Magnetic stratigraphic dating of marine hydrogenetic ferromanganese crusts.
Magnetic stratigraphic dating of marine hydrogenetic ferromanganese crusts.
复制标题
海相水成铁锰结壳的磁性地层测年
DOI：
10.1038/s41598-017-17077-8
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发表时间：
2017-12-01
影响因子：
4.6
通讯作者：
Zhu B
中科院分区：
文献类型：
--
作者：
Yuan W;Zhou H;Zhao X;Yang Z;Yang Q;Zhu B
深海水成铁锰结壳既是潜在的多金属资源，又是长期环境变化的记录。在古海洋学研究中，建立一个详细可靠的年代学格架是非常重要的。本文报道了太平洋(PO-01)、南中国海(南海-01，南海-02)和印度洋(IO-01)四个铁锰成水结壳的详细磁性地层学和岩石磁性研究结果。定义了PO-01、SCS-01和SCS-02样品的两组特征剩余磁化方向，它们的正极和反极近乎相反，表明了地球磁场的初步记录。通过与2012年地磁极性时间尺度对比建立的磁性地层格架表明，PO-01、SCS-01、SCS-02和IO-01样品的生长速率分别为4.82 mm/Ma、4.95 mm/Ma、4.48 mm/Ma和11.28 mm/Ma。岩石磁学测量表明，太平洋和印度洋的铁锰结壳样品以低矫顽力、不相互作用的单畴磁铁矿(SD)颗粒为主，而南中国海的铁锰结壳样品以SD/拟单畴(PSD)颗粒为主。所有样品中也可能存在多域(MD)磁铁矿。
Deep-sea hydrogenetic ferromanganese crusts are both potential polymetallic resources and records of long-term environmental changes. For palaeoceanographic studies, it is important to construct a detailed and reliable chronological framework. Here, we report the results of a detailed magnetostratigraphic and rock magnetic study of four hydrogenetic Fe-Mn crusts from the Pacific Ocean (PO-01), South China Sea (SCS-01, SCS-02) and Indian Ocean (IO-01). Two groups of characteristic remanent magnetization directions were defined with nearly antipodal normal and reversed polarities for samples PO-01, SCS-01 and SCS-02, indicating a primary record of the Earth’s magnetic field. The magnetostratigraphic framework, established via correlation with the Geomagnetic Polarity Time Scale 2012, implies growth rates of 4.82 mm/Ma, 4.95 mm/Ma, 4.48 mm/Ma and 11.28 mm/Ma for samples PO-01, SCS-01, SCS-02 and IO-01, respectively. Rock magnetic measurements revealed that the Fe-Mn crust samples from the Pacific Ocean and Indian Ocean were dominated by low coercivity, non-interacting, single-domain (SD) magnetite particles, whereas the South China Sea samples were dominated by SD/pseudo-single-domain (PSD) particles. Multidomain (MD) magnetite may also be present in all samples.
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影响因子：
--
作者：
GROMME, CS;WRIGHT, TL;PECK, DL
通讯作者：
PECK, DL
影响因子：
3.9
作者：
BANAKAR, VK;BOROLE, DV
通讯作者：
BOROLE, DV
影响因子：
2.9
作者：
HEIN, JR;SCHWAB, WC;DAVIS, AS
通讯作者：
DAVIS, AS
影响因子：
2.3
作者：
DAY, R;FULLER, M;SCHMIDT, VA
通讯作者：
SCHMIDT, VA
影响因子：
--
作者：
Hein, James R.;Bohrson, Wendy A.;Clague, David A.
通讯作者：
Clague, David A.