| 大兴安岭北段泥盆纪大民山组硅质岩地球化学特征及沉积环境 |
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| 引用本文： | 张渝金,吴新伟,杨雅军,江斌,郭威,张超.大兴安岭北段泥盆纪大民山组硅质岩地球化学特征及沉积环境[J].地质与资源,2015,24(3):173-178. |
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| 作者姓名： | 张渝金 吴新伟 杨雅军 江斌 郭威 张超 |
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| 作者单位： | 1. 中国地质调查局 沈阳地质调查中心(沈阳地质矿产研究所), 辽宁 沈阳 110034;2. 吉林大学 地球科学学院, 吉林 长春 130061 |
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| 基金项目： | 中国地质调查局项目“内蒙古1∶5万济沁河林场等四幅区调”（1212011120664）；“内蒙古1∶5万大旗等四幅区调”（1212011120665）；“内蒙古1∶5万大呼勒气沟等四幅区调”（1212011120666）；“内蒙古1∶5万南燕窝沟等四幅区调”（12120113053900）. |
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| 摘 要： | 大兴安岭北段泥盆纪大民山组硅质岩与硅质泥岩共生出现，硅质泥岩中产丰富海相化石.硅质岩Al/（Al+Fe+Mn）值在0.60~0.71之间，平均值0.65.在Al-Fe-Mn三角图上，样品均落入非热水成因区.MnO/TiO2比值在0.07~0.34，平均值为0.18.m值在13.87~47.15之间，平均值为23.90.CaO/（Fe+CaO）值在0.65~0.98之间，平均值为0.78.ΣREE较低，平均62.77×10-6，LREE/HREE平均值为6.67，相对富集轻稀土，具有轻度的Ce正异常（δCe 1.08~1.30，平均值1.16）.结合硅质岩沉积环境判别图解，一致表明大民山组硅质岩形成于离大陆较近的大陆坡或边缘海的高盐度海水环境.
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| 关 键 词： | 硅质岩 大民山组 地球化学特征 沉积环境 大兴安岭北段 |
| 收稿时间： | 2015-03-06 |
GEOCHEMISTRY AND SEDIMENTARY ENVIRONMENT OF THE SILICEOUS ROCKS FROM DEVONIAN DAMINSHAN FORMATION IN NORTHERN DAXINGANLING |
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| ZHANG Yu-jin,WU Xin-wei,YANG Ya-jun,JIANG Bin,GUO Wei,ZHANG Chao.GEOCHEMISTRY AND SEDIMENTARY ENVIRONMENT OF THE SILICEOUS ROCKS FROM DEVONIAN DAMINSHAN FORMATION IN NORTHERN DAXINGANLING[J].Geology and Resources,2015,24(3):173-178. |
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| Authors: | ZHANG Yu-jin WU Xin-wei YANG Ya-jun JIANG Bin GUO Wei ZHANG Chao |
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| Institution: | 1. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China;2. College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | The silicalite and siliceous mudstone of Devonian Daminshan Formation are developed in northern Daxinganling, where the siliceous mudstone is rich in marine fossils. The Al/(Al+Fe+Mn)values of the siliceous rocks range from 0.60 to 0.71, with an average of 0.65. In the Al-Fe-Mn ternary diagram, all samples fall into non-hydrothermal siliceous rock area. The MnO/TiO2 ratio is 0.07-0.34, and 0.18 in average. The m value is 13.87 to 47.15, averagely 23.90. The CaO/(Fe+CaO) value is between 0.65 and 0.98, with an average of 0.78. The ΣREE is low (averagely 62.77×10-6) and the average LREE/HREE is 6.67. The siliceous rocks are relatively enriched in LREEs, with slightly positive Ce anomalies (δCe 1.08-1.30, averagely 1.16). Combined with the sedimentary environment discrimination diagram for siliceous rocks, it is indicated that the siliceous rocks of Daminshan Formation are formed in the continental slope close to continent or the high-salinity seawater of marginal sea. |
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| Keywords: | siliceous rock Daminshan Formation geochemical characteristics sedimentary environment northern Daxinganling |
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