关键词: 济阳坳陷, 晚古生代, 中生代, 构造演化, 地幔柱, 垂直缝合线构造, 物源区性质, 古构造应力场

Abstract: The Paleozoic tectonic stress field was reconstructed with the vertical stylolite structure found in the Ordovician and Carboniferous limestone. The identification of Paleozoic tectonic stress field showed that North China craton suffered the horizontal compression in the NNE-SSW direction and uplifted at the beginning of the Ordovician. Then it had suffered erosion for 140 Ma until the Late Paleozoic era. The analyses on the seismic section, the action rate of faults and the volcanic activity indicated that the squeezing action was the strongest in Late Triassic of Jiyang Depression, and the Early-Middle Jurassic was the tectonic transition period. In the Late Jurassic, Jiyang Depression was featured by the extension in the south-north direction, which resulted from the upwelling of mantle plume in the eastern region of North China. The provenance nature and tectonic setting from discrimination of the rock slice data in the Late Paleozoic and Mesozoic showed that the Permian-Carboniferous provenance was natured to the recycled orogen and dissected arc. The Mesozoic provenance was natured to the recycled orogen and magma arc. The ancient basement blocks in the Mesozoic suffered little erosion, which showed that Jiyang Depression was the terrestrial basin of active continental margin.

Key words: Jiyang Depression, Late Paleozoic, Mesozoic, tectonic evolution, mantle plume, vertical stylolite structure, provenance nature, palaeo-structure stress field