淮安盐盆东南部中生界白垩系石盐矿物中Br~-离子化学特征及其指示意义
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摘要
目前对淮安盐盆中生界白垩系石盐沉积物质来源是陆相成因还是海相成因尚存在争议。通过对淮安盐盆东南部石盐矿物中Br~-离子含量及溴氯系数进行研究,结果表明:区内石盐矿物中Br~-离子含量介于3×10~(-6)~42×10~(-6),说明淮安盐盆东南部石盐矿在不同阶段矿物结晶时,卤水中Br~-离子浓度普遍较低,结合区内孢粉组合、化石组合特征,认为具有陆相成因特征;其溴氯系数介于0.008~0.139,其中低于海相成因最初沉积阶段溴氯系数0.11的占90.7%,说明淮安盐盆盐类物质来源主要来自陆相成因的地表岩石风化淋滤或地下深层卤水。
At present,Mesozoic Cretaceous′Halite sedimentary source in the southeast of Huai'an basin still has a dispute about continental origin or marine origin.This paper studied Br-content characteristics and Br~- & Cl-′coefficient in the halite of Huai'an salt basin.The result showed that the Br-concentration ranged from 3×10~(-6) to 42×10~(-6),which indicates that the Br-ion concentration was generally lower in different stages of halitemineral crystallization.Combined with palynological assemblage and fossil assemblage characteristics in Huai'an salt basin,we concluded that the Halite ore deposit had the features of continental origin.Br-&Cl-coefficient ranged from 0.008 to 0.139,and 90.7% of the statistical data were below Br~-&Cl-′coefficient 0.11 of the initial stage of deposition of marine origin.All these figures illustrated the source of salt in Huai'an basin came from the rock of the earth's surface weathering and leaching or deep underground brine.
At present,Mesozoic Cretaceous′Halite sedimentary source in the southeast of Huai'an basin still has a dispute about continental origin or marine origin.This paper studied Br-content characteristics and Br~- & Cl-′coefficient in the halite of Huai'an salt basin.The result showed that the Br-concentration ranged from 3×10~(-6) to 42×10~(-6),which indicates that the Br-ion concentration was generally lower in different stages of halitemineral crystallization.Combined with palynological assemblage and fossil assemblage characteristics in Huai'an salt basin,we concluded that the Halite ore deposit had the features of continental origin.Br-&Cl-coefficient ranged from 0.008 to 0.139,and 90.7% of the statistical data were below Br~-&Cl-′coefficient 0.11 of the initial stage of deposition of marine origin.All these figures illustrated the source of salt in Huai'an basin came from the rock of the earth's surface weathering and leaching or deep underground brine.
引文
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[2]张建,龚耀冲,高雨根.淮安盐盆张兴块段石盐矿床成因及含盐系韵律特征[J].中国井矿盐,2010,41(2):21-23.
[3]龚与觐,孔庆玉.苏北淮安凹陷白垩系浦口组成盐条件的讨论[J].石油实验地质,1989,11(2):136-143.
[4]舒福明.洪泽凹陷赵集次凹阜宁组四段盐岩沉积特征及成因[J].安徽地质,2004,14(2):81-85.
[5]赵彦彦,林春明,汪亚军,等.苏北淮阴凹陷上白垩统浦口组盐岩成因探讨[J].高校地质学报,2004,10(3):468-476.
[6]冯晓杰,渠永宏,王洪江.中国东部早第三纪海侵问题的研究[J].西安工程学院学报,1999,21(3):9-12.
[7]李钟模,江宗龙.试论我国东部早第三纪沉积盆地的海水通道[C]//中国古生物学会第十三、十四届学术年会论文选集.合肥:安徽科技出版社,1986:261-270.
[8]吴必豪,祁佐明,王弭力,等.湖北Q盆地含盐系地球化学的研究[J].地质学报,1980(4):324-334.
[9]林耀庭.溴的地球化学习性及其在四川找钾工作中的应用[J].化工矿产地质,1995,17(3):175-181.
[10]孟凡巍,倪培,严贤勤,等.江苏金坛盐矿形成时期盐湖水体成分:来自石盐包裹体的证据[J].微体古生物学报,2011,28(3):324-328.
[11]王巍,陈高,王家林,等.苏北-黄海海盆地地区构造特征分析[J].地震学刊,1999,19(1):47-45.
[12]HAQ B U,HARDENBOL J,VAIL P R.Chronology of fluctuating sea levels since the Triassic[J].Science,1987,235(4793):1156-1167.
[13]傅强,李益,张国栋,等.苏北盆地晚白垩世-古新世海侵湖泊的证据及其地质意义[J].沉积学报,2007,25(3):380-385.
[14]岳文浙,丁保良.江苏白垩纪陆相层序地层研究[J].资源调查与环境,1999(4):287-344.
[15]牟荣.盐阜坳陷淮阴凹陷上白垩统浦口组沉积构造[J].新疆石油地质,2006,27(6):691-695.
[16]王伟锋,张美.洪泽凹陷赵集次凹阜宁组四段盐岩深水再沉积成因探讨[J].沉积学报,2015,33(2):242-253.
[17]杨学英,周山富.江苏淮安地区上白垩统含盐地层孢粉组合序列[J].地层学杂志,2002,26(3):193-196.
[18]宋之琛,郑亚惠,刘金陵,等.江苏地区白垩纪-第三纪孢粉组合[M].北京:地质出版社,1981.
[19]程怀德,马海洲,谭红兵,等.钾盐矿床中Br的地球化学特征及研究进展[J].矿物岩石地球化学通报,2008,27(4):399-408.
[20]程怀德,马海州.显生宙以来海水组分变化对海相钾盐蒸发岩的制约作用[J].矿物岩石地球化学通报,2013,32(5):609-618.
[21]侯祐堂,陈德琼,杨恒仁,等.江苏地区白垩纪-第四纪介形类动物群[M].北京:地质出版社,1982.