8 research outputs found
On the wad-minerals from the cavern environment
Get PDFThe wad-minerals from limestone caves of Yugoslavia, China and Japan were studied. X-ray diffraction analysis revealed five minerals; birnessite, 10A-manganite, pyrolusite, todorokite and goethite. The heavy metal elements, Mn, Zn, Fe and Cr have been detected by X-ray fluorescence analysis and their contents were roughly determined. The condensation water introduced directly from the covering soils formed by the continental weathering and the deriving corrosive water interaction with limestone could be the input sources of manganese and other metal elements into the system
Stratigraphy of the Pleistocene and Holocene sediments associated with correlation of some tephra beds in the Matsuyama Plain, Ehime Prefecture, southwest Japan
No full textThe Early Pleistocene Ohkubo Formation near Ohkubo, Johen Town, Southwestern End of Ehime Prefecture -Environmental Geology of West Shikoku, part 10-
No full textDiatom, contributors of coralloid speleothems, from Togawa-Sakaidani-Do Cave in Miyazaki Prefecture, Central Kyushu, Japan
Get PDFCoralloid speleothems are commonly distributed in Togawa-Sakaidani-do Cave in Miyazaki Prefecture, Central Kyushu, but their speleological study has not heretofore been achieved. Light and scanning microscopes analyses revealed that coralloid speleothems consist of alternating layers of diatom colonies, detrital minerals and clay. Electron microprobe analysis shows coralloid speleothems to be silicious. This paper asserts that diatom (genus Melosira) is one of the important contributors to siliceous coralloid speleothems in the threshold zone at non-calcareous caves
