3000 million years old Lalbagh rock facing human threat?

Morning walkers fear that it may be damaged by the use of heavy drilling machinery by personnel hired to rejuvenate the lake in the garden

The rock, termed Peninsular Gneiss, is a mixture of granitic rocks

The use of heavy drilling machinery by construction personnel hired to rejuvenate the lake in the renowned Lalbagh botanical gardens has several morning walkers and joggers worried. They fear that work would endanger the 3,000 million years old Peninsular Gneiss, the rock in the centre of the park. The personnel are cutting huge boulders using earth movers, near the Siddapura Gate. Dr Krishna, a morning visitor to the park, told Bangalore Mirror, “I saw these machines near the rock a few days ago. Vigilance officers informed them that they were drilling the earth to cut rocks. None of us had any clue where those rocks were transported.”

But horticulture officials clarified that the rock won’t be damaged. H M Krishnappa, deputy director of Lalbagh, said, “We are not drilling into the rock. 

Special white stone boulders have been brought from Pavagada to construct a bund along the recently rejuvenated Lalbagh lake. They are not only huge but irregular in shape as well. Hence, they have are being cut to fit our requirements. As there was no vast space available within the park to take up the drilling and chiseling work, we chose the empty space near Siddapur Gate, which was sometimes used as a parking lot.”  But when asked whether the drilling work with high level vibrations would damage the texture of the geologically significant rock, Krishnappa clarified, “They have just cleared the soil to keep the boulders intact while drilling and chiseling using heavy machines. We have been vigilant at every step.”

N Chandranna, a retired senior geologist from the mines and geology department, said, “The drilling would not harm the rock as the vibrations would be of negligible level. But using explosives would have a huge impact on the composition of the rock.”
history of the rock
The term Peninsular Gneiss means mixture of granitic rocks, which are largely spread around the southern plateu of India. The term was coined by Dr W F Smeeth of the Mysore Geological Department. It is considered to be one of the oldest rocks of earth. It was declared a national geological monument in 1916.
The antiquity of this rock has attracted geologists from all over the world and has given rise to erudite scientific papers on the evolution of earth by the pioneers of the Mysore Geological Depart-ment, Geological Survey of India and scholars. Stone quarry of this gneiss continues to be source material for research in the various branches of earth science.
source: http://www.BangaloreMirror.com / Bangalore> City / by Niranjan Kaggere / Friday, December 23rd, 2011

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