 | | Report (chapter) | | 2015 Muscovite 40Ar/39Ar ages help reveal the Neogene tectonic evolution of the southern Annapurna Range...Range, central Nepal AARON J. MARTIN1*, PETER COPELAND2 & JEFFREY A. BENOWITZ3 1 Department of Geology...martinaj@geol.umd.edu) Abstract: We present new muscovite 40Ar/39Ar ages from thirteen Greater Himalayan...north-trending transects across the southern Annapurna Range. Combining the new data with previously...the tectonic development of the southern Annapurna. Muscovite cooling ages from Greater Himalayan rocks |  | | Journal (article/letter/editorial) | | of Proterozoic Lesser Himalayan rocks in central Nepal Aaron J. Martin a,∗ , Katherine D. Burgy a , Alan...isotopes a b s t r a c t In the Himalaya of central Nepal, uncertainty in the absolute depositional ages and...base of the Lesser Himalayan series in central Nepal, 441 new U/Pb isotopic ages of detrital zircons...apparently different units in different parts of Nepal, leads us to recommend abandoning the term “Kushma...lower Fagfog Formation is present in the Kali Gandaki region but apparently pinches out to the east because |  | | Journal (article/letter/editorial) | | Lesser Himalayan rocks exposed in the Modi Khola valley, central Nepal Aaron J. Martin Æ Jibamitra Ganguly...detailed structural mapping in the Modi Khola valley of central Nepal reveal that large displacement thrust-sense...assemblages in the samples collected from the Modi Khola valley record only one episode of metamorphism to... IYSZ Garhwal STDS INDIA M RT RT Delhi Annapurna Kathmandu 500 km CT 84° DT MBT BHUTAN Br...utra ve r MFT MC m NEPAL Indus River Fig. 1 Generalized geologic map of Nepal modified from Amatya |  | | Journal (article/letter/editorial) | | Himalayan metamorphic core between the Annapurna and Dhaulagiri, central Nepal J . - C . VA NN AY 1 A N D K ....metamorphic core of the Himalaya in the Kali Gandaki valley of central Nepal corresponds to a 5-km-thick sequence...overlying low-grade Tethyan Zone (TZ) by the Annapurna Detachment. Structural, petrographic, geothermobarometric...thrusting along the MCT and extension along the Annapurna Detachment. These results suggest an earlier equilibration...GHS during its thrusting on the colder LHS. The Annapurna Detachment is considered to be a Neohimalayan |  | Larson, Kyle P., Ambrose, Tyler K., Webb, A. Alexander G., Cottle, John M., Shrestha, Sudip (2015) Reconciling Himalayan midcrustal discontinuities: The Main Central thrust system. Earth and Planetary Science Letters, 429. 139-146 doi:10.1016/j.epsl.2015.07.070 | Journal (article/letter/editorial) | | 31 July 2015 Editor: A. Yin Keywords: Himalaya Nepal Main Central thrust kinematic evolution a b s t...of the exhumed midcrustal core in west-central Nepal (Carosi et al., 2010; Corrie and Kohn, 2011; Kohn...structures. Timing constraints are from western Nepal (Montomoli et al., 2013). STDS – South Tibetan Detachment...developed for structures observed in west-central Nepal. There, along the Himalayan front, the GHS can be...contrasts sharply with the GHS exposed in eastern Nepal and neighboring regions where it is in excess of |  | | Journal (article/letter/editorial) | | of the Greater Himalayan Sequence, Annapurna Himalaya, central Nepal: Insights from titanite petrochronology...Short title: Titanite reveals long-lived thrust in Nepal ABSTRACT The Greater Himalayan Sequence (GHS) has...this study, we examine this concept in central Nepal by integrating temperature-time (T-t) paths, based...previously-identified intra-GHS thrusts in central Nepal, and thrusting duration was 3-6 Ma longer than proposed...sheets in Nepal. The overlap in high temperature titanite U-Pb ages and previously published muscovite 40Ar/39Ar |  | Zhang, Lin‐Kui, Li, Guang‐Ming, Cao, Hua‐Wen, Zhang, Zhi, Dong, Sui‐Liang, Liang, Wei, Fu, Jian‐Gang, Huang, Yong, Xia, Xiang‐Biao, Dai, Zuo‐Wen, Pei, Qiu‐Ming, Zhang, Shou‐Ting (2020) Activity of the south Tibetan detachment system: Constraints from leucogranite ages in the eastern Himalayas. Geological Journal, 55 (7). 