Lithofacies and ichnofacies of turbidite deposits, West Java, Indonesia

Abstract

This study focuses on the analysis of sedimentary facies and ichnogenus variations to determine the palaeogeographic setting of turbidite deposits that are clearly exposed in the surroundings of Majalengka area, West Java, Indonesia. Lithofacies variation in turbidite deposits, identified from detailed stratigraphic sections, were visually presented as a composite log and indicated a thickening and coarsening pattern due to a regressive event. Trace fossils exposed in all stratigraphic levels consist of Thalassinoides, Chondrites, Cruziana and Planolites. They are commonly found in a series of thin to medium bedded fine grained turbiditic sandstones intercalated with shales. Hereinafter, the integration analysis in between sedimentology and ichnology data, the sediment shed into the basin in the submarine channelized related to slope system. Such findings cast no doubt as to whether integrated sedimentary facies and ichnofacies analysis can be viewed as precise methods for sedimentary basin interpretation, in which external parameter, for example magmatic processes, also are considered to play a role.

Depositional system of Halang Formation from Ci Mande and Panaruban River outcrop: an interpretive based on lithofacies and trace fossil

“…This study 5nalyses the classification of trace fossils based on ichnogenera, the genera of trace fossils, namely Thalasinoides, Chondrites, Skolithos, and Rhizocorallium. Ichnogenera are used to categorize and identify different types of traces left by ancient organisms in sedimentary rocks [16].…”

“…Post-depositional traces found deep within turbidite soles are not the best indicators for understanding the initial seafloor conditions when the sediments were first deposited [15]. Lithofacies and ichnofacies analyses with other geological data, such as sedimentary structures, geochemistry, and paleontological evidence, geologists can construct a comprehensive picture of the paleogeography and sea-level changes that occurred in the past [16].…”