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首页> 外文期刊>Journal of Asian earth sciences >Cenozoic deformation in western Yunnan (China-Myanmar border)
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Cenozoic deformation in western Yunnan (China-Myanmar border)

机译：滇西（中缅边界）新生代变形

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摘要

In the present paper, we describe ductile and brittle deformation styles in western Yunnan and HE Myanmar, using field data and Landsat 7 imagery. We show that this complex area located at the northern termination of Sunda Plate (Three Rivers area) was wedged during the Tertiary between the left-lateral Ailao Shan/Chong Shan metamorphic belts to the east and the right-lateral Shan scarp/Gaoligong metamorphic belt in west. This triangular region therefore underwent the effects of these continental size ductile strike-slip faults separating major blocks with a dominant EW to ENE compression. Since the Late Miocene, date of the reversal of motion along the RRF, the incipient eastward motion of the Sunda block and the persisting right-lateral motion along its western boundary (Sagaing fault) created N-S compression and E-W to WNW extension underlined by left-lateral transtension along the Wanding/Nanting fault zones. At the same time, the Diangcan Shan, situated along strike the Ailao Shan metamorphic belt, was slightly impinged by the blocks extruded from the syntaxis and exhumed again from the Early Pliocene in accordance with this late and still active state of stress.
机译：在本文中，我们使用野外数据和Landsat 7影像描述了滇西和缅甸南部的韧性和脆性变形样式。我们表明，位于Sun达板块北端（三河地区）的这一复杂区域在第三纪楔入东部的左侧哀牢山/重山变质带与右侧的山陡坡/高黎贡变质带之间在西部。因此，该三角形区域受到了这些大陆性延性走滑断层的影响，这些断层将具有主要EW到ENE压缩作用的主要区块分开。自中新世晚期以来，沿着RRF的运动发生逆转的日期，Sunda块开始向东运动以及沿其西边界的持续右旋运动（实皆断层）造成了NS压缩和EW向WNW扩展，并以左下划线强调万丁/南亭断层带的横向张开。同时，沿着哀牢山变质带走向的迪安坎山受到了从语法上挤压出的块体的轻微撞击，并根据这种晚期且仍然活跃的应力状态从上新世再次挖掘出。

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