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Statements

Subject Item
n2:RIV%2F00025798%3A_____%2F14%3A00000014%21RIV15-MSM-00025798
rdf:type
skos:Concept n19:Vysledek
rdfs:seeAlso
http://gsabulletin.gsapubs.org/content/126/7-8/892.abstract
dcterms:description
The Zanskar Shear Zone (ZSZ) is a ductile, normal-sense shear zone that exploited the contact between the High Himalayan Crystalline series and the Tethyan Sedimentary Series. The ZSZ is an extension of the South Tibetan Detachment System and in Zanskar accommodated 24 km of normal movement. Early thrusting is preserved in footwall and hanging wall and is overprinted by normal shearing. Thrusting and normal shearing were co-planar and co-directional, with SW-directed thrusting overprinted by NE-directed normal shearing: a simple inversion of movement sense. The telescoped isograds related to normal shearing define a broad pattern of colder rocks on top of hotter. However, we found preserved thrust-related metamorphic series, with hotter rocks on top of colder, severely telescoped by normal shearing. Some determinations of the amount of displacement and thinning on the ZSZ prior to the current work have assumed a steady-state crustal profile and have disregarded pre-existing perturbations of isograds such as indicated here. Miocene leucogranitic intrusions accumulated within and below the normal ZSZ. Intrusions were sheared during thrusting and normal movement and magmatism out-lasted normal shearing. U-Pb SHRIMP data constrain the timing of the switch from thrusting to normal movement to between 26-24 Ma and ~22 Ma. At ~20 Ma normal shearing in eastern ZSZ was no longer active and magmatism was waning producing undeformed leucogranitic dykes. Given the short duration of the normal shearing event and magmatism, we find little support for the hypothesis of channel flow in Zanskar. We propose instead that Miocene anatexis weakened the mid-crustal levels and is the cause of the switch from thrusting to normal fault movement, doming and cooling of the anatectic core of the HHC. The Zanskar Shear Zone (ZSZ) is a ductile, normal-sense shear zone that exploited the contact between the High Himalayan Crystalline series and the Tethyan Sedimentary Series. The ZSZ is an extension of the South Tibetan Detachment System and in Zanskar accommodated 24 km of normal movement. Early thrusting is preserved in footwall and hanging wall and is overprinted by normal shearing. Thrusting and normal shearing were co-planar and co-directional, with SW-directed thrusting overprinted by NE-directed normal shearing: a simple inversion of movement sense. The telescoped isograds related to normal shearing define a broad pattern of colder rocks on top of hotter. However, we found preserved thrust-related metamorphic series, with hotter rocks on top of colder, severely telescoped by normal shearing. Some determinations of the amount of displacement and thinning on the ZSZ prior to the current work have assumed a steady-state crustal profile and have disregarded pre-existing perturbations of isograds such as indicated here. Miocene leucogranitic intrusions accumulated within and below the normal ZSZ. Intrusions were sheared during thrusting and normal movement and magmatism out-lasted normal shearing. U-Pb SHRIMP data constrain the timing of the switch from thrusting to normal movement to between 26-24 Ma and ~22 Ma. At ~20 Ma normal shearing in eastern ZSZ was no longer active and magmatism was waning producing undeformed leucogranitic dykes. Given the short duration of the normal shearing event and magmatism, we find little support for the hypothesis of channel flow in Zanskar. We propose instead that Miocene anatexis weakened the mid-crustal levels and is the cause of the switch from thrusting to normal fault movement, doming and cooling of the anatectic core of the HHC.
dcterms:title
Switch from Thrusting to Normal Shearing in the Zanskar Shear Zone, NW Himalaya: Implications for Channel Flow Switch from Thrusting to Normal Shearing in the Zanskar Shear Zone, NW Himalaya: Implications for Channel Flow
skos:prefLabel
Switch from Thrusting to Normal Shearing in the Zanskar Shear Zone, NW Himalaya: Implications for Channel Flow Switch from Thrusting to Normal Shearing in the Zanskar Shear Zone, NW Himalaya: Implications for Channel Flow
skos:notation
RIV/00025798:_____/14:00000014!RIV15-MSM-00025798
n3:aktivita
n7:P
n3:aktivity
P(LK11202)
n3:cisloPeriodika
7-8
n3:dodaniDat
n9:2015
n3:domaciTvurceVysledku
n11:9842780
n3:druhVysledku
n16:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
48852
n3:idVysledku
RIV/00025798:_____/14:00000014
n3:jazykVysledku
n18:eng
n3:klicovaSlova
channel flow, normal shear movement, High Himalayan leucogranites, South Tibetan Detachment, Zanskar Shear Zone
n3:klicoveSlovo
n13:High%20Himalayan%20leucogranites n13:Zanskar%20Shear%20Zone n13:normal%20shear%20movement n13:South%20Tibetan%20Detachment n13:channel%20flow
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[4406040F071C]
n3:nazevZdroje
Geological Society of America Bulletin
n3:obor
n14:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
4
n3:projekt
n17:LK11202
n3:rokUplatneniVysledku
n9:2014
n3:svazekPeriodika
126
n3:tvurceVysledku
Hasalová, Pavlína Finch, Melanie Weinberg, Roberto Fanning, Mark
n3:wos
000341193900002
s:issn
0016-7606
s:numberOfPages
33
n6:doi
10.1130/B30817.1