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Triclinicity (obliquity and/or -value) has been well known as the mineralogical term indicating the ordering degree of K-feldspar, and defined as =12.5 (d13-1-d131) by Goldsmith and Laves (1954). Since then, it has been considered as a petrological indicator for the thermal history of granitic rocks. The factor controlling triclinicity in natural rocks is variable and different from case by case, but the most basic factors are the temperature of formation or the temperature of recrystallization and cooling rate of the rocks and /or the influence of hydrothermal fluids (Parsons and Brown, 1984). The aim of this study is to obtain information for the thermal history of granitic rocks in the Himalayas from the frequency and spatial distributions of triclinicity. More than 600 grains of K-feldspar collected from different types of augen gneisses and related granitic rocks in the Nepal Himalayas were X-rayed by powder method in this study.

Spatial and frequency distributions of triclinisity of K-feldspar in augen gneisses and related granitic rocks in the Nepal Himalayas