Journal of Himalayan Earth Sciences最新文献

{"title":"Lake-level changes in the past 50 ka reconstructed from the lacustrine delta deposits in Kathmandu Valley, Nepal","authors":"T. Sakai, A. Gajurel, H. Tabata, Nobuo Ooi, B. Upreti","doi":"10.3126/HJS.V5I7.1314","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1314","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1314 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.129","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"1 1","pages":"129-129"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82026806","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":"Geochemical-isotopic characteristics and K-Ar ages of magmatic rocks from Hundar valley, Shyok Suture Zone, Ladakh","authors":"T. Ahmad, S. Sivaprabha, S. Balakrishnan, N. X. Thanh, T. Itaya, H. Sachan, D. Mukhopadhyay, P. Khanna","doi":"10.3126/HJS.V5I7.1229","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1229","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 18 Hundar section rocks of the Shyok Suture Zone comprise predominantly diorite, granodiorite with minor gabbro-dolerite, two types of granite, volcano-clastic sediments and tuffs that are intruded by diabasic dykes. Diorite samples contain pyroxene, amphiboles and plagioclase as major phases. Quartz and alkali feldspar, showing myrmekitic intergrowth are found in granites. Gabbro-dolerite comprises feldspar, biotite, hypersthene and hornblendes. Andesitic dykes have euhedral plagioclase phenocryst within fine-grained groundmass. Major and trace element display trends expected for igneous rocks from mafic to felsic compositions. Data indicate fractionation of olivine, pyroxene, feldspars and Fe-Ti oxide phases during evolution of the magma. Normalized REE plots depict light REE enrichment and middle heavy REE moderate fractionation. Multielement patterns also display enrichment of large ion lithophile elements (LILE) and depletion of high field strength elements (HFSE) with significant negative Sr and Eu anomalies. Hundar samples do not define any collinear array for Rb-Sr or Sm-Nd isotope evolution indicating multiplicity of sources for magmas. Nd (t = 100) varies from +3.7 to -7.4, while the Sr varies from -7 to +50. Nd vs. Sr diagram plots for Hunder samples partly overlaps the mantle array and partly that of Ladakh pluton. The samples of Ladakh pluton have extended Nd and Sr values up to -8 and +165 respectively. Probably magmas of the Hundar section were variably contaminated by enriched and long lived continental crustal components. Eight samples from the Hundar section yield K-Ar ages from 60.8 Ma to 65.8 Ma. The medium-grained granite shows younger age (60.8 and 61.8 Ma) compared to the coarser-grained granite of 63.9 Ma. Three coarse-grained diorite samples yield the age from 64.4 to 65.8 Ma. Two microdiorite samples in the center of Hundar section yield the age of 64.0 and 64.4 Ma. The coarse grained granite samples having magma mingling structure with the microdiorite gives the similar ages of 63.9 and 64.4 Ma respectively. Two coarse grained diorite display the oldest age (65.8 Ma) in the area. These age data indicate that the magmatic rocks of the Hundar section are much older than the dominant magmatic phase (~58 Ma) of the Ladakh batholith and therefore could be unrelated. Geochemical-isotopic characteristics and K-Ar ages of magmatic rocks from Hundar valley, Shyok Suture Zone, Ladakh","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"82 1","pages":"18"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84979862","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":"Geochemistry of Late Quaternary Spituk palaeolake deposite of Ladakh, NW Himalaya","authors":"B. Phartiyal, Anupam Sharma","doi":"10.3126/HJS.V5I7.1322","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1322","url":null,"abstract":"","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"5 1","pages":"141"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89280728","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":"P-T evolution across the Main Central Thrust zone (Eastern Nepal): hidden discontinuities revealed by petrology","authors":"C. Groppo, F. Rolfo, B. Lombardo","doi":"10.3126/HJS.V5I7.1257","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1257","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1257 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.55","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"9 1","pages":"55-55"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84314476","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":"Impact of coeval tectonic and sedimentary-driven tectonics on the development of overpressure cells, on the sealing, and fluid migration –Petroleum potential and environmental risks of the Makran Accretionary Prism in Pakistan","authors":"N. Ellouz‐Zimmermann, A. Battani, E. Deville, A. Prinzohfer, J. Ferrand","doi":"10.3126/HJS.V5I7.1253","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1253","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1253 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.50-51.","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"22 1","pages":"50-51"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3126/HJS.V5I7.1253","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72510680","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":"Evolution of the Lesser Himalaya","authors":"O. Bhargava, W. Frank","doi":"10.3126/hjs.v5i7.1235","DOIUrl":"https://doi.org/10.3126/hjs.v5i7.1235","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1235 