5540-5573 doi:10.1002/gj.3756 | Journal (article/letter/editorial) | | synkinematic leucogranite is the garnet-bearing muscovite granite in Cuonadong at 18.4 Ma. The oldest undeformed...leucogranite (not affected by the STDS) is the muscovite granite in Xiaozhan at 17.4 Ma. Therefore, the...ductile deformation; the other kind is undeformed muscovite leu- by undeformed leucogranite dykes. cogranite...obviously recrystallized quartz, and biotite and muscovite formed (postkinematic) leucogranites, it can...mineral deformation characteristics of undeformed muscovite leu- equivalent to or slightly earlier than that |  | | Journal (article/letter/editorial) | | Thermal evolution of the Lesser Himalaya, central Nepal: Insights from K-white micas compositional variation...low- to medium-grade metamorphic rocks in central Nepal are rich in K-white micas occurring as porphyroclasts...metamorphism; Lesser Himalaya; Nepal 1. Introduction The Lesser Himalaya (LH) in central Nepal consists of low- to...Geology, Tribhuvan University, Kirtipur, Kathmandu, Nepal. Tel./fax: +81 86 2569669. E-mail address: lalupaudel67@yahoo...the Higher Himalaya and the MCT zone in central Nepal (e.g., Le Fort, 1975; Pêcher, 1975; Arita, 1983; |  | | Book | | subdivision of the Himalayan belt is valid for India and Nepal sectors. The Pakistan sector has difficulties in...Capital Publishing Company, New Delhi.) central Nepal (Fig. 1.2). The HHC sequence overlying MCT2 is named...grade metamorphism in the HHC zone of the Himachal Pradesh covering areas like Kullu, Manali, Rohtang, and...Lithotectonic Subdivisions of the Himalaya In the Darma Valley of Kumaon Himalaya, Thakur (1977) described a divergent...continuous from Pakistan in the west to Arunachal Pradesh with a gap in Bhutan. Active sedimentation in the |  | | Report (chapter) | | the tectonic evolution of the High Himalaya in Nepal: the art of the possible David John Waters DOI:...the tectonic evolution of the High Himalaya in Nepal: the art of the possible 2 Department of Earth...Abbreviated title: High Himalayan metamorphism, Nepal A N Abstract A CC EP T ED M This review...Himalayan Sequence (GHS) and adjacent units in Nepal, in the light of recent research. The importance...Sequence (GHS) and its upper and lower boundaries, in Nepal and adjacent parts of South Tibet (Fig. 1). Downloaded |  | | Report (chapter) | | such as the Kalopani and the Modi –Khola shear zones in central Nepal (Hodges et al. 1996; Vannay &...2003; Grujic et al. 2012), the Tamor –Khola Thrust in far-eastern Nepal (Schelling & Arita 1991) and the Trisuli...Trisuli –Likhu Fault in the Kathumandu Nappe, central Nepal (Arita et al. 1997). According to Mukherjee et al...earlier exhumation of the GHSu at least in western Nepal (Carosi et al. 2010; Montomoli et al. 2013). The...values of 2–3 km in western Nepal (Carosi et al. 2002, 2007), 30 km in eastern Nepal and Bhutan (Daniel et |  | | Journal (article/letter/editorial) | | garnets from a semipelitic schist from central Nepal reveal parallel, spiraling bands of high and low...Formation, exposed in the Modi Khola valley of the western Annapurna Range, central Nepal (outcrop location 28363958N...The sample location is on the west side of the valley at nearly the same structural position as the location...the hanging wall of the Ramgarh thrust. In the Annapurna Range, the exposed part of the Lesser Himalayan...heterogeneity in a semi-pelitic schist from central Nepal not only at the centimeter to quartermillimeter |  | | Book | | Geology Reviews Megh Raj Dhital Geology of the Nepal Himalaya Regional Perspective of the Classic Collided...from Tatopani Megh Raj Dhital Geology of the Nepal Himalaya Regional Perspective of the Classic Collided...Geology Tribhuvan University Kirtipur, Kathmandu Nepal ISBN 978-3-319-02495-0 ISBN 978-3-319-02496-7 DOI...geological setup as Nepal. Forming a bridge between the Western and Eastern Himalaya, Nepal occupies a pivotal...time span from the Proterozoic to Holocene, the Nepal Himalaya preserves unique geological events. Varied |  | | Journal (article/letter/editorial) | | Details of geology o f the study area, namely, Nepal (1), Sikkim (2) and Bhutan (3) are given in Figs...rocks. I n H i m a c h a l Pradesh, N e p a l a n d A r u n a c h a l Pradesh d e f o r m e d granite sheets...Himachal Pradesh, 2 = West Nepal, 3 = East Nepal, 4 = Sikkim, 5 = Bhutan, 6 = Arunachal Pradesh, B = Buxa...areas of the Himalayas not discussed. Nepal Himalayas In Central Nepal mylonitic granite has been described...