Journal of Himalayan Earth Sciences最新文献

{"title":"possible Permian suture in the Lhasa Block, Tibet: Evidence from eclogites and probable ophiolite","authors":"Chen Songyong, Y. Jingsui, Li Tianfu, Xu Xiangzhen, Liu Zhaoli, Ren Yufeng","doi":"10.3126/HJS.V5I7.1334","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1334","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1334 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.155","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"52 1","pages":"155-155"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77268514","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":"Seismic Tomography of Garwhal-Kumaun Himalayas: Is the basal detachment a wistful thinking?","authors":"S. Mukhopadhyay, J. Sharma, B. Arora","doi":"10.3126/HJS.V5I7.1313","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1313","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 128 We carried out seismic tomography in the Garhwal-Kumaun Himalayas using Pand S-phase data of local earthquakes. We observe that the near surface low velocity zones generally coincide with sedimentary formations, such as, inner and outer sedimentary formations and Berinag formations. The metamorphic rocks like Vaikrita, Almora and Ramgarh Groups show up as bodies having higher velocity. Many workers have suggested the presence of a gentle northerly dipping detachment that decouples Lower Himalaya sedimentary formations from underlying metamorphic crystalline basement. This suggestion is based in part on seismicity pattern. The present seismic tomographic work does not show Seismic Tomography of Garwhal-Kumaun Himalayas: Is the basal detachment a wistful thinking?","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"2 1","pages":"128"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89867273","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":"Paired terraces of the Seuti Khola, Dharan, eastern Nepal","authors":"M. P. Koirala, S. Dwivedi, P. Dhakal, G. Neupane, Yadav Prasad Dhakal, S. Khanal, N. Regmi, G. Ojha, S. Shrestha, R. Dahal","doi":"10.3126/HJS.V5I7.1276","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1276","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1276 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.80","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"21 7 1","pages":"80-80"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82714536","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":"Examination of relocated earthquake hypocenters in the Pamir- Hindu Kush seismic zone using 3-D plots","authors":"Shamita Das","doi":"10.3126/HJS.V5I7.1248","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1248","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 43 Reliably relocated earthquake hypocenters in the Pamir-Hindu Kush region for about 1700 earthquakes deeper than 50 km, are examined using 3-D color plots. The hypocenters define an single contorted “S” shaped seismic zone, 700 km long and no more than 30 km wide and with most activity concentrated in the 100300 km depth range. The main features observed are: a) the continuous steepening of the north dipping Hindu Kush seismic zone as we move eastwards towards the Pamirs; b) the southeast dipping Pamir seismic zone; c) the curvature and forking of the subducting slab at depths greater than 200 km within the eastern part of the Hindu Kush seismic zone; d) the very abrupt cutoff in intermediate depth seismicity at 90-110 km depth with no extension to shallower depths, under the Pamirs, suggesting that the slab has Examination of relocated earthquake hypocenters in the PamirHindu Kush seismic zone using 3-D plots","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"1 1","pages":"43"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83020574","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":"Mineralogy and Geochemistry of mafic to hybrid microgranular enclaves and felsic host of Ladakh batholith, Northwest Himalaya: Evidence of multistage complex magmatic processes","authors":"Santosh Kumar, Brajesh Singh","doi":"10.3126/HJS.V5I7.1315","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1315","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 130 Felsic magmatisms in the north of Indus-Tsangpo-Suture Zone, referred herein Ladakh granitoids (LG), have been characterized dominantly as calc-alkaline, magnetite to ilmenite series (gradually changing from NW to SE) granitoids derived from partial melting of heterogenous protoliths in subduction environment. Field relation, petrography, mineralogy and geochemistry of ME and felsic host LG have been carried out along various transects covering Northwest (Dras-KargilSilmo-Batalik-Achina Thang), Central (Leh-Ganglas-S. PulluKhardungLa-N. Pullu-Khardung), Southeast (Himiya-LitseUpshi-Karu-Sakti-Zingral-ChangLa) parts of Ladakh batholith in order to understand the physical and chemical processes of mafic and felsic magma interaction in plutonic condition. The LG can be broadly classified into coarse-grained