| 摘要: |
| 1995年5月，引用地矿部“七五”东北太平洋CCA121柱状沉积物的8个元素地球化学分析数据，利用空间因子分析方法确定两种周期尺度（D1＝65cm，D2＝105cm）内的沉积地球化学旋回元素组合，并据此探讨多金属结核成矿与物源环境的关系．研究表明，与小尺度周期（D1＝65cm）对应的元素组合为：Ud1（Mn，Co，Cu，Al2O3，SiO2）和Ud3（Fe，Ca，Co，Cu）与大尺度周期对应的元素组合为：Ud1（Co）和Ud2（Mn，Fe，Al2O3）。小尺度的周期性环境变化伴随着陆源、自生源和生物源物质的旋回变化，并诱发成矿元素Mn，Co，Cu和Fe的振荡式活化、迁移和沉淀，参与多金属结核成矿；大尺度的周期性环境变化伴随着自生源和火山（热液）源物质的旋回变化，并诱发Co，Fe和Mn元素发生振荡式活化、迁移和沉淀，参与多金属结核成矿。多金属结核的各成矿元素受沉积物中呈不同尺度周期性变化的物源组成的制约。 |
| 关键词: 空间因子分析 地球化学旋回 元素组合 尺度 |
| DOI： |
| 分类号: |
| 基金项目:国家海洋局青年基金资助项目，95204号 |
|
| SPATIAL FACTOR ANALYSIS AND DETERMINATION OF ELEMENT ASSOCIATIONS RELATING TO SEDIMENTARY GEOCHEMISTRY CYCLES |
|
MENG Xian-Wei,WU Shi-ying,HAN Yi-bing
|
|
First Institute of Oceanology, State Oceanic Administration, Qingdao 266003
|
| Abstract: |
| In May, 1995, using geochemical data of the CCA121 sediment core collected by MGMR and the method of spectrum decomposition for multivariate time series-spatial factor analysis, element associations in association with geochemical cycles were identified on two spatial scales (i.e. D1＝65 cm，D2＝105 cm). The elements associations corresponding to the small scale (D1＝65 cm) were Ud1 (Mn, Co, Cu, Al2O3, SiO2) and Ud3 (Fe, Ca, Co, Cu) those corresponding to the large scale (D2＝105 cm) were Ud1(Co) and Ud2 (Mn, Fe, Al2O3). Periodic environmental changes relating to the smaller scale were accompanied by cyclic changes in terrestrial, authigenic and biogenic inputs, reducing the remobilization, migration and deposition of metallogenetic elements Mn, Co, Cu and Fe in the form of oscillation; these elements were involved in the metallogenitic process of polymetallic nodules. On the other hand, periodic environmental changes relating to the large scale were accompanied by cyclic changes in authigenic and vocanogenic (hydrothermal) inputs, reducing the remobilization, migration, and deposition of metallogenetic elements Co, Fe, and Mn in the same way during the formation of polymetallic nodules. Such oscillatory metallogenetic processed for each of the metallogenetic elements were controlled by source composition of sediments which varies periodically on different scales. |
| Key words: Spatial factor analysis, Geochemical cycle, Element association, Scale |
