| 江南隆起带褶皱基底变质变形温压条件研究 |
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| 引用本文：李民,章泽军.2006.江南隆起带褶皱基底变质变形温压条件研究[J].地球学报,27(6):543-550. |
| DOI：10.3975/cagsb.2006.06.04 |
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| 基金项目:中国石油化工公司重点项目“江南隆起沉积—构造演化及其对周缘地区油气成藏的控制作用”(编号:2003_18科技) |
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| 中文摘要:江南隆起带褶皱基底变质变形温压环境是地学界所关注的重要基础地质问题。作者通过对该区有代表性剖面中样品的伊利石结晶度指数、b0值、流体包裹体测温以及变质矿物相的分析,认为该区变质变形具非均匀性,但总体处于低温、低中压环境(估计温度为300~400℃,压力为3~5kbar,地热梯度为25℃/km)。结果还表明,褶皱基底中块体的垂向相对运动约为2km,造山过程表现为大范围的整体抬升,不同的构造单元有大致相近的变质变形环境。因此,江南隆起带褶皱基底这一宏观变形强烈、微观变形甚弱的现象属于低温下准塑性变形结果。 |
| 中文关键词:江南隆起带 伊利石结晶度 b0值 流体包裹体 |
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| The Metamorphic Deformational Temperature-Pressure Conditions of the Folded Basement in the Jiangnan Uplift |
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| Abstract:The metamorphic deformational temperature-pressure conditions of the folded basement in the Jiangnan uplift constitute a crucial basic geological problem which has aroused interest among geologists. Based on studies of illite crystallinity, b-0 values, fluid inclusions and metamorphic mineral facies in the representative plane section, the authors hold that the metamorphic deformational features of fold basement in the Jiangnan Uplift are heterogeneous. Studies also show that the activity might have taken place under the conditions of low temperature and low-middle pressure(estimated temperature 300～400 ℃, pressure 3～5 kbar and geothermal gradient 25 ℃/km). Furthermore, the vertical relative movement of the massif is about 2 km,the orogenic process behaves as integral large-scale uplifting in the folded basement, and the metamorphism and deformation in different tectonic units are approximately consistent. The phenomenon of high macroscopic deformation and low microcosmic deformation of the folded basement in the Jiangnan uplift is attributed to the quasi-plastic deformation at low temperatures. |
| keywords:Jiangnan uplift illite crystallinity b_0 value fluid inclusion |
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