DBPapers
DOI: 10.5593/SGEM2015/B11/S4.076

ESTIMATION OF THE EFFECT OF WEATHERING ON THE PHYSICO-MECHANICAL PROPERTIES AND DEGREE OF QUARTZ PRESERVATION IN INDUSTRIAL SPOIL HEAPS OF PEGMATITE

Skamnitskaya L.S., Bubnova T.P.
Wednesday 5 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 599-606 pp

ABSTRACT
A complex, integrated weathering process is understood to fall tentatively into physical, mechanical and chemical weathering.
The mechanical disintegration of rocks and minerals, i. e. a decrease in size without changes in chemical composition, is induced by variations in temperature upon heating of rocks by sun rays (thermal weathering) or by the mechanical effect of water which freezes in the fractures and pores of rocks and minerals (frost weathering). Quartz, whose structure is considered to consist exclusively of silicon-oxygen tetrahedra, is most resistant to thermal and frost weathering under natural conditions.
The mineralogical and petrographic study of milky quartz from differentiated mica pegmatite has shown that it has a granoblastic, disequilibrium structure. Mosaic structures are displayed. Most quartz grains are always deformed. Grain boundaries are commonly irregular, undulating, serrate or step-like.
The effect of physical weathering was estimated by studying the microhardness of quartz in polished samples produced from the least fractured lumps selected from spoil heaps of mica pegmatite.
The experimental study of mechanical weathering using a method for estimation of the frost resistance of milky quartz has shown that the particle-size characteristics of coarse and fine quartz fractions change most considerably.
The study has shown that the effect of physical weathering on milky quartz from spoil heaps of mica pegmatite is indicated by changes in strength and particle-size characteristics, which is associated with textural and structural characteristics (the presence of two quartz grain generations and the degree of their deformation) that intensify the access of weathering factors.

Keywords: weathering, quartz, physico-mechanical properties, mineralogical and petrographic studies, artificial mineral deposits

PAPER 10.5593/SGEM2015/B11/S4.076 : ESTIMATION OF THE EFFECT OF WEATHERING ON THE PHYSICO-MECHANICAL PROPERTIES AND DEGREE OF QUARTZ PRESERVATION IN INDUSTRIAL SPOIL HEAPS OF PEGMATITE

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