LG with abundant mafics (hbl-bt), medium-grained LG with low content of mafics, and fine-grained leucocratic LG with very low amount of mafics. Mesocratic to melanocratic, fine to medium grained and porphyritic (xenocrystic) hybrid microgranular enclaves (ME) are found hosted mostly in medium to coarsegrained LG. Double enclaves (one mafic ME into other porphyritic ME) and syn-plutonic disrupted mafic dykes are also hosted in K-feldspar megacrysts bearing LG in the Northwest part of batholith, which record evidence of multiple mafic to hybrid magma injection and thermal rejuvenation of partly crystalline LG. ME are absent or rare in the leucocratic variety of LG. The ME are rounded to elongate commonly having sharp, crenulate, and occasionally diffuse contacts with felsic host, and size varies from a few cm to metres across but cm-sized ME (d<30 cm) are common, which strongly suggest that several pulses of crystal-charged mafic and felsic magmas, coexisted, hybridized, co-mingled into plutonic setting. Most hybridized parts (active mixing region) of LG do not contain ME whereas isolated mixing regions of LG contain variable sizes of mingled and streched (sine flowage) ME. The ME (diorite, quartzdiorite) and felsic host LG (granodiorite, monzogranite) bear common mineral asemblages (hbl-bt-pl-kfs-qtz-ap-zrnmt ±ilm) but differ in their mineral proportions. The ME lack cumulate-like texture and are fine to medium grained, and therefore oppose their co-genetic link with LG. Presence of patchy zoned (spongy, cellular) plagioclase xenocrysts, quartz ocelli and apatite needles in porphyritic ME strongly indicate mingling and undercooling of hybridized ME globules into cooler felsic host LG. Grain size differences, crystal index, and size of ME among the ME population, except to those of porphyritic ones, correlate well with degree of undercooling of ME. Disaggregated large ME into several smaller ones Mineralogy and Geochemistry of mafic to hybrid microgranular enclaves and felsic host of Ladakh batholith, Northwest Himalaya: Evidence of multistage complex magmatic processes","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"108 1","pages":"130-131"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81640206","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 Central Crystallines Around Hapoli, Subansiri, Eastern Himalayas","authors":"A. Yin, C. Dubey, Aag Webba, P. Verma, T. Kelty, T. Harrison","doi":"10.3126/HJS.V5I7.1347","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1347","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1347 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.174-5","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"AES-20 1","pages":"174-175"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84582078","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":"Significance of the clay mineral distribution in the fluvial sediments of the Neogene Himalayan Foreland Basin (central Nepal)","authors":"P. Huyghe, R. Guilbaud, M. Bernet, A. Gajurel","doi":"10.3126/HJS.V5I7.1293","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1293","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1293 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.100","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"23 1","pages":"100-100"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87301433","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":"High Crustal Seismic Attenuation in Ladakh- Karakoram","authors":"S. S. Rai, A. Ashish, A. Padhi, P. Sarma","doi":"10.3126/HJS.V5I7.1299","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1299","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1299 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.109","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"41 5 1","pages":"109-109"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81233792","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":"Songpan Garze fold belt: New petrological and geochronological data","authors":"A. Billerot, J. Sigoyer, S. Duchêne, O. Vanderhaeghe, M. Pubellier","doi":"10.3126/HJS.V5I7.1239","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1239","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1239 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.32","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"28 1","pages":"32-32"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81487352","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":"Diagenetic and metamorphic overprint and deformation history of Permo-Triassic Tethyan sediments, SE Tibet","authors":"I. Dunkl, D. Lin, C. Montomoli, K. Wemmer, G. Rantitsch, B. Antolín, R. E. Bay, E. Appel","doi":"10.3126/HJS.V5I7.1252","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1252","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1252 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"35 1","pages":"49-49"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80561763","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}