CHRONOLOGICAL STUDIES ON ACTIVE FAULTS AND GROUND FISSURES IN GUANZHONG AREA, SHAANXI PROVINCE,CHINA
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摘要: 取该区活动断裂中的断层泥,并首次在几个断层面附近的劈理化黄土中取样测出热释光年龄。12个断层热释光年龄数据在20-240ka B P之间变化,证实中更新世晚期和晚更新世期间断层曾有一次活动,为本区断层的活动性提供了证据。本研究成果也为西安地裂缝的活断层与人工抽水双重成因提供了证据。Abstract: 12 Thermoluminecence datings of the fault gouge and the adjoining cleaved loess of the area gives an age of 20-240 ka B P.It shows that the faults have been active during the late middle pleistocene to Late Pleistocene.Geomorphological and geological evidences are provided to show the alternation of rapid movement and show creep of the faults.The ground fissures in Xi'an City are in fact active faults,having been triggered to revive by pumping water from the confined aquifer.
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Key words:
- active fault /
- ground fissure /
- thermohuminecence dating /
- Guanzhong
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