READING OF THE TRIGGER RECORDS OF SEDIMENTARY EVENTS - A PROBLEM FOR FUTURE STUDIES

Authors
Citation
T. Shiki, READING OF THE TRIGGER RECORDS OF SEDIMENTARY EVENTS - A PROBLEM FOR FUTURE STUDIES, Sedimentary geology, 104(1-4), 1996, pp. 249-255
Citations number
29
Categorie Soggetti
Geology
Journal title
ISSN journal
00370738
Volume
104
Issue
1-4
Year of publication
1996
Pages
249 - 255
Database
ISI
SICI code
0037-0738(1996)104:1-4<249:ROTTRO>2.0.ZU;2-L
Abstract
Sedimentary records of various three- to four-dimensional patterns of nature have recently attracted the special attention of many geologist s. The dramatic development of rhythmic sequence stratigraphy is a con spicuous recent instance. The significance of event sedimentation in g eohistory, however, has not been examined sufficiently. The problem of how to read the records of triggers or thresholds of sedimentary even ts has been ignored. The difficulty of solving this problem concerns t he difference in patterns between natural sedimentary processes and th eir resulting sediments. Terminological confusion of event deposits is another cause which hinders our taking note of this problem. A few ex amples of endeavours to discriminate the threshold of sedimentary even ts are shown by the analysis of two kinds of turbidites of the Mid-Gua temala Trench, the investigation of slump-derived turbidites of the Su ruga Trough, and the study of the seismoturbidites in Lake Biwa. Well- focused investigations of features of trigger-known sediments is the b est strategy to find the criteria for discriminating the triggers or t hresholds based on sedimentary records of various sedimentary events. From this point of view, more detailed studies of the Santorini Erupti on-induced homogenites, the K-T boundary impact-induced tsunamiites, t ogether with the Lake Biwa seismic turbidites, are very important. Fur ther efforts should be made to find and investigate as many trigger-id entifiable sediments as possible.