| 赣东北地区不同时代硅质岩的地球化学特征及其地质意义 |
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| 引用本文： | 吴新华,楼法生,王玉净,宋志瑞,杨群,邓国辉,黄志忠,凌联海.赣东北地区不同时代硅质岩的地球化学特征及其地质意义[J].高校地质学报,2004,10(2):209-216. |
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| 作者姓名： | 吴新华 楼法生 王玉净 宋志瑞 杨群 邓国辉 黄志忠 凌联海 |
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| 作者单位： | 1. 江西省地质调查院，南昌向塘 330201; 2. 中国地质科学院南京地质古生物研究所，南京 210008 |
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| 基金项目： | 国家自然基金资助项目 (NO .4 0 172 0 0 4 )，国家地质调查项目景德镇市幅、上饶市幅、南昌市幅 1∶2 5万区域地质调查 (编号 :2 0 0 130 0 0 0 2 0 91)资助 |
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| 摘 要： | 赣东北地区硅质岩各时代均有不同程度的发育，各时代硅质岩的SiO2含量变化范围为74．90％～97．19％，Si／Al为10．84～93．21，与Al2O3呈较好的负相关关系，表明它们含有较高比例的陆源泥质沉积物，硅质岩样品的Al2O3／(Al2O3+F2O3)=0．60～0．99，Ce／Ce=0．99～1．22，(La／Ce)N=0．91～1．83，V／Y<5．78，Ti／V>17。上述特征表明本区硅质岩形成于大陆边缘构造环境，而与大洋盆地及洋中脊构造环境无关。自古生代以来，该地区没有出现深海大洋盆地环境。
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| 关 键 词： | 硅质岩 地球化学特征 构造环境 赣东北 |
| 文章编号： | 1006-7493(2004)02-209-08 |
| 修稿时间： | 2003年10月10 |
Geochemical Characteristics for Siliceous Rocks of Different Ages in Northeastern Jiangxi and Their Geological Significance |
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| WU Xin-hua ,LOU Fa-sheng ,WANG Yu-jing ,SONG Zhi-rui ,YANG Qun DENG Guo-hui ,HUANG Zhi-zhong ,LING Lian-hai.Geochemical Characteristics for Siliceous Rocks of Different Ages in Northeastern Jiangxi and Their Geological Significance[J].Geological Journal of China Universities,2004,10(2):209-216. |
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| Authors: | WU Xin-hua LOU Fa-sheng WANG Yu-jing SONG Zhi-rui YANG Qun DENG Guo-hui HUANG Zhi-zhong LING Lian-hai |
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| Institution: | 1. Jiangxi Institute of Geological Survey, Xiangtang, Nanchang 330201, China; 2. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China |
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| Abstract: | The siliceous rocks are widely developed in strata of different ages in the northeastern JianXi Province．Their Si02 contents are in the range of72．2％ ～97．19％ ，and their Si／Al ratios are 10．84～9321．The Si02 contents are well negatively correlated with A]2O3 contents．This implies that these rocks have a source with higher proportion of terrestrial muddy sediments．Some geochemical characteristics of these siliceous rocks ale shown below： AL2O3／( AL2O3+Fe203)=0．60～0．99，Ce／Ce =0．99～1．22，(La／Ce)N=0．91～1．83；V／Y<5．78，Ti／V>17．These characteristics indicate that they were formed in a tectonic environment of continental margin．There is no relation with the deep oceanic basins and／or mid-ocean ridges．Since the Paleozoic the tectonic environment of deep oceanic basins was not developed in this region． |
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| Keywords: | siliceous rocks geochemical characteristics tectonic environment northeastern Jiangxi Province |
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