Colour stratigraphy of Tertiary mudrocks based on spectrophotometry

2016 Fiscal Year Final Research Report

• Project/Area Number: 25800289
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Stratigraphy/Paleontology
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: TuZino Taqumi 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 主任研究員 (80357516)
• Research Collaborator: YANAGISAWA YUKIO 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 上級主任研究員 ; KUDO TAKASHI 国立研究開発法人産業技術総合研究所, 地質情報研究部門, 上級主任研究員
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 色層序学 / 分光測色 / スペクトラム / 泥岩 / 第三紀 / 珪藻 / 石灰質 / 陸源砕屑物

Outline of Final Research Achievements

The purpose of this research is to establish colour stratigraphy of the Tertiary mudrocks in Japan, based on spectrophotometric analysis. Multidisciplinary analyses (XRD, XRF, CNS, point-counting) were carried in order to reveal the reason of mudrock colour.
The mudrocks in the back-arc region can be classified as several colour stratigraphic divisions, accompanying with minor regional variations. The hue depends on siliciclastic/biogenic ratio and the brightness depends on amount of calcareous biogenic debris and organic matter. The mudrocks in the fore-arc region, however, show homogeneous colours. The spectroscopic analysis reveals the characteristics of the origin material of mudrock colour, suggesting Fe-including clay minerals and denying geothite nor haematite.

Free Research Field

層序学