{"refrec":{"BRefID":139370,"RR":"<b>Grant Gross, M.</b> (1964). Variations in the O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios of diagenetically altered limestones in the Bermuda Islands. <i>J. Geol. 72(2)</i>: 170-194","BEntID":132949,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>J. Geol. 72(2)</i>: 170-194","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Grant Gross, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Grant Gross, M.","Englishabstract":"Marine and eolian Pleistocene sediments in the Bermuda Islands are composed largely of fragments of mollusks, Foraminifera, lithothamnoid algae, and <i>Halimeda</i>. The Pleistocene sediments range from unconsolidated carbonate sands to well-consolidated limestones. Recent carbonate sediments and major sediment-contributing organisms (except <i>Halimeda</i>) have similar O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios which are distinctly different from the O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios observed in the stalactites, soil bases, and secondary calcites from the limestones. Precipitation of secondary calcite in the limestones and alteration of the constituent grains cause the O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios of the limestones to approach the values observed in stalactites and soil bases. Secondary calcites, precipitated from fresh water on the Bermuda Islands, have O<sup>18</sup>/O<sup>16</sup> ratios which are controlled primarily by the average O<sup>18</sup>/O<sup>16</sup> ratio of the rain water on the island. The C<sup>13</sup>/C<sup>12</sup> ratios of the secondary calcites are controlled by the amount of carbon dioxide derived from the soil zone which is mixed with carbon derived from solution of the limestones through which the water has passed. Some of the limestones from the intertidal or surf-spray zone have O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios which are distinctly different from the majority of the well-consolidated limestones. These limestones may have been lithified by cement precipitated from sea water or from fresh water which had been subjected to evaporation and to exchange of carbon with atmospheric carbon dioxide.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Variations in the O<sup>18</sup>/O<sup>16</sup> and C<sup>13</sup>/C<sup>12</sup> ratios of diagenetically altered limestones in the Bermuda Islands","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1964,"MonPub":null,"DateUpdate":"2014-07-04","DateCreate":"2009-07-09","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":139370,"PubliDate":1964,"Pagination":"170-194","XtraPublOfAnaID":null,"ISBN":null,"Volume":"72","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43059,"SerRR":"The Journal of Geology. University of Chicago Press: Chicago,.  ISSN 0022-1376; e-ISSN 1537-5269","StandardTitleSer":"The Journal of Geology","ISSN":"0022-1376","AbbrevSer":"J. 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