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STUDY ON THE SEDIMENTARY SEQUENCE AND SEDIMENTARY FACIES OF THE EARLY CRETACEOUS HEKOU GROUP IN LANZHOU—MINHE BASIN

Xian-qin Yan

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Abstract

The Early Cretaceous Hekou Group in Lanzhou-Minhe Basin is composed of terrestrial sediments with great thickness, and can be subdivided into eight informal formations.According to the lithologic combination and sedimentary cycles,the alluvial fan facies,delta facies and the shallow lacus facies as well as thirteen kinds of subfacies are identified in Hekou Group.The evolution of the sedimentary facies reflected whole development of the basin.In a word,the Lanzhou-Minhe Basin Cretaceous has experienced three phases :the alluvial fan facies;delta facies,the shallow lacus facies, and the delta-fluvial facies-delta facies, reflecting the different phases the basin experienced.

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What this paper is about

The Early Cretaceous Hekou Group in Lanzhou-Minhe Basin is composed of terrestrial sediments with great thickness, and can be subdivided into eight informal formations.According to the lithologic combination and sedimentary cycles,the alluvial fan facies,delta facies and the shallow lacus facies as well as thirteen kinds of subfacies are identified in Hekou Group.The evolution of the sedimentary facies reflected whole development of the basin.In a word,the Lanzhou-Minhe Basin Cretaceous has experienced three phases :the alluvial fan facies;delta facies,the shallow lacus facies, and the delta-fluvial facies-delta facies, reflecting the different phases the basin experienced.

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Available abstract

The Early Cretaceous Hekou Group in Lanzhou-Minhe Basin is composed of terrestrial sediments with great thickness, and can be subdivided into eight informal formations.According to the lithologic combination and sedimentary cycles,the alluvial fan facies,delta facies and the shallow lacus facies as well as thirteen kinds of subfacies are identified in Hekou Group.The evolution of the sedimentary facies reflected whole development of the basin.In a word,the Lanzhou-Minhe Basin Cretaceous has experienced three phases :the alluvial fan facies;delta facies,the shallow lacus facies, and the delta-fluvial facies-delta facies, reflecting the different phases the basin experienced.

Key concepts: Facies, Geology, Cretaceous, Structural basin, Lithology, Alluvial fan, Sedimentary rock, Delta

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STUDY ON THE SEDIMENTARY SEQUENCE AND SEDIMENTARY FACIES OF THE EARLY CRETACEOUS HEKOU GROUP IN LANZHOU—MINHE BASIN — Research Paper | ScholarLens