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Long-term crustal movement caused by the Chiuchiungkeng Fault in southwestern Taiwan: Constraints from luminescence dating

机译:台湾西南部潮前坑断层引起的长期地壳运动:发光测年的制约

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摘要

To investigate the long-term crustal movement of the Chiuchiungkeng Fault (CCKF), a proposed active fault located in the southwestern coastal plain of Taiwan, two boreholes and dissected alluvial fans were selected for determination of depositional ages using luminescence. The standard single-aliquot regenerative-dose (SAR) protocol was applied to large aliquots of 90-150 μm quartz, with dose rates based mainly on high-resolution gamma spectrometry. The laboratory growth curves show a relatively large saturation value, which should allow reliable ages to be determined back to ~ 150 ka. To test whether a significant sensitivity change occurred during natural measurement, the single-aliquot regeneration and added dose (SARA) method was also used to estimate equivalent dose; this showed that a sensitivity change of ~4% may be introduced during the routine SAR procedure. The age results, unaffected by significant sensitivity change, all lie within 60 -105 ka, and an 80 ka synchronous surface is used to evaluate the long-term fault behaviour. Based on the offset across the hanging wall and footwall, a long-term fault slip rate of ~1.5m ka~(-1) is estimated for the near-surface CCKF. From the anomalously steep slope of an 80 ka abandoned fan surface observed in the hanging wall, a long-term tilt rate of ~42 m km~(-1) can be also derived based on the assumption that the initial slope is given by the modern river bed. Finally, it is deduced that the slip rate of the CCKF along its deeper part must be greater than ~1.5 m ka~(-1) since the apparent rate is reduced by folding of the hanging wall.
机译:为了研究位于台湾西南沿海平原的拟建活动断层潮吹坑断层(CCKF)的长期地壳运动,选择了两个钻孔和解剖冲积扇,利用发光法确定了沉积年龄。将标准的单等分再生剂量(SAR)协议应用于90-150μm石英的大等分试样,剂量率主要基于高分辨率伽马能谱法。实验室的生长曲线显示出一个相对较大的饱和度值,应该可以确定可靠的年龄回到150 ka。为了测试在自然测量过程中是否发生了显着的灵敏度变化,还使用了单等分再生和添加剂量(SARA)方法来估算等效剂量;这表明在常规SAR程序中可能会导致〜4%的灵敏度变化。年龄结果不受显着灵敏度变化的影响,都在60 -105 ka之内,并且使用80 ka同步表面来评估长期断层行为。根据悬壁和底壁的偏移量,估计近地表CCKF的长期断层滑动率约为1.5m ka〜(-1)。从悬挂壁上观察到的80 ka废弃风扇表面的异常陡峭斜率,还可以基于假定初始斜率由下式给出的长期推定,得出〜42 m km〜(-1)的长期倾斜率。现代河床。最后,推论CCKF沿其深部的滑动速率必须大于〜1.5 m ka〜(-1),因为表观速率会因悬挂壁的折叠而降低。

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  • 来源
    《Quaternary International》 |2009年第2009期|15-24|共10页
  • 作者单位

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China The Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, University of Aarhus, Riso DTU, DK-4000 Roskilde, Denmark;

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China;

    The Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, University of Aarhus, Riso DTU, DK-4000 Roskilde, Denmark;

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China;

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China;

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China;

    Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of China;

    Central Geological Survey, MOEA, No. 2, Lane 109, Hua-Hsin Street, Chung-Ho, Taipei 235, Taiwan, Republic of China;

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