Sedimentological Character of Fan Delta: Modern Sediment Case Study in Muara Pingai Area, Singkarak Lake, West Sumatra Indonesia

Abstract

Muara Pingai is a village in Junjuang Siriah sub-district, Solok regency, West Sumatera. It is located on the edge of the western Singkarak Lake and on borders of Bukit Barisan. Morphology of Muara Pingai area is formed by sedimentological process from Bukit Barisan to Southern part of Singkarak Lake. Based on morphological fact and collected sedimentological data by outcrop observation, PVC cores and modern sediment analysis; this area has been formed by Fan Delta process which sediment has been transported by Pingai River as an inlet system to Singkarak Lake. Fan Delta of Muara Pingai is divided into three parts, classified by its position in Fan Delta system which is: Upper Fan, Middle Fan and Lower Fan. The complete facies of Fan Delta are shown by its sedimentary characters (grain size, sedimentary structure and content) and hydrodynamics. Further research in Muara Pingai may focus in Fan Delta Evolution with dating by carbon content and Fan Delta dimension that may be useful for sedimentary rate calculation and development of the Muara Pingai Fan Delta.