DEFORMATION OF UNLITHIFIED SEDIMENTS IN AN EARLY STAGE OF THE COMPACTION PROCESS DEDUCED FROM MICROTEXTURES AND MAGNETIC FABRICS : ODP LEG 174 B , HOLE 1074 A 1
DEFORMATION OF UNLITHIFIED SEDIMENTS IN AN EARLY STAGE OF THE COMPACTION PROCESS DEDUCED FROM MICROTEXTURES AND MAGNETIC FABRICS : ODP LEG 174 B , HOLE 1074 A 1
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从微观结构和磁性织物推断压实过程早期阶段未液化沉积物的变形：ODP LEG 174 B，Hole 1074 A 1
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Kawamura
中科院分区：
文献类型：
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作者：
S. Hirano;Y. Ogawa;K. Kawamura
为了揭示压实过程和机制，我们研究了从孔1074A，在大西洋中脊的东侧，在腿174 B收集的未石化沉积物的显微结构和磁组构。样品由超微化石软泥与不同数量的有孔虫，粘土，放射虫和沙子。扫描电镜观察表明，沉积物中的超微化石和浮游有孔虫保存较好，未成岩沉积物中的孔隙空间是由超微化石的阶梯状结构和有孔虫的集合体组成的微体化石组合形成的，刺状超微化石碎片的数量随深度的增加而增加，表明在埋藏过程中压实作用可能导致了微弱的变形。磁化率各向异性的结果，但是，提供的沉积物变形的信息很少。这些结果与机载多传感器航迹测量结果一致。
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.