Petrography and physico-mechanical properties of the granitic rocks from Kumrat valley, Kohistan Batholith, NW Pakistan

AshEse Journal of Physical Science

Vol. 1(1), pp. 001-008, April, 2015 

ISSN 2059-7827

© 2015 AshEse Visionary Limited 

 

Full Length Research

Muhammad Arif1, Ihtisham Islam2,3* and Muhammad Rizwan2

1Department of Geology, University of Peshawar, Peshawar, Pakistan

2National Centre of Excellence in Geology, University of Peshawar, Peshawar, Pakistan.

3Shaheed Benazir Bhutto University Sheringal, Dir Upper, Pakistan.

*Corresponding author. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Received March, 2015; Accepted April, 2015

 

The granitic rocks of the Kumrat area (upper Dir group of Kohistan Batholith) have been investigated in terms of their petrographic features and mechanical properties. Field observation and petrographic studies of representative samples reveal that the Kumrat granites are sub-equigranular to inequigranular, coarse to medium grained and without any preferred orientation. They essentially consist of plagioclase, quartz and alkali feldspar (exclusively orthoclase) with accessory amounts of biotite, muscovite, sericite, an opaque ore mineral and trace amounts of apatite. Chlorite observed in the studied samples is undoubtedly secondary mineral.The quartz grains are mostly strained and display strong undulose extinction. As a part of present study, some of the mechanical and physical properties including uniaxial compressive strength (UCS), uniaxial tensile strength (UTS), shear strength, specific gravity, porosity and water absorption of samples representing different textural varieties of Kumrat granites were also determined. The average UCS values for coarse and medium grained varieties are 49.15 and 58.50 respectively. On the basis of UCS values, the coarse grained and medium grained varieties fall in the category of moderately strong and strong rocks respectively. Correspondingly the values of their specific gravity, porosity and water absorption are within the range permissible for their use as construction material. A detailed investigation of petrographic features and mechanical properties reveals that the medium-grained granites are stronger than the coarse-grained ones, probably because of their relatively finer grain size. Elaboration of the relationship between physico-mechanical properties and petrographic characteristics is needed.

 

Key words:Granitic rocks, petrography, mechanical properties.

Read Full Article

Latest Journals

  • About A New Philosophy +

    AshEse Journal of Physical Science                                                                  Vol. 5(2), pp. 058-059, March, 2021 ISSN: 2059-7827   © 2021 AshEse Visionary Limited  http://www.ashese.co.uk/physical-science1/blog   Short Read More
  • Menstruation And The Dynamics of Cultural Violence +

    AshEse Journal of Family and Lifestyle                                                                  Vol. 5(1), pp. 044-050, February, 2021 ISSN: 2517-1720   © 2021 AshEse Visionary Limited    Full Read More
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49