湘中南地区二叠系龙潭组煤中稀土元素地球化学特征
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摘要
采用XRF、ICP-MS等技术测定了湘中南地区二叠系龙潭组5个煤层煤样的主量元素与稀土元素含量。对主量元素和稀土元素地球化学特征、稀土元素分配模式、赋存状态及来源、成煤环境等的研究表明,湘中南煤中∑REE变化于10.42×10~(-6)～122.73×10~(-6),平均为63.67×10~(-6),高于世界煤均值;LREE/HREE变化于4.26～11.63,平均为7.35,具有弱Ce负异常(δCe:0.85～1.08)和显著Eu负异常(δEu:0.55～0.71),表明成煤环境为受海水影响较弱的还原环境;∑REE与煤灰分产率、Si、Al、Ca等呈正相关关系,三角端元图解显示靠近陆源区的泥炭沼泽覆水程度较浅,碎屑物质注入较多,造成煤中稀土元素含量高;湘中南地区龙潭组煤与基底前寒武纪板岩等具有相似的稀土元素分配曲线,呈现继承性的关系。
The XRF and ICP-MS methods were used to determine the abundances of major elements and REE of five samples of Permian Longtan Formation coals from south central Hu'nan province. The detailed studies of major elements and REE geochemistry characteristics, chondrite-normalized REE distribution patterns, occurrence mode, source and coal-accumulating environments show that the concentration of REEs ranges from 10.42×10~(-6) to 122.73×10~(-6) with an average value of 63.67×10~(-6), which are higher than world coal on average. LREE/HREE ranges from 4.26 to 11.63 with an average value of 7.35. Moderate Eu negative anomaly(δEu: from 0.55 to 0.71) and weak Ce anomaly(δCe: from 0.85 to 1.08) were observed for all coal samples, which suggest reducing environment with weak influence of seawater. The positive and significant correlations of ∑REE vs. ash yield, Si, Al, Ca were seen in bivariate plot. The triangular diagram analysis shows that the Permian Longtan Formation coals formed in terrigenous detrital-dominated coal-accumulating swamp near provenance with shallow water and were characterized by higher REEs content. The REEs contents and distribution patterns of Permian Longtan Formation coal samples are similar to those of Precambrian basement slate and show an inheritance relationship.
The XRF and ICP-MS methods were used to determine the abundances of major elements and REE of five samples of Permian Longtan Formation coals from south central Hu'nan province. The detailed studies of major elements and REE geochemistry characteristics, chondrite-normalized REE distribution patterns, occurrence mode, source and coal-accumulating environments show that the concentration of REEs ranges from 10.42×10~(-6) to 122.73×10~(-6) with an average value of 63.67×10~(-6), which are higher than world coal on average. LREE/HREE ranges from 4.26 to 11.63 with an average value of 7.35. Moderate Eu negative anomaly(δEu: from 0.55 to 0.71) and weak Ce anomaly(δCe: from 0.85 to 1.08) were observed for all coal samples, which suggest reducing environment with weak influence of seawater. The positive and significant correlations of ∑REE vs. ash yield, Si, Al, Ca were seen in bivariate plot. The triangular diagram analysis shows that the Permian Longtan Formation coals formed in terrigenous detrital-dominated coal-accumulating swamp near provenance with shallow water and were characterized by higher REEs content. The REEs contents and distribution patterns of Permian Longtan Formation coal samples are similar to those of Precambrian basement slate and show an inheritance relationship.
引文
[1] 黄文辉,杨起,汤达祯,赵志根,唐修义. 华北晚古生代煤的稀土元素地球化学特征[J]. 地质学报,1999,73(4):360-369.Huang W H, Yang Q, Tang D Z, Zhao Z G, Tang X Y. Geochemistry of rare earth elements in Late Paleozoic coals in the North China[J]. Acta Geologica Sinica, 1999, 73(4): 360-369.
[2] 赵志根,唐修义. 中国煤中的稀土元素[J]. 中国煤田地质,2002,14(S1):71-75.Zhao Z G, Tang X Y. Rare-earth elements in coal of China[J]. Coal Geology of China, 2002,14(S1):71-75.
[3] 庄新国,曾荣树,徐文东. 山西平朔安太堡露天矿9号煤层中的微量元素[J]. 地球科学,1998,23(6):40-45.Zhuang X G, Zeng S R, Xu W D. Trance elements in No.9 coal seam from Antaibao open pit mine, Pingshuo, Shanxi province[J]. Earth Science, 1998, 23(6): 40-45.
[4] 马东升,潘家永,解庆林,何江. 湘中锑(金)矿床成矿物质来源——Ⅰ.微量元素及其实验地球化学证据[J]. 矿床地质,2002,21(4):366-376.Ma D S, Pan J Y, Xie Q L, He J. Ore source of Sb(Au) deposits in central Hunan: I. Evidences of trace elements and experimental geochemistry[J]. Mineral Deposits, 2002, 21(4): 366-376.
