CRETACEOUS IN SAKHALIN AND CRETACEOUS EVENTS IN N.PACIFIC

萨哈林岛的白垩纪和北太平洋的白垩纪事件

基本信息

批准号：
05041068
负责人：
KASE Tomoki
金额：
$ 10.24万
依托单位：
NATIONAL SCIENCE MUSEUM
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05041068/
关键词：
Paleontology Paleomagnetics Cretaceous Ammonite K-T boundary C-T boundary Sakhalin Biostratigraphy 生層序古地理

项目摘要

The Cretaceous System in the Naiba, Sinegorsk, Ai, Pugachevo and Makarov area of southern Sakhalin, Russia has been investigated from a viewpoint of paleontology, biostratigraphy and paleomagnetics in connection with the Cenomanian-Turonian marine anoxic event and the Cretaceous terminal mass extinction event.1. The Cretaceous in the Naiba area ranges continuously from the Albian to Maestrichtian in age, and is devided into four stratigraphic units. Well-stratiphied, fossil-less, dark-colored mudstone of the upper part of the Ai Formation and the lower half of the Naiba Formation (Albian to Turonian age) appears to have deposited under marine anoxic events. Upper part of the Bykov Formation includes ammonites and inoceramids abundantly and can be assinged to Santonian age. Krasnoyarka Formation ranges from Campanian to Maestrichtian, within which three characteristic ammonite assemblages have been recognized. The Canadoceras multicostatum assemblage (upper Campanian) and the Zelandites … More varuna assemblage (Maestrichtian) ares in common with those found in the contemporaneous strata of the Soya area, Wakkanai and the Awaji area, respectively. There is some possibility to exist Danian strata in the upper part (200 to 300 meters thick) of the Krasnoyarka Formation in the Naiba and Sinegorsk areas, but we have yet get any reliable fossil evidence. If this is so, however, there is no characteristic geologic phenomena in the Naiba area that suggest the Cretaceous terminal event.2. The Cretaceous succession in the Makarov area ranges from Santonian to Maestrichtian in age. We have recognized four fossil assemblages (Anapachydiscus sutneri Ass. , A.naumani-Inoceramus orientale Ass. , Eupachydiscus haradai-I.schmidti Ass. , Canadoceras kossmati Ass.) in the Bykov Formation and three fossil assemblages (C.multicostatum -Saghalinites teshioensis Ass. , Gaudryceras tombetsense-Pseudophyllites indra-Inoceramus hetonaianus Ass. , Pachydiscus cf. flexuosus-Gaudryceras sp. Ass.)in the Krasnoyarka Formation. We can not detect the Cretaceous-Tertiary boundary in this area. Less

Naiba，Sinegorsk，AI，Pugachevo和Makarov地区的白垩纪系统是从古生物学，生物学造影和古磁学的角度进行了调查的，与Cenomanian-turonian海洋氧化事件有关Naiba地区的白垩纪范围从Albian到Maestrichtian的年龄段连续，并被分为四个地层单位。 AI地层上部和Naiba地层的下半部分（Albian至Turonian Age）的上部的井层，无化石，深色的泥岩似乎已经沉积在海洋缺氧事件下。 Bykov地层的上部包括氨基和无染色体绝对，可以主张到桑顿时代。 Krasnoyarka组的范围从Campanian到Maestrichtian，其中三个特征性的氨矿会得到认可。加拿大多体式组合（上坎帕尼亚人）和Zelandites…更多的瓦鲁纳组合（Maestrichtian）与在大豆地区，Wakkanai和Awaji地区的当代层中发现的瓦鲁纳组合（Maestrichtian）共有。在Naiba和Sinegorsk地区的Krasnoyarka组的上部（200至300米）中存在Danian层，但我们尚未获得任何可靠的化石证据。但是，如果是这样，则Naiba地区没有特征的地质现象，暗示了白垩纪末端事件。2。马卡罗夫地区的白垩纪成功范围从桑托尼亚人到马斯特里奇人。我们已经认识到四个化石组合（Anapachydiscus sutneri ass。，a.naumani-inoceramus Orientale Ass。 gaudryceras p-phylites the the the themaus sp。我们无法检测到该区域的白垩纪 - 距离边界。较少的