著者・編者HARTOKO, Agus
AISYAH, Siti
JOSAPHAT, Tetuko Sri Sumantyo
PRINGGENIES, Delianis
タイトル（掲載誌）Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集
一般注記type:text
[ABSTRACT]The formation of Indonesian islands at the Oligosen 50 - 30 million years, where Indo-Asian peninsular with Sumatera, Java, Borneo, Kalimantan islands plate collided to the Australian and Pacific plate to form Papua Mollucas and Sulawesi islands. The formation Java with the up-lift of the mountainous southern Java by subduction of the Australian plate. Spatial reconstruction concept based on postulate that Muria mountain was before separated with Java island about 50 million years. Satellite data and geological maps were used to analise the phase of sedimentation process at the era of Pliosen 2-million years and identify the sequence of ancient coastline movement to the unification become the existing Java condition. Collected mollusc fossils samples were analysed using Accelerator Mass Spectrometer (AMS) radiocarbon.Field validations grouped into 3-phases. Phase-1 the Pliosen era about 2 million years the south Java mountain zone uplift lead to the formation of Sangiran-dome and brackish water swamp palaento-ecology zone. Variety of brackish water and marine Mollusc fossils of Turritella sp, Strobus.sp, Murex.sp, Ostrea.sp, Orthaulax.sp, Natica vitellus, Telescopium telescopium, Anadara sp, Dosinia sp found at “Bukuran village” (“bukur” in Javanese means as gastropods). This mollusc dome characterised with dark high organic clay sediment. Result of AMS 14C dating revealed that Sangiran sample are 35390 ± 258 and 30216 ± 183 14C Age BP (Before Present). The phase-2 expedition discover the ‘ancient fringing-reef’ and mollusc fossils at Grobokan and the ‘trapped ancient seawater’ locally known as ‘Bleduk-Kuwu’ with mud-blow, salt and mollusc fossils of Antigono chemnitzii, Cullelus dilatatus, Plotia scabra and Tibia modesta. In geological term the zone known as ‘north Kendeng lime-stone mountain or the front-arch formation’ as the ancient coastline of “Muria strait” that separate Muria mountain and Java and recognised as marine-palaentological zone. Sample of this zone was 23127 ± 107 and 7571 ± 39 14C Age BP. Phase-3, Patiayam dome (Ancient Muria Strait) at Kudus revealed vertical eco‐geological layers of high organic freshwater, marine Mollusc and coraline marine sediment with fringing-reef fossil. Variety of marine mollusc of Tridacna.sp, Cassis tuberosa, Tonna allium, Haliotis asinine, Terebridae, Pseudodon vondenbuschianus, Elongaria orientalis, Ampullina bandongensis, Anadara pilula and Filopaludina javanica with 23871 ± 112 and 12227 ± 56 14C Age BP.
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）