安徽宿州寒武纪猴家山组灰岩微量元素地球化学特征
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摘要
为研究寒武纪猴家山组石灰岩地球化学特征及地质背景,对宿州地区寒武纪猴家山组石灰岩进行系统的岩石学和微量元素地球化学测试,分析灰岩中微量元素的来源及其特征,探讨古海水及古气候条件,反演灰岩形成的海水稀土配分模式。研究结果表明:猴家山组石灰岩元素U,Pb,Sr富集,Nb,Pr,Zr,Hf明显亏损;稀土总量偏低(2.19×10-6～9.95×10-6),轻稀土略亏损,NdSN/YbSN值在0.35～1.28变化,轻重稀土分异微弱,石灰岩样品均具有程度不同的La正异常、Ce负异常和Y正异常;Mo,V等元素指示了氧化程度较高的水体环境,Sr/Ba,Sr/Cu反映了盐度较大的海洋环境和干旱的气候条件;猴家山组灰岩反演海水稀土特征与新元古代海水略有差异,与正常海水稀土组成特征一致。
Petrological and trace elemental analysis were carried out for understanding the geochemical characteristics of limestone from Cambrian(Houjiashan Formation) and its geological background in Suzhou area.The origin of trace element and its characteristics in limestone were studied,the ancient seawater and paleoclimate analyzed,and the rare earth elemental distribution patterns of seawater discussed respectively.It was showed that the limestone was rich in U,Pb,Sr,poor in Nb,Pr,Zr,Hf.REE in limestone were characterized by lower total REE(1.63×10-6～7.79×10-6),light LREE depletion(NdSN/YbSN=0.35～1.28),slight fractionation between LREE and HREE,and various degree in negative Ce anomaly,positive La and Y anomaly.It also revealed that the ancient seawater was well oxygenated with high salinity,and the paleoclimate was drought evidenced by analytical data of Mo,V,Sr/Ba and Sr/Cu,respectively.The inversion of seawater from Houjiashan limestone conformed that it had a slight difference to seawater of Neoproterozoic,and in accordance to the rare earth element characters of normal sea water.
Petrological and trace elemental analysis were carried out for understanding the geochemical characteristics of limestone from Cambrian(Houjiashan Formation) and its geological background in Suzhou area.The origin of trace element and its characteristics in limestone were studied,the ancient seawater and paleoclimate analyzed,and the rare earth elemental distribution patterns of seawater discussed respectively.It was showed that the limestone was rich in U,Pb,Sr,poor in Nb,Pr,Zr,Hf.REE in limestone were characterized by lower total REE(1.63×10-6～7.79×10-6),light LREE depletion(NdSN/YbSN=0.35～1.28),slight fractionation between LREE and HREE,and various degree in negative Ce anomaly,positive La and Y anomaly.It also revealed that the ancient seawater was well oxygenated with high salinity,and the paleoclimate was drought evidenced by analytical data of Mo,V,Sr/Ba and Sr/Cu,respectively.The inversion of seawater from Houjiashan limestone conformed that it had a slight difference to seawater of Neoproterozoic,and in accordance to the rare earth element characters of normal sea water.
引文
[1]乔秀夫,高林志.华北中新元古代及早古生代地震灾变事件及与Rodinia的关系[J].科学通报,1999,44(16):1753-1757.
[2]安徽省地质矿产局.安徽省区域地质志[M].北京:地质出版社,1987,517-518.
[3]Taylor S R,McLennan S M.The Continental Crust:Its Composition and Evolution.Blackwell,1985,Oxford,312.
[4]王旭,沈建伟,陈代钊,等.塔里木盆地柯坪—巴楚地区早古生代白云岩类型及微量元素地球化学特征[J].矿物岩石,2011,31(2):23-32.
[5]Gromet L P,Dymek R F,Haskin L A,et al.The"North American Shale Composite":its compilation,major and trace element characteris-tics[J].Geochimica et Cosmochimica Acta,1984,48:2 469-2 482.
[6]田正隆,戴英,龙爱民,等.南沙群岛海域沉积物稀土元素地球化学研究[J].热带海洋学报,2005,24(1):8-14.
[7]Ramasamy N,Jayagopal M,John S,et al.Geochemistry of Neoproterozoic limestones of the Shahabad Formation,Bhima Basin,Karnata-ka,southern India[J].Geosciences Journal,2011,15(1):9-25.
