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    伸展作用下郯庐断裂带南段及邻区的地壳演化:来自接收函数的证据

    陈昊 李红星 洪德全 韩如冰 王向腾 邓居智 李广 宫猛 黄光南 盛书中

    陈昊, 李红星, 洪德全, 韩如冰, 王向腾, 邓居智, 李广, 宫猛, 黄光南, 盛书中, 2023. 伸展作用下郯庐断裂带南段及邻区的地壳演化:来自接收函数的证据. 地球科学, 48(8): 2905-2914. doi: 10.3799/dqkx.2022.055
    引用本文: 陈昊, 李红星, 洪德全, 韩如冰, 王向腾, 邓居智, 李广, 宫猛, 黄光南, 盛书中, 2023. 伸展作用下郯庐断裂带南段及邻区的地壳演化:来自接收函数的证据. 地球科学, 48(8): 2905-2914. doi: 10.3799/dqkx.2022.055
    Chen Hao, Li Hongxing, Hong Dequan, Han Rubing, Wang Xiangteng, Deng Juzhi, Li Guang, Gong Meng, Huang Guangnan, Sheng Shuzhong, 2023. Crustal Tectonic Evolution of Tanlu Fault Zone (Southern Segment) and Adjacent Areas under the Background of Extension: Evidences from Teleseismic Receiver Function. Earth Science, 48(8): 2905-2914. doi: 10.3799/dqkx.2022.055
    Citation: Chen Hao, Li Hongxing, Hong Dequan, Han Rubing, Wang Xiangteng, Deng Juzhi, Li Guang, Gong Meng, Huang Guangnan, Sheng Shuzhong, 2023. Crustal Tectonic Evolution of Tanlu Fault Zone (Southern Segment) and Adjacent Areas under the Background of Extension: Evidences from Teleseismic Receiver Function. Earth Science, 48(8): 2905-2914. doi: 10.3799/dqkx.2022.055

    伸展作用下郯庐断裂带南段及邻区的地壳演化:来自接收函数的证据

    doi: 10.3799/dqkx.2022.055
    基金项目: 

    国家自然科学基金 41764006

    江西省自然科学基金 20202BABL201027

    “核资源与环境”国家重点实验室自主基金 Z1903

    江西省研究生创新专项资金项目 YC2021⁃B159

    详细信息
      作者简介:

      陈昊(1988-),工程师,博士生在读,接收函数及层析成像应用研究.ORCID:0000-0002-1926-4415. E-mail:chenhaohome@vip.qq.com

      通讯作者:

      李红星,E-mail: lihongxingniran@163.com

    • 中图分类号: P315.2

    Crustal Tectonic Evolution of Tanlu Fault Zone (Southern Segment) and Adjacent Areas under the Background of Extension: Evidences from Teleseismic Receiver Function

    • 摘要: 为了更加深入了解中生代白垩世以后大陆伸展对郯庐断裂带南段地壳结构和演化的影响.利用P波接收函数对郯庐断裂带南段及其邻区的地壳厚度、泊松比特征进行研究.H⁃κ结果显示研究区域内的下扬子板块地壳厚度相对于华北板块更薄,并且结构变化更加剧烈,大别山造山带和苏鲁造山带之间的郯庐断裂带所在区间的平均泊松比呈现出相对低值特征.P波接收函数叠后偏移结果显示郯庐断裂带下方的地壳表现为减薄形变,且断裂带两侧地壳向郯庐断裂带处发生减薄的倾角不同.结合区域地质演化背景,认为“非对称伸展”模型可以解释早白垩世伸展作用下郯庐断裂带南段及其邻区的地壳形变及演化特征.

       

    • 图  1  台站及地震事件分布、区域地质构造图

      a.宽频带地震台站分布;b.研究区地质构造简图;c.地震事件震中分布;SLOB. 苏鲁造山带;DBOB. 大别山造山带;MLYRMB. 长江中下游成矿带;NCP. 华北平原;JBB. 苏北盆地;HFB. 合肥盆地;F1. 郯庐断裂带;F2. 江山-绍兴断裂;F3. 淮阴-响水口断裂;F4. 信阳-六安断裂;F5. 襄樊-广济断裂

      Fig.  1.  Station and epicenter distribution, and regional geological structure map

      图  2  AH.CHZ台提取的接收函数

      a. AH.CHZ平均接收函数;b. AH.CHZ接收函数排列;c. AH.CHZ接收函数对应地震事件反方位角(红色方块)震中距(黑色倒三角)

      Fig.  2.  The P⁃RFs from AH.CHZ

      图  3  地壳厚度和区域泊松比特征

      Fig.  3.  The crustal thickness and the regional Poission's ratio feature

      图  4  接收函数叠后偏移剖面图

      a.6个宽频带台站分布及射线在地下的穿透点;b.120条接收函数(每个台站随机抽取20条);c.叠后偏移成像结果

      Fig.  4.  The profile of RF poststack migration

      图  5  非对称伸展模型

      a. 挤压走滑阶段;b.巨型伸展阶段;依据嵇少丞等(2009)牛漫兰等(2010)的地壳演化模型修改

      Fig.  5.  The model named Isothermal surface raising and Asymmetrical extension

      表  1  每个台站对应的地壳厚度、Vp/Vs波速比及平均泊松比

      Table  1.   Crustal thickness, Vp/Vs and average Poisson's ratio under every station By H⁃κ

      构造单元 台站编号 地壳厚度
      (km)
      波速比(κ)
      Vp/Vs
      泊松比(σ)
      华北板块 华北平原 JS.PX 32.4 1.77 0.27
      JS.XZ 33.2 1.78 0.26
      JS.PZ 32.8 1.75 0.26
      AH.HBE 34.4 1.78 0.27
      AH.MCG 31.6 1.74 0.25
      AH.HNA 33.6 1.77 0.26
      AH.BEB 31.2 1.72 0.25
      AH.DYN 35.8 1.65 0.21
      合肥盆地 AH.BAS 34.4 1.65 0.21
      AH.SCH 35.4 1.74 0.25
      大别造山带 AH.FZL 36.6 1.77 0.26
      AH.JZA 35.2 1.71 0.24
      下扬子板块 苏鲁造山带 JS.DH 31.2 1.71 0.24
      JS.XW 32.2 1.74 0.25
      JS.GUY 25.6 1.86 0.30
      JS.HUA 28.6 1.78 0.27
      JS.SQ 32.2 1.75 0.26
      JS.SH 31.6 1.80 0.28
      苏北盆地 JS.SY 28.8 1.74 0.25
      JS.YC 29.9 1.73 0.25
      JS.DF 32.0 1.73 0.25
      JS.GY 31.6 1.74 0.26
      沿江中下游成矿带 JS.HA 28.8 1.75 0.26
      AH.JAS 30.2 1.77 0.27
      JS.LH 25.0 1.88 0.30
      AH.CHZ 32.2 1.72 0.25
      JS.JJ 36.4 1.64 0.22
      JS.ZJ 33.6 1.72 0.25
      JS.RD 30.9 1.70 0.24
      JS.WX 31.6 1.77 0.27
      JS.GC 30.4 1.77 0.26
      AH.MAS 31.8 1.75 0.26
      JS.NJ 30.9 1.70 0.24
      JS.LIS 30.0 1.78 0.27
      AH.ANQ 33.2 1.74 0.25
      AH.TOL 34.0 1.74 0.25
      华南褶皱系 AH.HUS 35.4 1.75 0.26
      下载: 导出CSV
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