ICHNOLOGICAL CHARACTERISTICS IN THE MODERN MAHAKAM DELTA, EAST KALIMANTAN
Ery Arifullah 1), Andang Bachtiar 2) , Djuhaeni 3)
1 Master Student, Department of Geology, ITB
2GDA Consultant Jakarta
3Department of Geology, ITB
earifullah@plasa.com
Abstract
Detailed analysis of Modern Mahakam Delta sediments concentrated on identifying ichnological and sedimentological characteristics of four deltaic environments. These include: 1) distributary channel, which are typically low diversity and bioturbation index with displaying Psilonichnus, Skolithos, Ophiomorpha, Monocraterion, Teichichnus Arenicolites, Planolites, Thallasinoides, escaping traces, and Glossifungites ichnofacies; 2) estuarine tidal bar which are typically balanced diversity and biotu rbation index with displaying Psilonichnus, Ophiomorpha, Arenicolites, Skolithos, Siponichnus, Monocraterion, Paleophycus, Helminthopsis, Teichichnus, Planolites, Chondrites, Paleodictyon, crawling traces, and vertebrate track; 3) interdistributary area which are typically medium diversity and high biotu rbation index with displaying dominated Arenicolites, Ophiomorpha, Conichnus, Skolithos, Scaubcylindrichnus, Diplocraterion, Rosselia, Teichichnus, Chondrites; 4) mouth bar sediments are displaying Ophiomorpha, Planolites, grazing traces, crawling traces, fecal casting, and abundance dwelling tubes Skolithos like.
Ichnological research in the Modern Mahakam Delta potentially improves our understanding of deltaic facies sedimentology. Our findings suggest that sedimentological processes, substrate types and salinity control ichnological characteristics.
From : The 33rd Annual Convention & Exhibition 2004 Indonesian Association of Geologist
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