Development of ground fissures: A case study from southern parts of Uttar Pradesh,India     

V. P. Gaur  S. K. Kar  Mridul Srivastava 《Journal of the Geological Society of India》2015,86(6):671-678

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Seismological evidence for a decoupled lithospheric segment in south Indian shield     

D. S. Rames  S. S. Rai  D. Srinagesh  V. K. Gaur 《Geophysical Journal International》1990,102(1):113-120

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High heat producing radioactive granites of malani igneous suite at northeast of Jodhpur,northwestern India     

K. L. Shrivastava  Deva Ram  Virendra Gaur 《Journal of the Geological Society of India》2017,89(3):291-294

The Malani igneous suite, a terrain showing crustal formation as late as in Neoproterozoic, shows some pink and grey granites in the northeast of the desert city of Jodhpur, in northwestern, India. The average heat generation value of 15.925 HGU for these granites that is much higher than the average known value (3.8 HGU) for the continental crust has been reported here. The concentration of uranium determined is four times higher than the average continental crust. Thorium is still higher than U and K. The radioelement concentration (Ur) varies from 15.58 to 73.48 in the granites with an average of 45.671, clearly indicates a ‘hot crust’. Hence it is favourable for the formation of mineralization of HFS elements like, Nb, Ce, REE and U and Th, which need to be explored in the terrain as an economic deposit.  相似文献   

Hydrological analysis of extreme rainfall events and severe rainstorms over Uttarakhand,India     

S. Nandargi  A. Gaur  S.S. Mulye 《水文科学杂志》2013,58(12):2145-2163

ABSTRACT

Following the June 2013 disaster in the Uttarakhand Himalayas, many discussions are ongoing with regard to how climate change is seeking revenge on mankind by endowing us with disasters! The event was mostly linked with the occurrence of an extreme event due to climate change. In view of this, an attempt has been made in this paper to analyse the extreme rainfall events experienced by the Uttarakhand during 1901–2013 using more than 100 stations’ daily rainfall data. The study revealed that during the 113-year period, the highest numbers of extreme events were recorded during the decade 1961–1970, and to some extent in the decade 1981–1990. Thereafter, there is a decrease in extreme rainfall events. The comparative study of extreme events prior to 1901 showed that on 17–18 September 1880, a rainstorm which occurred in close vicinity to Uttarakhand caused serious floods and damage to lives and properties. The extreme rainfall recorded by some stations during this unprecedented rainstorm has not been surpassed to date.  相似文献   

Foraminifera from jurassic sediments of Keera Dome, Kutch     

A. Talib  K. N. Gaur  A. K. Sisodia  Bilal A. Bhat  Roohi Irshad 《Journal of the Geological Society of India》2012,80(5):667-675

A foraminiferal assemblage comprising 30 species dominated by the family Vaginulinidae is recovered from the Chari Formation exposed at Keera Dome, Kutch. The paper presents a systematic account of eight species, reported for the first time form the Indian region. Preliminary interpretations regarding age and palaeoenvironment are drawn on the basis of the recovered foraminiferal assemblage. The assemblage supports a Callovian to Oxfordian age for the studied sequence. A near shore, open marine environment ranging from mid to outer shelf is interpreted on the basis of the foraminiferal assemblage.  相似文献   

GPS-derived deformation rates in northwestern Himalaya and Ladakh   总被引：1，自引：0，他引：1  

Sridevi Jade  H. J. Raghavendra Rao  M. S. M. Vijayan  V. K. Gaur  B. C. Bhatt  Kireet Kumar  Saigeetha Jaganathan  M. B. Ananda  P. Dileep Kumar 《International Journal of Earth Sciences》2011,100(6):1293-1301

Deformation rates derived from GPS measurements made at two continuously operating stations at Leh (34.1°N, 77.6°E) and Hanle (32.7°N, 78.9°E), and eight campaign sites in the trans-Himalayan Ladakh spanning 11 years (1997–2008), provide a clear picture of the kinematics of this region as well as the convergence rate across northwestern Himalaya. All the Ladakh sites move 32–34 mm/year NE in the ITRF2005 reference frame, and their relative velocities are 13–16 mm/year SW in the Indian reference frame and ~19 mm/year W with reference to the Lhasa IGS station in southeastern Tibet. The results indicate that there is no statistically significant deformation in the 200-km stretch between the continuous sites Leh and Hanle as well as between Leh and Nubra valley sites along the Karakoram fault, whereas the sites in and around the splayed Karakoram fault region indicate surface deformation of 2.5 mm/year. Campaign sites along the Karakoram fault zone indicate a fault parallel surface motion of 1.4–2.5 mm/year in the Tangste and western Panamik segment of the Karakoram fault, which quantifies the best possible GPS-derived dextral slip rate of 3 mm/year along this fault during this 11-year period. Baselines of Ladakh sites show convergence rates of 15–18 mm/year with respect to south India and 12–15 mm/year with respect to Delhi in north India and Almora in the Himalaya ~400 km north-northeast of Delhi. These constitute an arc normal convergence of 12–15 mm/year across the western Himalaya, which is consistent with arc normal convergence all along the Himalayan arc from west to east. Baseline extension rates of 14–16 mm/year between Lhasa and Ladakh sites are consistent with the east–west extension rate of Tibetan Plateau.  相似文献   

A debt of gratitude     

Vinod K. Gaur 《Journal of Earth System Science》1997,106(4):387-390

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Propagation of weak discontinuities in a vibrationally-excited gas flow     

Arisudan Rai  Madhukar Gaur 《Astrophysics and Space Science》1985,108(1):175-186

Propagation of weak discontinuities headed by wavefronts of arbitrary shape in three dimensions are studied in vibrationally relaxing gas flow. The transport equations representing the rate of change of discontinuities in the normal derivatives of the flow variables are obtained, and it is found that the nonlinearity in the governing equations does not contribute anything to the vibrationally relaxing gas. An explicit criterion for the growth and decay of weak discontinuities along bi-characteristic curves in the characteristic manifold of the governing differential equations is given. A special case of interest is also discussed.  相似文献   

Equilibrium constants of the molecular ion H 3 +     

V. P. Gaur  M. C. Pande  Suresh Chandra 《Astrophysics and Space Science》1992,189(1):147-149

Thd H ₃ ⁺ molecular ion plays an important role in the chemistry of astronomical objects as it protonates the neutral species. The authors have recently calculated the partition functions of H ₃ ⁺ which may be used to compute the equilibrium constants for the chemical reaction H₂+H₂ ⁺H ₃ ⁺ +H. In this short communication we have calculated the equilibrium constants for the temperature range from 500 to 8000 K. The results are also presented in the polynomial form.  相似文献   

Water Pollution – Phycological Perspectives     

J. P. Gaur  L. C. Rai 《洁净——土壤、空气、水》1983,11(4):375-389

Water pollution exerts a pressure of selection on algal populations. In spite of a possible adaptation, often a changed diversity and sociological structure result, from which other effects on higher levels of the nutrient chain may emanate. There are represented some biological indices for characterizing algal communities which may serve as a biological measure of pollution and selfpurification, the problem of diversity being especially taken into account. Moreover, algal tests are used for representing the trophic situation and for determining the limiting nutrient, but also for determining the toxic influencing of biocenosis by hydrocarbons, too. Special attention is paid to heavy metals with regard to their synergistic action and bioaccumulation. On the other hand, the mass culture of algae is a valuable method of wastewater treatment and the recovery of valuable materials, and algae ponds provide an important technique for advanced wastewater purification.  相似文献