Fusulinoidean faunal succession of a Paleo–Tethyan oceanic seamount in the Changning–Menglian Belt, West Yunnan, Southwest China: An overview
Fusulinoidean faunal succession of a Paleo–Tethyan oceanic seamount in the Changning–Menglian Belt, West Yunnan, Southwest China: An overview
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DOI：
10.1046/j.1440-1738.2003.00387.x
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发表时间：
2003-06
期刊：
影响因子：
1.5
通讯作者：
K. Ueno;Yujing Wang;Xiangdong Wang
中科院分区：
文献类型：
--
作者：
K. Ueno;Yujing Wang;Xiangdong Wang
摘要首次研究了滇西长宁—孟连带中部禹唐寨剖面古特提斯海山型碳酸盐岩的fusulinoidea动物演替。长宁-孟连造山带是代表东亚封闭的古特提斯主造山带之一。禹唐寨剖面以玄武岩和上覆碳酸盐为代表，厚度约1100 m。从Serpukhovian（晚密二叠世/早石炭世晚期）到Midian/Capitanian（中二叠世晚期/晚瓜达鲁普世）共17个fusulinoidea组合组成了连续的动物演替。在这一节中没有发现明显的动物区系断裂。于塘寨组合的属群和个别组成表明其动物群演替与特提斯和泛thalassan地区相似，属热带特提斯类型，但属群多样性明显低于华南、印度支那和中亚等古特提斯陆架。整个于唐寨剖面的碳酸盐岩基本上是块状的，成分非常纯净，缺乏陆源硅屑的输入。这些岩性特征与日本二叠纪和侏罗纪增生杂岩中海山成因的浅海沉积碳酸盐岩层序（如秋吉灰岩）相同。从岩相角度进一步论证了长宁—孟连带中部玄武岩—灰岩演替的海山成因。密西西比世中期（早石炭世中期），可能与热点活动有关的海洋海底火山作用形成了一批海山和海洋高原。它不仅在泛海时期活跃，在古特提斯时期也很活跃。
Abstract Fusulinoidean faunal succession from Paleo–Tethyan seamount‐type carbonates of the Yutangzhai section in the Central zone of the Changning–Menglian Belt of West Yunnan, Southwest China, is presented for the first time. The Changning–Menglian Belt is one of the orogenic belts that represent the closed main Paleo–Tethys in East Asia. The Yutangzhai section is represented by basalts and overlying carbonates, about 1100 m thick. It exhibits a continuous faunal succession composed of 17 fusulinoidean assemblages ranging from the Serpukhovian (late Mississippian/late Early Carboniferous) to Midian/Capitanian (late Middle Permian/late Guadalupian). No significant faunal break can be recognized in this section. The generic and some specific composition of the Yutangzhai assemblages indicates that the faunal succession is similar to those observed in Tethyan and Panthalassan areas and is of tropical Tethyan type although their generic diversity is definitely lower than those of Paleo–Tethyan shelves, such as South China, Indochina, and Central Asia. Throughout the Yutangzhai section, the carbonate rocks are essentially massive, very pure in composition, and devoid of terrigenous siliciclastic inputs. These lithologic characters are identical to those observed in accreted shallow‐marine carbonate successions of seamount origin in Permian and Jurassic accretionary complexes of Japan, for example the Akiyoshi Limestone. This evidence further demonstrates the seamount origin of the basalt–limestone succession in the Central zone of the Changning–Menglian Belt from the viewpoint of lithofacies. In middle Mississippian (middle Early Carboniferous) time, oceanic submarine volcanism that was probably related to hot spot activities formed a number of seamounts and oceanic plateaus. It was active not only in the Panthalassa, but also in the Paleo–Tethys.