The Mesoproterozoic ‘seismite’ at Laiyuan (Hebei Province, E China) re-interpreted
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Date
2014-06-30
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Bogucki Wydawnictwo Naukowe
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Abstract
A 1-million m3 breccia near Laiyuan (Hebei Province, E China) occurs as a block-like lithological unit between dolo -stones of the 1.55–1.45 Ga (Early Mesoproterozoic) Wumishan Formation. It has previously been interpreted as a seis -mite, but it appears not to fulfil any of the commonly accepted criteria that jointly are considered diagnostic for seis -mites. Its presence in a graben-like structure with almost vertical bounding fault planes rather indicates an origin as
a (submarine) valley fill. As the valley originated by tectonic activity in the form of faulting, the breccia can be consid-ered as a secondary effect of seismic activity, but it does not represent a seismite.
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Keywords
Seismite, Valley fill, Graben sedimentation, Wumishan Formation, Mesoproterozoic, Fangshan geopark, Hebei Province, China
Citation
Geologos, 2014, 20, 2, s. 139-146
ISBN
978-83-232187-4-6