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- W2348658313 abstract "The layer at the bottom of the middle Triassic Manghuai Formation in the western Yunnan, has long been considered as normal sandy gravel of basal conglomerate characteristics. However, recent field investigation and comparative study in Yakou region have discovered that this layer is in fact composed of a series of pyroclastic rocks. This layer can be assigned to a series of collision type K-rich dacite—kaliliparite and lava, which contain angular granitic agglomerates and rubbles of different sizes. The characteristics of these agglomerates and rubbles indicate their formation process of rapid break down, in-situ accumulation and supergene consolidation. The bottom of the layer is contacted directly with the Yakou monzonitic granite, the compositions of which are comparable to those of the granitic agglomerates and rubbles. Crytoexplosion breccia and pyroclastic veins that have the same compositions as those of agglomerates and rubbles are developed in monzonitic granite rock mass. The contact plane between the layer and the granite is very distinct and appears as subdued relief. It is suggested, therefore, that the contact between the bottom of the Manghuai Formation with the Yakou granite should be assigned to an unconformity caused by volcanic eruption, while the granite rock mass itself has become a volcanic conduit due to the explosion. At the same time, regional stratigraphic correlation has also revealed that the contact between the volcanic rocks of Manghuai Formation and the underlying strata (middle Triassic Shanglan Formation) should also be a discordance caused by volcanic eruption. This conclusion may provide a new insight into the basic geology of the western Yunnan region." @default.
- W2348658313 created "2016-06-24" @default.
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- W2348658313 date "2003-01-01" @default.
- W2348658313 modified "2023-09-25" @default.
- W2348658313 title "GEOLOGICAL CHARACTERISTICS AND SIGNIFICANCE OF VOLCANIC ROCKS AT THE BOTTOM OF THE MIDDLE TRIASSIC MANGHUAI FORMATION IN YAKOU REGION, SIMAO CITY, YUNNAN PROVINCE" @default.
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