Earthquake event deposits in Mesoproterozoic Kunyang Group in central Yunnan Province and its geological implications |
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Authors: | Du Yuansheng ZHANG Chuanheng HAN Xin GU Songzhu Lin Wenjiao |
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Institution: | 1. Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2. Faculty of Earth Science and Resource, China University of Geosciences, Beijing 100083, China |
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Abstract: | Earthquake and its resultant tsunami, as a kind of disaster events in geological history, may be recorded as event deposits
of seismite and tsunamite. Typical characteristics of seismite and tsunamite, including seismo-fracture bed, synsedimentary
microfracture, micro-corrugated lamination, molar tooth structure, hummocky bedding, occurs in Mesoproterozoic Dalongkou Formation
of Kunyang Group in central Yunnan Province. Three types of sedimentary units have been recognized: seismite (unit-A, including
limestone with molar tooth structure, seismic shattering rock, seismic corrugated rock, autoclastic breccia and intraclastic
parabreccia), tsunamite (unit-B, intraclastic limestone with hummocky or parallel beddings) and background deposits (unit-C).
Various stackings of these units construct three distinct sedimentary sequences: A-B-C, A-C and B-C. A-B-C represents an event
sedimentary sequence of earthquake-tsunami-background deposits, A-C represents the sequence of earthquake and background deposits
(no tsunami occurring), and B-C represents the sequence of tsunami and background deposits (far from the center of earthquake).
As the central Yunnan Province was located in a tectonic setting of rift basin in Mesoproterozoic Era, the earthquake event
deposits of the Dalongkou Formation are sedimentary response to tectonic activity of the rift basin. |
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Keywords: | Yunnan Province Mesoproterozoic Era earthquake tsunami seismites tsunamites |
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