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S. P. Prizomwala S. B. Shukla Nilesh Bhatt 《Journal of the Geological Society of India》2012,79(6):557-562
Indus is one of the major sources of sediments to the Gulf of Kachchh. Yet only its <63 micron fraction is studied in detail
with regards to the offshore current dynamics. Hence here we present our study on characteristic signature of the Indus sediment
load (i.e. mica minerals) in >63 micron size fraction along the coast of Gulf of Kachchh. The spatial distribution of mica
minerals along the Gulf of Kachchh coast was studied which showed in general decreasing trend as we move along the northern
and southern coast of the Gulf of Kachchh but, an increase in amount near the southern mouth at Okha. The study shows that
the earlier proposed tidal barrier is ineffective in restricting movement of mica across the mouth of the gulf due to its
characteristic transport mechanism. Also the presence of mudflats along the gulf of Kachchh coast plays a vital role as sediment
receptors in the active sediment transport processes and mica minerals prove to be a promising simple tracer in studying the
Indus born sediments in the region. 相似文献
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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
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Animesh Mandal Arkoprovo Biswas Saurabh Mittal William K. Mohanty Shashi Prakash Sharma Debashish Sengupta Joydip Sen A. K. Bhatt 《Journal of the Geological Society of India》2013,82(6):601-606
Beldih mine at the central part of the South Purulia Shear Zone (SPSZ) has been reported with low grade uranium-bearing formation within quartz-magnetite-apatite host in kaolinized formation. Therefore, the present integrated geophysical study with gravity, magnetic, radiometric, very low frequency electromagnetic (VLF) and gradient resistivity profiling methods around the known mineralized zones aimed at identifying the exact geophysical signatures and lateral extent of these uranium mineralization bands. The closely spaced gravity-magnetic contours over the low to high anomaly transition zones of Bouguer, reduced-to-pole magnetic, and trend surface separated residual gravity-magnetic anomaly maps indicate the possibility of high altered zone(s) along NW-SE direction at the central part of the study area. High current density plots of VLF method and the low resistive zones in gradient resistivity study depict the coincidence with low gravity, moderately high magnetic and low resistivity anomalies at the same locations. Moderate high radioactive zones have also been observed over these locations. This also suggests the existence of radioactive mineralization over this region. Along profile P2, drilled borehole data revealed the presence of uranium mineralization at a depth of ~100 m. The vertical projection of this mineralization band also identified as low gravity, low resistivity and high magnetic anomaly zone. Thus, the application of integrated geophysical techniques supported by geological information successfully recognized the nature of geophysical signatures associated with the uranium mineralization of this region. This enhances the scope of further integrated geophysical investigations in the unexplored regions of SPSZ. 相似文献
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S. Panigrahy J. S. Parihar N. K. Patel V. K. Dadhwal T. T. Medhavy B. K. Ghose N. Ravi K. C. Pani B. K. Panigrahy V. N. Sridhar R. R. Mohanty S. K. Nanda D. P. Tripathy P. K. Mishra H. P. Bhatt S. R. Oza S. Sudhakar K. S. Sudha P. Kumar N. K. Das 《Journal of the Indian Society of Remote Sensing》1991,19(1):17-26
Rice is one of the most important foodgrains grown in India. Attempts have been made to estimate kharif rice acreage of Orissa state since 1986 using digital remote sensing data from Landsat MSS/TM and/or IRS-1A. Accuracies of the estimates obtained have been evaluated against BES (Bureau of Economics and Statistics) estimate. This paper describes the methodology adopted for rice acreage estimation of Orissa state, the results obtained for three years, i.e. 1986–87, 1988–89 and 1989–90, and their accuracy. 相似文献
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As part of a program to search for the near infrared counterparts to the far infrared sources discovered by the Infrared Astronomical Satellite (IRAS) we have scanned two areas including the IRAS error boxes for the sources IRAS 0453+444 and IRAS 1717-087 at 2.2 m down to the flux density limit of 1 Jy. Results on the IRAS sources and the detection of two new bright near infrared sources are reported and discussed. 相似文献