Origin of multiple flat tables on Caiwei Guyots in West Pacific
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摘要:
基于“海洋六号”实测的全覆盖多波束数据，分析了西太平洋麦哲伦海山链采薇平顶海山群的多级山顶平台地形特征，并结合2015年最新采集的浅剖数据探讨了多级山顶平台成因。多波束数据显示海山群的山顶平台水深为1350~1735m，发育多级山顶平台，平台高差为300~450m。浅剖资料表明海山群山顶平台的沉积物厚度为35~100m。除掉沉积物的厚度差，多级山顶平台的基底依然存在200m以上的高差，说明沉积物厚度的不均一并非是形成多级山顶平台的主要原因。通过对比海山群多级山顶平台地形特征与南海甘泉海台及永暑礁多级水下阶地特征，否定了海平面相对变化是形成海山群多级山顶平台的主要原因。山顶平台周缘发育的碳酸盐岩表明海山曾经位于浅水环境，不同山顶平台的基底应该曾经均位于同一海平面位置，多级山顶平台很可能由垂直相对运动产生。结合区域地质背景和地形特征，认为海山群发育两条西北向正断裂，其中一条断裂倾向东北，另一条断裂倾向西南。
Abstract:Multi-beam bathymetric data suggests a special topographic feature on the Caiwei Guyots in the West Pacific. The sub-bottom profile data obtained in 2015 by R/V "HAI YANG LIU HAO" suggests that there are several flat tables developed on the top of guyots at the water depths ranging 1350-1735m. The difference in water depth between the flat tables is around 300-450m. Sub-bottom profile suggests that the sediment on the top of guyots is 35-100m thick. Taking the sediment thickness out of consideration, the water depth difference between flat table basements still exceeds 200m, which means that the difference of sediment thickness is not the main reason causing the multi-tables. Through comparison of topographic features among the Caiwei Guyots, Ganquan terrace and Yongshu Reef in the South China Sea, it is discovered that the relative sea-level change is not the main reason to cause the multi-tables either. Carbonate deposits are found in the fringes of the tables, which indicates that the guyots were close to the sea level when the flat top was formed. It is then deduced that the multi-tables are probably generated by vertical tectonic movement within the region of Caiwei Guyots. According to topographic features and local geological background, there are probably two northwest normal faults in the Caiwei Guyots, which caused vertical tectonic movement and the formation of multi-tables. One of the faults dips to northeast and the other to southwest.
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Key words:
- flat tables /
- multi-beam bathymetric data /
- sub-bottom profile /
- Caiwei Guyots
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表 1 采薇平顶海山群的地形和浅剖特征统计
Table 1. Topographic features and sediment thickness of Caiwei Guyots
名称 水深/m 地形高差/m 面积/km2 坡度/(°) 最大沉积物
厚度/m沉积物
厚度差/m采薇主山顶平台 1350 0 1940 < 0.3 100 0 采薇次山顶平台 1735 385 60 1.5 37 63 采杞山顶平台 1800 450 153 - 40 60 备注：地形高差和沉积物厚度差指与采薇主山顶平台相比较的结果. 
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[1] 章伟艳, 张富元, 朱克超, 等.西太平洋海域海山地形分形特征研究[J].现代地质, 2009, 23(6):1138-1146 doi: 10.3969/j.issn.1000-8527.2009.06.020
ZHANG Weiyan, ZHANG Fuyuan, ZHU Kechao, et al. Fractal research on seamount topography in the West Pacific Ocean[J]. Geoscience, 2009, 23(6):1138-1146 doi: 10.3969/j.issn.1000-8527.2009.06.020
[2] 张国祯, 张子健.西太平洋海底平顶山研究[J].海洋地质与第四纪地质, 2001, 21(1):19-24 http://d.old.wanfangdata.com.cn/Periodical/hydzydsjdz200101004
ZHANG Guozhen, ZHAN G Zijian. Investigation of guyots in the Western Pacific Ocean[J]. Marine Geology & Quaternary Geology, 2001, 21(1):19-24 http://d.old.wanfangdata.com.cn/Periodical/hydzydsjdz200101004
[3] 章伟艳, 张富元, 胡光道, 等.中西太平洋海山形态类型与钴结壳资源分布关系到[J].海洋学报, 2008, 30(6):76-84 http://www.cnki.com.cn/Article/CJFDTotal-SEAC200806008.htm
ZHANG Weiyan, ZHANG Fuy uan, HU Guangdao, et al. Relationship between shape classification of Pacific seamount morphology and distribution of cobalt-rich crust resources[J]. Acta Oceanologica Sinica, 2008, 30(6):76-84 http://www.cnki.com.cn/Article/CJFDTotal-SEAC200806008.htm
[4] 朱本铎, 梁德华, 崔兆国.西太平洋麦哲伦海山链的海山地貌及成因[J].中南大学学报, 2011, 42(2):92-98
ZHU Benduo, LIANG Dehua, CUI Zhaoguo. Geomorphologic characteristics and genesis of Magelan seamount chain in the western Pacific[J]. Journal of Central South University (Science and Technology), 2011, 42(2):92-98
[5] 石学法, 任向文, 刘季花, 等.富钴铁锰结壳的控矿要素和成矿过程——以西太平洋为例[J].矿物岩石地球化学通报, 2008, 27(3):232-23 doi: 10.3969/j.issn.1007-2802.2008.03.004
