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首页> 外文期刊>Quaternary geochronology >Using in situ-produced Be-10 to constrain the age of the latest surface-rupturing earthquake along the Middle Kedrovaya fault (Baikal rift)
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Using in situ-produced Be-10 to constrain the age of the latest surface-rupturing earthquake along the Middle Kedrovaya fault (Baikal rift)

机译：使用原位生产的BE-10限制了沿着中间Kedrovaya故障（Baikal Rift）的最新表面破裂地震年龄

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摘要

The 30-km-long Middle Kedrovaya (MK) fault, on the northwestern flank of Lake Baikal, is one of the most impressive late Quaternary seismogenic structures in the Baikal rift. In places, surface fault scarps expose striated bedrock fault planes and offer some opportunities to examine the faulting history. Using cosmogenic Be-10 exposure dating, we measured the exposure ages of one of the MK scarps (54.44630 degrees N, 108.51524 degrees E, elevation 985 m). This similar to 12-m-high normal fault scarp is composed of cataclasites in early Proterozoic granitoids of the Irel complex. We analyzed 12 of 18 samples, collected every 0.5 m, from 0.45 m above the toe of the exposed fault plane, which dips 55 degrees in its lower half (samples 1-6) and 45 degrees in upper half (samples 7-12). Exposure ages are the following from the toe upward: sample 1, 2.26 +/- 0.53 ka; 2, 1.54 +/- 0.55 ka; 3, 0.80 +/- 0.55 ka; 5, 1.44 +/- 0.55 ka; 6, 2.13 +/- 0.62 ka; 8, 1.45 +/- 0.48 ka; and 9, 1.40 +/- 0.52 ka. The relationship between the oldest calculated ages (samples 1 and 6) and the relative sampling height along the scarp suggests that a recent surface-rupture event with a vertical component of 2.05 m (i.e. net slip of 2.5 m) occurred on the cliff similar to 2.2 +/- 0.6 ka. Striations on the fault plane in the sampling points 1 and 6, as well a close date of 2145-2463 cal years BP calculated from radiocarbon age of a paleoseismic rupture within the Cape Shartly, similar to 62 km further southwestward, support this interpretation. The close ages assume that the dated deformations were related to a single M-w = 7.4 earthquake, the coseismic effects of which extended at least 82 km (the rupture length between the Cape Shartly and the NNE termination of the MK paleoseismic rupture zone). A more concentrated age mode of about 1.46 +/- 0.53 ka (samples 2, 5, 8 and 9), which is in an incorrect stratigraphic order in reference to the older ages, is assumed to result from local erosion or partial shielding. Cosmogenic dating of fault scarps and seismogenic landslide scarps in bedrock potentially offers an independent method of reconstructing the late Quaternary paleoseismology of the northwestern flank of Lake Baikal.
机译：在贝加尔湖的西北部侧翼的30公里长的中间Kedrovaya（MK）故障是贝加尔河裂谷中最令人印象深刻的季度季度发震结构之一。在地点，表面故障稀斯普斯暴露横发的基岩故障飞机，并提供一些机会来检查故障历史。使用宇宙原性BE-10曝光约会，我们测量了一个MK SciS的曝光年龄（54.44630度N，108.51524度，高度985米）。类似于12米高的正常故障围巾是由塞尔复合体的早期正古代花岗岩中的Cataclasites组成。我们分析了12个样品中的12个样品，每0.5米收集，从曝光断层平面的脚趾上方0.45米，其下半部分（样品1-6）和45度在上半杆（样品7-12）中倾斜55度（样品7-12） 。曝光年龄从脚趾上方是下面的：样品1,2.26 +/- 0.53 ka; 2,1.54 +/- 0.55 ka; 3,0.80 +/- 0.55 ka; 5,1.44 +/- 0.55 ka; 6,2.13 +/- 0.62 ka; 8,1.45 +/- 0.48 ka;和9,1.40 +/- 0.52 ka。沿着围巾的最旧的计算年龄（样本1和6）和相对采样高度之间的关系表明，最近的表面破裂事件与2.05米的垂直部件（即2.5米的净滑移）发生在类似于的悬崖上2.2 +/- 0.6 ka。采样点1和6中断层平面的条纹，近日日期，从海角内的古摆破裂的古姿态破裂计算的近日，类似于西北62公里，支持这种解释。近年来假设日期的变形与单一M-W = 7.4地震有关，其电影症效应延伸至少82 km（披着港之间的破裂长度和MK古姿态破裂区的NNE终止）。在参考年龄较旧的年龄的情况下，以较旧的年龄呈现不正确的地层顺序，更浓缩的年龄模式为约1.46 +/- 0.53ka（样品2,5,8和9），以引起局部侵蚀或部分屏蔽。 Batrock中出现故障稀释和地震滑坡围巾的宇宙发生约会可能是重建贝加尔湖西北侧面的后期季度古摆学的独立方法。

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  • 来源
    《Quaternary geochronology》 |2020年第2020期|共8页
  • 作者

    Lunina Oksana; Li Dewen; Lyu Yanwu; Wang Youpeng; Li Ming; Gao Yu; Gladkov Andrei; Denisenko Ivan; Gladkov Anton; Wang Keqiang; Zhang Shimin; Perevoznikov Dmitrii;

  • 作者单位

    Russian Acad Sci Inst Earths Crust Siberian Branch Lermontova St 128 Irkutsk 664033 Russia;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    Russian Acad Sci Inst Earths Crust Siberian Branch Lermontova St 128 Irkutsk 664033 Russia;

    Russian Acad Sci Inst Earths Crust Siberian Branch Lermontova St 128 Irkutsk 664033 Russia;

    Russian Acad Sci Inst Earths Crust Siberian Branch Lermontova St 128 Irkutsk 664033 Russia;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Beijing 100085 Peoples R China;

    Russian Acad Sci Inst Earths Crust Siberian Branch Lermontova St 128 Irkutsk 664033 Russia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    Cosmogenic Be-10 dating; Bedrock fault scarp; Rupture zone; Earthquake; Baikal rift;

    机译：宇宙原性BE-10约会;基岩故障围巾;破裂区;地震;贝加尔裂缝;

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