@article{oai:kanazawa-u.repo.nii.ac.jp:00055369,
 author = {Tazaki, Kazue and Tazaki, Fumie and Okuno, Masayuki and Takehara, Teruki and Ishigaki, Yasuhito and Nakagawa, Hideki and 田崎, 和江 and 田崎, 史江 and 奥野, 正幸 and 竹原, 照明 and 石垣, 靖人 and 中川, 秀昭},
 issue = {2},
 journal = {地質学雑誌, The Journal of the Geological Society of Japan},
 month = {Feb},
 note = {イタリア・トスカーナ州南部のマレンマという地域には，イオウ臭が強くpH7，水温37°Cの棚田状のサトゥルニア天然温泉がある．本研究では，サトゥルニア天然温泉で産出される，豆石，褐色石灰岩および緑色バイオマットについて，化学組成，鉱物組成，微生物的特徴を調べた．全岩試料のXRD分析により，豆石は方解石，自然硫黄，石英から構成されており，褐色石灰岩は雲母，自然硫黄，菱沸石，7 Å粘土鉱物から構成されていることを明らかにした．また，全岩試料のXRF分析により，褐色石灰岩にはO，Si，Al，K，Ca，Fe，Naが多く，豆石にはC，O，Ca，Sr，Sが多いことを明らかにした．更に，豆石の断面をSEM-EDSで観察・分析・元素濃度分布図を行ったところ，全岩試料のXRDおよびXRF分析では検出されなかった微生物とSrを含むフランボイダル黄鉄鉱や燐灰石が発見された．, A well-known terrace-forming hot spring is located at Saturnia in the Maremma area of southern Toscana, Italy. The waters are circumneutral (pH around 7), mesophilic (around 37°C), and give off a strong sulfurous odor. Pisoliths, brown limestone, and green microbial mats are found in the area. Hot spring structures and compositions are determined based on mineralogical and chemical data obtained with a powder X-ray diffractometer (XRD) and an X-ray fluorescence analyzer (XRF). Microbial parameters are determined on sub-millimeter scales using a scanning electron microscope, equipped with an energy-dispersive X-ray spectrometer (SEM-EDS).
XRD results indicate that the pisoliths are composed of calcite, native sulfur, and quartz, whereas the brown limestone contains mica, native sulfur, chabazite, and 7 Å clay minerals. XRF analysis indicates that the pisoliths contain mainly C, O, Ca, S, Si, and Sr, whereas the brown limestone contains high concentrations of O, S, Al, K, Ca, Fe, and Na. Because the pisoliths are Ca-rich, concentrations of heavy metals (Sr, Sn, and Pb) at the aqueous interface can be explained by combining XRF chemistry, XRD mineralogy, and SEM-EDS observations of green microbial mats. SEM-EDS elemental maps of the pisolith indicate the presence of apatite and framboidal pyrite crystals., 金沢大学理工研究域地球社会基盤学系},
 pages = {45--60},
 title = {イタリア・トスカーナ州・サトゥルニア天然温泉における豆石の形成},
 volume = {122},
 year = {2016}
}