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Title Transcription
ソウジョウ チャート ノ タイセキ リズム ニヨル チソウ ノ タイヒ
Title Alternative
Straigraphic Correlation by Depositional Cycles of Bedded Cherts, Southwest Japan
File
language
eng
Author
Douzen, Kaori
Imoto, Nobuhiro
Description
Upper Triassic bedded cherts are good example of recorded depositional cycles corresponding to the Milankovitch cycles, 100,000 years and 400,000 years, because radiolarian blooming was effected by nutrient supply in high-stand of sea level. Thus reading these cycles in bedded chert sequence by combination of thicker chert beds (activated radiolarian blooming and rapid deposition) and following thinner chert beds (weakened blooming) could be a new method for global correlation. This cycles clearly can be read in the Upper Triassic especially upper Carnian to lower Norian of relatively oceanic regression, while in the Middle Triassic, chert beds were deposited steady and evenly because of less effect of geologic cycles to radiolarian blooming at the time of relative transgression.

Journal Title
Memoirs of the Faculty of Science, Shimane University
Volume
27
Start Page
55
End Page
64
ISSN
03879925
Published Date
1993-12-25
NCID
AN00108106
Publisher
島根大学理学部
Publisher Aalternative
The Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering
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