Geomicrobiological studies of hot spring deposits for ancient earth environment reconstruction.

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This study focuses on water-mineral-bacteria interaction on carbonate-rich hot spring, sulfur-rich hot spring and Mn-containing cold spring. First, relationship among flow rate, texture and bacterial distribution was cleared in carbonate sediment (travertine).Cyanobacterial metabolic activates on iron-rich deposit surface were observed with microelectrode profiles. In sulfur-rich hot spring, metabolism of sulfur oxidizing bacteria changed water chemical properties. Mn oxides in cold spring were precipitated by iron oxidizing bacteria.