Neogene seismites and seismic volcanic rocks in the Linqu area, Shandong Province, E China
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Date
2014-06-30
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Bogucki Wydawnictwo Naukowe
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Abstract
The Yishu Fault Zone runs through the centre of Shandong Province (E China); it is a deep-seated large fault system that
still is active. Two volcanic faulted basins (the Shanwang and Linqu Basins) in the Linqu area, west of the fault zone,
are exposed to rifting, which process is accompanied by a series of tectonic and volcanic earthquakes with a magnitude
of 5–8. Lacustrine sediments in the basins were affected by these earthquakes so that seismites with a variety of soft -sediment deformation structures originated. The seismites form part of the Shanwang Formation of the Linqu Group.
Semi-consolidated fluvial conglomerates became deformed in a brittle way; these seismites are present at the base of the
Yaoshan Formation. Intense earthquakes triggered by volcanic activity left their traces in the form of seismic volcanic
rocks associated with liquefied-sand veins in the basalt/sand intercalations at the base of the Yaoshan Formation. The -se palaeo-earthquake records are dated around 14–10 Ma; they are responses to the intense tectonic extension and the
basin rifting in this area and even the activity of the Yishu Fault Zone in the Himalayan tectonic cycle.
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Keywords
Seismite, Seismic volcanic rock, Neogene, Tectonic extension, Linqu
Citation
Geologos, 2014, 20, 2, s. 125-137
ISBN
978-83-232187-4-6