Tectonics and paleogeography of the Sunda and Banda Islands

巽他和班达群岛的构造和古地理

基本信息

批准号：
07041084
负责人：
SASHIDA Katsuo
金额：
$ 2.75万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07041084/
关键词：
radiolaria conodont Gondwana collision accretion Southeast Asia Tethys ocean

项目摘要

Although our laboratory works are still in progress, I will describe briefly the results of our investigation in Timor and Sumatra Islands in 1995.We made geologic investigations at and along the logging roads from Soe to Kolbano, Soe to Tanjunmenu and Nikiniki to Boti. We discriminated both Upper Triassic and Lower Cretaceous radiorian faunas from fine calcareous sediments cropping our along these logging roads. Among the Lower Cretaceous radiolarian faunas, we recovered Non-Tethys type radiolarian fauna which has peculiar multisegmented Nasselarian radiolarians.We collected red limestone samples which belong to the Pemian Maubisse Formation and contain abundant fossils such as corals, brachiopods, ammonites, trilobites and others.Altemation of sandstone and shale is cropping out at the road side cliff near Swanae. This alternation yields large inoceramid bivalves, corals and radiolarians. Radiolarian fauna from this altemation is referable to the rep resentative ones in the Lower Cretaceous in Tethys regions.We discriminated Carboniferous and Pemian fusulinds from Bukitkingi ad Padan detan in Sumatra lslands, respectively. These fusulinids faunas have Tethyan affinity.Shallow reefal limestone containg corals, algae and stromatolites has been first discovered from the north coast of the Lake Toba, in Sumatra lslands.

虽然我们的实验室工作仍在进行中，但我将简要描述我们 1995 年在帝汶岛和苏门答腊群岛进行的调查结果。我们在从 Soe 到 Kolbano、Soe 到 Tanjunmenu 以及 Nikiniki 到 Boti 的伐木道路上和沿线进行了地质调查。我们从伐木道路沿线的细钙质沉积物中区分出了上三叠世和下白垩世的放射动物群。在下白垩统放射虫动物群中，我们发现了非特提斯型放射虫动物群，具有独特的多节段纳瑟拉放射虫动物群。我们采集了属于佩米亚莫比斯组的红色石灰岩样品，含有丰富的珊瑚、腕足类、菊石、三叶虫等化石。斯瓦尼附近的路边悬崖上出现了砂岩和页岩的蚀变现象。这种交替产生了大型双壳类、珊瑚和放射虫。此次交替产生的放射虫动物群可参考特提斯地区下白垩统的代表性放射虫动物群。我们分别对来自苏门答腊岛Bukitkingi ad Padan detan的石炭系和佩米亚的Fusulinds进行了区分。这些fusulinids动物群与特提斯有亲缘关系。含有珊瑚、藻类和叠层石的浅礁石灰岩首先是在苏门答腊岛的多巴湖北岸发现的。