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A new tectonic map of the Iranian plateau based on aeromagnetic identification of magmatic arcs and ophiolite belts
Tectonophysics ( IF 2.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.tecto.2020.228588
Vahid Teknik , Hans Thybo , Irina M. Artemieva , Abdolreza Ghods

Abstract The Iranian plateau is one of the most complex geodynamic settings within the Alpine-Himalayan belt. The Paleo-Tethys and Neo-Tethys ocean subduction is responsible for the formation of several magmatic arcs and sedimentary basins within the plateau. These zones mostly are separated by thrust faults related to paleo-suture zones, which are highlighted by ophiolites. Sediment cover and overprint of a different magmatic phase from late Triassic to the Quaternary impede identification of some magmatic arcs and ophiolite belts. We track the known magmatic arcs, such as the Urmia-Dokhtar Magmatic Arc (UDMA), and unknown, sediment covered magmatic arcs by aeromagnetic data. We present a new map of average susceptibility calculated by the radially averaged power spectrum method. High average susceptibility values indicate the presence of a number of lineaments that correlate with known occurrences of Magmatic-Ophiolite Arcs (MOA), and low average susceptibility coincides with known sedimentary basins like Zagros, Makran, Kopeh-Dagh, and Tabas. In analogy to Zagros, low average susceptibility values indicate sedimentary basins to the south of the Darouneh fault and in the northern part of the Lut, Tabas and Yazd blocks. We interpret the Tabas basin as a pull-apart or back-arc basin. We identify hitherto unknown parallel MOAs in eastern Iran and the SE part of UDMA which both indicate steeply dipping (>60° dip) paleo-subduction zones. In contrast, we interpret shallow subduction (

中文翻译:

基于岩浆弧和蛇绿岩带航磁识别的伊朗高原新构造图

摘要 伊朗高原是阿尔卑斯-喜马拉雅带内最复杂的地球动力学环境之一。古特提斯和新特提斯洋俯冲导致了高原内几个岩浆弧和沉积盆地的形成。这些带大多被与古缝合带相关的逆冲断层分隔,这些断层以蛇绿岩突出。从晚三叠纪到第四纪不同岩浆相的沉积覆盖和叠印阻碍了某些岩浆弧和蛇绿岩带的识别。我们通过航磁数据跟踪已知的岩浆弧,例如乌尔米亚-多赫塔尔岩浆弧(UDMA)和未知的沉积物覆盖的岩浆弧。我们提出了通过径向平均功率谱方法计算的平均磁化率的新图。高平均磁化率值表明存在许多与已知岩浆蛇绿岩弧 (MOA) 发生相关的线条,而低平均磁化率与已知的沉积盆地相吻合,如 Zagros、Makran、Kopeh-Dagh 和 Tabas。与 Zagros 类似,低平均磁化率值表明 Darouneh 断层以南和 Lut、Tabas 和 Yazd 地块北部存在沉积盆地。我们将塔巴斯盆地解释为拉开盆地或弧后盆地。我们在伊朗东部和 UDMA 的东南部发现了迄今为止未知的平行 MOA,它们都表明了陡倾(>60°倾角)的古俯冲带。相反,我们解释浅俯冲(低平均敏感性与已知的沉积盆地相吻合,如 Zagros、Makran、Kopeh-Dagh 和 Tabas。与 Zagros 类似,低平均磁化率值表明 Darouneh 断层以南和 Lut、Tabas 和 Yazd 地块北部存在沉积盆地。我们将塔巴斯盆地解释为拉开盆地或弧后盆地。我们在伊朗东部和 UDMA 的东南部发现了迄今为止未知的平行 MOA,它们都表明了陡倾(>60°倾角)的古俯冲带。相反,我们解释浅俯冲(低平均敏感性与已知的沉积盆地相吻合,如 Zagros、Makran、Kopeh-Dagh 和 Tabas。与 Zagros 类似,低平均磁化率值表明 Darouneh 断层以南和 Lut、Tabas 和 Yazd 地块北部存在沉积盆地。我们将塔巴斯盆地解释为拉开盆地或弧后盆地。我们在伊朗东部和 UDMA 的东南部发现了迄今为止未知的平行 MOA,它们都表明了陡倾(>60°倾角)的古俯冲带。相反,我们解释浅俯冲(我们将塔巴斯盆地解释为拉开盆地或弧后盆地。我们在伊朗东部和 UDMA 的东南部发现了迄今为止未知的平行 MOA,它们都表明了陡倾(>60°倾角)的古俯冲带。相反,我们解释浅俯冲(我们将塔巴斯盆地解释为拉开盆地或弧后盆地。我们在伊朗东部和 UDMA 的东南部发现了迄今为止未知的平行 MOA,它们都表明了陡倾(>60°倾角)的古俯冲带。相反,我们解释浅俯冲(
更新日期:2020-10-01
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