安徽省水系沉积物39种元素地球化学背景值
Background Values of 39 Chemical Elements in Stream Sediments of Anhui Province, China
自1982年开始,安徽省相关部门开展以水系沉积物测量为主的区域地球化学调查,共完成调查面积8.38 × 104 km2,积累了海量的高质量基础地球化学数据。开发利用这些基础地球化学数据进行不同尺度、不同范围的对比研究是开展元素分散富集、成矿潜力和异常评价的一项重要内容。以安徽省1∶20万区域化探原始数据为依托,以X ± 3S为临界值,一次性剔除离群值后的数据集的中位数作为背景值的估计值,计算出了全省范围及7个大地构造单元、7个成矿带的水系沉积物中39种元素地球化学背景值。结果显示,与全国水系沉积物元素地球化学背景值相比,安徽省水系沉积物显著富集Ti、Zr,强烈富集Ag、Au、B、Hg、Sn、W。受大地构造、地质背景、岩浆活动及成矿作用等影响,不同构造单元、不同成矿带的元素地球化学特征存在显著差异。与全省水系沉积物元素地球化学背景值相比,徐淮地块富集Ni、CaO、MgO,北淮阳构造带、大别构造带均富集Ba、Sr、Na2O,下扬子地块富集Au、B,江南地块、浙西地块均富集Cd、Hg、Mo、Sn、W、Zn。这些背景值为开展区域成矿规律研究提供了重要的对比参数。
Since 1982, relevant departments in Anhui Province have carried out regional geochemical surveys primarily focused on stream sediment measurements. A total area of 83800 square kilometers has been surveyed, accumulating a vast amount of high-quality baseline geochemical data. The utilization and development of these baseline geochemical data for comparative studies at different scales and scopes constitute a crucial aspect of researching element dispersion and enrichment, evaluating metallogenic potential, and assessing anomalies.Based on the 1∶200000 regional geochemical raw data from Anhui Province, using X ± 3S as the threshold, the median of the dataset after a one-time removal of outliers was employed as the estimated background value. The geochemical background values of 39 elements in stream sediments were calculated for the entire province, seven tectonic units, and seven metallogenic belts.The results reveal that, compared to the national geochemical background values for stream sediment elements, the stream sediments in Anhui Province are significantly enriched in Ti and Zr, and strongly enriched in Ag, Au, B, Hg, Sn, and W. Influenced by tectonic setting, geological background, magmatic activity, and mineralization processes, the geochemical characteristics of the elements show significant variations across different tectonic units and metallogenic belts.Compared to the provincial geochemical background values for stream sediment elements: the Xuhuai Block is enriched in Ni, CaO, and MgO; both the North Huaiyang Structural Belt and the Dabie Structural Belt are enriched in Ba, Sr, and Na₂O; the Lower Yangtze Block is enriched in Au and B; and both the Jiangnan Block and the Western Zhejiang Block are enriched in Cd, Hg, Mo, Sn, W, and Zn.These background values provide important comparative parameters for conducting research on regional metallogenic patterns.
| [1] |
龚庆杰, 夏学齐, 刘宁强. 2011 ~ 2020中国应用地球化学研究进展与展望[J]. 矿物岩石地球化学通报, 2020, 39(5):927 - 944. |
| [2] |
王欣, 郑德顺, 孙风波, |
| [3] |
赵少攀, 杨森, 张茜, |
| [4] |
张波, 郭晓英, 孟涛, |
| [5] |
王学求, 周建, 徐善法, |
| [6] |
史长义, 梁萌, 冯斌. 中国水系沉积物39种元素系列背景值[J]. 地球科学, 2016, 41(2):234 - 251. |
| [7] |
刘立芬, 栾欣婷, 李瑛, |
| [8] |
谢学锦, 任天祥, 奚小环, |
| [9] |
向运川, 牟绪赞, 任天祥, |
| [10] |
伦知颖, 程志中, 严光生, 中国不同景观区水系沉积物中39种源的背景值[J]. 地学前缘, 2015, 22(5):226 - 230. |
| [11] |
程志中, 谢学锦, 潘含江, |
| [12] |
刘汉粮, 聂兰仕, |
| [13] |
杜佩轩, 田素荣. 新疆岩石·岩屑·水系沉积物元素背景平均值[J]. 物探与化探, 2001, 25(2):117 - 122. |
| [14] |
李旭东, 李成禄, 杨元江, |
| [15] |
程乃福. 安徽南部成矿区地球化学特征[J]. 安徽地质, 2014, 24(1):36 - 41. |
| [16] |
张万仁, 吴保祥, 韦枫, |
| [17] |
中华人民共和国地质矿产部. 区域地球化学勘查规范 比例尺1∶200000( DZ/T 0167-1995)[S]. 北京:地质出版社, 1995. |
| [18] |
白金峰, 杜雪苗, 郭心玮, |
| [19] |
鲁江, 朱丽芬, 骆检兰, |
| [20] |
杨峥, 彭敏, 赵传冬, |
| [21] |
成杭新, 李括, 李敏, |
| [22] |
史长义. 研究微量元素区域分散与富集规律的新方法[J].物探与化探, 1994, 18(3):219 - 227. |
| [23] |
陈兴仁, 陈富荣, 贾十军, |
| [24] |
吕古贤, 张宝林, 焦建刚, |
| [25] |
吕古贤, 张宝林, 胡宝群, |
| [26] |
陈浩宇, 和文言. 岩浆演化过程中硫化物饱和对斑岩型Cu-Au矿床形成的控制[J]. 现代地质, 2024, 38(4):947 - 958. |
| [27] |
翁望飞, 王德恩, 王敏. 安徽省休宁-歙县地区水系沉积物地球化学特征及找矿远景[J]. 矿物岩石地球化学通报, 2018, 37(5):932 - 942. |
| [28] |
翁望飞, 王德恩, 王邦民, |
安徽省公益性地质工作项目(2024-g-1-9)
/
| 〈 |
|
〉 |