贵州下寒武统黑色页岩稀土元素组成及示踪特征研究
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摘要
通过对贵州省织金、凤冈、开阳、天马、天星、大方等地下寒武统牛蹄塘组以及大方下志留统下部龙马溪组进行化学分析,研究常微量元素特征和稀土元素组成及示踪特征,结果表明,研究区黑色页岩化学成分以SiO_2为主,其次为Al_2O_3、Fe_2O_3和K_2O;微量元素中As、Mo、Pb、W等富集最为明显,以Mo、Pb、Co等含量最高。V/Cr、Ni/Co等比值表明黑色页岩多形成于贫-缺氧沉积环境,局部存在弱氧化条件;稀土元素属轻稀土富集、重稀土相对亏损型。研究区黑色页岩形成于大陆边缘区还原海水沉积并伴有热水沉积参与的环境,物质来源受陆源和幔源、深部物质加入控制。
Through chemical analysis of black shale of the Early Cambrian Niutitang Formation and the Lower Silurian Longmaxi Formation in Zhijin, Fenggang, Kaiyang, Tianma, Tianxing and Dafang, Guizhou province, the characteristics of the main and trace elements and the composition of rare earth elements were studied. It is concluded that the chemical composition of black shale in the study area is mainly SiO_2, followed by Al_2O_3, Fe_2O_3 and K_2O; As, Mo, Pb, W are most enriched in trace elements, the contents of Mo, Pb, Co are the highest. The V/Cr and Ni/Co ratios show that black shales were mostly formed in poor-anoxic sedimentary environments and oxidized locally. Rare earth elements are light rare earth enriched and heavy rare earth relatively depleted. The black shale was formed in a reductive seawater sedimentary environment along the continental margin with the participation of hydrothermal sedimentation. The substance sources were controlled by the addition of terrestrial, mantle-derived and deep-seated materials.
Through chemical analysis of black shale of the Early Cambrian Niutitang Formation and the Lower Silurian Longmaxi Formation in Zhijin, Fenggang, Kaiyang, Tianma, Tianxing and Dafang, Guizhou province, the characteristics of the main and trace elements and the composition of rare earth elements were studied. It is concluded that the chemical composition of black shale in the study area is mainly SiO_2, followed by Al_2O_3, Fe_2O_3 and K_2O; As, Mo, Pb, W are most enriched in trace elements, the contents of Mo, Pb, Co are the highest. The V/Cr and Ni/Co ratios show that black shales were mostly formed in poor-anoxic sedimentary environments and oxidized locally. Rare earth elements are light rare earth enriched and heavy rare earth relatively depleted. The black shale was formed in a reductive seawater sedimentary environment along the continental margin with the participation of hydrothermal sedimentation. The substance sources were controlled by the addition of terrestrial, mantle-derived and deep-seated materials.
引文
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[2] 张杰,孙传敏,杨国峰,谢飞.贵州下寒武统黑色页岩稀土元素地球化学特征[J].稀土,2008(2):72-75.Zhang J,Sun C M,Yang G F,Xie F.Geochemical characteristics of REE in black shale of lower cambrian series of guizhou[J].Chinese Rare Earths,2008(2):72-75.
[3] 刘宝珺,许效松,潘杏南,黄慧琼,徐强.中国南方古大陆沉积地壳演化与成矿[M].北京:科学出版社,1993.Liu B J,Xu X S,Pan X N,et al.Sedimentary Evolution and Metallogenesis of the Paleo Continent in Southern China[M].Beijing:Science Press,1993.
[4] 贾智彬,侯读杰,孙德强,姜玉涵,赵喆,张自鸣,洪梅,畅哲,董立成.热水沉积区黑色页岩稀土元素特征及其地质意义——以贵州中部和东部地区下寒武统牛蹄塘组页岩为例[J].天然气工业,2018,38(5):44-51.Jia Z B,Hou D J,Sun D Q,Jiang Y H,Zhao Z,Zhang Z m,Hong M,Chang Z,Dong L C.Characteristics and geological implications of rare earth elements in black shale in hydrothermal sedimentation areas:A case study from the Lower Cambrian Niutitang Fm shale in central and eastern Guizhou[J].Natural Gas Industry,2018,38(5):44-51.
[5] 苏慧敏,杨瑞东,高军波,徐世林,张泽.贵州惠水早石炭世打屋坝组黑色岩系稀土元素地球化学特征及沉积环境分析[J].中国稀土学报,2017,35(5):620-631.Su H M,Yang R D,Gao J B,Xu S L,Zhang Z.REE geochemical signatures and sedimentary environments of the Early Carboniferous Dawuba formation black rock Series in Huishui,Guizhou[J].Journal of the Chinese Society of Rare Earths,2017,35(5):620-631.
[6] 毛瑞勇,张杰,冷济高,李鹏,王沙.岑巩页岩气区块牛蹄塘组黑色页岩稀土元素地球化学特征及沉积环境分析[J].矿物岩石,2016,36(4):66-73.Mao R Y,Zhang J,Leng J G,Li P,Wang S.Geochemical characteristics of rare earth elements and depositional environments of the Niutitang formation black shale in Cen’gong shale gas block[J].Journal of Mineralogy and Petrology,2016,36(4):66-73.
