THE FORMATION AND MORPHOLOGICAL CHARACTERISTICS OF ALLUVIAL FAN DEPOSITS IN THE RANGPO BASIN SIKKIM.

Abstract

The present paper focuses on some observations and distinct findings about the formation and
morphological characteristics of alluvial fans deposit in the Rangpo basin. Three alluvial fans
have been taken under the study. It is an ample scope for studying the evolution and
developmental strategies of alluvial fans being originated by both endogenetic and exogenetic
forces. The geometry of fans are mainly controlled by the relating factors like relief, climate,
lithology and the hydrographic characteristics of the streams. Fan development is a result of
complex interaction of climate and tectonism being influenced by open hydrological system.
It is observed from the study that the surface slope of the three coalesced fans being very
steep has been carved out into agricultural terraces which are cultivated on a regular basis.