Trace element characteristics of carbonate rocks from the Ediacaran Doushantuo Formation of Xikou section, Cili County, Hunan Province and its palaeoenvironmental significance
Wei Kai, Li Xubing, Liu An, Li Jitao, Bai Yunshan, Zhou Peng, Chen Xiaohong
Wuhan Insitute of Geology and Mineral Resources,Wuhan 430205,Hubei
Abstract Trace element and rare earth element(REE)of 64 carbonate rock samples from the Ediacaran Doushantuo Formation of Xikou section,Cili County,Hunan Province are analyzed. Palaeoredox indicated by the combination of U/Th,Ce anomalies and Ca/Mg is in accordance with that by sequence stratigraphic studies,suggesting that the three proxies in carbonates are applicable in reconstructing palaeoredox environment of the Ediacaran. In the bottom and middle of Doushantuo Formation,the REE distributional pattern changes from typical fresh water to typical sea water,probably indicating the injecting of deglacial meltwater and thus being replaced by normal sea water during the post-Marinoan and post-Gaskier period. The strong Eu anomalies,relatively higher Eu value as well as the seismites discovered in Xikou section by previous research may suggest that the hydrothermal activity probably occurs during the whole Doushantuo Age,being strong in the early and then weakened in the late stage. The hydrothermal activity may be of great significance to the appearance and the bloom of Ediacaran biota because of the important phosphorus supply.
About author: Wei Kai,born in 1983,is a research assistant with a Ph.D. degree in Wuhan Institute of Geology and Mineral Resources. He is currently engaged in sedimentary geochemistry. Address:Guanggu Road 69,East Lake High-tech Development District,Wuhan430205,Hubei Province. E-mail: kaiwei1983@163.com.
Cite this article:
Wei Kai,Li Xubing,Liu An et al. Trace element characteristics of carbonate rocks from the Ediacaran Doushantuo Formation of Xikou section, Cili County, Hunan Province and its palaeoenvironmental significance[J]. JOPC, 2015, 17(3): 297-308.
Wei Kai,Li Xubing,Liu An et al. Trace element characteristics of carbonate rocks from the Ediacaran Doushantuo Formation of Xikou section, Cili County, Hunan Province and its palaeoenvironmental significance[J]. JOPC, 2015, 17(3): 297-308.
常华进,储雪蕾,冯连君,等. 2009. 氧化还原敏感元素对古海洋沉积环境的指示意义[J]. 地质论评,55(1):91-99. 杜远生,朱杰,顾松竹,等. 2007. 北祁连造山带寒武系—奥陶系硅质岩沉积地球化学特征及其对多岛洋的启示[J]. 中国科学(D辑),37(10):1314-1329. 冯洪真,Bernd-D Erdtmann,王海峰. 2000. 上扬子早古生代全岩Ce异常与海平面长缓变化[J]. 中国科学(D辑),30(1):66-72. 郭庆军,杨卫东,刘丛强,等. 2003. 贵州瓮安生物群和磷矿形成的沉积地球化学研究[J]. 矿物岩石地球化学通报,22(3):202-208. 黄晶,储雪蕾,常华,等. 2009. 三峡地区埃迪卡拉系陡山沱组帽碳酸盐岩的微量元素和稀土元素研究[J]. 科学通报,54(22):3498-3506. 李旭兵,赵灿,刘安,等. 2013. 雪峰山西侧地区陡山沱组层序地层划分及沉积体系展布[J]. 地层学杂志,37(4):527-533. 王立社,侯俊富,张复新,等. 2010. 北秦岭庙湾组黑色岩系稀土元素地球化学特征及成因意义[J]. 地球学报,31(1):73-82. 王约,楚靖岩,王训练. 2009. 华南震旦系陡山沱组磷质震积岩及其与多细胞生物群相关性初探[J]. 地质论评,55(5):620-627. 夏文杰,杜森官,徐新煌,等. 1994. 中国南方震旦纪岩相古地理与成矿作用[M]. 北京:地质出版社,50-62. 严德天,陈代钊,王清晨,等. 2009. 扬子地区奥陶系—志留系界线附近地球化学研究[J]. 中国科学(D辑),39(3):285-299. 赵灿,李旭兵,李志宏,等. 2012. 湖南慈利溪口震旦系陡山沱组震积岩的发现及其地质意义[J]. 沉积学报,30(6):1032-1041. Algeo T J. 2004. Can marine anoxic events draw down the trace element inventory of seawater？[J]. Geology,32:1057-1060. Dolenec M. 2005. The Permian-Traissic Boundary in the Karavanke Mountains(Brsnina section,Solenia):The ratio of Th/U as a possible indicator of changing redox conditions at the P/T transition[J]. RMZ-Materials and the Geoenvironment,52(2):437-445. Dolenec T,Lojen S,Ramovs A. 2001. The Permian-Triassic boundary in Western Slovenia(Idrijca Valley section):Magnetostratigraphy,stable isotopes,and elemental variations[J]. Chemical Geology,175(1-2):175-190. Douville E,Bienvenu P,Charlou J L, et al. 1999. Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems[J]. Geochimica et Cosmochimica Acta,63:627. Font E,Nedelec A,Trindade R I F, et al. 2006. Chemostratigraphy of the Neoproterozoic Mirassol d‘Oeste cap dolostones(Mato Grosso,Brazil):An alternative model for Marinoan cap dolostone formation[J]. Earth and Planetary Science Letters,250(1-2):89-103. Frimmel H E. 2009. Trace element distribution in Neoproterozoic carbonates as palaeoenvironmental indicator[J]. Chemical Geology,258:338-353. García M G,Lecomte K L,Pasquini A I, et al. 2007. Sources of dissolved REE in mountainous streams draining granitic rocks,Sierras Pampeanas(Córdoba,Argentina)[J]. Geochimica et Cosmochimica Acta,71:5355-5368. Goldstein S J,Jacobsen S B. 1988. Rare-earth elements in river waters[J]. Earth and Planetary Science Letters,89:35-47. Guo Q J,Shields G