Sedimentary Facies and Evolution of Late Cretaceous in the Yanfu Depression from Jiangsu Province

LIN Chun ming; SONG Ning; MU Rong; ZHAO Yan yan; WANG Ya jun; YANG De zhou

The types of sedimentary facies and sedimentary characteristics in Pukou Formation of Late Cretaceous System in Yanfu Depression are systematically analyzed, and the planar distribution of sedimentary facies in the members of Pukou Formation and the laws of facies evolution are studied in detail.The conclusions show that Pukou Formation is mainly comprised by alluvial fans, fan deltas and lacustrine facies.In the basin, from the margin to the center, the facies developed from alluvial fans, gradually to fan deltas or lakefront facies, shallow-take facies, semi-deep lake facies, or saline lake facies;from the bottom to the top, the facies gradually changed from alluvial fans to fan-deltas or lakefront facies, to shallow-lake facies, semi-deep-lake facies or saline facies, finally to shallow-lake facies.The Pukou Formation can be divided into four stages:initial stage, fore-stage, metaphase and terminal-stage.The sedimentary characteristics are correspondingly different in various stages and areas.But, as a whole, the Yanfu Depression changed from narrow to wide, and then to narrow.

1. Department of Earth Sciences, State Key Laboratory ofOre Genesi, Nanjing University, Nanjing 210093;

2. Geophysical Research Institute, Jiangsu Oil-field, Nanjing 210016

Received Date: 2002-10-09

Rev Recd Date: 2002-11-25

Publish Date: 2003-12-10

Key words:

Abstract: The types of sedimentary facies and sedimentary characteristics in Pukou Formation of Late Cretaceous System in Yanfu Depression are systematically analyzed, and the planar distribution of sedimentary facies in the members of Pukou Formation and the laws of facies evolution are studied in detail.The conclusions show that Pukou Formation is mainly comprised by alluvial fans, fan deltas and lacustrine facies.In the basin, from the margin to the center, the facies developed from alluvial fans, gradually to fan deltas or lakefront facies, shallow-take facies, semi-deep lake facies, or saline lake facies;from the bottom to the top, the facies gradually changed from alluvial fans to fan-deltas or lakefront facies, to shallow-lake facies, semi-deep-lake facies or saline facies, finally to shallow-lake facies.The Pukou Formation can be divided into four stages:initial stage, fore-stage, metaphase and terminal-stage.The sedimentary characteristics are correspondingly different in various stages and areas.But, as a whole, the Yanfu Depression changed from narrow to wide, and then to narrow.

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Sedimentary Facies and Evolution of Late Cretaceous in the Yanfu Depression from Jiangsu Province

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