摘要
本文介绍了“台湾—黑水地学大断面综合研究”(袁学诚,1990)中与湖南深部构造有关的研究成果:提出了华南地壳三层结构模型的确凿证据,明确了华南是较稳定的大陆地壳,整个华南不存在洋壳。并按上地幔电性差异推断华南岩石圈中存在软、硬不同的块体,据此划分了华南深部构造单元。指出湘中岩石圈增厚到300km,而且湘中地热流比正常值偏低1—2倍。由陆壳反射地震查明了江南古陆之下存在更老的结晶基底,对雪峰地区是否存在巨大推覆构造运动问题,给出了否定的答案。此外该成果还为研究湖南区域构造,提供了丰富的基础资料。也为探讨控制超大型矿床的深部构造背景,开创了新局面。这些研究成果必然会对我省基础地质研究工作产生深远影响。
This paper presents the research results of 'The Comprehensive Study of Taiwan-Heishui Geoscience Transect' concerning the infrastructures of Hunan province. Conclusive evidences for the three-layer structure model of the crust in South China are adduced and it is ascertained that South China is a relatively stable continental crust, and there is no oceanic crust in South China. According to the differences of electric properties in the upper Mantle, it is inferred that there are soft and hard blocks in the lithosphere of South China crust, based on which the infrastructural units of South China are divided. It is pointed out that the thickness of the lithosphere in central Hunan was increased to 300 km, and the geothermal current value of central Hunan is 1--2 times lower than the normal value. The continental crust reflection seismic survey indicates that there is older crystalline basement below Jiangnan old landmass,and a negative answer is given to the question whether there is mega-overthrust structure in Xuefeng region. In addition,the research result provided abundant basic information for the study of the regional structure in Hunan, and is of help to create a haw situation for the investigation of the infrastructural background controlling the superlarge scale deposits. These results will inevitably exert profound influence over the fundmental geologic studies in our province.
出处
《湖南地质》
1991年第2期89-96,共8页
Hunan Geology
关键词
深部构造
湖南
地质构造
地幔肾
Geoscience transect
Mantle kidney
Crust model
