晚白垩纪以来麦哲伦海山表面沉积的斜坡再造制约模式

Deformation of seamount slopes such as landslide, slopes adjustment, promoted or inhibited subsequent ferromanganese oxides deposition or interrupted the early ferromanganese crusts to grow continuously, thus changed time series and space distribution pattern of surface sedimentation on seamount slopes. Here, We will take guyot ME and MK of The Magellan seamounts as the research object, to describe spatial distribution of unconsolidated sediments and cobalt-rich crusts on typical section of seamount slopes, analyze the relationship between surface sedimentary bodies and slopes morphology corresponding; identify and extract sedimentary records in crusts and its substrate on the Magellan seamounts since late cretaceous, analyze profile features of mechanical growth gap, i.e. material properties, structure, chronology, find out history of slopes deformation on seamounts since the late cretaceous. Finally, analyze the relationship between crusts growth sequence and history of slopes deformation, to setup models of restricting surface sediments by substrate deformation on the Magellan Seamounts since the late Cretaceous. These models could extend study connotation of environmental records of cobalt-rich crusts growth, enhance theory and methodology of mineral resources evaluation of cobalt-rich crusts on seamounts. The study, not only could provide effective space anisotropic factors to identify ore-rich body areas, but also provide indirect or background information for research on oceanic plate movement and pale-oceanography.

海山斜坡形变、滑坡等形态的变迁（即海山斜坡再造）促进或抑制随后的铁锰氧化物沉积，或造成前期沉积中断，进而导致斜坡表面沉积类型时空分布格局的改变。该研究，以海山斜坡再造对表面沉积的促进或抑制模式（简称制约模式）为研究目标，以麦哲伦海山区ME和MK平顶海山为主要研究对象。拟通过其典型剖面上不同坡度范围对应的松散沉积物和富钴结壳的空间分布，精细刻画当前两类斜坡表面沉积体与斜坡形貌的对应关系；识别并提取晚白垩纪以来麦哲伦海山斜坡形貌再造过程的沉积断面记录，分析结壳机械性生长间断剖面的物质属性、结构、年代学等特征，重塑晚白垩纪以来海山斜坡再造历史；通过结壳生长世代与斜坡再造历史的关联性研究，建立“晚白垩纪以来麦哲伦海山表面沉积的斜坡再造制约模式”。为拓展结壳生长环境记录的研究内涵、完善结壳资源评价理论与方法，提供参考依据；为富钴结壳圈矿工作提供空间各向异性的有效指标，为古海洋学研究提供斜坡再造信息。

富钴结壳包含多种有用金属Mn, P, Co,Ni, Ti, Pt,稀土元素，为战略矿产资源。本研究以海山斜坡再造对表面沉积的促进或抑制模式为研究目标，通过其典型剖面上不同坡度范围对应的松散沉积物和富钴结壳的空间分布，精细刻画当前两类斜坡表面沉积体与斜坡形貌的对应关系，识别并提取晚白垩纪以来麦哲伦海山斜坡形貌再造过程的沉积断面记录，分析结壳机械性生长间断剖面的物质属性、结构等特征，重塑晚白垩纪以来海山斜坡再造历史，通过结壳生长世代与斜坡再造历史的关联性研究，建立“晚白垩纪以来麦哲伦海山表面沉积的斜坡再造制约模式”。.1.建立了受斜坡地形变化所限制的海山沉积模式.研究了表层沉积类型和斜坡关系；海山演化与斜坡地形变化关系；斜坡地形变化对地层记录的影响；提出建立了坡度形态对海山表层沉积物的限制模型；麦哲伦海山结壳层结构及分布模型；结壳层空间分布-地形控制模型。将为富钴结壳圈矿，提供易于获取的、空间各向异性的、有效识别富矿体的指标。表层沉积的斜坡制约模式，还能够从富钴结壳等表面沉积记录中，部分恢复晚白垩纪以来麦哲伦海山形态变迁历程，为洋壳板块运动、古海洋学研究提供斜坡改造的间接或本底信息。.2.海山地质统计学的变差函数及多海山联合数据模拟.研究构建了新变差函数“距离-坡度”变差函数相似，及效果相似而简便的“距离-相对水深”变差函数；同时，给出多海山联合数据的变差函数试验与模拟方法。.3.海山富钴结壳资源评价系统方法.研究建立了富钴结壳潜在资源定量评价及空间预测模型，提出富钴结壳资源定量评价系统方法。实现富钴结壳资源的空间分布或潜在资源分布估计，弥补稀疏调查站位对巨大海山资源分布的控制力的不足。方法可用于远景海山区或重点勘探靶区。