A,Liu C Q. 2007. Trace element chemostratigraphy of two Ediacaran-Cambrian successions in South China:Implications for organosedimentary metal enrichment and silicification in the early Cambrian[J]. Palaeogeography,Palaeoclimatology,Palaeoecology,254:194-216. Hurtgen M T,Halverson G P,Arthur M A, et al. 2006. Sulfur cycling in the aftermath of a 635-Ma snowball glaciation:Evidence for a syn-glacial sulfidic deep ocean[J]. Earth and Planetary Science Letters,245:551-570. Jiang G Q,Kennedy M J,Christie-Blick N, et al. 2006. Stratigraphy,sedimentary structures,and textures of the late Neoproterozoic Doushantuo cap carbonate in south China[J]. Journal of Sediment Research,76:978-995. Jones B J,Manning A C. 1994. Comparison of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstones[J]. Chemical Geology,111:111-129. Lawrence M G,Greig A,Collerson K D, et al. 2006. Rare earth element and yttrium variability in South East Queensland waterways[J]. Aquatic Geochemistry,12:39-72. Lyons T W,Werne J P,Hollander D J, et al. 2003. Contrasting sulfur geochemistry and Fe/Al and Mo/Al ratios across the last oxic-to-anoxic transition in the Cariaco Basin,Venezuela[J]. Chemical Geology,195:131-157. Meyera E E,Quicksallb A N,Landisa J D, et al. 2012. Trace and rare earth elemental investigation of a Sturtian cap carbonate,Pocatello,Idaho:Evidence for ocean redox conditions before and during carbonate deposition[J]. Precambrian Research,192-195:89-106. Murray R W,Buchholtz Ten Brink M R,Gerlach D C,et al. 1991. Rare earth,major,and trace elements in chert from the Franciscan Complex and Monterey Group,California:Assessing REE sources to fine-grained marine sediments[J]. Geochimica et Cosmochimica Acta,55:1875-1895. Nothdurft L D,Webb G E,Kamber B S. 2004. Rare earth element geochemistry of Late Devonian reefal carbonates,Canning Basin,Western Australia:Confirmation of a seawater REE proxy in ancient limestones[J]. Geochim Cosmochim Acta,68:263-283. Nozaki Y,Alibo D S. 2003. Importance of vertical geochemical processes in controlling the oceanic profiles of dissolved rare earth elements in the northeastern Indian Ocean[J]. Earth and Planetary Science Letters,205:155-172. Owen A W,Armstrong H A,Floyd J D. 1999. Rare earth element geochemistry of upper Ordovician cherts from the Southern Upland of Scotland[J]. Journal of the Geological Society of London,156:191-204. Rimmer S M. 2004. Geochemical paleoredox indicators in Devonian-Mississippian black shales,Central Appalachian Basin(USA)[J]. Chemical Geology,206:373-391. Sarkar A,Sarangi S,Ebihara A, et al. 2003. Carbonate geochemistry across the eocene/oligocene boundary of Kutch,western India:Implications to oceanic O2-poor condition and foraminiferal extinction[J]. Chemical Geology,201(3-4):281-293. Schroeder S,Grotzinger J P. 2007. Evidence for anoxia at the Ediacaran-Cambrian boundary: The record of redox-sensitive trace elements and rare earth elements in Oman[J]. Journal of the Geological Society of London,164(1):175-187. Shen B,Xiao S H,Kaufman A J, et al. 2008. Stratification and mixing of a post-glacial Neoproterozoic ocean:Evidence from carbon and sulfur isotopes in a cap dolostone from northwest China[J]. Earth and Planetary Science Letters,265:209-228. Shen Y N,Zhang T G,Hoffman P F. 2008. On the coevolution of Ediacaran oceans and animals[J]. Proceedings of National Academy of Sciences of the United States of America,105(21):7376-7381. Spangenberg J E,Bagnoud-Velsquez M,Boggiani P C, et al. 2013. Redox variations and bioproductivity in the Ediacaran:Evidence from inorganic and organic geochemistry of the Corumb Group,Brazil[J]. Gondwana Research,http:∥dx.doi.org/10.1016/j.gr.2013.08.014. Taylor S R,McClennan S M. 1985. The Continental Crustal:Its Composition and Evolution[M]. Oxford:Blackwell,312. Tribovillard N,Desprairies A,Lallier-Vergès E, et al. 2006. Geochemical study of organic-rich cycles from the Kimmeridge Clay Formation of Yorkshire(G B): Productivity vs. anoxia[J]. Palaeogeography,Palaeoclimatology,Palaeoecology,108:165-181. Wright J,Schrader H,Holser W T. 1987. Paleoredox variations in ancient oceans recorded by rare earth elements in fossil apatite[J]. Geochimica et Cosmochimica Acta,51:631-644. Zhao Y Y,Zheng Y F,Chen F K. 2009. Trace element and strontium isotope constraints on sedimentary environment of Ediacaran carbonates in southern Anhui,South China[J]. Chemical Geology,265:345-362. Zhou C M,Xiao S H. 2007. Ediacaran δ13C chemostratigraphy of South China[J]. Chemical Geology,237:89-108.
