Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area

WU Xing-ning; ZHAO Zong-ju

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Article Navigation > Acta Sedimentologica Sinica > 2005 > 23(2): 310-315

WU Xing-ning, ZHAO Zong-ju. Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area[J]. Acta Sedimentologica Sinica, 2005, 23(2): 310-315.

Citation:

WU Xing-ning, ZHAO Zong-ju. Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area[J]. Acta Sedimentologica Sinica, 2005, 23(2): 310-315.

Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area

Hangzhou Institute of Geology, PetroChina, Hangzhou 310023

Received Date: 2004-03-25
Rev Recd Date: 2004-07-08
Publish Date: 2005-06-10

Abstract

There are many types of meter-scale cyclic-sequence developed in Ordovician of Tazhong area. They contain abundant information on structure, sea-level change and the accumulated action of sediment. On the basis of the previouswork, and combining region geological data and detailed observation as well as descrip tion of the rock column, the meter-scale cyclic-sequence in Ordovician of Tazhong area are subdivided into four types: ocean-semiocean L-M type、lower slope-deep water asymmetrical type, subtidal type and peritidal type. On the characters of facies serial and structure, the meter-scale cyclic-sequences have the character of reverse grain serial developed on the instantaneous submerge discontinuous surface, or have the character of reverse or correctitude grain serial developed on the instantaneous emerge discontinuous surface. They all behave serial and vertical congruence format in long cycle third-order sequence. The sedimentary velocity and forming cycle of the meter-scale cyclic-sequence developed in Ordovician of Tazhong area and the periodic changes ofMilankovitch cycles have evidence relativity. it is concluded that the development of the Ordovician meter-scale cyclic-sequence in Tazhong area is controlled by the high-frequency changes of sea-level, and the high-frequency changes of sea-level is controlled by the change of global climate and the melt and flow of the continental glacier, which controlled by the periodic changes of Milankovitch cycles
- meter-scale cycle,
- high frequency sequence,
- Ordovician,
- carbonate rock,
- Tazhong area

References

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Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area

Hangzhou Institute of Geology, PetroChina, Hangzhou 310023

Received Date: 2004-03-25

Rev Recd Date: 2004-07-08

Publish Date: 2005-06-10

Key words:

Abstract: There are many types of meter-scale cyclic-sequence developed in Ordovician of Tazhong area. They contain abundant information on structure, sea-level change and the accumulated action of sediment. On the basis of the previouswork, and combining region geological data and detailed observation as well as descrip tion of the rock column, the meter-scale cyclic-sequence in Ordovician of Tazhong area are subdivided into four types: ocean-semiocean L-M type、lower slope-deep water asymmetrical type, subtidal type and peritidal type. On the characters of facies serial and structure, the meter-scale cyclic-sequences have the character of reverse grain serial developed on the instantaneous submerge discontinuous surface, or have the character of reverse or correctitude grain serial developed on the instantaneous emerge discontinuous surface. They all behave serial and vertical congruence format in long cycle third-order sequence. The sedimentary velocity and forming cycle of the meter-scale cyclic-sequence developed in Ordovician of Tazhong area and the periodic changes ofMilankovitch cycles have evidence relativity. it is concluded that the development of the Ordovician meter-scale cyclic-sequence in Tazhong area is controlled by the high-frequency changes of sea-level, and the high-frequency changes of sea-level is controlled by the change of global climate and the melt and flow of the continental glacier, which controlled by the periodic changes of Milankovitch cycles

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Aanlyses of Ordovic ianMeter-Scale Cyclic-Sequence in Tazhong Area

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