Seismic Records in Paleogene Alluvial Layers in Anqiu, Shandong

TIAN Hong-shui; WANG Jin-guang; LU Ming-ying; WANG Li-fa

Some se ismo-depositional layers are discovered in the alluvial facies of the Paleogene Zhubidian Formation in Yishu fault zone area of Anqiu City, Shandong. They are a set of seismites with seismo-depositional characterist ics such as vibration liquefied sand dykes, liquef ied sand veins, sandy cong lom erate dykes caused by fissure filling, seism ic fallm-asses, seismic small-scale fractures and collapse structures and so on. These Pa leogene seismites indicate that tectonic activity was in tense and strong earthquakesw ere frequently in Yishu Fault Zone during theEarly Cenozoic E ra. Seismic events recorded by these seism ites are the responses to theH imalayan Tectonic Cycle after the Yanshan tectonic cycle. The discovery of seismites in the Paleogene Zhubidian Formation ofAnqiu g ives some new materials for studying the active history of Yishu Fault Zone and regional stratigraphy.

1. Shandong Institute of Architecture and Engineering, Jinan 250014;

2. Shandong Geological Survey Institute, Jinan 250013

Received Date: 2004-10-14

Rev Recd Date: 2004-12-24

Publish Date: 2005-09-10

Key words:

Abstract: Some se ismo-depositional layers are discovered in the alluvial facies of the Paleogene Zhubidian Formation in Yishu fault zone area of Anqiu City, Shandong. They are a set of seismites with seismo-depositional characterist ics such as vibration liquefied sand dykes, liquef ied sand veins, sandy cong lom erate dykes caused by fissure filling, seism ic fallm-asses, seismic small-scale fractures and collapse structures and so on. These Pa leogene seismites indicate that tectonic activity was in tense and strong earthquakesw ere frequently in Yishu Fault Zone during theEarly Cenozoic E ra. Seismic events recorded by these seism ites are the responses to theH imalayan Tectonic Cycle after the Yanshan tectonic cycle. The discovery of seismites in the Paleogene Zhubidian Formation ofAnqiu g ives some new materials for studying the active history of Yishu Fault Zone and regional stratigraphy.

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Seismic Records in Paleogene Alluvial Layers in Anqiu, Shandong

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