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.26-27","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"44 1","pages":"26-27"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73929894","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":"Stress field evolution in the North West Himalayan syntaxis (Northern Pakistan)","authors":"A. Pêcher, S. Guillot, F. Jouanne, G. Mahéo, J. Mugnier, Y. Rollard, P. Beek, J. V. Melle","doi":"10.3126/HJS.V5I7.1296","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1296","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1296 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.106","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"49 1","pages":"106-106"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85586500","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":"New occurrence of eclogitic continental rocks in NW Himalaya: The Stak massif in northern Pakistan","authors":"S. Guillot, N. Riel, K. Hattori, S. Desgreniers, Y. Rolland, J. V. Melle, M. Latif, A. Kausar, A. Pêcher","doi":"10.3126/HJS.V5I7.1259","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1259","url":null,"abstract":"Three occurrences of ultrahigh pressure (UHP) rocks have been recognized along the Himalayan belt. In southern Tibet, Yang et al. (2007) documented diamond- and coesitebearing chromitites from the Lobuosa ophiolite in the Indus-Tsangpo Suture zone (ITSZ). Coesite-bearing eclogites are reported in the Tso Morari and Kaghan massifs in NW Himalaya (O’Brien et al. 2001, Mukherjee et al. 2003 2005) in the ITSZ of the Main Mantle Thrust (MMT). The latter occurrences are the products of the subduction of the margin of the Indian continent between 57 and 44 Ma (Leech et al. 2005, Parrish et al. 2006, Guillot et al. 2008). We report a new occurrence of eclogitic rocks from the Stak area where pyroxenite boudins with a retrogressed eclogitic assemblage were described by Le Fort et al. in 1997. This massif east of the Nanga Parbat-Haramosh anticline consists of garnet-bearing orthogneisses, metasediments, and marbles intruded by dykes of boudinaged garnet-bearing metabasites. The metabasites have similar chemical composition as the basalts of the Panjal Traps and this association of the metabasites with metasediments suggest that the rocks represent the western margin of the Indian continent, similar to the UHP massifs at Kaghan (Chaudhry and Ghazanfar 1987) and Tso Morari (Guillot et al. 1997). The rocks in the Stak area have undergone at least two phases of folding. The youngest event is defined by NE oriented steep folds (up to 100m in size) with axial plane dipping ~ 60° towards the NW. Asymmetrical folds indicate the top verging to the SE, which is likely related to the exhumation of the Nanga Parbat-Haramosh block (Argles and Edwards 2002). The deformation of the MMT also affected the area, which resulted in alternating layers of weakly metamorphosed rocks of the Ladakh arc and strongly metamorphosed Indian continental rocks. The Stak massif contains well preserved eclogitic assemblage; garnet (Pyr34), omphacite (Jd46), phengite, Ca carbonate (most likely aragonite). The presence of coesite is suspected because the peak metamorphic condition is in the stability field of coesite, greater than 2.7 GPa, based on the bulk and garnet compositions. Rims of garnet contain inclusions of phengite and dolomite, clinopyroxene (Jd24) and plagioclase (Ab80). Omphacite in the matrix is altered to a symplectic mixture of Na-Ca clinopyroxene (Jd18) and albite, indicating that the retrogression under eclogitic conditions at ~1.8±0.1 GPa and 650-700°C. The late folding developed under amphibolitic facies conditions as marked by pargasitic amphibole, biotite and ilmenite and later the crystallization of hornblende. The assemblages indicate that the folding took place during a pressure decrease from 11 to 8 kbar and a temperature decrease from 700 to 600°C. Finally late localized millimetric shear bands defined by calcite and chlorite developed at the ductile-brittle transition under greenschist facies conditions. A few Ar-Ar biotite ages have been obtained in this study","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"38 1","pages":"57-57"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77339128","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":"Paleomagnetic and Geochronologic Results From Late Paleozoic and Mesozoic Rocks of the Central Tibet: Implications for the Paleogeography of the Qiangtang Terrane","authors":"Xixi Zhao, P. Lippert, R. Coe, Chengshan Wang, Zhifei Liu, H. Yi, Yalin Li, B. Deng, I. Villa","doi":"10.3126/HJS.V5I7.1349","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1349","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1349 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.177","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"30 1","pages":"177-177"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90215995","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":"Neogene sedimentary evolution of the Guide Basin and its implications on uplift of the NE Tibetan Plateau, China","authors":"Chunhui Song, Q. Meng, X. Fang, S. Dai, Junping Gao","doi":"10.3126/HJS.V5I7.1333","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1333","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1333 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.154","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"34 1","pages":"154-154"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85734407","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}