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摘要: 在研究华南地区奥陶纪头足类生态特征基础上,根据头足类的生态类型及其保存条件等特征,识别出18个头足类生物相,即开阔台地[WT5”BX]Proterocameroceras生物相,局限台地Pseudoectenolites-Xiadongoceras生物相,开阔台地Retroclitendoceras-Pararetrocli tendoceras生物相,开阔台地Pronajaceras-Mamagouceras生物相,陆棚斜坡—盆地Cyclostomiceras-Bactroceras生物相,开阔台地 Cameroceras-Cyrtovaginoceras生物相,开阔台地 Coreanoceras-Manchuroceras生物相,陆棚斜坡—盆地Kaipingoceras-Kyminoceras生物相,内陆棚Bathmoceras-Protocycloceras生物相,中部陆棚Dideroceras-Ancistroceras生物相,深水陆棚 Lituites-Cyclolituites 生物相,滞流盆地Lituites-Trilacinoceras生物相,深水盆地Paraendoceras-Sactorthoceras,深水陆棚Sinoceras-Michelinoceras-Disoceras生物相,深水陆棚Beloitoceras-Jiangshanoceras生物相,深水陆棚—盆地Eurasiaticoceras生物相,浅海陆棚—斜坡Jiangxiceras-Yushanoceras生物相,深水盆地Michelinoceras[WT5”BZ]生物相,并阐述各生物相的组成、生态特征及其生态环境。根据头足类生物相在时间和空间上的组合规律,划分出3个头足类生物相区,即扬子生物相区、黔东—湘西生物相区(过渡型生物相区)和湘中—浙西生物相区,并讨论了各生物相区在不同时期内头足类生态类型和生物相分异特征、海平面升降、环境演变特征以及其与油气的关系。认为在低海平面或海平面下降阶段中生物相分异明显,而在高海平面阶段中则分异较小。Abstract: Based on studies of ecological characteristics of Ordovician Cephalopod from the southern China, Eighteen Cephalopod biofacies are recognized and described: 1.Open platform [WTBX]Proterocameroceras[WT] biofacies, 2. Restricted platform [WTBX]PseudoectenolitesXiadongoceras[WT] biofacies, 3. Open platform [WTBX]RetroclitendocerasPararetroclitendoceras[WT] biofacies, 4. Open platform [WTBX]Pronajaceras Mamagouceras[WT] biofacies, 5. Shelf slopebasin [WTBX]Cyclostomiceras[WT] biofacies, 6. Open platform [WTBX]CamerocerasCyrtovaginoceras
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Key words:
- cephalopoda biofacies /
- cephalopoda biofacies province /
- sea level changes /
- Ordovician /
- South China /
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