碳酸盐岩米级旋回层序的成因类型及形成机制
GENETIC TYPES AND MECHANISMS OF THE CARBONATE ROCK METER-SCALE CYCLIC SEQUENCES
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摘要: 在前人研究及自己野外观察的基础上,本文把碳酸盐岩米级旋回层序归为四大类:深水非对称米级旋回层序、L-M米级旋回层序、潮下碳酸盐米级旋回层序、潮坪碳酸盐米级旋回层序。米级旋回层序的形成机制是与米兰柯维奇旋回有关的高频率海平面振荡变化旋回所形成的间断-加积旋回沉积作用,它们的识别标志主要是岩石类型、界面特征、产出环境等。碳酸盐岩米级旋回层序的规则的垂直叠加形式是识别三级旋回层序的基础。Abstract: Four genetic types are sugggested for the carbonate rock meter-scale cyclic sequences on the basis of the previous study and field investigation made by the author. They are deep-water asymmetrical carbonate rock meter-scale cyclic sequences,limestone-marl meter-scale cyclic sequences,subtidal carbonate rock meter-scale sequences and tidal-flat carbonate rock meter-scale sequences. Their genetic mechanism is punctuated-aggradational allocyclic mechanism which is related to high-frequency cyclic sea-level changes resulted from the Milankovitch cycle. The criteria for recognition of these sequences include the types of the carbonate rocks, boundary nature and environments of the meter-scale cyclic sequences. The regularly vertical stacking patterns of the meter-scale cyclic sequences are interpreted as the basis for distinguishing third-order cyclic sequences.
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Keywords:
- carbonate rock /
- meter-scale cyclic sequence /
- genetic type /
- genetic mechanism
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