Journal of Himalayan Earth Sciences最新文献

{"title":"The Main Central Thrust Revisited: New Insights from Sikkim Himalaya","authors":"S. Neogi, V. Ravikant","doi":"10.3126/HJS.V5I7.1289","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1289","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 95 One of the most coherent crustal sections in the entire Himalaya, from the point of view of lack of disruption or repetitions of key beds due to thrusting, is exposed in Sikkim. Structural studies across this unique section in Sikkim, covering the so-called Lesser Himalaya, the Higher Himalaya and the intervening Main Central The Main Central Thrust Revisited: New Insights from Sikkim Himalaya","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"56 1","pages":"95-96"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86886445","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":"Addressing Tectonic and Metamorphic Controversy in the Pakistan Himalaya","authors":"J. DiPietro","doi":"10.3126/HJS.V5I7.1250","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1250","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1250 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.45-46","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"1 1","pages":"45-46"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90120692","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":"Kyanite-bearing anatectic metapelites from the Eastern Himalayan Syntaxis, Eastern Tibet, China : textural evidence for partial melting and phase equilibria modeling","authors":"C. Guilmette, Indares Aphrodite, Hébert Réjean, Chengshan Wang","doi":"10.3126/HJS.V5I7.1258","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1258","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1258 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.56","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"1 1","pages":"56-56"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76977327","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":"Comparison of regional geoelectric structure of Himalayan region","authors":"T. Harinarayana, R. Sastry","doi":"10.3126/HJS.V5I7.1263","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1263","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1263 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.61","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"25 2","pages":"61-61"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72578748","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":"Discovery of granulitized eclogite in North Sikkim expands the Eastern Himalaya high-pressure province","authors":"F. Rolfo, R. Carosi, C. Montomoli, D. Visonà","doi":"10.3126/HJS.V5I7.1312","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1312","url":null,"abstract":"Eclogite occurrences are very few in the Himalayas and mainly consist of two types (Lombardo and Rolfo 2000): the coesite-bearing eclogites of the western Himalaya (Kaghan valley: O’Brien et al. 2001; Tso Morari: Sachan et al. 2004) and the granulitized eclogites of the eastern Himalaya (Ama Drime range: Lombardo et al. 1998). Unlike the “western type” eclogites, where post-peak decompression under constant to decreasing temperature suggests exhumation favoured by thrusting associated with accretion of the metamorphic pile onto the base of the over-riding plate, the “eastern type” Ama Drime eclogites were probably exhumed relatively slowly and were subjected to thermal relaxation in the thickened continental crust producing a strong granulite-facies overprint at intermediate crustal levels.A new finding of granulitized eclogites in North Sikkim, east of Mount Kangchendzonga and some 120 km southeast of the Ama Drime, extends the eclogite province in eastern Himalaya.Mount Kangchendzonga sits at the western flank of the Ranjit Tectonic Window (RTW), a regional structure cutting deeply through the Himalayan nappe pile. At low structural levels, the RTW exposes low grade Lesser Himalayan schists overlying unmetamorphosed Permo-Carboniferous sedimentary rocks of Gondwanian affinity. At higher structural levels, the northern end of the RTW shows an increase in metamorphic grade through the Main Central Thrust zone up to migmatites with garnet-bearing leucosomes in the Higher Himalayan Crystallines (HHC). In north Sikkim, along the Zemu Glacier east of Kangchendzonga, HHC main lithologies are granite to granodiorite orthogneiss with intercalations of biotite-rich paragneiss and very rare metabasites. Rolfo et al. (2006) gave a preliminary description of this geologic transect, where the main fabric is folded by two systems of later folds trending NNE-SSW and WNW-ESE with steeply dipping axial planes. The RTW can be the result of the interference pattern between these two later system of folds. Compressive and extensional shear zones with a top both to the SW and SE sense of shear respectively affect the main foliation. Top to the SE shear zones can be correlated with normal shear zones recognized in the nearmost western Bhutan (Carosi et al. 2006), developed during the extrusion of the HHC.The lithological associations of the HHC in the Zemu Glacier area are comparable to those described south of Mt. Kangchendzonga by Vezzoli et al. (2005). Among metabasites collected in the drainage of Zemu Glacier, a few samples are very similar to the granulitized eclogites first described in eastern","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"18 1","pages":"126-127"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72902698","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":"Polyphase deformation history of the “Tibetan Sedimentary Sequence” in the Himalayan chain (South-East Tibet)","authors":"C. Montomoli, E. Appel, A. Borja, I. Dunkl, R. E. Bay, L. Ding, R. Gloaguen","doi":"10.3126/HJS.V5I7.1285","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1285","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1285 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.91","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"67 1","pages":"91-91"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81197282","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":"Geomorphic indicators of active growth and lateral propagation of fault-related folds: Mohand Ridge anticline, NW Himalaya","authors":"T. Singh, A. Awasthi","doi":"10.3126/HJS.V5I7.1328","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1328","url":null,"abstract":"The