Traces of the Triassic collision between the North and South China Blocks in the form of seismites and other event layers

2020 
Abstract Drilling cores of the Yanchang Formation, a clastic deposit of Middle to Late Triassic age in the Ordos Basin on the North China Block, show strongly deformed layers that are interpreted as seismites. The seismites occur, together with volcanic tuffs, organic-rich shales and turbidites in the deltaic and lacustrine sediments, most commonly in the lowermost part of the Middle Triassic sediments, which consist predominantly of organic-rich shales. The seismites are interpreted to have been caused by earthquakes related to the collisional tectonics during a major phase of the complex collision between the South China Block and the North China Block. The volcanic ash layers and frequent turbidites must also have originated from this collision.
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