Provenance of Sediment Deposits in Lake Tempe, South Sulawesi
), A. M. Imran(2), A. Hamzah(3), Busthan -(4), H. H. Pachri(5),
(1) Geology Department, Natural Science Faculty, State University of Gorontalo, Gorontalo
(2) Geology Department, Engineering Faculty, University of Hasanuddin, Makassar
(3) Geophysical Department, Natural Science Faculty, University of Hasanuddin, Makassar
(4) Geology Department, Engineering Faculty, University of Hasanuddin, Makassar
(5) Geology Department, Engineering Faculty, University of Hasanuddin, Makassar
Corresponding Author
Abstract
Sedimentation rate in Lake Tempe is a serious problem faced by the government and local communities due to the high sediment transport from upstream of several rivers that flow into Lake Tempe. This study aims to determine the source of the rock material based on analysis of heavy mineral sediment. The research area is located at the estuary of Bila River in Sidenreng Rappang Regency. The method used is test pit and surface sampling. Laboratory analyzes were performed is the analysis of grain size (granulometry), heavy mineral analysis (heavy mineral separation) and microscopic analysis. There are 14 types of heavy minerals found in the Tempe Lake namely: zircon, tourmaline, rutile (ZTR) as ultra stable mineral. The less stable minerals are epidote; and others are olivine, hipersten, augite, hornblende, biotite, casiterit,, brookit, apatite, magnetite and iron oxide. Source rocks of the minerals are interpreted from igneous and volcanic rocks of acidic to intermediate type.
Keywords
Provenance, Heavy Mineral, granulometry, Tempe Lake
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