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长江经济带地区岩石圈热流变结构和深部动力学

孙玉军 吴中海 贾凤琴

孙玉军, 吴中海, 贾凤琴, 2016. 长江经济带地区岩石圈热流变结构和深部动力学. 地质力学学报, 22 (3): 421-429.
引用本文: 孙玉军, 吴中海, 贾凤琴, 2016. 长江经济带地区岩石圈热流变结构和深部动力学. 地质力学学报, 22 (3): 421-429.
SUN Yu-jun, WU Zhong-hai, JIA Feng-qin, 2016. LITHOSPHERIC THERMAL-RHEOLOGICAL STRUCTURE AND DEEP GEODYNAMICS IN THE YANGTZE RIVER ECONOMIC BELT. Journal of Geomechanics, 22 (3): 421-429.
Citation: SUN Yu-jun, WU Zhong-hai, JIA Feng-qin, 2016. LITHOSPHERIC THERMAL-RHEOLOGICAL STRUCTURE AND DEEP GEODYNAMICS IN THE YANGTZE RIVER ECONOMIC BELT. Journal of Geomechanics, 22 (3): 421-429.

长江经济带地区岩石圈热流变结构和深部动力学

基金项目: 

中国地质调查局地质调查项目“长江经济带活动构造与区域地壳稳定性调查” DD20160268

详细信息
    作者简介:

    孙玉军(1983-), 男, 博士, 副研究员, 主要从事地球动力学方面的研究。E-mail:sunyujunabc@163.com

  • 中图分类号: P542+.5

LITHOSPHERIC THERMAL-RHEOLOGICAL STRUCTURE AND DEEP GEODYNAMICS IN THE YANGTZE RIVER ECONOMIC BELT

  • 摘要: 通过Crust 2.0模型构建有限元三维数值模型,以地表观测温度、深部反演温度和地表热流作为约束,计算了长江经济带地区岩石圈温度结构;在温度结构的基础上,通过GPS观测数据得到的地表应变率和选取代表性岩石物性,计算了长江经济带岩石圈流变强度和等效粘滞性系数。结果表明:长江经济带地区岩石圈表现出明显的横向不均匀性,其中四川盆地表现为低温、高强度和高粘滞性的特征,相同深度,四川盆地核心区比周围地块的温度低100~300℃,强度和粘滞性分别比周缘高1~2个数量级;在温度、强度和粘滞性的过渡地带构造活动性比较强烈。结合深部地球物理观测综合分析认为,长江经济带东、西部分别受到太平洋板块深俯冲和印度-欧亚大陆板块碰撞的影响,其深部影响范围分别达到四川盆地的东、西边界,深部动力学过程可能导致了岩石圈的横向不均匀性。

     

  • 图  1  长江经济带地区构造背景图(据文献[4~6]修编)

    箭头代表相对于稳定的欧亚大陆板块, 该区域及周缘的GPS观测速度值[4~5], 红色实线代表活动断裂[6]

    Figure  1.  Tectonic setting map around the Yangtze River Economic Belt

    图  2  长江经济带地区岩石圈不同深度温度场

    Figure  2.  Temperature distribution at different depths of the lithosphere in the Yangtze River Economic Belt

    图  3  长江经济带地区各个剖面岩石圈温度、强度和等效粘滞性系数分布(剖面位置见图 1)

    Figure  3.  Distributions of temperature, strength and viscosity of the lithosphere at different profiles in the Yangtze River Economic Belt

    图  4  长江经济带地区岩石圈不同深度的强度分布

    Figure  4.  Lithospheric strength distribution at different depths in the Yangtze River Economic Belt

    图  5  长江经济带地区岩石圈不同深度的等效粘滞性系数分布

    Figure  5.  Viscosity distribution at different lithospheric depths in the Yangtze River Economic Belt

    图  6  长江经济带地区及周缘深部地震层析成像结果[25](剖面沿着北纬30°)

    Figure  6.  Deep seismic tomography results in the Yangtze River Economic Belt and adjacent area

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  • 收稿日期:  2016-03-06
  • 刊出日期:  2016-09-01

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