CAJ | 학술논문

根据前人和作者现有资料,对下扬子地区,特别是宁镇地区奥陶纪已经报道的牙形刺属种进行厘定,并按牙形刺带逐带进行多样性统计分析,初步编制出该地区奥陶纪牙形刺属种的地层延限表.研究表明;下扬子区牙形刺在奥陶纪的宏演化经历了3次较明显的辐射事件,分别发生在特马豆克期晚期-弗洛期早期(Serratognathus diversua带)、大坪期早期(Baltoniodus triangularis带)、达瑞威尔期晚期(Eoplacognathus suecicus带);此外,还经历了2次快速增长期,分别发生在达瑞威尔期早期(Lenodus antivariabilis带)、桑比期晚期至凯迪期早期(Hamarodus europaeus带),后者可能与局部环境变化有关.研究表明:华南海平面升降对下扬子区牙形刺宏演化趋势有重要影响.
근거전인화작자현유자료,대하양자지구,특별시저진지구오도기이경보도적아형자속충진행전정,병안아형자대축대진행다양성통계분석,초보편제출해지구오도기아형자속충적지층연한표.연구표명;하양자구아형자재오도기적굉연화경력료3차교명현적복사사건,분별발생재특마두극기만기-불락기조기(Serratognathus diversua대)、대평기조기(Baltoniodus triangularis대)、체서위이기만기(Eoplacognathus suecicus대);차외,환경력료2차쾌속증장기,분별발생재체서위이기조기(Lenodus antivariabilis대)、상비기만기지개적기조기(Hamarodus europaeus대),후자가능여국부배경변화유관.연구표명:화남해평면승강대하양자구아형자굉연화추세유중요영향.
After restudy on the Ordovician eonodont taxonomy and ranges of the conodont species published before and our new materials, the conodont stratigraphical ranges in each zone of the Lower Yangtze Valley (especially that of the Nanjing Hills area) are summarized. Five bio-events can be recognized during the Ordovician. The conodont radiation in the studied area reached its acme at the Tremadoeian-Floian boundary (Serratognathus diversus Zone), early Dapingian (Baltoniodus triangularis Zone), and Middle-Late Darriwilian (Eoplacognathus suecicus Zone). Besides, the eonodont species has experienced a rapid increase during the early Darriwilian (Lenodus antivariabilis Zone) and early Katian (Hamarodus europaeus Zone). The research suggests that the conodont radiation may be related to the local sea-level change.