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首页> 外文期刊>Journal of South American earth sciences >The buried southern continuation of the Oaxaca-Juarez terrane boundary and Oaxaca Fault, southern Mexico: Magnetotelluric constraints
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The buried southern continuation of the Oaxaca-Juarez terrane boundary and Oaxaca Fault, southern Mexico: Magnetotelluric constraints

机译：墨西哥南部瓦哈卡-华雷斯地形边界和瓦哈卡断层的南部埋藏延续：大地电磁约束

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摘要

Thirty magnetotelluric soundings were made along two NW-SE profiles to the north and south of Oaxaca City in southern Mexico. The profiles crossed the N-S Oaxaca Fault and the Oaxaca-Juarez terrane boundary defined by the Juarez mylonitic complex. Dimensionality analysis of the MT data showed that the subsurface resistivity structure is 2D or 3D. The Oaxaca and correlative Guichicovi terranes consist of ca. 1—1.4 Ga granulitic continental crust overlain by Phanerozoic sedimentary rocks, characterized by high and low resistivities, respectively. The Juarez terrane consists of oceanic Mesozoic metavolcanic and metasedimentary rocks, characterized by a low to medium resistivity layer, that is approximately 10 km thick. The Oaxaca Fault is a Cenozoic aged, normal fault that reactivated the dextral and thrust Juarez mylonitic complex north of Oaxaca City: its location south of Oaxaca City is uncertain. In the southern profile, the MT data show a ca. 20—50 km wide, west-dipping, relatively low resistivity zone material that extends through the entire crust. This is inferred to be the Juarez terrane bounded on either side by the ca. 1—1.4 Ga granulites. The Oaxaca Fault is imaged only by a major electrical resistivity discontinuity (low to the west, high to the east) along both the western border of the Juarez mylonitic complex (northern profile) and the San Miguel de la Cal mountains (southern profile) suggesting continuity.
机译：沿着墨西哥南部瓦哈卡市北部和南部的两个NW-SE剖面进行了三十次大地电磁测深。剖面越过N-S瓦哈卡断层和由华雷斯Mylonitic复杂体定义的瓦哈卡-华雷斯地层边界。 MT数据的维数分析表明，地下电阻率结构为2D或3D。 Oaxaca和相关的Guichicovi地体由ca组成。 1—1.4 Ga砾岩状陆壳，覆盖有生代沉积岩，分别具有高电阻率和低电阻率。华雷斯地体由大洋中生界火山岩和沉积沉积岩组成，其特征是具有低至中等电阻率层，其厚度约为10 km。瓦哈卡断层是新生代的正常断层，它重新激活了瓦哈卡市以北的右旋和逆冲华雷斯杂岩体复合体：它在瓦哈卡市以南的位置尚不确定。在南部剖面中，MT数据显示约。宽20至50公里，向西倾斜，电阻率较低的区域材料，贯穿整个地壳。推断这是在左右两边都被ca界定的Juarez地形。 1—1.4 Ga颗粒。瓦哈卡断层仅由沿华雷斯Mylonitic复合体的西边界（北剖面）和圣米格尔-德拉卡尔山脉（南剖面）的主要电阻率不连续性（从西低，向东高）成像。连续性。

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