Plio-Pleistocene sedimentation and palaeogeographic reconstruction in the Poso Depression,Central Sulawesi,Indonesia:from a sea channel to a land bridge  

作　　者：Abang Mansyursyah Surya Nugraha Ramadhan Adhitama Adam D.Switzer Robert Hall 

机构地区：[1]Earth Observatory of Singapore,Nanyang Technological University,50 Nanyang Ave.,639798,Singapore [2]Fakultas Teknologi Kebumian dan Energi,Universitas Trisakti,Kampus A Gedung D,JI.Kyai Tapa No.1,Grogol,Jakarta 11441,Indonesia [3]Asian School of the Environment,Nanyang Technological University,50 Nanyang Ave.,639798,Singapore [4]SE Asia Research Group,Department of Earth Sciences,Royal Holloway University of London,Egham,Surrey,TW200EX,UK

出　　处：《Journal of Palaeogeography》2023年第3期331-357,共27页古地理学报（英文版）

基　　金：supported by the SE Asia Research Group of Royal Holloway University of London,United Kingdom,which is backed by a consortium of oil companies;supported by the Earth Observatory of Singapore(EOS),Singapore and comprises EOS contribution number 508

摘　　要：The Poso Depression provides a record of Plio-Pleistocene environments and palaeogeography of Central Sulawesi.Outcrop-based sedimentological and provenance studies suggest that during the Pliocene the Poso Depression was a sea channel connecting Gorontalo and Bone bays formed in an asymmetric half-graben.The Pliocene history began with deposition of the Puna Formation with fan deltas at the eastern basin margin and channel complexes in the deep-water basin further east.Analyses of light and heavy minerals indicate the main sediment source was ultrabasic rocks in East Sulawesi with minor and intermittent magmatic and metamorphic input from West Sulawesi.Later,in the Middle to Late Pliocene,carbonates of the Poso Formation accumulated on the eastern basin margin.They are unconformably overlain by shallow marine glaucophane-rich siliciclastics of the Pleistocene Lage Formation that are associated with the rapid exhu-mation and uplift of the Pompangeo metamorphic complex.This uplift led to the development of a land bridge connecting western and eastern Sulawesi.The terrane evolution favoured increasing the area of exposed land due to rapid tectonic uplift,which when combined with the tropical climate,contributed to faunal speciation and dispersal in Sulawesi.

关 键 词：PALAEOGEOGRAPHY Poso SULAWESI Sedimentation history PROVENANCE 

分 类 号：P531[天文地球—古生物学与地层学] P534.6[天文地球—地质学]