(1975), and P~cher and Le Fort {1977). In the Modi Khola valley augen gneiss occurs within the Daling equivalent |  | | Journal (article/letter/editorial) | | granite and Tibetan Slab migmatites in central Nepal P. Barbey a, M. Brouand b, P. Le Fort ‘, A. P&her...1995; accepted 1 February 1996 Abstract In central Nepal, the Tibetan Slab is made up of biotite-gneisses...migmatites. Melanosomes are generally biotite-( f muscovite)-bearing, but locally they may be tourmaline-rich...top of the Tibetan Slab. It corresponds to a muscovite-biotite leucogranite that has been assumed to...Lithos 38 (1996163-79 in the Himalaya (Central Nepal), that has been assumed to derive from the underlying |  | | Journal (article/letter/editorial) | | to 633–667 °C in the kyanite and sillimanite-muscovite zones, and northwards to greenschist facies at...within the GHC in the Langtang (Kohn, 2008) and Annapurna regions (Corrie & Kohn, 2011). However, few detailed... 2012) is recognized within the GHC in eastern Nepal (Fig. 1), it is still unclear whether thrusts commonly...characterized by abundant interlayered leucosome, muscovite-absent mesosome and melanosome (Fig. 4c), formed...leucogranite dykes. Mica fish in the mylonitized muscovite leucogranite from the top GHC show top-to-the-north |  | | Journal (article/letter/editorial) | | core in the Accepted Article Likhu Khola region, East Central Nepal S. SHRESTHA1, K. P. LARSON1, C. GUILMETTE2...ubc.ca Short Title P-T-t evolution of the Likhu Khola region This article has been accepted for publication...dating of the metapelites from Likhu Khola region in east-central Nepal, combined with previously published...wellexposed portion of the HMC in the Likhu Khola region of east central Nepal (Figure 1b; From et al., 2014), combining...HMC. 2. LIKHU KHOLA REGION Reconnaissance scale mapping that included the Likhu Khola region was carried |  | Girault, Frédéric, Perrier, Frédéric, Gajurel, Ananta Prasad, Bhattarai, Mukunda, Koirala, Bharat Prasad, Bollinger, Laurent, Fort, Monique, France-Lanord, Christian (2012) Effective radium concentration across the Main Central Thrust in the Nepal Himalayas. Geochimica et Cosmochimica Acta, 98. 203-227 doi:10.1016/j.gca.2012.09.001 | Journal (article/letter/editorial) | | concentration across the Main Central Thrust in the Nepal Himalayas Frédéric Girault a,⇑, Frédéric Perrier...Campus, Tribhuvan University, Ghantaghar, Kathmandu, Nepal c National Seismological Centre, Department of Mines...Mines and Geology, Lainchaur, Kathmandu, Nepal d Département Analyse Surveillance Environnement, CEA...of 622 rock samples from 6 different sites in the Nepal Himalayas was measured in the laboratory using radon...sites, located from Lower Dolpo in Western Nepal to Eastern Nepal, are divided into 9 transects which cut |  | He, Dian, Webb, A. Alexander G., Larson, Kyle P., Martin, Aaron J., Schmitt, Axel K. (2015) Extrusion vs. duplexing models of Himalayan mountain building 3: duplexing dominates from the Oligocene to Present. International Geology Review, 57 (1) 1-27 doi:10.1080/00206814.2014.986669 | Journal (article/letter/editorial) | | modification to the structural framework of the central Nepal Himalaya would alter our understanding of the extrusion...appears to be compelling evidence in the central Nepal Himalaya, but it has as yet been documented at only...results obtained in the Dadeldhura klippe of western Nepal are presented in a companion paper (He et al. 2014)...2010). The Kathmandu Nappe is located in central Nepal with Kathmandu city near its centre (Figure 3)....81° HHT Mt. Everest Shishapangma Dhaulagiri Annapurna A’ N 28° Cambrian-Ordovician granite B’ 3°E |  | | Report (chapter) | | implications for upper crustal shortening in