Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

B. K. Fotedar ¹, A. K. Raina ²

Affiliations
1 Post-Graduate Department of Geology, Jammu University, Jammu - 180004
2 Post-Graduate Department of Geology, Jammu University, Jammu - 180004, IN

Abstract

A gabbroic pluton of 4 sq km areal extension crops out at Warikwah, Baramulla District, Kashmir Himalaya. The three rock types in the pluton are recognized as norite, gabbro and quartz gabbro which are the products of differentiation under low PH₂O conditions in that order. The parental magma is considered to be of tholeiitic nature and is derived from a deep source as reflected by major and trace element variation. After the emplacement in an orogenic (collisional) tectonic setting, the pluton has undergone low-grade. amphibolite facies metamorphism.

Keywords

Gabbro, Petrochemistry, Warikwah, Baramulla District, Kashmir Himalaya, Jammu and Kashmir.

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S. K. Shah ¹, S. K. Parcha ², A. K. Raina ³

Affiliations
1 Post Graduate Department of Geology, University of Jammu, Jammu (Tawi), IN
2 Wadia Institute of Himalayan Geology, 33-General Mahadev Singh Road, Dehra Dun - 248001, IN
3 Western Coalfields Ltd., Coal Estate, Civil Lines, Nagpur 440001, IN

Abstract

A new agnostid genus Trilagnostus from Middle Cambrian of Kashmir is described in addition to Pagetia griesbachi and Pagetia sp. from the same level at the Solvan-Menevian boundary. Diplagnostus is also being reported and described in the same succession at the top of Menevian. This form helps in demarcating the Middle - Upper Cambrian boundary in the sequence.

Keywords

Trilobites, Middle Cambrian, Kashmir.

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M. M. S. Jamwal ¹, A. K. Raina ¹, B. L. Dhar ¹

Affiliations
1 PG Department of Geology, University of Jammu, Jammu-180 004, IN

Abstract

Piparan Granite batholith, in the southwest of Pir Panjal, Jammu Lesser Himalaya, is exposed within the Older Metamorphics (Precambrian). The granite is Ieuco- to mesocratic composed of quartz (32%), perthitic K-feldspar (27%), plagioclase An_13-28 (23%), micas(13%), garnet, apatite, zircon and ilmenite (8%). It is of two mica monzogranitic composition. Its major and trace element concentrations are comparable to the average crustal granite. The differentiation of the rock favours a normal trend with a positive correlation of alkalies and a negative trend of magnesium against silica. The granite is S-type (ilmenite series) and peraluminous, produced as a result of syntectonic crustal anatectic process at a temperature range of 650°-690°C, 3-5 kb PH₂O and at a depth of approximately 20-30 km.

Keywords

Petrology, Piparan Granite, Lesser Himalaya, Jammu and Kashmir.

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A. K. Raina ¹, A. K. Chakraborty ¹, C. Bandopadhay ¹

Affiliations
1 Central Mining Research Institute, Regional Centre, 3rd Floor, MECL Complex, Seminary Hills, Nagpur-440 006, IN

Abstract

No Abstract.

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A. K. Raina ¹, P. B. Choudhary ¹, M. Ramulu ¹, A. K. Chakraborty ¹, A. S. Dudhankar ¹, V. Udpikar ², N. Ghatpande ³, D. D. Misra ¹

Affiliations
1 Central Mining Research Institute, Regional Centre, 54-B, Shankar Nagar, Nagpur - 440 010, IN
2 Wavelett Group, Unit No. 1, Plot No. 59, Amchi Colony, Survey No.1, Bawdhan, Pune - 41 1 021, IN
3 Wavelett Group, Unit No. 1, Plot No. 59, Amchi Colony, Survey No.1, Bawdhan, Pune - 411 021, IN

Abstract

Grain size analysis is important in many fields such as sedimentology and mining. In blasting, quantifying size and distribution of fragmented rock poses a great problem to the blaster. Grain size and its distribution have a direct effect on the economy of the mining operation. The analysis may be easily done with sieve if sample is of small size. However, extensive sieving is not possible in either of the cases and particularly in blasting, where the amount of muck is quite large, With application of the digital image analytical techniques, the process has been simplified. Several such systems are in vogue throughout the world. Central Mining Research Institute (CMRI), Nagpur Centre in association with Wavelet Group of Pune, devised such a system (FRAGALYST V.l.0, 2.0) indigenously, to measure blast fragmentation. Major features of the system are discussed with its utility. Application of the same has been proved effectively in improving the efficiency of some mines in India. The system is 50 to 60 percent cheaper than imported ones. Future developments and application of the system to sedimentological calculations is also discussed. Few exercises conducted by the authors have shown that the results of sieve analysis and data provided by the FRAGALYST are comparable to reasonable degree of accuracy.

Keywords

Digital Image Analysis, Grain Size, FRAGALYST Software, Blast Fragmentation, Sedimentary Analysis.

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