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Transport process of sand grains from fluvial to deep marine regions estimated by luminescence of feldspar: example from the K umano area, central J apan
Author(s) -
Shirai Masaaki,
Hayashizaki Ryo
Publication year - 2013
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/iar.12026
Subject(s) - feldspar , sedimentary depositional environment , geology , mineralogy , turbidite , erosion , luminescence , sediment , fluvial , grain size , geochemistry , geomorphology , materials science , paleontology , quartz , structural basin , optoelectronics
Using the concept of bleaching in optical dating, a new index of sediment sample bleaching percentage ( BLP ‐2) was developed and applied to evaluate sand grain transport from riverine to deep‐marine environments. As bleached grains in modern sediments have no optically stimulated luminescence ( OSL )/infrared stimulated luminescence ( IRSL ) signal, bleached and unbleached feldspar grains are distinguished by IRSL intensity. The BLP ‐2 distribution of present deposits around the K umano area, on the P acific coast of central J apan, suggests that sand grains in surface turbidites obtained from the bottom of the K umano T rough are of flood/storm origin rather than seismogenic origin. The distribution of BLP ‐2 tentatively suggests sand grain erosion–transport–depositional processes; for example, origin and transport agencies of shelf sand, and influence of coastal erosion on the beach deposit. Although the present BLP analysis is not yet supported by a rigorous statistical test, it is useful to distinguish recent deposition and remobilization of sand grains. Furthermore, if the depositional age and the luminescence age of sand grains are accurately estimated, sand grain transport processes of old (late Q uaternary) sediments may be estimated by the methodology similar to that of the present study.