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Chekha Formation

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Journal Article
Journal: Lithosphere
Published: 01 February 2013
Lithosphere (2013) 5 (1): 67-81.
...), the hanging wall of the sole structure is instead frequently mapped at the base of a metamorphosed, predominantly siliciclastic succession (the Chekha Formation), and the base of the overlying predominantly carbonate rocks (Pele La and Tang Chu Groups) is mapped as a less significant splay of the South...
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Photographs of deformed granite sills intruding the <b>Chekha</b> <b>Formation</b> within...
Published: 16 April 2019
Figure 5. Photographs of deformed granite sills intruding the Chekha Formation within the South Tibetan detachment system (stop numbers are referenced to Figs. 2 – 4 ). (A) Top-to-NW, boudinaged, ∼10-cm-thick sill within calc-silicate gneiss (stop 22). (B) Boudinaged, ∼20-cm-thick sill within
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Outcrops of Tibetan sedimentary sequence, <b>Chekha</b> <b>Formation</b>, and Greater Him...
Published: 01 February 2013
Figure 5. Outcrops of Tibetan sedimentary sequence, Chekha Formation, and Greater Himalayan sequence units illustrating differences in structural style. Locations are shown in Figure 2 . (A–B) Large-scale recumbent folding in Tibetan sedimentary sequence marbles of the Dang Chu klippe, (A) next
Journal Article
Published: 01 February 2017
Italian Journal of Geosciences (2017) 136 (1): 15-27.
...Djordje Grujic; Isabelle Coutand; Michael Doon; Dawn A. Kellett Abstract Single-grain 40 Ar/ 39 Ar dates are reported for detrital white mica from low-grade meta-arkose samples from the Gondwana Formation in the Darjeeling-Sikkim Himalaya. The majority (61%) of single grains from five samples...
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Photographs and photomicrographs illustrating representative lithologies an...
Published: 14 July 2017
Figure 6. Photographs and photomicrographs illustrating representative lithologies and mineral assemblages observed on the Dang Chu transect, organized from structurally low to high (structural height relative to the basal Chekha Formation contact is listed below). (A) Migmatitic, feldspar-rich
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Photographs and photomicrographs illustrating representative shear-sense in...
Published: 14 July 2017
the same outcrop of GHlo orthogneiss (−2150 m). Upper shear band is top-down-to-southeast, and lower shear band is top-down-to-northwest. (C) Leucosome sheared into top-to-south σ-object within GHlmu paragneiss (−1100 m). (D) Top-to-north SC fabric within Chekha Formation micaceous quartzite (+160 m) (XPL
Journal Article
Published: 14 September 2010
Geological Magazine (2010) 148 (3): 351-379.
... subsequently re-designated as the Thimphu-Chekha Group and divided into the Thimphu Formation and the Chekha Formation (Jangpangi, 1978 ) ( Fig. 2 a). Figure 2 (a) General summary of nomenclature applied to lower Tethyan strata of the Bhutanese outliers. (b) Summary...
Journal Article
Journal: GSA Bulletin
Published: 01 July 2011
GSA Bulletin (2011) 123 (7-8): 1406-1426.
..., 1995 ; Edwards et al., 1996 ; Grujic et al., 2002 ; Kellett et al., 2009 ). The base of the section in all of the Tethyan (or Tibetan) Himalayan exposures has been mapped as the Chekha Formation, which consists of quartzite interbedded with biotite-muscovite-garnet schist. A lack of fossils...
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(A, B) Photomicrographs showing representative examples of non-recrystalliz...
Published: 16 April 2019
] ) versus θ′, with contours of mean kinematic vorticity for plane strain deformation (W m ) plotted (e.g., Tikoff and Fossen, 1995 ). Error bars are 1 SE. (E, F) Graphs of transport-parallel lengthening and transport-normal shortening versus structural height above the base of the Chekha Formation. (G
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(A, B) Diagrams illustrating the change in dimensions (le—transport-paralle...
Published: 16 April 2019
Figure 11. (A, B) Diagrams illustrating the change in dimensions (le—transport-parallel lengthening; sh—transport-normal shortening) of a 10 km x 10 km area of the Chekha Formation (THck) and Paleozoic (THPzu) and Mesozoic Tethyan Himalayan rocks (THMzu) before (A) and after (B) the measured
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All 17 samples plotted in order of peak metamorphic temperature; 13 samples...
