Genesis of the Permian Limestone Neptunian Dykes and Limestone Breccia Talus in the Xiajia Area,
详细信息
- 责任者：Peng Yang （School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Lu Gang
- 刊名：Geological Review
- 出版年：2009
- 卷期：55(1)
- 关键词：石灰岩 ; limestone ; 岩脉 ; dikes ; 角砾岩 ; breccia ; 广西 ; Guangxi
- 页码：p.43-48
- 图表：4 illus., 1 table, 9 refs.
- 分类号：0830
- issnNo：ISSN0371-5736
- isbnNo：CN11-1952/P
摘要
In 1978, Guangxi 8th Geological Team identified the limestone neptunian dykes of Maokouan stage, Middle Permian, roughly upright in the Middle Devonian Donggangling Formation and Upper Devonian Rongxian Formation. In the same place, limestone breccias of the Maokouan stage, Middle Permian, cemented Carboniferous--Early Permian bioclastics and formed breccia talus. The limestone neptunian dykes were interpretated as reopened axial cleavages in paleo-unconformity surface and immediately filled with transgressive sediments; or giant tensile fractures in carbonate platform in response to the seafloor spreading of the Youjiang basin and filled with syn-spreading sediments. The limestone breccia talus was explained as karst breccias caused by paleo-anticline uplift. This study identified earthquake-caused liquefied sediments flows in limestone neptunian dykes. The study also identified that the limestone dykes were tensile fracture caused by syn-sediment faulting. This consideration is accorded with that information from lava in Youjiang basin and the neighbor areas.
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