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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Two-phase opening of Andaman Sea: a new seismotectonic insight
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Two-phase opening of Andaman Sea: a new seismotectonic insight

机译：安达曼海的两阶段开放：地震构造的新见解

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High-resolution reconstruction of Benioff zone depth-dip angle trajectory for Burma-Java subduction margin between 2degrees and 17degreesN Lat. reveals two major episodes of plate geometry change expressed as abrupt deviation in subduction angle. Estimation of effective rate of subduction in different time slices (and then length of subducted slab) allowed drawing of isochrones in Ma interval through these trajectories for the time period 5-12 Ma. With these isochrones, the deformation events on the subducting Indian plate are constrained in time as of 4-5 and 11 Ma old. This well-constrained time connotation offered scope for the correlation of slab deformation events with the well-established two-phase opening history of the Andaman Sea. While the 11 Ma event recorded from southern part of the study area is correlated with early stretching and rifting phase, the 4-5 Ma event is interpreted as major forcing behind the spreading phase of the Andaman Sea. Systematic spatio-temporal evaluation of Indian plate obliquity on the Andaman Sea evolution shows its definite control on the early rifting phase, initiated towards south near northwest Sumatra. The much young spreading phase recorded towards north of 7degrees Lat. is possibly the result of late Miocene-Pliocene trench retreat and follow-up transcurrent movement (along Sagaing and Sumatran fault system) with NW-SE pull-apart extension.Nonconformity between plate shape and subduction margin geometry is interpreted as the causative force behind Mid-Miocene intraplate extension and tearing. Enhanced stretching in the overriding plate consequently caused active forearc subsidence, recorded all along this plate margin. Initial phase of the Andaman Sea opening presumably remains concealed in this early-middle Miocene forearc subsidence history. The late Miocene-Pliocene pull-apart opening and spreading was possibly initiated near the western part of the Mergui-Sumatra region and propagated northward in subsequent period. A temporary halt in rifting at this pull-apart stage and northeastward veering of the Andaman Sea Ridge (ASR) are related with uplifting of oceanic crust in post-middle Miocene time in form of Alcock and Sewell seamounts, lying symmetrically north and south of this spreading ridge. (C) 2004 Elsevier B.V. All rights reserved.
机译：贝尼奥夫带深度倾角轨迹的高分辨率重建，用于2度到17度之间的缅甸爪哇俯冲裕度。揭示了两个主要的板块几何变化事件，表示为俯冲角突变。估计不同时间段内的俯冲有效速率（然后是俯冲平板的长度），可以通过这些轨迹画出Ma区间等时线，持续时间为5-12 Ma。利用这些等时线，俯冲印度板块上的变形事件在4-5岁和11 Ma年以前就受到时间的限制。这种时间紧迫的时间内涵为平板变形事件与安达曼海建立良好的两相开放历史的相关性提供了范围。虽然从研究区南部记录到的11 Ma事件与早期伸展和裂谷期有关，但4-5 Ma事件被认为是安达曼海扩散期之后的主要强迫。对印度板块倾角对安达曼海演化的系统时空评价表明，它对早期裂谷阶段的确定控制，该阶段始于苏门答腊西北部附近的南部。朝南纬7度以北记录的年轻期传播期。可能是中新世-上新世后缘退缩和后续横流运动（以及Sagaing和Sumatran断层系统）和NW-SE拉分伸展的结果。 -中新世板内延伸和撕裂。因此，在上覆板中增强的拉伸作用导致活跃的前臂沉降，沿该板边缘一直记录下来。在中新世前中部早沉历史​​中，安达曼海开口的初始阶段可能仍被隐藏。中新世-上新世晚期的拉开和扩展可能是在梅尔吉-苏门答腊地区西部附近开始的，并在随后的时期向北传播。在这个拉开阶段的裂谷暂时停止和安达曼海脊（ASR）的东北转向与中新世中期后的洋壳以Alcock和Sewell海山的形式隆升有关蔓延的山脊。 （C）2004 Elsevier B.V.保留所有权利。

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