青藏高原东缘和东南缘上地幔间断面结构:腾冲板内火山起源和扬子克拉通西部岩石层拆沉约束

R. Q. Zhang; Y. Wu; Z. Y. Gao; Y. Y. V. Fu; L. Sun; Q. J. Wu; Z. F. Ding; 肖勇; 朱敏; 张瑞青

doi:10.16738/j.cnki.issn.1003-3238.201904002

青藏高原东缘和东南缘上地幔间断面结构:腾冲板内火山起源和扬子克拉通西部岩石层拆沉约束

基金项目:
国家自然科学基金(41874073)项目资助

摘要: 利用两个密集流动宽频带地震台阵观测资料,采用P波接收函数方法,获得了青藏高原东缘和东南缘的上地幔过渡带结构。结果显示,与红河断裂东侧地区相比,断裂以西地区,410-km和660-km间断面埋深均下沉。两个间断面的同时下沉可用过渡带上方的上地幔温度的横向变化来解释,推测红河断裂可能深至上地幔顶部,将印支和华南板块分开。红河断裂以西腾冲火山地区下方,其过渡带厚度接近于全球平均值,暗示该板内火山不是源于过渡带内停滞板片的脱水作用,而是与东向俯冲的印度板块在上地幔较浅深度发生的板内撕裂有关。在扬子克拉通西部地区,660-km间断面明显下沉,导致过渡带增厚达20km。这种增厚可能反映过渡带内存在岩石层拆沉残留,因而温度要低,而岩石层拆沉可能与上覆软流圈地幔的侧向流有关。此外,我们还发现四川盆地大部分地区下方过渡带厚度基本接近于全球平均值。

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