Mesozoic Continental Volcanic Structure in Qagan Obo Area, Dongwu Qi, Inner Mongolia
详细信息
- 责任者：Cheng Yinhang (Tianjin Institute of Geology and Mineral resources ; Tianjin 300170 ; China) ; Teng Xuejian
- 刊名：Geological Survey and Research
- 出版年：2011
- 卷期：34(1)
- 关键词：火山机体 ; volcanic edifice ; 陆地环境 ; terrestrial environment ; 内蒙古 ; Inner Mongolia
- 页码：p.16-22
- 图表：6 illus., 1 table, 9 refs.
- 分类号：0801
- issnNo：ISSN1672-4135
- isbnNo：CN12-1353/P
摘要
Mesozoic continental volcanic rocks are widely distributed in Qagan Obo area, which are the important component of Daxing’anling volcanism. The isotopic data and the volcanic rock facies indicate that the volcano eruption experienced about 30 ~ 40 Ma with two cycles of volcanic activities which are Manketouebo and Baiyingaolao. The authors recognize 9 ancient volcanic structures and 11 craters. Both two cycles of volcano eruption all began with partial intermediate pyroclastic rocks and lava rocks, and end with acid volcanic rocks. The volcanic activities are controlled by the regional fault belt obviously, and the eruption centers distribute along the NE-NNE basement structure. The most craters appear in two superimposed volcano groups, named Caldera groups and Stratordcano groups.
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