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Summary and Conclusions (part-1)

The Okshitkon area covers about 72 square miles which is bounded by vertical grid 20 to 33 and horizontal grid 43 to 58 in one-inch map 84 M/9, in Kawlin Township.

Division. Mandalay-Myitkyina railroad passes through the eastern margin of the study area.

The present work comprises detailed geological mapping, petrological analysis and structural geology of the area; its correlation with those of the adjoining areas, the tectonic setting and economic importance of the minerals and rocks.

Seven rock units are recognized: (1) andesite, (2) rhyolite and its pyroclastic rocks, (3) diorite, (4) leucogranite, (5) dacite, (6) dyke and vein rocks, and (7) alluvium and recent gravels.

Andesite (so-called Mawgyi Andesite is well exposed in the northwestern part of the area. In some rocks the porphyritic texture is visible in hand specimens. Some of these contain vesicles filled with calcite and zeolite. They are regarded as Early Cretaceous in age (DGSE, 1976).

Rhyolite is commonly exposed in the central part of the area. It is characterized med joints, and in some places it is interbedded with rhyolitic tuff. Locally,vesicules are present. Some parts are considered to be sills. According to field evidence, the se rocks may be Early Cretaceous in age.

Diorite is observed in the southwestern corner of the study area. Good exposure is e Floats are scattered on the ground surface. Field evidences and radiometric dating assigned its age to be Late Cretaceous (DGSE, 1976).

Leucogranite is poorly exposed in the study area and occurs as highly weathered outcrops. They are highly altered. The gold-copper bearing quartz veins cut across this rock. Due to radiometric dating, hydrothermal alteration of this rock yields an age of Early Eocene (DGSE,1976). Therefore, it is possibly Late Cretaceous in age.

Dacite (so called Kawdaw Dacite) is found as irregular body forming sub conical hill. This rock is highly weathered and altered. Locally, it is associated with kaolinized tuff. Dacite emplaced contemporaneously with the deposition of Ketpanda sediments of Eocene age (Dear,1976).

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