Uematsu, H. and Sashida, K. (1966) Occurrence and Significance of Late Jurassic Radiolarians in Allochthonous Blocks of the Torinosu-Type Limestone in the Northern Shimanto Terrane, Shikoku, Japan. Journal of Geography, 105, 53-66.
https://doi.org/10.5026/jgeography.105.53

has been cited by the following article:

• TITLE: Characteristics of Fluorescent Inclusions in Quartz Crystals Hosted by Organic-Rich Black Limestone in Sakawa Town, Kochi Prefecture, Southern Shikoku, Japan

  AUTHORS: Shigenori Ogihara

  KEYWORDS: Alkyl Naphthalene, Alkyl Phenanthrene, Double-Terminated Quartz, Fluorescent Inclusion, Torinosu Limestone

  JOURNAL NAME: Open Journal of Geology, Vol.15 No.11, November 26, 2025

  ABSTRACT: The Torinosu Limestone in Sakawa Town, Kochi Prefecture, Japan, is rich in organic matter and has long been recognized as a black limestone with a high concentration of organic material. Quartz containing petroleum-like substances occurs in veins within this black limestone. The quartz hosting these petroleum-like fluid inclusions typically exhibits a bipyramidal to tabular habit. Under ultraviolet light, the fluid inclusions display intense fluorescence. The polycyclic aromatic hydrocarbon (PAH) fraction extracted from the fluorescent quartz contains significant amounts of methylnaphthalene and methylphenanthrene, which are responsible for the observed fluorescence. In addition to these compounds, unsubstituted pyrene, chrysene, and perylene were detected in the black limestone. Methylnaphthalene, methylphenanthrene, and squalene—the primary fluorescent components—were likely derived from the organic-rich black limestone during the formation of the quartz veins and subsequently incorporated into the quartz.