[5] Shifeng Dai, Deyi Ren, Chen-Lin Chou, Robert B Finkelman, Vladimir V Seredin, Yiping Zhou. Geochemistry of trace elements in Chinese coals:A review of abundances, genetic types, impacts on human health, and industrial utilization[J]. International Journal of Coal Geology, 2012, 94: 3-21.
[6] Sun R Y, Liu G J, Zheng L G, Chou C L. Geochemistry of trace elements in coals from the Zhuji mine, Huainan coalfield, Anhui, China[J]. International Journal of Coal Geology, 2010, 81(2): 81-96.
[7] 李焕同,曹代勇,王林杰,郭爱军,李友飞,徐浩. 雪峰山东缘湘中地区控煤构造特征及演化[J]. 大地构造与成矿学,2013,37(4):611-621.Li H T, Cao D Y, Wang L J, Guo A J, Li Y F, Xu H. Characteristics and evolution of coal-controlled structures on the east slope of the Xuefengshan domain in central Hunan province[J]. Geotectonica et Metallogenia, 2013, 37(4):611-621.
[8] Boynton W V. Geochemistry of The Rare Earth Elements: Meteorites Studies[M]. Amsterdam: Elsevier, 1984: 63-114.
[9] 陶琰,金景福,唐建武,曾令交. 湘中锡矿山式锑矿稀土元素地球化学研究[J]. 成都理工学院学报,1999,26(3):96-100.Tao Y, Jin J F, Tang J W, Zeng L J. The REE geochemical characteristics of Xikuangshan-type antimony deposits in central Hunan province[J]. Journal of Chengdu University of Technology, 1999, 26(3): 96-100.
[10] 梁华英. 龙山金锑矿床成矿物质来源研究[J]. 矿床地质,1989,8(4):39-48.Liang H Y. Ore material sources of the Longshan gold-antimony deposit[J]. Mineral Deposits, 1989, 8(4): 39-48.
[11] Finkelman R B. Trace and Minor Elements in Coal[M]. New York: Plenum Press, 1993.593-607.
[12] Valkovic V. Trace Elements in Coal[M]. Boca Raton: CRC Press, 1983. 558.
[13] 彭正奇,汪涛,龚玉红. 湖南二叠纪含煤地层研究新进展[J]. 湖南地质,1997,16(1):22-25.Peng Z Q, Wang T, Gong Y H. New ideas on the study of Permian period coal-bearing strata in Hunan[J]. Hunan Geology, 1997, 16(1): 22-25.
[14] Murray R W, Brink M R, Jones D L, Gerlach D C, Russ III G Price. Rare earth elements as indications of different marine depositional environments in chert and shale[J].Geology, 1990, 18: 268-271.
[15] 吴盾,孙若愚,刘桂建. 淮南朱集井田二叠纪煤中稀土元素地球化学特征及其地质解释[J].地质学报,2013,87(8):1158-1166.Wu D, Sun R Y, Liu G J. Characterization of REE geochemistry of the Permian coals from the Zhuji coal mine, Huainan coalfield and its geological implication[J]. Acta Geologica Sinica, 2013, 87(8): 1158-1166.
[16] 唐修义,黄文辉. 中国煤中微量元素[M]. 北京:商务印书馆,2004.293-310.Tang X Y,Huag W H. Trace Elements in Chinese Coal[M].Beijing: The Commercial Press, 2004.293-310.
[17] 赵志根,唐修义,李宝芳. 淮南矿区煤的稀土元素地球化学[J]. 沉积学报,2000,18(3):453-459.Zhao Z G, Tang X Y, Li B F. Geochemistry of rare-earth elements of coal in Huainan mining area[J]. Acta Sedimentologica Sinica, 2000, 18(3): 453-459.
[18] 郝吉生,葛宝勋,谢洪波. “灰成分端元分析法”及其在聚煤环境分析中的应用[J]. 沉积学报,2000,18(3):460-464.Hao J S, Ge B X, Xie H B. The analysis method based on ash-composition and its application in coal-accumulating environment reconstruction[J]. Acta Sedimentologica Sinica, 2000, 18(3): 460-464.
[19] 赵师庆,王飞宇,董名山. 论“沉煤环境—成煤类型—煤质特征”概略成因模型——Ⅰ.环境与煤相[J]. 沉积学报,1994,12(1):32-39.Zhao S Q, Wang F Y, Dong M S. Discussion on the “sedimentary environment-type of coal-forming-characteristic of coal quality” rough genetic modelⅠ. Environment and coal facies[J]. Acta Sedimentologica Sinica, 1994, 12(1): 32-39.
[2] 赵志根,唐修义. 中国煤中的稀土元素[J]. 中国煤田地质,2002,14(S1):71-75.Zhao Z G, Tang X Y. Rare-earth elements in coal of China[J]. Coal Geology of China, 2002,14(S1):71-75.
[3] 庄新国,曾荣树,徐文东. 山西平朔安太堡露天矿9号煤层中的微量元素[J]. 地球科学,1998,23(6):40-45.Zhuang X G, Zeng S R, Xu W D. Trance elements in No.9 coal seam from Antaibao open pit mine, Pingshuo, Shanxi province[J]. Earth Science, 1998, 23(6): 40-45.
