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Carbonates and Evaporites

, Volume 17, Issue 1, pp 44–52 | Cite as

Geochemical study of lime-mud borings and associated coral-reef limestones in the intertidal flat of Kondoi Beach, Taketomi Island, Okinawa, Japan

  • Satoshi YamamotoEmail author
Article
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Abstract

Various types of numerous lime-mud borings have been discovered in the intertidal limestone and coral (Acropora) framestone at Kondoi Beach of Taketomi Island, Okinawa, Japan. Lime-mud borings may be formed by a mechanism similar to that for the micrite envelopes in molluscan shells and other carbonates. The lime-mud borings and surrounding limestone/coral framestone were pairedwisely, sampled and analyzed geochemically. The lime-mud borings show a rather uniform mineralogical composition (about 80% high-Mg calcite (HMC), 10% aragonite, and 10% low-Mg calcite (LMC), whereas the surrounding limestone appears HMC-rich and the coral framestone shows aragonite-rich carbonate mineralogies. Detailed elemental compositional studies suggest precipitation and filling mechanisms of clay-size lime muds in bored void space. Multiple boring of limestones and corals by boring organisms may produce several isolated void spaces that become filled with seawater, and authigenic clay-size crystals of HMC-rich carbonates may precipitate in the bored void space and fill the void space. The HMC-rich and clay-size carbonates eroded from the lime-mud borings may be important sources for the fine fraction of lime mud in the coral reef basins.

Keywords

Coral Reef Aragonite Micrite Intertidal Flat Sedimentary Petrology 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2002

Authors and Affiliations

  1. 1.Laboratory of Oceanography, Faculty of ScienceUniversity of the RyukyusOkinawaJapan

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