黔北官坝—革木地区上二叠统合山组硅质沉积物地球化学特征及其地质意义
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作者单位:

1.甘肃省地质矿产勘查开发局第二地质矿产勘查院;2.西南科技大学环境与资源学院

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P618.13

基金项目:

中国地质调查局地质调查项目“乌蒙山区地质矿产综合调查”(编号:DD20160019)和中国地质调查局地质成都地质调查中心项目“贵州乌蒙山区1:5万店子场(G48E006018)、大关(G48E007017)、六厂(G48E007018)3幅区域地质调查”(编号:DD20160019-04)的资助。


Geochemistry Data of the Siliceous Deposits in the Heshan Formation , Guanba-Gemu area, the Northern Guizhou Province
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The Second Institute of Geology and Minerals Exploration Team, Gansu Provincial Bureau of Geology and Minerals Exploration and Development

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    摘要:

    为明确黔北官坝—革木地区上二叠统合山组硅质沉积物(硅质岩、硅质灰岩)特征及其成因,对硅质沉积物样品进行主量元素、稀土元素和微量元素测试分析。其地球化学结果表明:官坝剖面硅质岩SiO2含量在90.95% ~ 93.98%之间,Al2O3含量在0.46% ~ 0.94%之间;申家寨剖面硅质灰岩SiO2含量在39.18% ~ 63.55%之间,Al2O3含量在0.49% ~ 0.82%之间,CaO含量在18.44% ~ 29.81%之间;硅质沉积物常量元素Al / (Al + Fe + Mn)值在0.18 ~ 0.43之间,Al / (Al + Fe)值在0.18 ~ 0.44之间,U / Th值在0.76 ~ 1.34之间、平均为1.07,ΣREE值7.70 × 10-6 ~ 35.25 × 10-6,均指示硅质沉积物为热水沉积成因;硅质沉积物Ce / Ce*为0.72 ~ 0.87,呈负Ce异常,Eu / Eu*为1.10 ~ 1.41(PM315-DH1为0.98),呈正Eu异常,(La / Yb)N值为1.02 ~ 5.45,平均为3.07,(La / Ce)N值为1.25 ~ 1.60,平均为1.48,指示其形成于受陆源影响输入不明显的大陆边缘环境。结合区域岩相古地理演化特征,在黔北官坝—革木地区晚二叠世长兴期硅质沉积物为热水成因,沉积环境为大陆边缘环境。

    Abstract:

    In order to clarify the characteristics and genesis of the siliceous sediments (siliceous rocks and siliceous limestones) of the Upper Permian Heshan Formation in Guanba-Gemu area, northern Guizhou province, the main elements, rare earth elements and trace elements of the siliceous sediments were tested and analyzed.?The geochemical results show that the SiO2 content of the siliceous rocks in Guanba section is 90.95% ~ 93.98% and the Al2O3 content is 0.46% ~ 0.94%.??The contents of SiO2, Al2O3 and CaO in the Siliceous limestone of Shenjiazhai section range from 39.18% to 63.55%, 0.49% to 0.82% and 18.44% to 29.81%.??The values of Al / (Al + Fe + Mn), Al / (Al + Fe) and U / Th in siliceous sediments range from 0.18 to 0.43, 0.18 to 0.44, and 0.76 to 1.34, with an average of 1.07.??ΣREE values of 7.70×10-6 ~ 35.25×10-6 indicate that the siliceous sediments are caused by hydrothermal deposition.??In siliceous sediments, Ce / Ce* ranges from 0.72 to 0.87, showing negative Ce anomaly. Eu / Eu* ranges from 1.10 to 1.41 (PM315-DH1 is 0.98), and showing positive Eu anomaly. (La / Yb)N values range from 1.02 to 5.45, with an average of 3.07.?(La / Ce)N values range from 1.25 to 1.60, with an average of 1.48, indicating that it was formed in a continental margin environment with no obvious terrigenous input.?Combined with the evolution characteristics of regional lithofacies and paleogeography, the Changsingian Siliceous sediments of late Permian in Guanba-Gemu area of northern Guizhou province are of hydrothermal origin and the sedimentary environment is continental margin environment.

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何碧,辛欢,赵飞,等. 黔北官坝—革木地区上二叠统合山组硅质沉积物地球化学特征及其地质意义[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-03
  • 最后修改日期:2022-05-02
  • 录用日期:2022-05-05
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