\u6628\u65e5\u306e\u8a18\u8ff0\u306b\u8aa4\u308a\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u300c\u3061\u304d\u3085\u3046\u300d\u306e\u6398\u524a\u6df1\u5ea6\u306e\u8a18\u9332\u306f10km\u3067\u306f\u306a\u304f\u3066\u30012019\u5e74\u306e3262.5m\u3067\u3001\u79d1\u5b66\u6398\u524a\u3068\u3057\u3066\u4e16\u754c\u6700\u6df1\u3060\u305d\u3046\u3067\u3059\u3002\u65ad\u5c64\u3084\u8936\u66f2\u304c\u6fc0\u3057\u3044\u305f\u3081\u8a08\u753b\u3088\u308a\u3082\u6d45\u3044\u3068\u3053\u308d\u3067\u6398\u524a\u3092\u4e2d\u6b62\u3057\u305f\u3068\u306e\u3053\u3068\u3067\u3059\u3002\u5730\u9707\u306e\u9707\u6e90\u306b\u306a\u308a\u3046\u308b\u3068\u3053\u308d\u3092\u6398\u524a\u3057\u3066\u3044\u308b\u306e\u3067\u300c\u9670\u8b00\u8ad6\u300d\u306e\u6a19\u7684\u306b\u306a\u3063\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u3093\u306a\u306b\u67d4\uff08\u3084\u308f\uff09\u306a\u3082\u306e\u3067\u306f\u7121\u3044\u3067\u3057\u3087\u3046\u3002
\nhttps:\/\/www.jamstec.go.jp\/chikyu\/j\/nantroseize\/
\n\u3055\u3066\u3001\u53e4\u6c17\u5019\u3092\u6d77\u5e95\u5806\u7a4d\u7269\u3067\u8abf\u3079\u308b\u65b9\u6cd5\u3092\u3044\u304f\u3064\u304b\u898b\u3064\u3051\u307e\u3057\u305f\u3002\u4e00\u3064\u306f\u9178\u7d20\u540c\u4f4d\u4f53O-18\/O-16\u6bd4\u3067\u3059\u3002
\nhttps:\/\/nh.kanagawa-museum.jp\/www\/contents\/1709879351406\/simple\/wt_02v101.pdf
\n\u6d77\u6c34\u4e2d\u306e\u540c\u4f4d\u4f53\u6bd4\uff08\u5b87\u5b99\u7dda\u306b\u3088\u308aO-18\u540c\u4f4d\u4f53\u304c\u4f5c\u3089\u308c\u308b\u305f\u3081\u4e00\u5b9a\uff09\u2192\u6c34\u6e29\u306b\u3088\u3063\u3066\u6709\u5b54\u866b\u306e\u6bbb\u306b\u53d6\u308a\u8fbc\u307e\u308c\u308b\u540c\u4f4d\u4f53\u6bd4\u304c\u5909\u308f\u308b\uff08\u4f4e\u6e29\u3067\u306fO-18\u306e\u65b9\u304c\u53d6\u308a\u8fbc\u307e\u308c\u3084\u3059\u3044\uff09\u2192\u6709\u5b54\u866b\u306e\u5fae\u5c0f\u5316\u77f3\u306e\u540c\u4f4d\u4f53\u6bd4\u3092\u8abf\u3079\u308b\u3068\u6c34\u6e29\u304c\u308f\u304b\u308b
\n\u3068\u3044\u3046\u624b\u6cd5\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u7d0d\u5f97\u3067\u304d\u307e\u3059\u306d\u3002\u3044\u308d\u3044\u308d\u306a\u5834\u6240\u306e\u6d77\u6c34\u6e29\u304b\u3089\u5730\u8868\u5e73\u5747\u6e29\u5ea6\u306f\u51fa\u305b\u305d\u3046\u306a\u6c17\u304c\u3057\u307e\u3059\u3002\u6c17\u8c61\u30e2\u30c7\u30eb\u3092\u3064\u304b\u3046\u306e\u3067\u3057\u3087\u3046\u3002
\n\u3044\u305a\u308c\u306b\u3057\u3066\u3082\u30b8\u30e5\u30e9\u7d00\u5f8c\u671f\uff081\u5104\u5e74\u524d\uff09\u4ee5\u524d\u306e\u6d77\u5e95\u306f\u30d7\u30ec\u30fc\u30c8\u306e\u79fb\u52d5\u3067\u6c88\u307f\u8fbc\u3093\u3067\u3057\u307e\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u3053\u307e\u3067\u3057\u304b\u3055\u304b\u306e\u307c\u308c\u307e\u305b\u3093\u3002<\/p>\n
\u82f1\u8a9e\u306f\u3001https:\/\/en.wikipedia.org\/wiki\/Oxygen_isotope_ratio_cycle
\n“The 18O\/16O ratio provides a record of ancient water temperature. Water 10 to 15 \u00b0C (18 to 27 \u00b0F) cooler than present represents glaciation.\u3000… A plot of ancient water temperature over time indicates that climate has varied cyclically, with large cycles and harmonics, or smaller cycles, superimposed on the large ones. ”
\nglaciation \u6c37\u6cb3\u5f62\u6210
