Subduction of the Nazca Ridge and the Inca Plateau: Insights into the formation of ore deposits in Peru
Subduction of the Nazca Ridge and the Inca Plateau: Insights into the formation of ore deposits in Peru
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DOI：
10.1016/j.epsl.2005.08.003
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发表时间：
2005-10
影响因子：
5.3
通讯作者：
G. Rosenbaum;D. Giles;M. Saxon;P. Betts;R. Weinberg;C. Duboz
中科院分区：
文献类型：
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作者：
G. Rosenbaum;D. Giles;M. Saxon;P. Betts;R. Weinberg;C. Duboz
秘鲁安第斯山脉中新世（15-5 Ma）形成的大量矿床与纳斯卡板块俯冲到南美板块之下有关。在这里，我们表明这些沉积物的时空分布与相对浮力地形异常的到来相对应，即秘鲁中部的纳斯卡山脊和秘鲁北部现在被消耗的印加高原，在俯冲带。板块重建显示，当地形异常到达俯冲沟时，成矿反应迅速。这一点可以从靠近山脊俯冲的横向迁移带的矿床群中看出。因此，与地震脊向俯冲带冲击有关的构造变化可能引发成矿丰富的俯冲上环境中矿床的形成。
A large number of ore deposits that formed in the Peruvian Andes during the Miocene (15–5 Ma) are related to the subduction of the Nazca plate beneath the South American plate. Here we show that the spatial and temporal distribution of these deposits correspond with the arrival of relatively buoyant topographic anomalies, namely the Nazca Ridge in central Peru and the now-consumed Inca Plateau in northern Peru, at the subduction zone. Plate reconstruction shows a rapid metallogenic response to the arrival of the topographic anomalies at the subduction trench. This is indicated by clusters of ore deposits situated within the proximity of the laterally migrating zones of ridge subduction. It is accordingly suggested that tectonic changes associated with impingement of the aseismic ridge into the subduction zone may trigger the formation of ore deposits in metallogenically fertile suprasubduction environments.