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Biostratigraphy and paleoenvironmental analysis of the Paleogene sequences of the northern Kyushu by calcareous nannofossil

钙质超微化石对九州北部古近纪序列的生物地层学和古环境分析

基本信息

批准号：
01540638
负责人：
OKADA Hisatake
金额：
$ 1.15万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540638/
关键词：
Kyushu Paleogene Calcareous nannofossils Biostratigraphy

项目摘要

The occurrence of calcareous nannofossils and biostratigraphic correlation are studied for the Paleogene marine sequences of five coalfields locating in the northern Kyushu Island. The nannoflora is investigated for the outcrop samples of the Amakusa, Sakito-Matsushima, Karatsu and Chikuho Coalfields as well as for the two offshore wells Drilled in the Ariake Sea (60-Ari-4 well) and off the western coast of the Nishisonogi Peninsula (59Nishi-3 well). A total of 82 taxs and 18 datum events spanning from the early Nfiddle Eocene to early Late Oligocene are recognized, and the studied sequences are correlated with each other by using these datum events.The Paleogene sequence of the Amakusa Coalfield ranges in age between the early Middle Eocene (Subzone CP 1 3a) and the Late Eocene (Zone CP 15). The Yotsuyama Formation of the Make Coalfield recovered in the 60-Ari-4 well corresponds to the upper part of the Amakusa sequence (Zones CP14-15). Though nannofossils are scarce in the outcrop samples of the Sakito-Matsushima Coalfield, core samples taken from the 59-Nishi-3 well are fairly fossiliferous, and the Nakado, Matsushima, Itanoura, Kakinoura. and Ohshima Formations are identifiable to -the uppermost Eocene (Subzone CP15b) through the upper Lower Oligocene (Zone CP17). The Eocene/Oligocene boundary is likely to be situated at very close to the boundary between the Nakado and Matsushima Formations. The Kishima Formation of the Karatsu Coalfield yields nannoflora of the earliest Oligocene (Subzone CP16a) and is correlated to the Matsushima and Itanoura Formations of the Sakito Matsushima Coalfield. The Hatatsu shale member of Karatsu Formation is the upper Lower Oligocene(Zone CP18)with small possibility of being the lower Upper Oligocene(Subzone CP19a). The Sakamizu and Yamaga Formations of the Chikuho Coalfield are the lower Upper Oligocene (Subzone CP19a).

对九州岛北方五个煤田古近系海相层序中钙质超微化石的产出情况及生物地层对比进行了研究。对阿马库萨、Sakito-Matsushima、加拉津和Chikuho煤田的露头样品以及在有明海（60-Ari-4井）和西之木半岛西海岸（59 Nishi-3井）钻探的两口近海威尔斯井的微植物群进行了调查。从Nfiddle始新世早期到晚渐新世早期共识别出82个层序和18个基准事件，并利用这些基准事件对所研究的层序进行了对比，阿马库萨煤田古近系层序的时代介于中始新世早期（CP 1 3a亚带）和晚始新世（CP 15带）之间。在60-Ari-4井中开采的Make煤田的四山组对应于阿马库萨层序的上部（CP 14 -15区）。虽然在Sakito-Matsushima煤田的露头样品中很少有超微化石，但从59-Nishi-3井采集的岩心样品相当丰富，Nakado，Matsushima，Itanoura，Kakinoura。和Ohshima组可识别至始新统最上部（Subzone CP 15 b）至渐新统上部（Zone CP 17）。始新世/渐新世界线可能位于非常接近Nakado组和Matsushima组之间的界线处。加拉津煤田的Kishima组产出最早渐新世（Subzone CP 16 a）的微植物群，并与Sakito Matsushima煤田的Matsushima组和Itanoura组相对比。加拉津组的Hatatsu页岩段为下渐新统上部（CP 18区），其为上渐新统下部（CP 19 a亚区）的可能性很小。筑丰煤田的坂水组和山贺组为上渐新统下部（CP 19 a亚区）。