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    中西太平洋海山区的岩石圈有效弹性厚度及其地质意义

    赵俐红 金翔龙 高金耀 李家彪 初凤友

    赵俐红, 金翔龙, 高金耀, 李家彪, 初凤友, 2010. 中西太平洋海山区的岩石圈有效弹性厚度及其地质意义. 地球科学, 35(4): 637-644. doi: 10.3799/dqkx.2010.078
    引用本文: 赵俐红, 金翔龙, 高金耀, 李家彪, 初凤友, 2010. 中西太平洋海山区的岩石圈有效弹性厚度及其地质意义. 地球科学, 35(4): 637-644. doi: 10.3799/dqkx.2010.078
    ZHAO Li-hong, JIN Xiang-long, GAO Jin-yao, LI Jia-biao, CHU Feng-you, 2010. The Effective Elastic Thickness of Lithosphere in the Mid-West Pacific and Its Geological Significance. Earth Science, 35(4): 637-644. doi: 10.3799/dqkx.2010.078
    Citation: ZHAO Li-hong, JIN Xiang-long, GAO Jin-yao, LI Jia-biao, CHU Feng-you, 2010. The Effective Elastic Thickness of Lithosphere in the Mid-West Pacific and Its Geological Significance. Earth Science, 35(4): 637-644. doi: 10.3799/dqkx.2010.078

    中西太平洋海山区的岩石圈有效弹性厚度及其地质意义

    doi: 10.3799/dqkx.2010.078
    基金项目: 

    国家海洋局第二海洋研究所基本科研业务费专项资助 JB0701

    山东省教育厅科技计划项目 J08LB53

    详细信息
      作者简介:

      赵俐红(1976-), 女, 博士后, 从事海洋地球物理与构造地质研究.E-mail: zhaolih751225@163.com

    • 中图分类号: P541;P631

    The Effective Elastic Thickness of Lithosphere in the Mid-West Pacific and Its Geological Significance

    • 摘要: 中西太平洋海山区是太平洋板块上洋壳年龄最老、磁条带异常最复杂、海山分布最密集、地质构造最独特、构造活动最强烈的一个区域, 为探讨区内众多海山的构造成因, 以板块构造理论为指导运用弹性板挠曲理论计算了中西太平洋海山区岩石圈的有效弹性厚度.结果显示, 研究区的有效弹性厚度总体上表现为北西高南东低的趋势, 西边的麦哲伦海山链表现出南北低中间高的趋势, 东边的中太平洋海山群呈现出由西往东厚度递减的现象, 且这2个典型区域的岩石圈有效弹性厚度与现今法属玻利尼西亚群岛处的比较接近.据此推测它们是在白垩纪期间(约130~90 Ma)形成于现今法属玻利尼西亚群岛处的大规模热点群附近, 且受到了后期火山岩浆活动的改造作用.

       

    • 图  1  中西太平洋海山区地形

      Fig.  1.  Topography of the Mid-West Pacific seamount region

      图  2  研究区12个区块划分

      Fig.  2.  Twelve blocks of the study region

      表  1  模型计算中用到的参数

      Table  1.   Parameters used by the flexural model

      参数 定义 值/单位
      w(x) 板块挠曲 m
      D 挠曲刚度 N·m
      Te 有效弹性厚度 m
      ρw 海水密度 1 025 kg/m3
      ρc 洋壳密度 2 800 kg/m3
      ρm 地幔密度 3 330 kg/m3
      g 重力加速度 9.82 m·s-2
      E 杨氏模量 6.5×1010 Pa
      υ 泊松比 0.25
      D=ETe3/12(1-υ2).
      下载: 导出CSV

      表  2  剖面计算结果

      Table  2.   Calculation result of nine profiles

      剖面 起点经度(°) 起点纬度(°) 终点经度(°) 终点纬度(°) Te(km) 均方根
      剖面1 184.30 19.70 186.20 16.0 7 0.582 2
      剖面2 182.20 19.50 179.70 16.8 6 0.444 3
      剖面3 178.50 18.80 178.50 15.8 7 0.398 1
      剖面4 176.33 22.34 176.63 13.6 11 0.507 8
      剖面5 176.60 23.00 169.60 16.4 11 0.527 8
      剖面6 151.00 21.20 149.00 19.1 15 0.842 7
      剖面7 153.50 19.20 149.20 18.2 16 0.530 9
      剖面8 154.00 17.90 150.50 15.3 14 0.765 9
      剖面9 156.40 16.60 153.90 13.8 17 0.397 8
      下载: 导出CSV

      表  3  研究区各区块Te

      Table  3.   Te of twelve blocks in the study region

      区块 1 2 3 4 5 6
      Te(km) 16.0 6.0 32.0 17.0 10.2 5.0
      均方根 0.079 5 0.092 5 0.122 2 0.113 7 0.129 2 0.094 9
       
