全部 标题 作者
关键词 摘要


湘西北下寒武统黑色岩系地球化学特征

, PP. 304-312

Keywords: 稀土元素,微量元素,黑色岩系,湘西北

Full-Text   Cite this paper   Add to My Lib

Abstract:

对湘西北下寒武统黑色岩系进行了系统的地球化学研究,结果表明:SiO2的含量范围为10.54%~87.10%,平均为51.15%。稀土总量范围较大,为92.70~737.84μg/g,平均为312.73μg/g,LREE相对富集,HREE亏损。Ce呈弱至中等负异常,Eu大部分呈弱的正异常。稀土元素标准化曲线呈弱的帽状形态,较为平缓。微量元素Ni、Mo、Ba、V含量高,主要含矿岩石为磷块岩,而不是炭质页岩。成矿作用以热水作用为主,成矿环境不局限于浅海环境。

References

[1]  潘家永, 马东升, 夏菲, 陈少华, 曹双林, 郭国林, 谢贵珍. 2005. 湘西下寒武统镍钼多金属富集层镍与钼的赋存状态. 矿物学报, 25(3): 283-287.
[2]  王道经,黄怀勇. 1999. 天门山震旦系-寒武系界线事件沉积序列的初步观察与对比分析. 大地构造与成矿学, 23(1): 95-100.
[3]  王敏,孙晓明,马名扬. 2004. 黔西新华大型磷矿磷块岩稀土元素地球化学及其成因意义. 中国稀土学报, 23(4):270.
[4]  吴朝东. 2000. 湘西震旦-寒武纪交替时期古海洋环境的恢复. 地学前缘, 7(增刊): 45-57.
[5]  吴朝东, 申延平, 侯泉林. 2001. 湘西黑色岩系铂族元素地球化学特征及富集因素. 自然科学进展,11(5):507-513.
[6]  吴朝东, 陈其英. 1999. 湘西磷块岩的地球化学特征及成因. 地质科学, 34(2): 213-222
[7]  Taylor S R and Mclcnnan S M. 1985. The continental crust: Its composition and evolution. Oxford: Blackwell Scientific Press, 1-312
[8]  范德廉,张涛,叶杰. 2004. 中国的黑色岩系及其有关矿床. 北京:地质出版社, 3-420
[9]  李有禹. 1997. 湘西北镍钼多金属喷气沉积矿床的地球化学特征. 地球化学, 26(3): 89-96.
[10]  朱笑青,王中刚,陈南生. 1996. 镍钼在黑色岩系中富集成因的实验研究. 大地构造与成矿学, 20(4): 368-374.
[11]  Chen N S and Coveney R M Jr. 1989. Ores in metals?rich shales of Southern China. U S Geological Survey, Curcular, 1037: 7-8.
[12]  Coveney R M Jr and Chen N S. 1991. Ni?Mo?PGE?Au rich ores in Chinese black shales and speculations on possible analogues in the United States. Mineralium Deposita, 26: 83-88.
[13]  Coveney R M Jr, Murowchick J B, Grauch R I et al. 1992. Gold and platinum in shales with evidence against extraterrestrial sources of metals. Chemical Geology, 99: 104-114.
[14]  Ilyin A V. 1998a. Rare?earth geochemistry of ''old'' phosphorites and probability of syngenetic precipition and accumulation of phosphate. Chem Geol, 144: 243-256.
[15]  Ilyin A V. 1998b. Rare?earth element geochemistry of the Mesozoic phosporites of phosphogenesis. Geochem Int, 36: 489-495.
[16]  MaArthur J M and Walsh J N. 1984. Rare earth geochemistry of phosphorites. Chem Geol, 47: 191-220.
[17]  Murry R W, Brink M R B and Gerlach D C. 1990. Rare elements as indicators of different marin depositional environments in chert and shale. Geology, 18(3): 268-271.
[18]  Shields G and Stille P. 2001. Diagenetic constraints on the use of cerium anomalies as palaeoseawater redox proxies: An isotopic and REE study of Cambrain phosphorites. Chem Geol, 175: 29-48.

Full-Text

comments powered by Disqus