GEOCHEMICAL CHARACTERISTICS OF CARBONATE ROCK DIAGENESIS
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摘要: 作者以巢县地区震旦系到三叠系的碳酸盐岩为例,探讨了在不同成岩环境下,碳酸盐岩中微量元素Sr、Na、Fe、Mn的分布特征。主要经历了大气淡水成岩作用的灰岩(奥陶系、石炭系和州组上部、黄龙组、船山组)有较低的Sr(188×10-6)、Na(132×10-6)、Mn(149×10-6)含量;而以海底成岩作用为主的灰岩(石炭系金陵组、和州组下部、二叠系栖霞组、三叠系南陵湖组),则有较高的Sr(515×10-6)、Na(396×10-6)、Mn(404×10-6)值;与以准同生后成岩白云岩化作用为主的多成因白云岩(震旦-寒武系)相比,准同生的萨布哈白云岩(三叠系东马鞍山组)有稍高的Sr(138×10-6)、Na(806×10-6),而前者的Sr、Na含量分别为103×10-6、604×10-6.Mn的含量在两类白云岩中差异不明显。与灰岩相比,白云岩化作用将有较高的Na和较低的Sr、Mn.此外,Fe的含量与Ca+Mg含量呈负相关趋势明显,这表明了陆源物质对于Fe的干扰不容忽视。Abstract: The paper deals with the distribution of trace elements,such as Sr.Na,Fe.Mn in carbonate rocks occurred under various diagenetic environments with a case study of the carbonate rocks(Z-T)in the Chao County.The limestones(O,upper part of C1h.C2h.C2c)origined mainly from meteoric diagenesis are characterized by low concentrations of Sr(188ppm),Na(132ppm),Mn(149ppm),while the limestones(Clj,lower part of C1h.P1q,T1n)mainly derived from submarine diagenesis by high concentrations of Sr(515ppm),Na(396ppm),Mn(404ppm).The penecontemporaneous sabkha dolomites(T2d),in comparison with penecontemporaneous-back poly-origin dolomites(Z-∈)which origin mainly from diagenesis dolomitization,has high concentrations of Sr(138ppm),Na(806ppm),and the later have low concentrations of S(103ppm)and Na(604ppm).It is significant for the difference in Mn content between the dolomites.The dolomite rocks,in comparison with the limestones,have high Na and low Sr,Mn.Moreover,it is obvious that Fe content tends to be negative correlation with Ca+Mg content and it is suggested that Fe content should be influenced by terrigenous cleposits.
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[1] 罗宾·巴瑟斯特.碳酸盐沉积物及其成岩作用(中译本),北京:科学出版社,1977 [2] Pingitore Jr.N E The behaviour of Zn2+ and Mn2+ during carbonate diagenesis,theory and application.J.Sed.Petrol.,1978,48,799-814. [3] 王英华等.中、下扬子区海相碳酸盐岩成岩作用研究,北京:科学技术出版社,1991 [4] Land L S.Goreau T F.Submarine Lithification of Jamaican reefs,J.Std.Petrol.,1970 40,457-462 [5] Kinsman D J J.Interpretation of Sr2+ concentrations in carbonate minerals and rocks.J.Sed.Petrol.,1969.39:486-508 [6] Baker P A.and Burns S J.Occurrence and formation of dolomite in organic-rich continental margin sediments.Brell.Am.Ass.Petrol.Ceol.,1985,69.,1917-1930 [7] Tucker M E.and Wright V P.Carbonate sedimentology,Blackwell Scientific Publications.Orford Loxdon.1990.314-400 [8] Wallace M W.Origin of dolomitization on the Barbwire Terrace,Canning Basin,Western Australia,Sedixeextology.1990,37,105-122 [9] Erik Flugel.Microfacies analysis of limestone,Berlin,Springer-Verlag,1982 [10] Churnet H G.and Misra K C.Genetic implications of the trace element distribution pattern in the Upper Knox car-bonate rocks,Copper Ridge District,East Tennessee,Sediment.Gtol.,1981,30;173-194 [11] Cioni R.et al.Sr-distribution and carbonate mineralogy in the "Calcare Masiccio" formation of non一metamorphic Tuscan series.North of Auno River.Boll.Soc.Ctol.,1973.92,363-389 [12] Badiozamani K.The dorag dolomitization model-application to the Middle Ordovician of Wisconsin.J.Sedi-meat.Petrol..1973.43,965-984 [13] Bencini A.and Turi A.Mn distribution in the Mesozoic carbonate rocks from Lima Valley.northern Apennines.J.Sed.Petrod.,1974.44(3)0774 -782 [14] Land L S.and Hoops G K.Sodium in carbonate sediments and rocks:a possible index to the salinity of diagenetic solution.J.Sed.Petrol.,1973.43:614-617 -
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