[8]Challands T J,Armstrong H A,Maloney D P,et al.Organic-carbon deposition and coastal upwlling at mid-latitude during the Upper Or-dovician(Late Katian):A case study from the welsh Basin,UK[J].Palaeogeogr Palaeoclimatol Palaeoecol,2009,273(3/4):395-410.
[9]Vorlicek T P,Helz G R.Catalysis by mineral surfaces:Implication for Mo geochemistry in anoxic environments[J].Geochim CosmochimActa,2002,66(21):3 679-3 692.
[10]Piper D Z.Seawater as the source of minor elements in black shales,phosphorites,and other sedimentary rocks[J].Chem Geol,1994,114(1/2):95-114.
[11]Turekian K K,Wedepohl K H.Distribution of the elements in some major units of the Earth′s Crust[J].GSA Bull,1961,72(2):175-192.
[12]Calvert S E,Pedersen T F.Geochemistry of recent oxic and anoxic sediments:Implications for the geological record[J].Mar Geol,1993,113:67-88.
[13]Dill H.Metallogenesis of early Paleozoic graptolite shales from the Graefenthal Horst(Northern Bavaria-Federal Republic of Germany)[J].Econ Geol,1986,81(4):889-903.
[14]倪善芹,侯泉林,王安建,等.碳酸盐岩中锶元素地球化学特征及其指示意义[J].地质学报,2010,84(10):1510-1516.
[15]Bellanca A,Masetti D,Neri R.Rare earth elements in limestone/marlstone couplets from the Albian-Cenomanian Cismon section(Venetianregion,northern Italy):assessing REE sensitivity to environmental changes[J].Chemical Geology,1997,141,141-152.
[16]Nothdurft L D,Webb G E,Kamber B S.Rare earth element geochemistry of Late Devonian reefal carbonates,Canning Basin,WesternAustralia:confirmation of a seawater REE proxy in ancient limestones[J].Geochimica et Cosmochimica Acta,2004,68:263-283.
[17]刘士林,刘蕴华,林舸,等.渤海湾盆地南堡凹陷新近系泥岩稀土元素地球化学特征及其地质意义[J].现代地质,2006,20(3):449-456.
[18]张志斌,李忠权,李朝阳,等.中天山下石炭统马鞍桥组重结晶灰岩热水沉积成因的地球化学初步分析[J].矿物岩石,2007,27(2):70-77.
[19]Kato Y,Ohta I,Sunematsu T,et al.Rare earth element variations in mid-Archean banded iron formations:implications for the chemistryof ocean and continent and plate tectonics[J].Geochimica et Cosmochim Acta,1998,62(2):3 475-3 497.
[20]Bau M,Koschinsky A,Dulski,et al.Comparison of partitioning behaviors of yttrium,rare earth elements,and titanium between hydroge-netic marine ferromanganese crusts and seawater[J].Geochimica et Cosmochimica Acta,1996,60:1 709-1 725.
[21]Tanaka K,Miura N,Asahar Y,et al.Rare earth element and strontium isotopic study of seamount-type limestone in Mesozoic accretionarycomplex of Southern Chichibu Terrane,central Japan:implication for incorporation process of seawater REE into limestones[J].Geochem-ical Journal,2003,37:163-180.
[22]Zhong S,Mucci A.Partitioning of rare earth elements(REEs)between calcite and seawater solutions at 25℃and 1atm,and high dis-solved REE concentrations[J].Geochimica et Cosmochimica Acta,1995,59(3):443-453.
[23]陈松,桂和荣,孙林华,等.皖北九顶山组灰岩稀土元素地球化学特征及对古海水的制约[J].中国地质,2011,38(3):664-672.
[2]安徽省地质矿产局.安徽省区域地质志[M].北京:地质出版社,1987,517-518.
[3]Taylor S R,McLennan S M.The Continental Crust:Its Composition and Evolution.Blackwell,1985,Oxford,312.
[4]王旭,沈建伟,陈代钊,等.塔里木盆地柯坪—巴楚地区早古生代白云岩类型及微量元素地球化学特征[J].矿物岩石,2011,31(2):23-32.