central Nepal S. KHANAL1*, D. M. ROBINSON1, S. MANDAL1 & P. SIMKHADA2...Department of Mines and Geology, Lainchaur, Kathmandu, Nepal *Corresponding author (e-mail: skhanal@crimson.ua...structural architecture of Himalaya in central Nepal. The Main Central thrust (MCT) is at the base of...confirms its orogenic-scale presence in central Nepal. Supplementary material: U– Pb geochronological...Evidence for the presence of the RMT in central Nepal is presented by Kohn et al. (2004) in the footwall |  | Rapa, Giulia, Groppo, Chiara, Rolfo, Franco, Petrelli, Maurizio, Mosca, Pietro, Perugini, Diego (2017) Titanite-bearing calc-silicate rocks constrain timing, duration and magnitude of metamorphic CO 2 degassing in the Himalayan belt. Lithos, 292. 364-378 doi:10.1016/j.lithos.2017.09.024 | Journal (article/letter/editorial) | | solutions, as well as Kbearing phases (biotite, muscovite, K-feldspar). Groppo et al. (2017) also provided...(L-GHS), in the GosainkundHelambu region of central Nepal (N28°00'37.3'', E85°29'50.9''; 3365 m a.s.l.; Fig...PT binary H2O-CO2 fluid. Calcite, K-feldspar, muscovite, paragonite, margarite, kyanite, quartz, CE ...aDi=0.7; aZo=0.75); calcite, kyanite, microcline, muscovite, quartz, titanite, rutile and geikielite pure...modelled at T>650 °C, X(CO2)<0.15. ED At low T, muscovite is stable over a wide range of X(CO2) (i.e. X(CO2)=0 |  | | Journal (article/letter/editorial) | | to 85°E indicates that, the western and central Nepal Himalaya have been thickened by 0.5 and 1–1.5 times...low-relief surface in the Mugu-Dolpa region of west Nepal. We propose that these results can be explained...convergence direction, such as Kumaun and western Nepal Himalaya (McCaffrey, 1992; Platt, 1993). Early efforts...metamorphic core complexes in the Kumaun and western Nepal Himalaya, respectively (Fig. 1). Both exhume mid-crustal...differences in structure suggest that the Kumaun and Nepal Himalaya is an ideal place to study the 3-D strain |  | | Report (issue) | | Fluctuations in the Inner Himalaya (North of the Annapurna and Dhaulagiri Himalaya), by Hermann Achenbach...Pakistan?, by Joseph A. DiPietro and Alex Pullen Muscovite, by Michael Doon, Djordje Grujic, Isabelle Coutand...Fluvial Response in the Tectonically Active Yamuna Valley, North-Western Himalaya: Timescales and Source-to-Sink...Uplift and Exhumation along the Arun River (Eastern Nepal): Implications for the Mechanism of Uplift of the...of Asbestos Mining and Milling in Behram Dehri, District Charssada, Northern Pakistan, by Noor Jehan and |  | Chakraborty, S., Anczkiewicz, R., Gaidies, F., Rubatto, D., Sorcar, N., Faak, K., Mukhopadhyay, D.K., Dasgupta, S. (2016) A review of thermal history and timescales of tectonometamorphic processes in Sikkim Himalaya (NE India) and implications for rates of metamorphic processes. Journal of Metamorphic Geology, 34 (8) 785-803 doi:10.1111/jmg.12200 | Journal (article/letter/editorial) | | garnet zone to ~8 kbar, 700 °C at the sillimanite–muscovite-zone), (iii) clockwise P–T paths of a tight ‘hairpin’...melting was low, as indicated by the presence of muscovite all through the sequence. This evidence indicates...These are separated by a thrust whose equivalent in Nepal has been called the Ramgarh Thrust from the metasedimentary...sillimanite-grade gneiss that still contains muscovite. A sheared granitic gneiss is also exposed in...to the Namche migmatite Orthogneiss in adjacent Nepal (see descriptions in Lombardo et al., 1993; Goscombe |  | | Journal (article/letter/editorial) | | al. 2011a; PT Webb 2013). In the Annapurna Range of central Nepal, South Tibet Detachment footwall meta-...hanging wall siliciclastic Sanctuary and carbonate Annapurna Yellow formations, respectively (Le Fort, 1975;...MCT in the up-dip, foreland direction in central Nepal. Yin (2006) combined these three ideas and proposed...600 °C. In regions such as the PT Annapurna Range of central Nepal, multiple top-to-the-hinterland high...mafic volcanic and AN clastic rocks in central Nepal and Cambrian mostly clastic rocks in Bhutan and |
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