Tectonic, climatic, and diagenetic control of magnetic properties of sediments from Kumano Basin, Nankai margin, southwestern Japan
Tectonic, climatic, and diagenetic control of magnetic properties of sediments from Kumano Basin, Nankai margin, southwestern Japan
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南海ODP 1143站点早上新世以来的磁性地层
DOI：
10.1016/j.margeo.2017.07.006
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发表时间：
2017-09
期刊：
影响因子：
2.9
通讯作者：
Hongqiang Wang
中科院分区：
文献类型：
--
作者：
Meinan Shi;Huaichun Wu;Andrew P. Roberts;Shihong Zhang;Xixi Zhao;Haiyan Li;Xin Su;Tianshui Yang;Liao Chang;Pengxiang Hu;Xiang Zhao;Hongqiang Wang
综合大洋钻探计划（IODP）C0002站点在熊野盆地取芯，熊野盆地是日本西南部南海边缘的一个弧前盆地。最高的1052.5米的沉积物中的增生棱镜，斜坡，并覆盖弧前盆地在远征315不连续恢复。磁性矿物从站点C0002进行了研究，以了解沉积，构造和成岩过程中，在这个弧前环境。识别出4个岩石磁性单元（A、B、C和D）。在A单元弧前盆地沉积物中，表层沉积物中高浓度的碎屑磁性铁氧化物逐渐被成岩溶解所取代。然而，大的钛磁铁矿颗粒幸存的成岩溶解沿着与主机硅酸盐内的磁性纳米包裹体，保存一个残留的磁性信号，记录气候调制的沉积物输送到熊野盆地。在单元B的弧前盆地沉积物中，自生铁硫化物（铁磁性硼硅岩和顺磁性黄铁矿）与天然气水合物和甲烷厌氧氧化有关。单元C的斜坡沉积物和单元D的增生棱柱体沉积物中更深处的甲烷排放导致沿沉积物裂缝沿着形成黄铁矿聚集体，并导致这些单元中磁性信号的进一步成岩耗竭。熊野盆地的构造演化导致天然气水合物稳定带（GHSZ）随时间的迁移，因此C0002站点沉积物记录了现在和化石GHSZ的位置。熊野盆地沉积物的磁性提供了深入了解成岩，气候和构造过程之间的相互作用，控制了这个弧前盆地的沉积演化。
Integrated Ocean Drilling Program (IODP) Site C0002 was cored in the Kumano Basin, which is a forearc basin in the Nankai margin of southwest Japan. The uppermost 1052.5 m of sediment in the accretionary prism, slope, and overlying forearc basin was recovered discontinuously during Expedition 315. Magnetic minerals from Site C0002 were studied to understand sedimentary, tectonic, and diagenetic processes in this forearc environment. Four rock magnetic units (A, B, C, and D) are identified. In the forearc basin sediments of Unit A, high concentrations of detrital magnetic iron oxides in surface sediments give way to progressive diagenetic dissolution with depth. Nevertheless, large titanomagnetite particles survived diagenetic dissolution along with magnetic nanoinclusions within host silicates that preserve a relict magnetic signal that records climatic modulation of sediment delivery to the Kumano Basin. The authigenic iron sulphides, ferrimagnetic greigite and paramagnetic pyrite, formed in association with gas hydrates and anaerobic oxidation of methane in the forearc basin sediments of Unit B. Methane venting from deeper within the slope sediments of Unit C and accretionary prism sediments of Unit D has given rise to formation of pyrite aggregates along sediment fractures and has contributed to further diagenetic depletion of magnetic signals in these units. Structural evolution of the Kumano Basin has caused migration of the gas hydrate stability zone (GHSZ) through time so that the Site C0002 sediments record both the present and fossil GHSZ positions. Magnetic properties of Kumano Basin sediments provide insights into the interplay between diagenetic, climatic, and tectonic processes that controlled the sedimentary evolution of this forearc basin.
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DOI：
10.2204/iodp.sd.2.06.2006
发表时间：
2006
期刊：
--
影响因子：
--
作者：
H. Tobin;M. Kinoshita
通讯作者：
H. Tobin;M. Kinoshita
影响因子：
2.8
作者：
Muxworthy, AR;McClelland, E
通讯作者：
McClelland, E
影响因子：
2.3
作者：
K. Hilgenfeldt
通讯作者：
K. Hilgenfeldt
影响因子：
5
作者：
N. Riedinger;Kerstin Pfeifer;S. Kasten;J. Garming;C. Vogt;C. Hensen
通讯作者：
N. Riedinger;Kerstin Pfeifer;S. Kasten;J. Garming;C. Vogt;C. Hensen
影响因子：
5.3
作者：
J. Larrasoaña;A. Roberts;R. Musgrave;E. Gràcia;E. Piñero;M. Vega;F. Martínez-Ruiz
通讯作者：
J. Larrasoaña;A. Roberts;R. Musgrave;E. Gràcia;E. Piñero;M. Vega;F. Martínez-Ruiz