Testing the application of quartz and feldspar luminescence dating to MIS 5 Japanese marine deposits

Christine Thiel, Sumiko Tsukamoto, Kayoko Tokuyasu, Jan-Pieter Buylaert, Andrew Sean Murray, Kazuhiro Tanaka, Masaaki Shirai

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The applicability of both quartz and feldspar luminescence dating was tested on twenty-five samples from a marine succession now forming a coastal cliff at Oga Peninsula, Honshu Island, Japan. The quartz optically stimulated luminescence (OSL) signal shows thermal instability and linear modulated (LM)-OSL analysis revealed the dominance of a slow component. When compared with independent age control provided by two marker tephras, the quartz OSL ages grossly underestimate the depositional age. In contrast, potassium (K)-rich feldspar is a suitable dosimeter when measured using post-IR infrared stimulated luminescence (IRSL) at 225 °C (pIRIR225). Scanning electron microscope (SEM) analyses on the feldspar extracts revealed that the grains are amorphous with small crystalline inclusions; using standard internal dose rate parameters, this would result in a too large dose rate. Dose rates were calculated using the observed grain size of 40 ± 20 μm with an assumed K concentration of 12.5 ± 0.5%. The fading corrected pIRIR225 ages agree well with independent age control, and the sediments of the Katanishi Formation were deposited between 82 ± 6 and 170 ± 16 ka. This study demonstrates that pIRIR dating of feldspar is a powerful chronological tool for the dating of sediments of volcanic origin.
    Original languageEnglish
    JournalQuaternary Geochronology
    Volume29
    Pages (from-to)16-29
    ISSN1871-1014
    DOIs
    Publication statusPublished - 2015

    Keywords

    • Quartz OSL
    • Slow OSL component
    • Post-IR IRSL
    • Internal dose rate
    • Japan

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