Physical Properties of Near-Surface Sediments at Southern Hydrate Ridge: Results from ODP Leg 204
Physical Properties of Near-Surface Sediments at Southern Hydrate Ridge: Results from ODP Leg 204
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DOI：
10.2973/odp.proc.sr.204.104.2006
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
M. Riedel;P. Long;Char‐Shine Liu;P. Schultheiss;T. Collett
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文献类型：
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作者：
M. Riedel;P. Long;Char‐Shine Liu;P. Schultheiss;T. Collett
在位于俄勒冈州近海水合物脊南部的Leg 204站点，进行了10-20米上层物理性质的详细测量，以表征近地表沉积物的物理性质。测量包括纵波速度、磁化率、密度、孔隙度、电阻率和抗剪强度。在站点1244、1245和1246，也使用Hamilton框架测定了分离式岩心的纵波速度。在1244、1245、1246、1247、1248和1252地点，使用Geotek公司的新型非接触电阻率工具测量了整个岩心的电阻率，作为多传感器轨迹岩心测井的一部分。然后利用这些数据通过水分和密度测量来计算孔隙度，并利用阿奇关系建立适当的传递函数。该数据集很重要，因为由于井眼条件差，只能在上部10-20米获得有限的可靠测井数据。斜坡盆地1251和1252站点沉积物孔隙度最高，在海底以下5 m以上的孔隙度约为75%。在所有其他位置孔隙率通常低~10%。对比了孔隙度剖面的纵波速度和沉积物抗剪强度。1244、1245和1246站点近地表沉积物明显过固结。在Site 1251，没有观察到这种过度固结。1244、1245和1246位于水合物山脊南部背斜的两侧，可能已经暴露在侵蚀中，而1251和1252位于盆地东部，有1Riedel， M., Long， P., Liu, c.s., Schultheiss， P., Collett， T.和ODP Leg 204 Shipboard Scientific Party， 2006。南部水合物脊近地表沉积物的物理性质：ODP Leg 204的结果。在tracimhu， a.m., Bohrmann， G., Torres, m.e.和Colwell， F.S.（主编），Proc. ODP, Sci.。结果，2004,1 - 29[在线]。可从万维网：。[引用日期：YYYYMM-DD] 2加拿大自然资源部，加拿大太平洋地质调查局，西萨尼奇路9860号，邮编：6000，BC悉尼V8L 4B2。3现地址：加拿大蒙特利尔大学街3450号，麦吉尔大学地球与行星科学系，QC H3A 2A7。mriedel@eps.mcgill.ca 4太平洋西北实验室，邮编999，美国华盛顿州里奇兰993525国立台湾大学海洋研究所，台北106邮政信箱23-13 . 6Geotek有限公司，3 Faraday Close, Drayton Fields, Daventry, Northants nn115rd . 7美国地质调查局丹佛联邦中心，MS-939，美国丹佛80225首次接收：2004年12月27日接受：2006年4月4日网络出版：2006年8月3日Ms 204SR-104 M. RIEDEL ET AL。近地表沉积物的物理性质2由于浊积岩沉积而大大提高了最近的沉积速率。
At the Leg 204 sites located on southern Hydrate Ridge, offshore the Oregon margin, detailed measurements of physical properties in the upper 10–20 m were carried out to characterize the physical nature of the near-surface sediments. Measurements included P-wave velocity, magnetic susceptibility, density, porosity, electrical resistivity, and shear strength. At Sites 1244, 1245, and 1246, P-wave velocity was also determined on the split cores using the Hamilton frame. Electrical resistivity was measured with the new noncontact resistivity tool from Geotek on whole cores as part of multisensor track core logging at Sites 1244, 1245, 1246, 1247, 1248, and 1252. These data were then used to calculate porosity using moisture and density measurements to develop appropriate transfer functions by using Archie’s relation. This data set is important because only limited reliable logging data were obtained in the upper 10–20 m as a result of poor borehole conditions. Sediment porosities appear to be highest at Sites 1251 and 1252 in the slope basin, with values of ~75% in the upper 5 m below seafloor. Porosity is generally ~10% lower at all other sites. Porosity profiles were compared with P-wave velocity and sediment shear strength. Apparent overconsolidation of near-surface sediments was observed at Sites 1244, 1245, and 1246. At Site 1251, no such overconsolidation is observed. Sites 1244, 1245, and 1246 are located on the flanks of the anticline at southern Hydrate Ridge and have probably been exposed to erosion, whereas Sites 1251 and 1252, which are located in the eastward basin, have a 1Riedel, M., Long, P., Liu, C.S., Schultheiss, P., Collett, T., and ODP Leg 204 Shipboard Scientific Party, 2006. Physical properties of nearsurface sediments at southern Hydrate Ridge: results from ODP Leg 204. In Tréhu, A.M., Bohrmann, G., Torres, M.E., and Colwell, F.S. (Eds.), Proc. ODP, Sci. Results, 204, 1–29 [Online]. Available from World Wide Web: . [Cited YYYYMM-DD] 2Natural Resources Canada, Geological Survey of Canada–Pacific, 9860 West Saanich Road, PO Box 6000, Sidney BC V8L 4B2, Canada. 3Present address: Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal QC H3A 2A7, Canada. mriedel@eps.mcgill.ca 4Pacific Northwest Laboratory, PO Box 999, Richland WA 99352, USA. 5Institute of Oceanography, National Taiwan University, PO Box 23-13, Taipei 106, Taiwan. 6Geotek Ltd., 3 Faraday Close, Drayton Fields, Daventry, Northants NN11 5RD, United Kingdom. 7US Geological Survey Denver Federal Center, Box 25046, MS-939, Denver CO 80225, USA. Initial receipt: 27 December 2004 Acceptance: 4 April 2006 Web publication: 3 August 2006 Ms 204SR-104 M. RIEDEL ET AL. PHYSICAL PROPERTIES OF NEAR-SURFACE SEDIMENTS 2 much higher recent sedimentation rate as a result of turbidite deposition.