\nharmonics \u500d\u97f3\u3001\u6574\u6570\u5206\u306e\uff11\u306e\u5468\u671f
\nsuperimposed \u91cd\u7573\u3055\u308c\u308b\u3001\u91cd\u306a\u3063\u3066\u3044\u308b
\n\u201dLimestone is deposited from the calcite shells of microorganisms. Calcite, or calcium carbonate, chemical formula CaCO3, is formed from water, H2O, and carbon dioxide, CO2, dissolved in the water. The carbon dioxide provides two of the oxygen atoms in the calcite. The calcium must rob the third from the water. A higher abundance of 18O in calcite is indicative of colder water temperatures, since the lighter isotopes are all stored in the glacial ice. The microorganism most frequently referenced for identifying marine isotope stages is foraminifera.\u201d
\nlimestone \u77f3\u7070\u77f3
\ncalcite shells \u65b9\u89e3\u77f3\u306e\u8c9d\u6bbb
\nrob \u596a\u3046
\nforaminifera \u30d5\u30a9\u30e9\u30df\u300c\u30cb\u300d\u30d5\u30a7\u30e9 \u6709\u5b54\u866b\u3000\u3000\u30e9\u30c6\u30f3\u8a9e\u3067 foramin \u306f\u7a74\u3002
\n“Earth’s dynamic oxygenation evolution is recorded in ancient sediments from the Republic of Gabon from between about 2,150 and 2,080 million years ago. ”
\nevolution \u9032\u5316\u3001\u3067\u3059\u304c\u3001\u82f1\u8a9e\u3067\u306f\u751f\u7269\u306b\u9650\u3089\u306a\u3044\u611f\u3058\u3067\u3059\u3002
\nsediments \u5806\u7a4d\u7269<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6628\u65e5\u306e\u8a18\u8ff0\u306b\u8aa4\u308a\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u300c\u3061\u304d\u3085\u3046\u300d\u306e\u6398\u524a\u6df1\u5ea6\u306e\u8a18\u9332\u306f10km\u3067\u306f\u306a\u304f\u3066\u30012019\u5e74\u306e3262.5m\u3067\u3001\u79d1\u5b66\u6398\u524a\u3068\u3057\u3066\u4e16\u754c\u6700\u6df1\u3060\u305d\u3046\u3067\u3059\u3002\u65ad\u5c64\u3084\u8936\u66f2\u304c\u6fc0\u3057\u3044\u305f\u3081\u8a08\u753b\u3088\u308a\u3082\u6d45\u3044\u3068\u3053\u308d\u3067\u6398\u524a\u3092\u4e2d\u6b62\u3057\u305f\u3068\u306e\u3053\u3068\u3067\u3059\u3002\u5730\u9707\u306e\u9707\u6e90\u306b\u306a\u308a\u3046\u308b\u3068\u3053\u308d\u3092\u6398\u524a\u3057\u3066\u3044\u308b\u306e\u3067\u300c\u9670\u8b00\u8ad6\u300d\u306e\u6a19\u7684\u306b\u306a\u3063\u305f\u308a\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u3093\u306a\u306b\u67d4\uff08\u3084\u308f\uff09\u306a\u3082\u306e\u3067\u306f\u7121\u3044\u3067\u3057\u3087\u3046\u3002 https:\/\/www.jamstec.go.jp\/chikyu\/j\/nantroseize\/ \u3055\u3066\u3001\u53e4\u6c17\u5019\u3092\u6d77\u5e95\u5806\u7a4d\u7269\u3067\u8abf\u3079\u308b\u65b9\u6cd5\u3092\u3044\u304f\u3064\u304b\u898b\u3064\u3051\u307e\u3057\u305f\u3002\u4e00\u3064\u306f\u9178\u7d20\u540c\u4f4d\u4f53O-18\/O-16\u6bd4\u3067\u3059\u3002 https:\/\/nh.kanagawa-museum.j…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[48],"tags":[11],"class_list":["post-2219","post","type-post","status-publish","format-standard","hentry","category-spaceandearth","tag-spaceandearth"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=\/wp\/v2\/posts\/2219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2219"}],"version-history":[{"count":0,"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=\/wp\/v2\/posts\/2219\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sekaiken.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}