A comprehensive re-investigation on the chronology of the Javanese fossil hominids

本研究旨在重新考虑爪哇古人类化石的古代，并为爪哇直立人的进化史建立一个时间框架，并进行了以下调查。从爪哇中部和东部的含古人类化石的地层中，收集了一系列沉积物样品用于定年，并检查了它们的地层位置。岩石学分析和利用氩-40/氩-39和裂变径迹法对tephra样品进行的试验定年表明，一些tephra用于测年是可行的，但由于碎屑矿物污染物，大量tephra层可能不适合测年。研究了邻苯二甲酸二烯丙酯（DAP）树脂在裂变径迹测年中用作外部检测器的性能。也报道了用这种更有用的塑料探测器进行裂变径迹测年的zeta校准值。4 .对爪哇中部和东部的古人类化石沉积物进行了古地磁研究，为Sangiran地区提供了新的数据，为Mojokerto地区提供了新的数据支持，也为sambungmacan地区提供了初步数据。利用一种新的地球化学方法，利用电感耦合等离子体光谱法对骨骼进行多元素分析，并结合氟测定法，有助于在没有充分的物源背景的情况下对爪哇的一些古人类化石进行地层分配。

The present research was designed to reconsider the antiquity of the Javanese hominid fossils and to develop a chronological framework for the evolutionary histories of Homo erectus in Jawa, and the following investigations have been made.1.Series of sediment samples for dating have been collected with checking their stratigraphic positions from hominid fossil bearing formatins in Central and East Jawa.2.Petrographic analyses and pilot dating using argon-40/argon-39 and fission-track methods on the tephra samples, have shown that some tephras are practical for chronometric dating, but a large number of tephra layers may not feasible for dating due to detrital mineral contaminants.3.The properties of diallyl phthalate (DAP) resin were studied with reference to its use as an external detector in fission-track dating. And also zeta calibration values for fission-track dating with this more useful plastic detector have been reported.4.A paleomagnetic study was carried out on hominid fossil bearing sediments in Central and East Jawa, which has given new data for the Sangiran area and additional data supporting the previous results on Mojokerto, and also preliminary data for Sambungmacan.5.Stratigraphic allocation of some hominid fossils from Jawa without sufficient context for provenance has been assisted by using a new geochemical approach by multielement analyses of bone using inductively coupled plasma spectrometry, in company with the fluorine assay.