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Analysis of sedimentary environment of the upper Cenozoic in Niigata Sedimentary Basin

新泻沉积盆地上新生界沉积环境分析

基本信息

批准号：
61460053
负责人：
TATEISHI Masaaki
金额：
$ 3.2万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The Folded and thick Cenozoic sequence is distributed in the Niigata Sedimentary Basin. On the bases of stratigraphy reinvestigated, the sedimentary environment of the Cenozoic sequence was analyzed from the lithofacies and biofacies.The following results are important stratigraphically. 1) Higashi-Kubiki district: The Upper Miocene to Pleiocene Tamugigawa Formation, mainly composed of turbidite sediments, is interfingerred with the Shobudani Formation, mainly composed of massive mudstone.2) Nishi-Kubiki - Otari district: The Tenguhara-yama Volcanic Clasts, considerred to be correlated to the Nanatani Formation, is intercalated within the middle part of the Nambayama Formation correlated with the Nanatani to Lower Teradomari Formations.For the sedimentary environment, the following resilts are important.1) In Higashi-Kubiki district, the differentiation of sedimentary basin and the supply of coarse clastics from the provinance uplifted were taken place from the late Miocene to Pleiocene time. The basin was composed of the trough-type basin and horst.2) Formative process of Arahama Sand Dune in the Kashiwazaki district are investigated based on the sedimentary structure and textural property. The textural propertiy of sand of paleo-sand dune shows the characteristics of sand transported by wind same as the Holocene sand dune.3) Argonautidae, Dephalopoda from the type locality of Teradomari Formation is the first occurrence in the Niigata Sedimentary Basin. The occurrence is particulary important to the consideration of the paleo-oceanic environment, that is, the inflow of the warm current.

新泻沉积盆地内分布着褶皱的巨厚新生代层序。在地层学重新研究的基础上，从岩相、生物相等方面对新生代层序的沉积环境进行了分析，取得了以下重要的地层学成果。1)东久备郡：上中新统至上新世Tamugigawa组主要由浊积岩沉积物组成，与Shobudani组主要由块状泥岩组成。2）Nishi-Kubiki - Otari地区：与七谷组对应的天池原山火山碎屑岩夹在与七谷组至寺渡下组对应的南山组中部。1）在东久备地区，晚中新世至上新世发生了沉积盆地的分异和来自造山带隆起的粗碎屑物质的供给。2）从沉积构造和结构特征出发，研究了柏崎地区荒滨沙丘的形成过程。古沙丘沙子的结构特征显示出与全新世沙丘相同的风搬运沙子的特征。3）来自寺守町组模式产地的Argonautidae、Dephalopoda是新泻沉积盆地的首次出现。这一现象对研究古海洋环境，即暖流的流入具有特别重要的意义。