Notes on Freshwater Coated Grains of the Hengchun Peninsula

This research focuses on the geographical distribution and occurrence of freshwater coated grains on the Hengchun Peninsula. Field surveys showed that coated grains were mainly distributed in areas with spring water seepage in Siangjiao Bay and the Gongyuan Road Reservoir, and a small amount has developed at Fongchuisha. Most coated grains were well-rounded with a smooth surface. However, those which had grown in the catchment sedimentation sink of the Gongyuan Road Reservoir site are unique. Each has a peculiar outer layer composed of short dense branching protrusions. The results of rock thin section and electron microscope inspections showed that the formation of these two types of coated grains is by intermittent rolling and the growth of microorganisms on the top of the grain. Their quite different appearances may reflect the relative stability of the growth substrates.

關鍵字

spring water ； coated grains ； oncoid ； freshwater carbonates ； Hengchun Peninsula

並列摘要

本研究聚焦於恆春半島淡水包殼粒的地理分布與產狀。經由野外調查結果，顯示包殼粒主要分布於香蕉灣湧泉與墾丁公園路湧泉樣區，少量發育於風吹砂蓄水池旁地面。大部分的包殼粒為外表平滑的圓球狀，但在墾丁公園路湧泉匯集沉澱池中，則發育另一種表面具有密集分支狀突起的包殼粒。經由岩石薄片與電子顯微鏡檢視結果，顯示這兩種包殼粒的形成，均與間歇性滾動及微生物生長有關；而其相當不同的外表形態與內部微細結構組成，則可能反映其生長環境底質的相對穩定程度。

並列關鍵字

湧泉；包殼粒；核形石；淡水碳酸鹽；恆春半島

國際替代計量

Notes on Freshwater Coated Grains of the Hengchun Peninsula

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