Abstract In this study, the crust and upper mantle density distribution across the Iranian plateau along a ~1500 km profile are investigated using an integrated modeling of potential field data (gravity, geoid and topography) and by assuming local isostatic equilibrium. Our profile is initiated in Arabian platform and running through the main geological structures of Iran including Zagros orogen, Sanandaj – Sirjan Zone (SSZ), Urumieh – Dokhtar Magmatic Arc (UDMA), Central Iran (CI) block, Tabas/Lut blocks, and East Iranian Range (EIR). In the second step, in order to verify the integrated model, the 1–D S–wave absolute velocities for the crust and upper mantle beneath 21 seismic stations which partially covered the density profile are obtained using the joint inversion of P–receiver function (PRF) and surface–wave dispersion data. Our results indicate a thick crust (~60 km) beneath the SSZ and UDMA which thinning toward the east and experienced its minimum value (~40 km) beneath the central Iran, as well as Tabas/Lut blocks. Moreover, a thick lithosphere (>150 km) is observed under the Zagros, SSZ and parts of the UDMA, whereas a thinner lithosphere (~120 km on average in velocity model) is presented under the most of our profile. Both density and velocity models indicate a lithospheric thinning toward the CI block which imply the slab breakoff or lithospheric delamination followed by the upwelling of the asthenosphere in the Neogene. The presence of a relative fast structure in the crust beneath the Tabas block which is coinciding with a shallow high velocity body in the uppermost mantle elucidates a signature of former oceanic crust, which disappeared after the collision of Lut and Afghan continental blocks and E-directed subduction of Neotethys under the Afghan microcontinent either in post-Albian or middle Eocene times.

中文翻译：

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位场和地震数据解析的伊朗高原二维地壳和上地幔结构成像

摘要 在这项研究中，使用势场数据（重力、大地水准面和地形）的综合建模并假设局部均衡平衡，研究了沿约 1500 公里剖面横跨伊朗高原的地壳和上地幔密度分布。我们的剖面起始于阿拉伯平台，贯穿伊朗的主要地质构造，包括扎格罗斯造山带、萨南达杰 – Sirjan 区 (SSZ)、乌鲁米耶 – Dokhtar 岩浆弧 (UDMA)、伊朗中部 (CI) 区块、塔巴斯/卢特区块和东伊朗山脉（EIR）。第二步，为了验证综合模型，利用P-接收函数（PRF）的联合反演，获得了部分覆盖密度剖面的21个地震台站下地壳和上地幔的1-DS-波绝对速度。 ) 和表面波色散数据。我们的结果表明 SSZ 和 UDMA 下方有一个厚地壳（~60 公里），它向东变薄，并在伊朗中部以及 Tabas/Lut 地块下方经历了最小值（~40 公里）。此外，在 Zagros、SSZ 和部分 UDMA 下观察到厚岩石圈（> 150 公里），而在我们的大部分剖面下呈现出较薄的岩石圈（速度模型平均约 120 公里）。密度和速度模型都表明岩石圈向 CI 块变薄，这意味着板块断裂或岩石圈分层，随后是新近纪软流圈的上升流。塔巴斯地块下方地壳中存在相对快速的结构，与最上地幔中的浅层高速体相吻合，阐明了前大洋地壳的特征，