Journal of Himalayan Earth Sciences最新文献

{"title":"The Tso Morari Nappe of the Ladakh Himalaya: formation and exhumation","authors":"J. Epard, A. Steck","doi":"10.3126/HJS.V5I7.1254","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1254","url":null,"abstract":"The Tso Morari Nappe is one of the North Himalayan nappes and is characterized by ultra-high pressure metamorphic rocks. It is composed of graywackes, slates, sandstones and dolomites of the Upper Haimantas and Karsha formations (Vendian-Cambrian). It includes also metabasites. The Tso Morari anatectic granite is dated at 479 Ma (Ordovician, Girard and Bussy 1999) and is intrusive in the Haimantas and Karsha formations. It contains basic dikes, perhaps in part cogenetic. The Tso Morari Nappe is characterized by high to ultra-high pressure metamorphic paragenesis (de Sigoyer at al. 1997, Mukherjee and Sachan 2001) dated at 53 Ma (Leech et al. 2005). Eclogites are absent of the surrounding units. Static eclogite facies crystallization preserves folded boudins of metabasites in the Tso Morari granite. These structures predate the HP metamorphism and can be interpreted as deformation of cogenetic dikes in relation with the Tso Morari granite intrusion. Only sparse deformational structures can be attributed to the ultra-high pressure event. The main schistosity S1 is associated to an E-directed stretching lineation L1 with top-E shear indicators. In general, this is a strong deformation dominated by mylonitic structures. Strain is however heterogeneous and relatively large area of massive, non-deformed granite can be observed. This deformation is related to mineral assemblages of the amphibolite facies attesting a pressure drop and a temperature increase. It is interpreted as associated to the nappe extrusion. A younger deformation D2 is characterized by a N-S trending stretching lineation L2 with topS shear indicators. This deformation is developed at the upper part of the Tso Morari nappe and can be found in the higher Tertaogal and Mata nappes. It has been observed also at the front of the North Himalayan nappes in the Lingti Valley (Epard and Steck 2004). It is interpreted as related to an early phase of north-directed underthrusting of the Tso Morari Nappe below the Tetraogal and Mata nappes. This is coherent with the early N movement of India below Asia (Patriat and Achache 1982). The D2 deformation is superimposed by the D3, L3 deformation with top-SW shear indicators. It is associated to the main phase of North Himalayan nappes emplacement and is a shared structure in the North Himalayan nappe stack. Barrovian regional metamorphism is coeval to the extrusion of the Tso Morari Nappe and its incorporation into the North Himalayan nappe stack. It reaches amphibolite facies in most area of the Tso Nappe except the eastern part, close to the colder rocks of the Indus Suture Zone where it reaches only higher greenschist facies. This is due to a more rapid extrusion of this part of the nappe and is responsible","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"114 1","pages":"52-52"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87614815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-Himalayan tectonometamorphic signatures from the Kumaun Himalaya","authors":"M. Joshi","doi":"10.3126/HJS.V5I7.1273","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1273","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1273 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.75","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"31 1","pages":"75-75"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90240990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The petrogenesis of a crustal-derived Palaeoproterozoic Bomdila orthogneiss, Arunachal Pradesh, NE Lesser Himalaya","authors":"S. Rashid","doi":"10.3126/HJS.V5I7.1305","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1305","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1305 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.116","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"2 1","pages":"116-116"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88071463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Deep structure of Western Himalaya – Ladakh-Karakoram","authors":"S. S. Rai, V. Gaur, K. Priestley, L. Vinnik","doi":"10.3126/HJS.V5I7.1300","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1300","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1300 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.110","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"121 1","pages":"110-110"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88213526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraints to the timing of India-Eurasia collision determined from the Indus Group: a reassessment","authors":"Alexandra L. Henderson, Y. Najman, R. Parrish, A. Carter, M. BouDagher-Fadel, G. Foster, E. Garzanti, S. Andó","doi":"10.3126/HJS.V5I7.1266","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1266","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1266 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.64","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"12 1","pages":"64-64"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83512615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cretaceous - Tertiary carbonate platform evolution and the age of India – Asia collision along the Ladakh Himalaya (NW India)","authors":"O. Green, M. Searle, R. Corfield, R. Corfield","doi":"10.3126/HJS.V5I7.1256","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1256","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1256 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.54","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"20 1","pages":"54-54"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76451588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"How significant is erosion in extrusion- insights from analogue and analytical models","authors":"S. Mukherjee, H. Koyi, C. Talbot, A. Jain","doi":"10.3126/HJS.V5I7.1286","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1286","url":null,"abstract":"The absolute role of climate/erosion in extrusion of mountains has been debated for a long time. Field-studies, micro-structural observations and few analytical trials confirm that the extrusion of the Higher Himalayan Shear Zone, Sutlej section took place initially by simple shearing and was followed by combined simple shear and channel flow in a shifting mode (Mukherjee 2007). The extrusion mechanism of the HHSZ is studied with 10 analogue models of channel flow initiating from a horizontal channel and extrusion through a linked inclined channel. The inclined channel is the model HHSZ and is of parallel, gently diverging-up and strongly diverging-up geometries in different considerations. In these experiments, Polydimethylsiloxane (PDMS), a transparent Newtonian viscous polymer is used as the model material and geometric- and dynamic similarities are maintained with the prototype. Six flow zones are deciphered in the two channels in the mature stage of extrusion of the PDMS. Parabolic profiles are produced at the middle of both the inclined- and the horizontal channel during a Poiseuille and Jeffery Hamel flows. The part of the PDMS originally inside the horizontal channel starts moving through the inclined channel at a faster rate than the part of the PDMS initially residing in the inclined channel. This in effect gives rise to thrust movement of the former part of the PDMS. The thrust plane originates at the corner joining the inclined and the horizontal channel and rotates while coming closer to the free surface. The tectonic insights gained from these experiments are (i) secondary ductile thrusting took place in the HHSZ as a delayed response to its channel flow mode of extrusion, (ii) the genesis of the thrust seems to be related to the change in the direction of extrusive flow– from horizontal to inclined up; (iii) as these models were performed without any erosion of the extruded PDMS, erosion induced by climate did not trigger nor was a deciding factor in the genesis of the secondary thrust and concomitant extrusion of the HHSZ. However, erosion induced by a disparity in precipitation on the HHSZ might have augmented the extrusion process i.e. it had a passive role. In Sutlej section of the HHSZ, the simulated thrust can be correlated with the Chaura Thrust with the recorded activation at least 13 Ma after the ongoing extrusion of the HHSZ by channel flow mechanism around 18 Ma.","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"39 1","pages":"92"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79281262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ductile-brittle deformation in the hanging-wall of the South Tibetan Detachment System (Southern Tibet)","authors":"R. Carosi, C. Montomoli, E. Appel, I. Dunkl, L. Ding","doi":"10.3126/HJS.V5I7.1242","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1242","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1242 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.35","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"1 1","pages":"35-35"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91325169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectonics vs. erosion: evidences from apatite fission track and Rb-Sr (Biotite and Muscovite) thermochronology, Arunachal Himalaya","authors":"James Pebam, A. Jain, Rupendra Kumar, Sandeep Singh, N. Lal","doi":"10.3126/HJS.V5I7.1295","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1295","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1295 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.103-105","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"99 1","pages":"103-105"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80960084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lithostratigraphy of the Naga-Manipur Hills (Indo-Burma Range) Ophiolite Belt from Ukhrul District, Manipur, India","authors":"A. Joshi, K. Vidyadharan","doi":"10.3126/HJS.V5I7.1272","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1272","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1272 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.73-74","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"3 1","pages":"73-74"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88400982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}