[7] 闫德宇,黄文辉,王婷灏,刘贝.中、下扬子地区下寒武统黑色页岩微量元素富集特征[J].地学前缘,2016,23(3):42-50.Yan D Y,Huang W H,Wang T H,Liu B.Trace element characteristics of the Lower Cambrian black shales in middle and Lower Yangtze area,China[J].Earth Science Frontiers,2016,23(3):42-50.
[8] 侯东壮,吴湘滨,刘江龙,吴德华,葛丽萍.黔东南州下寒武统黑色页岩稀土元素地球化学特征[J].中国有色金属学报,2012,22(2):546-552.Hou D Z,Wu X B,Liu J L,Wu D H,Ge L P.Geochemical characteristics of rare earth elements in Lower Cambrian black shale in Southeast Qian[J].The Chinese Journal of Nonferrous Metals,2012,22(2):546-552.
[9] 徐文礼,郑荣才,颜雪,文华国,崔璀.下扬子地区早古生代黑色岩系地球化学特征及其地质意义[J].吉林大学学报:地球科学版,2014,44(4):1108-1122.Xu W L,Zheng R C,Yan X,Wen H G,Cui C.Trace and Rare Earth element Geochemistry of the Early Paleozoic Blackshales in the Lower Yangtze area and Its Geological Significances.Journal of Jilin University:Earth Science Edition,2014,44(4):1108-1122.
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[11] 江永宏,李胜荣.湘、黔地区前寒武—寒武纪过渡时期硅质岩生成环境研究[J].地学前缘,2005,12(4):622-629.JIANG Yong-hong,LI Sheng-rong.A study of the fluid environment of silicalite of transitional Precambrian-Cambrian age in Hunan and Guizhou provinces[J].EarthScience Frontiers,2005,12(4):622-629.
[12] 黄华斌,于瑞莲,卞凯,胡恭任,邱其俊,吴银娇,王晓明.铁观音茶园土壤-茶叶中稀土元素的地球化学特征[J].稀土,2018,39(2):141-147.Huang H B,Yu R L,Bian K,Hu G R,Qiu Q J,Wu Y J,Wang X M.Geochemical Characteristics of Rare Earth Elements in the Soil-tea System in Tieguanyin Tea Gardens[J].Chinese Rare Earths,2018,39(2):141-147.
[13] 张玉松,张杰.云南富源某红土型钛矿稀土元素地球化学特征[J].稀土,2015,36(3):1-8.Zhang Y S,Zhang J.REE geochemistry of lateritic type titanium ore in Fuyuan,Yunnan[J].Chinese Rare Earths,2015,36(3):1-8.
[14] 宋照亮,彭渤,刘丛强.黑色页岩风化过程中元素的活动性及参照系的选取初探——以湖南省麻田、桃花江剖面为例[J].地质科技情报,2004(3):25-29.Song Z L,Peng B,Liu C Q.Discussion on element mobility and reference frame selection during black shale weathering:Example of Profiles From Matian and Taohuajiang in Hunan Province [J].Geological Science and Technology Information,2004(3):25-29.
[15] 钱宝,刘凌,肖潇.土壤有机质测定方法对比分析[J].河海大学学报(自然科学版),2011,39(1):34-38.Qian B,Liu L,Xiao X.Comparative tests on different methods for content of soil organic matter[J].Journal of Hohai University(Natural Sciences),2011,39(1):34-38.
[16] 陈兰,钟宏,胡瑞忠,肖加飞,邹艳荣.黔北早寒武世缺氧事件:生物标志化合物及有机碳同位素特征[J].岩石学报,2006(9):2413-2423.Chen L,Zhong H,Hu R Z,Xiao J F,Zou Y R.2006.Early Cambrian oceanic anoxic event in northern Guizhou biomarkers and organic carbon isotope.Acta Petrologica Sinica,22 (9):2413-2423
[17] 王淑芳,董大忠,王玉满,黄金亮,蒲泊伶.四川盆地南部志留系龙马溪组富有机质页岩沉积环境的元素地球化学判别指标[J].海相油气地质,2014,19(3):27-34.Wang S F,Dong D Z,Wang Y M,Huang J L,Pu B L.Geochemistry evaluation index of Redox-sensitive elements for depositional environments of Silurian Longmaxi Organic-rich Shale in the South of Sichuan Basin[J].Marine Origin Petroleum Geology,2014,19(3):27-34.
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[19] 侯东壮,吴湘滨,刘江龙,吴德华,葛丽萍.黔东南州下寒武统黑色页岩稀土元素地球化学特征[J].中国有色金属学报,2012,22(2):546-552.Hou D Z,Wu X B,Liu J L,WU D H,Ge L P.Geochemical characteristics of rare earth elements in Lower Cambrian black shale in Southeast Qian[J].The Chinese Journal of Nonferrous Metals,2012,22(2):546-552.
[20] 李娟,于炳松,郭峰.黔北地区下寒武统底部黑色页岩沉积环境条件与源区构造背景分析[J].沉积学报,2013,31(1):20-31.Li J,Yu B S,Guo F.Depositional setting and tectonic background analysis on Lower Cambrian Black Shales in the North of Guizhou Province[J].Acta Sedimentologica Sinica,2013,31(1):20-31.
[21] 杨剑.黔北地区下寒武统黑色岩系形成环境与地球化学研究[D].长安大学,2009.Yang J.Study on the formation environment and geochemistry of Lower Cambrian black shale series,Northern Guizhou Province,China[D].Xi’an:Chang’an University,2009:92-96.
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