confidence: 99%

Constraining the evolution of shear zones in the Himalayan mid crust in Central–Western Nepal: implications for the tectonic evolution of the Himalayan metamorphic core

et al. 2023

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“…In fact, contrary to the first proposed models, where the deformation in shear zones has been related only to simple shear, it is now widely accepted that high-strain zones evolve through the combination of simple and pure shear components (see Xypolias, 2010 andFossen &Cavalcante, 2017 for a review). Also, different amounts of pure and simple shear relative to the structural distance from the shear zone are often recognizable (Fossen & Cavalcante, 2017;Nania et al, 2022;Petroccia et al, 2022a). Therefore, the quantitative estimation of flow kinematics in sheared rocks is necessary for investigating the nature and spatial distribution of the deformation within shear zones (e.g., Law et al, 2004;Carosi et al, 2006;Xypolias & Kokkalas, 2006;Forte & Bailey, 2007;Thigpen et al, 2010;Ring et al, 2015;Nabavi et al, 2017;Montemagni et al, 2020;Ortolano et al, 2020;Simonetti et al, 2021;Montemagni & Zanchetta, 2022).…”

Section: Introductionmentioning

confidence: 99%

Spatial variation of pure and simple shear across transpressive shear zones: flow kinematics map of the Posada-Asinara shear zone (NE Sardinia, Italy)

Petroccia¹

2023

ROL

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Flow kinematics estimations are necessary to determine how the deformation is partitioned in shear zones at different scales. Combining different scales of structural analysis with quantitative vorticity constraint allows a more rigorous examination of the kinematics of deformation. The Posada-Asinara shear zone (PASZ) in northern Sardinia (Italy) is a crustal-scale km-thick transpressive shear zone, separating the High-from the Medium-Grade Metamorphic Complex. After microstructural analysis, the vorticity of the flow was estimated to investigate the southernmost boundary of the PASZ, highlighting a dominant pure shear component far from the core of the shear zone. These results have been integrated with existing data to derive a regional-scale flow kinematic map of the Baronie region, highlighting the potentiality of automated geostatistical mapping to become a powerful complementary tool in the investigation of flow kinematics in collisional environments.

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CPO and quantitative textural analyses within sheath folds

Fazio,

Alsop,

Nania

et al. 2024

Journal of Structural Geology

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Multi-stage evolution of the South Tibetan Detachment System in central Himalaya: Insights from carbonate-bearing rocks

Cited by 8 publications

References 137 publications

Constraining the evolution of shear zones in the Himalayan mid crust in Central–Western Nepal: implications for the tectonic evolution of the Himalayan metamorphic core

Constraining the evolution of shear zones in the Himalayan mid crust in Central–Western Nepal: implications for the tectonic evolution of the Himalayan metamorphic core

Spatial variation of pure and simple shear across transpressive shear zones: flow kinematics map of the Posada-Asinara shear zone (NE Sardinia, Italy)

CPO and quantitative textural analyses within sheath folds

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