| 皖北宿州地区寒武系豹皮灰岩地球化学特征及其地质意义 |
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| 引用本文： | 吴灿灿.皖北宿州地区寒武系豹皮灰岩地球化学特征及其地质意义[J].地质与勘探,2018,54(1):90-101. |
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| 作者姓名： | 吴灿灿 |
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| 作者单位： | 宿州学院资源与土木工程学院，安徽宿州； 国家煤矿水害防治工程技术研究中心，安徽宿州 |
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| 基金项目： | 国家自然科学基金青年项目（编号：41502057）、宿州学院自然科学研究项目（编号：2014yyb08）、安徽省高校优秀青年人才支持计划重点项目（编号：gxyqZD2016346）和宿州学院博士科研启动基金（编号：2015jb08）联合资助 |
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| 摘 要： | 为研究宿州地区寒武系豹皮灰岩地球化学特征及其地质意义,对研究区岩石进行了系统鉴定,并对其主量元素和微量元素进行了地球化学测试。结果显示:寒武系豹皮灰Ti含量、Er/Nd、Y/Ho值均偏低,反应其形成过程中受到陆源碎屑的影响。元素具有明显的U、Pb、Sr、Sm富集及Ba、Nb、Ce、Pr、Zr亏损,稀土总量为3.07×10~(-6)~7.00×10~(-6)(平均为5.33×10~(-6)),低于典型海相灰岩值。V含量较低,V/Cr比值在1.02~1.73之间,说明豹皮灰岩形成于氧化环境;Sr/Ba异常值较高,反映了高度咸化条件下的海相沉积;Sr/Cu值暗示了干旱的气候条件。综合前述认识,研究区豹皮灰岩应形成于局限碳酸盐岩台地环境。
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| 关 键 词： | 地球化学特征 豹皮灰岩 寒武系 皖北 宿州 |
| 收稿时间： | 2017/4/24 0:00:00 |
| 修稿时间： | 2017/10/30 0:00:00 |
Geochemical characteristics of the Cambrian leopard limestone in the Suzhou area, northern Anhui Province and its geological implications |
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| Wu Can-can.Geochemical characteristics of the Cambrian leopard limestone in the Suzhou area, northern Anhui Province and its geological implications[J].Geology and Prospecting,2018,54(1):90-101. |
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| Authors: | Wu Can-can |
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| Institution: | School of earth sciences and engineering, Suzhou University, Suzhou, Anhui; National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou, Anhui |
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| Abstract: | The purpose of this work was to understand the geochemical characteristics of the leopard limestone of Cambrian in the Suzhou area and its geological implications. This rock in the study area was identified and its major elements and trace elements were geochemically analyzed. The results show that the content of Ti, and values of Er/Nd and Y/Ho of this rock are all low, suggesting the influence of land-source clastics during its formation process. The elements U, Pb, Sr, and Sm are rich, while Ba, Nd, Ce, Pr, and Zr are depleted. The total REE in this limestone is 3.07×10-6~7.00×10-6 (5.53×10-6 on average), lower than the typical value of marine limestone. The content of V is low, and the ratio of V/Cr is between 1.02~1.73, indicating that this limestone formed in an oxidation environment. Its high Sr/Ba anomaly implies marine sediments under a highly salted condition, while the Sr/Cu value means a dry climate during that time. It is inferred that this leopard limestone of the study area should form in a limited carbonate platform. |
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| Keywords: | geochemical characteristics leopard limestone Cambrian northern Anhui Province |
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