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

J. N. Malik ¹, A. K. Sahoo ¹, A. A. Shah ¹, A. Rawat ¹, A. Chaturvedi ¹

Affiliations
1 Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur - 208 016, IN

Abstract

We report in this note the farthest recorded liquefaction phenomenon near Jammu as sequel to the Mw 7.6,8 October, 2005 Muzaffarabad earthquake of Kashmir. The most common liquefaction features were sand blows and longitudinal en echelon fissures. Based on the occurrence of liquefaction and minor damage to the pakka houses it is suggested that the intensity would have been around VI-VII on MSK scale in this region.

Keywords

Liquefaction, Sand Blows, Muzaffarabad Earthquake, Jammu Area, Jammu and Kashmir.

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I. V. Sanislav ¹, A. A. Shah ¹

Affiliations
1 School of Earth and Environmental Sciences, James Cook University, Townsville, QLD 4811, AU

Abstract

Microstructural measurements of FIAs in staurolite reveal at least 3 periods of growth in the Proterozoic Colorado Front Range and 5 in the Paleozoic Western Maine. Dated monazite inclusions in staurolite have an absolute age of 1760±12 Ma (FIA 1), 1720±7 Ma (FIA 2), 1682±18 Ma (FIA 3) in Colorado, and 408±10 Ma (FIA 2), 388±8 Ma (FIA 3), 372±6 Ma (FIA 4), 352±4 Ma (FIA 5) in Maine, supporting the multiple periods of deformation and metamorphism indicated by the FIA succession in each region. Multiple phases of growth by similar reactions in the same as well as in diverse adjacent rocks in both regions suggest that PT and X are not the only factors controlling the commencement and cessation of metamorphic reactions. The FIAs preserved by the staurolite porphyroblasts indicate that the local partitioning of deformation at the scale of a porphyroblast was the eventual controlling factor on whether or not the staurolite forming reactions took place.

Keywords

FIAs, Staurolite, Monazite Dating, Metamorphism, Thermocalc.

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