SHI Xuefa, Ren Xiangwen, Liu Jihua, et al.Ore-controlling factors and ore-forming processes of Co-rich Fe-Mn crust:An example from Western Pacific[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2008, 27(3):232-238 doi: 10.3969/j.issn.1007-2802.2008.03.004
[6] 石学法, 任向文, 刘季花.太平洋海山成矿系统与成矿作用过程[J].地学前缘(中国地质大学), 2009. 16(6):55-65 http://d.old.wanfangdata.com.cn/Periodical/dxqy200906006
SHI Xuefa, Ren Xiangwen, Liu Jihua. Ferromanganese metallogenic system and ore-forming processes of seamounts in the Pacific[J]. Earth Science Frontiers, 2009, 16(6):55-65 http://d.old.wanfangdata.com.cn/Periodical/dxqy200906006
[7] 马维林, 杨克红, 包更生, 等.中太平洋海山富钴结壳成矿的空间分布规律研究[J].海洋学报, 2014, 36(7):77-89 doi: 10.3969/j.issn.0253-4193.2014.07.009
MA Weilin, YANG Kehong, BAO Gengsheng, et al. Spatial distribution study of cobalt-rich crusts ore formation on the Central Pacific Seamount[J]. Acta Oceanologica Sinica, 2014, 36(7):77-89 doi: 10.3969/j.issn.0253-4193.2014.07.009
[8] Clouard V, Bonneville A, Gillot P Y. A giant landslide on the southern flank of Tahiti Island, French Polynesia[J]. Geophysical Research Letters, 2001, 28(11):2253-2256 doi: 10.1029/2000GL012604
[9] Masson D G, Watts A B, Gee M J R, et al. Slope failures on the flanks of the western Canary Islands[J]. Earth-Science Reviews, 2002, 57: 1-35 doi: 10.1016/S0012-8252(01)00069-1
[10] Mitchell N C. Transition from circular to stellate forms of submarine volcanoes[J]. Journal of Geophysical Research, 2001, 106(B2):1987-2003 doi: 10.1029/2000JB900263
[11] Haggerty J A, Premoli S I, Rack F, et al. Proceedings of Ocean Drilling Program, Scientific Results, 144[M].College station, TX(Ocean Drilling Program), 1995
[12] Larson R L, Lancelot Y, et al. Proceedings of Ocean Drilling Program, Scientific Results, 129, College station, TX(Ocean Drilling Program)[C]. 1992.
[13] Koppers A A P, Staudigel H, Wijbrans J R, et al. The Magellan seamount trail: implications for Cretaceous hotspot volcanism and absolute Pacific plate motion[J]. Earth and Planetary Science Letters, 1998, 163: 53-68 doi: 10.1016/S0012-821X(98)00175-7
[14] Koppers A A P, Staudigel H, Pringle M S, et al. Short-lived and discontinuous intraplate volcanism in the South Pacific: Hot spots or extensional volcanism?[J]. Geochemistry Geophysics Geosystems, 2003, doi.org/10.1029/2003GC000533
[15] 赵俐红, 金翔龙, 高金耀.麦哲伦海山链漂移史及可能的来源[J].海洋学报, 2010, 32(3):60-66 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=hyxb201003008
ZHAO Lihong, JIN Xianglong, GAO Jinyao, et al. The research on the drifting history and possible origin of the Magellan seamount trail[J]. Acta Oceanologica Sinica, 2010, 32(3):60-66 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=hyxb201003008
[16] Gordon R G. Late Cretaceous apparent polar wander of the Pacific Plate: Evidence for a rapid shift of the Pacific hotspots with respect to the spin axis[J]. Geophysical Research Letters, 2013, 10(8):709-712 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/GL010i008p00709
[17] Duncan R A, Clague D A. Pacific plate motion recorded by linear volcanic chains[M]//The Ocean Basins and Margins: the Pacific Ocean7A.NewYork:PlenumPress, 1985:89-121
[18] Hildebrand J A, Parker R L. Paleomagnetism of Cretaceous Pacific seamounts revisited[J]. Geophys. Res., 1987, 92:12695-12712 doi: 10.1029/JB092iB12p12695
[19] Clouard V, Bonneville A. Ages of seamounts, islands and plateaus on the Pacific Plate[C]// Foulger G R, Natland J H, Presnall D C, Anderson D L (Eds). Plates, Plumes, and Paradigms. Geological Society of America Special Volume 388.2005: 71-90.
[20] 张江勇, 黄文星, 刘胜旋, 等.南海西沙海域甘泉海台的阶梯状地形[J].热带地理, 2016, 36(1):10-18 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=rddl201601003
ZHANG Jiangyong, HUANG Wenxing, LIU Shengxuan, et al.Terrace topography of the Ganquan Plateau in the Xisha Area of the South China Sea[J].Tropical Geography, 2016, 36(1):10-18 http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=rddl201601003
[21] 中国科学院南沙综合科学考察队.南沙群岛永暑礁第四纪珊瑚礁地质[M].北京:海洋出版社, 1992
Nansha Comprehensive Survey Team of Chinese Academy of Sciences. Quaternary Coral Reef Geology of Yongshu Reef in Nansha Qundao[M]. Beijing: Ocean Press, 1992
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