科研之友
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摘要
A shelly chenier ridge, about 400 m long, 30 m wide, and > 6 m high, rests upon a tidal flat near the Kongjiao River mouth on the coast of South China. A trench along the cheater axis, an outcrop at the west outlet transecting the cheater, and three bore-holes drilled down through underlying tidal flat clay and silt sediments to weathered granite, provided opportunity to describe the sedimentary structures and stratigraphy of the cheater. The stratigraphy and sedimentary structures suggest that the chenier evolved at the end of the Holocene sea level transgression. It is comprised predominantly of shells, the upper layers of which have become cemented under subaerial conditions. Identified sedimentary structures such as hummocky bedding and sharp-based fining-up structures, suggest a storm wave origin. These sharp-based fining-up structures are several meters above the present spring tide level, and storm surges are a likely explanation for their formation. However tectonic uplift has possibly contributed to raising the chenier to its present elevation above MSL.
