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Ordovician chitinozoan diversification events in China 被引量:5

Ordovician chitinozoan diversification events in China
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摘要 Correlative study of the Ordovician chitinozoan biostratigraphy in China with grap- tolite and conodont biozones, and comprehensive analysis of the sequence- and event-strati- graphic indicated that 17 chitinozoan zones and 5 main chitinozoan diversification events subsequently occurring could be recognized in the Ordovician System of China. The 5 events comprise: event 1 — appearance of the earliest Ordovician chitinozoans, event 2 —appearance of C. symmetrica, event 3 —juvenile radiation of chitinozoans, event 4 —appearance of chitinozoans with high diversity, and event 5 —development of chitinozoans of deep-water facies. The age and feature of each event and its relation with the sea-level change and other geological event are discussed. Correlative study of the Ordovician chitinozoan biostratigraphy in China with graptolite and conodont biozones, and comprehensive analysis of the sequence- and event-strati-graphic indicated that 17 chitinozoan zones and 5 main chitinozoan diversification events subsequently occurring could be recognized in the Ordovician System of China. The 5 events comprise: event 1—appearance of the earliest Ordovician chitinozoans, event 2—appearance of C. symmetrica, event 3—juvenile radiation of chitinozoans, event 4—appearance of chitinozoans with high diversity, and event 5—development of chitinozoans of deep-water facies. The age and feature of each event and its relation with the sea-level change and other geological event are discussed.
出处 《Science China Earth Sciences》 SCIE EI CAS 2004年第10期874-879,共6页 中国科学(地球科学英文版)
基金 supported by the China Geological Survey(Project No.200113900072) the National Natural Science Foundation of China(Grant No.40272020).
关键词 chitinozoan Ordovician DIVERSIFICATION event. chitinozoan Ordovician diversification event
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