Late Paleozoic to Early Mesozoic mafic–ultramafic complexes from the northern North China Block: Constraints on the composition and evolution of the lithospheric mantle
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Devonian
Ultramafic rock
The term formation is the basic lithostratic unit which is divided based on the lithological characters. The Carboniferous Permian strata developed well in the Deriangma Xiala section and the Angjie section in Shenzha, Tibet. All the lithostratic units of the Carboniferous and Permian strata in this area were named after them. However, some of them were not defined based on the lithological characters but on the fossil assemblages in the sections, and do not accord with the principle of the multiple stratigraphical classification. And the lithostratic system of the Carboniferous Permian has been a controversial subject for a long time. The lithostratic systems of the Carboniferous Permian in the area are manily remarked by the author in the present paper, and the Carboniferous Permian boundary is discussed briefly.
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In order to understand the distribution of Carboniferous-Permian in Ejina Banner and its vicinities,and provide evidence for oil and gas resources investigation and evaluation,through fine processing and interpretation of previous data and newly finished integrated geophysical survey sections,by using joint inversion of gravity,magnetic and electronic data under restriction of seismic and well data,this paper preliminarily presented the distribution and burial situation of Carboniferous-Permian residues in the region.Thus it is concluded that the Carboniferous-Permian strata show the characteristics of thicker residual and suitable depth.The method has solved the technical problem of Carboniferous-Permian distribution interpretation and provides evidence for Carboniferous-Permian research within the internal part of the basin.
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Abstract The Daposhang section at Muhua, Changshun, Guizhou, is an excellent and attractive Devonian‐Carboniferous boundary section. The transitional beds between the Devonian and Carboniferous of the section are continuous and well exposed, belonging to the deep‐water basin facies. Abundant fossil groups have been discovered from this section: conodonts, ammonoids, trilobites, ostracods, vertebrate microfossils and so on. So far as known, it has the most continuous and complete conodont zonation for the Devonian‐Carboniferous boundary beds in the world. It is especially worth pointing out that both typical Siphonodella praesulcata and the transitional forms between S. praesulcata and S. sulcata have been found from the upper praesulcata Zone of the Daposhang section. Evidently, we can not only prove the actual existence of the evolutionary lineage from S. praesulcata to S. sulcata , but also exactly define the level of the Devonian‐Carboniferous boundary. In this paper, the development of the Devonian‐Carboniferous boundary beds at the Daposhang section is dealt with and the section is compared with the Muhua section and the Nanbiancun section which are the candidates for the Devonian‐Carboniferous boundary stratotype. In the authous' opinion the Daposhang section is obviously better than the Muhua and the Nanbiancun sections, hence it can be recommended as one of the candidates for the international Devonian‐Carboniferous boundary stratotype.
Devonian
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Conodont
Late Devonian extinction
Tournaisian
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Devonian
Late Devonian extinction
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