Himalayan orogen is a result of collision of Indian and Eurasian plates. The collision and continued convergence has resulted in development of three south verging crustal-scale thrust faults all along the E-W trending orogen dividing into three litho-tectonic units viz. Higher Himalaya, Lesser Himalaya and Sub-Himalaya from north to south in that order. The SubHimalayan zone is characterized by the presence of fault-related folds that are conspicuously marked by the linear ridges running parallel to the orogen. These fault-related folds are segmented by a number of transverse strike-slip faults. The present study investigates the geomorphology of the Mohand Ridge anticline, bound between the two strike slip faults i.e. Yamuna fault towards the west and Ganga fault towards the east. The geomorphic features related to the interaction of pre-existing through-going drainage, tributary pattern on the ridge and topographic profiles suggest that the Mohand Ridge anticline is growing towards west. Further this information is also supported by morphometric data of watersheds developed on the ridge. A progressive decrease in drainage density (Dd) of watersheds from east to west has been observed in addition to an increase in hypsometric integral (HI) values in that direction. Both these parameters (Dd and HI) have been demonstrated to evolve with time in response to neotectonic activity. Hence based on the geomorphic observations and lateral variation in morphometric data it is inferred that the Mohand Ridge anticline has evolved through by vertical growth and lateral propagation from east towards west.","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"PP 1","pages":"147-147"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84770190","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 and Petrogenesis of Granitoids from Kameng Corridor of Arunachal Himalaya, Northeast India","authors":"Santosh Kumar, M. Pathak","doi":"10.3126/HJS.V5I7.1316","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1316","url":null,"abstract":"HIMALAYAN JOURNAL OF SCIENCES | VOL. 5 | ISSUE 7 (SPECIAL ISSUE) | 2008 132 Felsic magmatisms in Kameng Corridor of Arunachal Himalaya are mainly represented by extensively exposed Palaeoproterozoic granite gneiss (GGn), small stock-like undeformed Mesoproterozoic biotite granite (BG) and veins and pods of Tertiary leucogranite (TLg). The magnetic susceptibility (MS) measurements and whole rock geochemistry of these felsic magmatic bodies have been carried out in order to evaluate nature of granite series and petrogenesis of these felsic rocks with its implication on collisional tectonics. The GGn records average MS of 0.243×10-3 SI at Bomdila proper corresponding to ilmenite series (reduced type) granites, which further reduced (χ=0.076×10-3 SI) in close contact with black shales of Salari Group. The BG measures MS values between 0.156 and 0.120×10-3 SI slightly changing from core to margin of the stock suggesting marginal reduction of BG melt at emplacement level. The TLg bears MS values (χ=0.042 to 2.82×10-3 SI) and at places intrudes the hornblende-biotite granite (χ=15.42-27.37×10-3 SI) an older lithounit of Sela Group exposed beyond the Main Crystalline Thrust (MCT). Observed MS variations of these felsic magma bodies appear primarily intrinsic to crustal (metasedimentary) source regions, although these melts have been partly reduced at emplacement level as a result of reaction with carbonaceous country rocks. The modal composition of GGn represents largely monzogranite (ss) whereas BG corresponds to granodiorite, which are related to pre-Himalayan syncollisional and pre-plate collisional tectonics respectively. However, the TLg is ms-bt±tur leucogranite corresponding to peraluminous syncollisional (Himalayan) anatectic melt. Muscovite of GGn represents solidsolution of celadonitic and paragonitic end-members of primary muscovite composition. Empirically estimated Li-content of GGn muscovite relates to Li-mica zinnwaldite. Biotite in GGn is mostly transitional between Feand Mg-biotites evolved from FMQ to NNO buffers syn-crystallizing with muscovite, and exhibits dominant Mg Fe and less pronounced 2Al 3Fe2+ substitutions typical to its evolution in a peraluminous (S-type) felsic melt. Biotite in BG is, however, ferribiotite evolved from FMQ to NNO buffers and exhibits pronounced Mg Fe and less pronounced 3Mg 2Al substitutions typical to its crystallization in a calc-alkaline, metaluminous (I-type) felsic melt. GGn biotite is markedly enriched in siderophyllite and depleted in phlogopite components as compared to BG biotite. Tourmaline from GGn belongs to schorl (Fe)-dravite (Mg)-elbaite (Li+Al) end-members solid-solution typically crystallized in a Li-poor felsic melt. Whole rock composition of GGn (molar A/CNK= 1.19-1.45) and TLg (molar A/CNK=1.29-1.33) represents typical to peraluminous (S-type) granites whereas BG (molar A/ CNK=0.95-0.97) is metaluminous (I-type) in character, strongly suggesting involvement of heterogeneous protoliths i","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"16 1","pages":"132"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87060545","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":"Kinematics of the crust in southern Tibet and Higher Himalayan Crystalline –a paleomagnetic approach","authors":"Tachida El Bay, E. Appel, R. Carosi, L. Ding, D. Istvàn, R. Gloaguen, C. Montomoli, L. Paudel, B. Wauschkuhn","doi":"10.3126/HJS.V5I7.1233","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1233","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1233 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.22-23","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"25 1","pages":"22-23"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74697299","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":"Different eclogite types from the Pakistan Himalaya and implications for exhumation processes","authors":"F. Wilke, P. O'Brien, M. A. Khan","doi":"10.3126/HJS.V5I7.1345","DOIUrl":"https://doi.org/10.3126/HJS.V5I7.1345","url":null,"abstract":"DOI = 10.3126/hjs.v5i7.1345 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.170-1","PeriodicalId":42873,"journal":{"name":"Journal of Himalayan Earth Sciences","volume":"57 1","pages":"170-171"},"PeriodicalIF":0.4,"publicationDate":"2008-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80490203","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}