Published: 01 February 2013
, Chekha Formation schists, quartzites, and calc-silicates, as well as Greater Himalayan sequence (GHS) paragneisses and schists across all three klippen ( Fig. 2 ). The lack of any temperature difference among the Chekha, Greater Himalayan sequence, and Tibetan sedimentary sequence Maneting Formation
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Tectonostratigraphic column of the Dodena-Lingshi transect (calculated from...
Published: 16 April 2019
observed in outcrop, orange were observed in quartz c -axis plots, and brown were defined by the elongation direction of quartz porphyroclasts), peak and deformation temperature data, and finite strain data versus structural height relative to the base of the Chekha Formation. RSCM—Raman spectroscopy
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Tectonostratigraphic column of the Dang Chu transect, showing mineral phase...
Published: 14 July 2017
(foliation-normal distance; measured from Fig. 4 ) relative to the basal contact of the Chekha Formation. SGR—subgrain rotation; GBM—grain boundary migration without chessboard extinction; CBE—grain boundary migration with chessboard extinction; GBAR—grain boundary area reduction. An explanation of rock
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Alternative geologic interpretations of central Bhutan. (A)  Long and McQua...
Published: 01 February 2013
as a conformable contact. The breakaway zone for the South Tibetan fault system is inferred to lie between the two klippen. (B) Grujic et al. (2011) map the Chekha Formation more extensively across central Bhutan, joining the Dang Chu (DCK) and Zhemgang klippen (ZK) and extending the Ura klippe northward, where
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A: Mosaic of Advanced Spaceborne Thermal Emission and Reflection Radiometer...
in > Geology
Published: 01 November 2012
Figure 2. A: Mosaic of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) emissivity scenes with decorrelation stretch applied using thermal infrared bands 14 (red), 13 (green), and 11 (blue). Black pixels have been masked. Blue-purple areas—siliceous units of the Chekha
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Geological sketch map of the Thimphu-Laya area (modified from  G ansser , 1...
Published: 01 February 2017
Fig. 2 Geological sketch map of the Thimphu-Laya area (modified from G ansser , 1983 ; G rujic et alii , 2002 ; 2011 ; C arosi et alii , 2006 ; L ong et alii , 2011) . 1: Quaternary; 2: Tethyan Sedimentary Sequence; 3: Chekha Formation; 5: Greater Himalyan Sequence; 5: High Himalayan
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(A) Generalized geologic map of the Himalayan-Tibetan orogen (simplified fr...
Published: 16 April 2019
of stretching lineation and crenulation cleavage measurements (generated using Stereonet 8; Allmendinger et al., 2011 ). The STDS is simplified here at the Greater Himalayan–Chekha Formation contact; see Figures 2 – 4 for locations of the upper and lower limits of the STDS zone. undiff.—undifferentiated.
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Our interpretation for the distribution of Raman spectroscopy on carbonaceo...
Published: 01 February 2013
; MBTS—Main Boundary thrust system; LHS—Lesser Himalayan sequence. (A) The Chekha Formation and Greater Himalayan sequence (GHS) are combined as one sequence due to their similar lithology, structural style, and peak metamorphic temperature. The Tibetan sedimentary sequence (TSS) in the Dang Chu klippe
Series: Geological Society, London, Special Publications
Published: 01 January 2006
DOI: 10.1144/GSL.SP.2006.268.01.20
EISBN: 9781862395169
..., Quaternary; 2, leucogranites; 3, Tethyan sediments; 4, Chekha Formation; 5, higher structural levels of the GHS; 6, lower structural levels of the GHS; 7, main bodies of marble; 8, main bodies of amphibolite; 9, main fabric in the sillimanite-bearing gneiss; 10, stretching lineation in sillimanite-bearing...
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Journal Article
Journal: GSA Bulletin
Published: 01 July 2011
GSA Bulletin (2011) 123 (7-8): 1427-1447.
... exposures contain Paleozoic to Mesozoic rocks above a basal quartzite unit called the Chekha Formation ( Gansser, 1983 ; Bhargava, 1995 ; Tangri and Pande, 1995 ). The Chekha Formation lacks fossils, and is mapped stratigraphically below fossiliferous Cambrian units in the Tang Chu exposure ( Bhargava...
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