[4] 马东升,潘家永,解庆林,何江. 湘中锑(金)矿床成矿物质来源——Ⅰ.微量元素及其实验地球化学证据[J]. 矿床地质,2002,21(4):366-376.Ma D S, Pan J Y, Xie Q L, He J. Ore source of Sb(Au) deposits in central Hunan: I. Evidences of trace elements and experimental geochemistry[J]. Mineral Deposits, 2002, 21(4): 366-376.
[5] Shifeng Dai, Deyi Ren, Chen-Lin Chou, Robert B Finkelman, Vladimir V Seredin, Yiping Zhou. Geochemistry of trace elements in Chinese coals:A review of abundances, genetic types, impacts on human health, and industrial utilization[J]. International Journal of Coal Geology, 2012, 94: 3-21.
[6] Sun R Y, Liu G J, Zheng L G, Chou C L. Geochemistry of trace elements in coals from the Zhuji mine, Huainan coalfield, Anhui, China[J]. International Journal of Coal Geology, 2010, 81(2): 81-96.
[7] 李焕同,曹代勇,王林杰,郭爱军,李友飞,徐浩. 雪峰山东缘湘中地区控煤构造特征及演化[J]. 大地构造与成矿学,2013,37(4):611-621.Li H T, Cao D Y, Wang L J, Guo A J, Li Y F, Xu H. Characteristics and evolution of coal-controlled structures on the east slope of the Xuefengshan domain in central Hunan province[J]. Geotectonica et Metallogenia, 2013, 37(4):611-621.
[8] Boynton W V. Geochemistry of The Rare Earth Elements: Meteorites Studies[M]. Amsterdam: Elsevier, 1984: 63-114.
[9] 陶琰,金景福,唐建武,曾令交. 湘中锡矿山式锑矿稀土元素地球化学研究[J]. 成都理工学院学报,1999,26(3):96-100.Tao Y, Jin J F, Tang J W, Zeng L J. The REE geochemical characteristics of Xikuangshan-type antimony deposits in central Hunan province[J]. Journal of Chengdu University of Technology, 1999, 26(3): 96-100.
[10] 梁华英. 龙山金锑矿床成矿物质来源研究[J]. 矿床地质,1989,8(4):39-48.Liang H Y. Ore material sources of the Longshan gold-antimony deposit[J]. Mineral Deposits, 1989, 8(4): 39-48.
[11] Finkelman R B. Trace and Minor Elements in Coal[M]. New York: Plenum Press, 1993.593-607.
[12] Valkovic V. Trace Elements in Coal[M]. Boca Raton: CRC Press, 1983. 558.
[13] 彭正奇,汪涛,龚玉红. 湖南二叠纪含煤地层研究新进展[J]. 湖南地质,1997,16(1):22-25.Peng Z Q, Wang T, Gong Y H. New ideas on the study of Permian period coal-bearing strata in Hunan[J]. Hunan Geology, 1997, 16(1): 22-25.
[14] Murray R W, Brink M R, Jones D L, Gerlach D C, Russ III G Price. Rare earth elements as indications of different marine depositional environments in chert and shale[J].Geology, 1990, 18: 268-271.
[15] 吴盾,孙若愚,刘桂建. 淮南朱集井田二叠纪煤中稀土元素地球化学特征及其地质解释[J].地质学报,2013,87(8):1158-1166.Wu D, Sun R Y, Liu G J. Characterization of REE geochemistry of the Permian coals from the Zhuji coal mine, Huainan coalfield and its geological implication[J]. Acta Geologica Sinica, 2013, 87(8): 1158-1166.
[16] 唐修义,黄文辉. 中国煤中微量元素[M]. 北京:商务印书馆,2004.293-310.Tang X Y,Huag W H. Trace Elements in Chinese Coal[M].Beijing: The Commercial Press, 2004.293-310.
[17] 赵志根,唐修义,李宝芳. 淮南矿区煤的稀土元素地球化学[J]. 沉积学报,2000,18(3):453-459.Zhao Z G, Tang X Y, Li B F. Geochemistry of rare-earth elements of coal in Huainan mining area[J]. Acta Sedimentologica Sinica, 2000, 18(3): 453-459.
[18] 郝吉生,葛宝勋,谢洪波. “灰成分端元分析法”及其在聚煤环境分析中的应用[J]. 沉积学报,2000,18(3):460-464.Hao J S, Ge B X, Xie H B. The analysis method based on ash-composition and its application in coal-accumulating environment reconstruction[J]. Acta Sedimentologica Sinica, 2000, 18(3): 460-464.
[19] 赵师庆,王飞宇,董名山. 论“沉煤环境—成煤类型—煤质特征”概略成因模型——Ⅰ.环境与煤相[J]. 沉积学报,1994,12(1):32-39.Zhao S Q, Wang F Y, Dong M S. Discussion on the “sedimentary environment-type of coal-forming-characteristic of coal quality” rough genetic modelⅠ. Environment and coal facies[J]. Acta Sedimentologica Sinica, 1994, 12(1): 32-39.
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