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a. Tertiary rocks in Siwalik
Hypabyssal basic magmatic
sills and dykes in Middle and Lower Siwalik, Central Nepal
Dolerite in Marine Khola
section, small basic rock bodies (Basaltic) along Dwar khola section
b. Precambrian
Felsic Rocks:
-In Higher Himalaya, MCT zone and the Lesser
Himalayan Crystalline thrust sheets
-Synsedimentary
feldspathic augen gneiss
L to M Paleozoic age of
Ulleri Augen gneiss
Ulleri gneiss in the MCT zone is the most thickest band in the Himalaya
(about 1500 m thick) and extends to entire length of the Himalaya, often
associated with granites and pegmatites.
Aulis Volcanics at Tansen
area palpa.
Composition: between tholeiitic and alkalic basalt compositions
As supracrustal dikes and sills, intruded in
Precambrian Nawakot Complex
deformed and
metamorphosed together with the Nawakot Complex
They occur as greenschist in low-grade rocks
and amphibolite in high-grade rocks
e. Precambrian
alkaline rocks:
Nepheline syenite and
alkaline gneiss @ Ampipal, Gorkha (Precambrian)
Occurrence: 2 by 7.5 km wide, in Kunchha Fm, generally exhibits the same
schistosity and lineation as the country rock, often cross-cut by basic and
ultrabasic alkaline dykes.
f.
Granites:
Granites are distributed in three parallel belts in Nepal Himalaya. See detail about Granites of Nepal Himalaya
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