[5]Gromet L P,Dymek R F,Haskin L A,et al.The"North American Shale Composite":its compilation,major and trace element characteris-tics[J].Geochimica et Cosmochimica Acta,1984,48:2 469-2 482.
[6]田正隆,戴英,龙爱民,等.南沙群岛海域沉积物稀土元素地球化学研究[J].热带海洋学报,2005,24(1):8-14.
[7]Ramasamy N,Jayagopal M,John S,et al.Geochemistry of Neoproterozoic limestones of the Shahabad Formation,Bhima Basin,Karnata-ka,southern India[J].Geosciences Journal,2011,15(1):9-25.
[8]Challands T J,Armstrong H A,Maloney D P,et al.Organic-carbon deposition and coastal upwlling at mid-latitude during the Upper Or-dovician(Late Katian):A case study from the welsh Basin,UK[J].Palaeogeogr Palaeoclimatol Palaeoecol,2009,273(3/4):395-410.
[9]Vorlicek T P,Helz G R.Catalysis by mineral surfaces:Implication for Mo geochemistry in anoxic environments[J].Geochim CosmochimActa,2002,66(21):3 679-3 692.
[10]Piper D Z.Seawater as the source of minor elements in black shales,phosphorites,and other sedimentary rocks[J].Chem Geol,1994,114(1/2):95-114.
[11]Turekian K K,Wedepohl K H.Distribution of the elements in some major units of the Earth′s Crust[J].GSA Bull,1961,72(2):175-192.
[12]Calvert S E,Pedersen T F.Geochemistry of recent oxic and anoxic sediments:Implications for the geological record[J].Mar Geol,1993,113:67-88.
[13]Dill H.Metallogenesis of early Paleozoic graptolite shales from the Graefenthal Horst(Northern Bavaria-Federal Republic of Germany)[J].Econ Geol,1986,81(4):889-903.
[14]倪善芹,侯泉林,王安建,等.碳酸盐岩中锶元素地球化学特征及其指示意义[J].地质学报,2010,84(10):1510-1516.
[15]Bellanca A,Masetti D,Neri R.Rare earth elements in limestone/marlstone couplets from the Albian-Cenomanian Cismon section(Venetianregion,northern Italy):assessing REE sensitivity to environmental changes[J].Chemical Geology,1997,141,141-152.
[16]Nothdurft L D,Webb G E,Kamber B S.Rare earth element geochemistry of Late Devonian reefal carbonates,Canning Basin,WesternAustralia:confirmation of a seawater REE proxy in ancient limestones[J].Geochimica et Cosmochimica Acta,2004,68:263-283.
[17]刘士林,刘蕴华,林舸,等.渤海湾盆地南堡凹陷新近系泥岩稀土元素地球化学特征及其地质意义[J].现代地质,2006,20(3):449-456.
[18]张志斌,李忠权,李朝阳,等.中天山下石炭统马鞍桥组重结晶灰岩热水沉积成因的地球化学初步分析[J].矿物岩石,2007,27(2):70-77.
[19]Kato Y,Ohta I,Sunematsu T,et al.Rare earth element variations in mid-Archean banded iron formations:implications for the chemistryof ocean and continent and plate tectonics[J].Geochimica et Cosmochim Acta,1998,62(2):3 475-3 497.
[20]Bau M,Koschinsky A,Dulski,et al.Comparison of partitioning behaviors of yttrium,rare earth elements,and titanium between hydroge-netic marine ferromanganese crusts and seawater[J].Geochimica et Cosmochimica Acta,1996,60:1 709-1 725.
[21]Tanaka K,Miura N,Asahar Y,et al.Rare earth element and strontium isotopic study of seamount-type limestone in Mesozoic accretionarycomplex of Southern Chichibu Terrane,central Japan:implication for incorporation process of seawater REE into limestones[J].Geochem-ical Journal,2003,37:163-180.
[22]Zhong S,Mucci A.Partitioning of rare earth elements(REEs)between calcite and seawater solutions at 25℃and 1atm,and high dis-solved REE concentrations[J].Geochimica et Cosmochimica Acta,1995,59(3):443-453.
[23]陈松,桂和荣,孙林华,等.皖北九顶山组灰岩稀土元素地球化学特征及对古海水的制约[J].中国地质,2011,38(3):664-672.
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