1. DEFORMATION OF UNLITHIFIED SEDIMENTS IN AN EARLY STAGE OF THE COMPACTION PROCESS DEDUCED FROM MICROTEXTURES AND MAGNETIC FABRICS: ODP LEG 174B, HOLE 1074A
1. DEFORMATION OF UNLITHIFIED SEDIMENTS IN AN EARLY STAGE OF THE COMPACTION PROCESS DEDUCED FROM MICROTEXTURES AND MAGNETIC FABRICS: ODP LEG 174B, HOLE 1074A
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1. 从微纹理和磁性织物推导出压实过程早期阶段未液化沉积物的变形：ODP 腿 174B，孔 1074A
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Hirano
中科院分区：
文献类型：
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作者：
Unlithified Sediments;I. An;E. Stage;A. Hole;S. Hirano;Y. Ogawa;K. Kawamura;S. Hirano
为了揭示压实过程和机制，我们研究了174B段大西洋中脊东侧1074A孔采集的未岩化沉积物的微结构和磁性组构。样品由含有不同数量的有孔虫、粘土、放射虫和沙子的超微化石组成。扫描电子显微镜观察表明，沉积物中的超微化石和浮游有孔虫保存完好，未石化沉积物中的空隙是由超微化石的阶梯状结构和有孔虫的集合体组成的微化石组合形成的，棘状超微化石碎片的数量随着深度的增加而增加，这可能是埋藏过程中压实作用造成的弱变形。然而，磁化率的各向异性结果提供的关于沉积物变形的明显信息很少。这些结果与车载多传感器航迹测量结果是一致的。
To reveal compaction processes and mechanisms, we have studied microtextures and magnetic fabrics of unlithified sediments collected from Hole 1074A, on the eastern flank of the Mid-Atlantic Ridge, during Leg 174B. Samples consisted of nannofossil ooze with varying amounts of foraminifers, clay, radiolarians and sand. Scanning electron microscope observation shows that nannofossils and planktonic foraminifers in the sediments are well preserved, that void space in the unlithified sediments is formed by an assemblage of microfossils consisting of a stairstep structure of nannofossils and an aggregation of foraminifers, and that the number of spine-shaped nannofossil fragments tends to increase with depth, suggesting weak deformation probably due to compaction occurring during burial. Anisotropy of magnetic susceptibility results, however, provide little obvious information about deformation of the sediments. These results are consistent with those of the onboard multisensor track measurements.