      区块 7 8 9 10 11 12
      Te(km) 17.0 6.5 8.5 16.0 15.0 10.0
      均方根 0.091 4 0.099 5 0.081 5 0.089 4 0.118 2 0.052 6
      下载: 导出CSV

      表  4  中太平洋海山群7座海山的Te

      Table  4.   Te of seven seamounts in the Mid-Pacific Mountain

      海山 经度(°) 纬度(°) Te(km) 均方根
      Darwin 171.6 22.0 4.5 0.128 6
      Heezen 173.8 21.2 4.0 0.265 0
      Resolution 174.5 21.2 11.0 0.243 2
      Stetson 176.1 19.6 8.0 0.178 3
      Jacqueline 176.7 19.4 7.5 0.193 4
      Allison 180.3 18.5 4.5 0.282 1
      Renard 184.0 17.8 4.0 0.299 4
      下载: 导出CSV

      表  5  麦哲伦海山链6座海山的Te

      Table  5.   Te of six seamounts in the Magellan seamount trail

      海山 经度(°) 纬度(°) Te(km) 均方根
      Himu 151.78 21.50 7.5 0.115 3
      Hemler 151.70 19.70 15.0 0.165 3
      Vlinder 154.30 17.12 16.5 0.165 5
      Pako 155.10 15.70 21.0 0.172 6
      Ioah 155.90 14.15 23.0 0.182 4
      Ita Mai Tai 156.70 13.00 19.0 0.215 1
      下载: 导出CSV

      表  6  研究区13座海山的ΔTe

      Table  6.   ΔTe of thirteen seamounts in the study region

      海山 T1(Ma) T2(Ma) t(Ma) Te1(km) Te2(km) ΔTe(km) H1(m) H2(m) ΔH(m)
      Himu 160.78 119.67 41.11 ~17.3 10.0 7.3 -5 887.7 -6 938.1 1 050.4
      Hemler 162.12 99.99 62.13 ~21.3 15.0 6.3 -5 815.7 -6 956.4 1 140.7
      Vlinder 165.94 94.13 71.81 ~22.9 16.5 6.4 -5 909.4 -7 008.6 1 099.2
      Pako 166.66 92.00 74.66 ~23.3 21.0 2.3 -6 194.3 -7 018.4 824.1
      Ioah 162.97 86.50 76.47 ~23.6 23.0 0.6 -6 544.4 -6 968.1 423.7
      Ita Mai Tai 159.93 116.90 43.03 ~17.7 19.0 -1.3 -6 296.4 -6 926.2 629.8
      Darwin 152.46 119.00 33.46 ~15.6 4.5 11.1 -5 879.2 -6 821.6 942.4
      Heezen 150.69 123.10 27.59 ~14.2 4.0 10.2 -5 155.8 -6 796.5 1 640.7
      Resolution 150.33 127.60 22.73 ~12.9 11.0 1.9 -4 055.5 -6 791.4 2 735.9
      Stetson 142.46 98.50 43.96 ~17.9 8.0 9.9 -3 802.5 -6 677.4 2 874.9
      Jacqueline 138.69 98.50 40.19 ~17.1 7.5 9.6 -4 313.9 -6 621.8 2 307.9
      Allison 124.87 101.20 23.67 ~13.1 4.5 8.6 -4 927.1 -6 411.0 1 483.9
      Renard 119.76 88.50 31.26 ~15.1 4.0 11.1 -4 832.2 -6 330.2 1 498.0
      下载: 导出CSV

      表  7  研究区6座海山的古纬度研究情况(Wilson et al., 1998)

      Table  7.   Paleolatitude of six seamounts in the study region

      平顶海山 年龄(Ma) 古纬度(°)
      Limalok
      Initiation ~57.5±2.5 10.80±2.50S
      Drowning ~48.0±2 8.15±2.75S
      Present 5.55N
      Wodejebato
      Initiation ~76±1 11.60±3.20S
      Drowning ~69±1 6.20±2.20S
      Present 11.90N
      MIT
      Initiation ~119±2 11.55±3.45S
      Drowning ~101±2 8.35±3.35S
      Present 27.30N
      Takuyo-Daisan
      Initiation ~118±2 4.80±3.50S
      Drowning ~111±2 3.40±3.50S
      Present 34.15N
      Allison
      Initiation ~111±2 13.00±3.30S
      Drowning ~99±2 11.75±3.25S
      Present 18.45N
      Resolution
      Initiation ~128±2 14.50±3.30S
      Drowning ~99±2 10.70±3.30S
      Present 21.35N
      下载: 导出CSV
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