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首页> 外文期刊>Journal of Asian earth sciences >New insights into regional tectonics of the Sunda-Banda Arcs region from integrated magnetic and gravity modelling
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New insights into regional tectonics of the Sunda-Banda Arcs region from integrated magnetic and gravity modelling

机译：集成磁和引力模型对Sun他-班达弧地区区域构造的新见解

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摘要

The Lombok Island (Indonesia), situated along the Sunda-Banda Arcs transition region, lies between zones characterized by very large intensity magnetic anomalies. These anomalies have been noted as being part of the eight most important ones seen on the 1 st edition of the World Digital Magnetic Anomaly Map. Unfortunately, only marine magnetic data of surroundings are available, and no regional high-resolution magnetic surveys of this island had been done. Since 2004, we have carried out several geomagnetic ground surveys in this region. Here, we present modelling results for a new geological and tectonic interpretation of the magnetic anomalies. The new results confirm the general pattern of contiguous negative-positive anomalies, revealing two active Quaternary normal faults and a magmatic arc related to a subduction region. This outcome agrees with earlier results in surrounding areas obtained by satellite, aeromagnetic, and marine platforms, and provides a more detailed picture of strong anomalies on this island. Considering both magnetic anomalies and gravity models, it is possible to suggest an extension of the Flores Thrust zone (reaching the northwest off the Lombok Island). The Flores Thrust zone may be considered as a mature subduction in the back arc region, showing a tendency of progressive subduction during last decades.
机译：位于Sun达-班达弧过渡区的龙目岛（印度尼西亚）位于以非常大的磁异常为特征的区域之间。这些异常是世界数字磁异常图第一版中最重要的八个异常的一部分。不幸的是，仅可获得周围环境的海洋磁数据，而尚未对该岛进行区域高分辨率的磁测。自2004年以来，我们在该地区进行了几次地磁地面调查。在这里，我们介绍了磁异常的新地质和构造解释的建模结果。新的结果证实了连续的负正异常的一般模式，揭示了两个活跃的第四纪正断层和一个与俯冲区域有关的岩浆弧。这一结果与通过卫星，航空电磁和海洋平台获得的周边地区的早期结果相符，并提供了该岛上强烈异常的更详细的图片。考虑到磁异常和重力模型，有可能建议扩展弗洛雷斯推力区（到达龙目岛的西北方）。弗洛雷斯推力带可被认为是后弧区的成熟俯冲带，显示了近几十年来逐渐俯冲的趋势。

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