Crustal structure in the central Tethys realm

&amp;lt;p&amp;gt;The central Tethys realm including Anatolia, Caucasus and Iran is one of the most&amp;lt;br&amp;gt;complex geodynamic settings within the Alpine-Himalayan belt. To investigate the&amp;lt;br&amp;gt;tectonics of this region, we estimate the depth to magnetic basement (DMB) as a&amp;lt;br&amp;gt;proxy for the shape of sedimentary basins, and average crustal magnetic&amp;lt;br&amp;gt;susceptibility (ACMS) by applying the fractal spectral method to aeromagnetic data.&amp;lt;br&amp;gt;Magnetic data is sensitive to the presence of iron-rich minerals in oceanic fragments&amp;lt;br&amp;gt;and mafic intrusions hidden beneath sedimentary sequences or overprinted by&amp;lt;br&amp;gt;younger tectono-magmatic events. Furthermore, a seismically constrained 2D&amp;lt;br&amp;gt;density-susceptibility model along Zagros is developed to study the depth extent of&amp;lt;br&amp;gt;the tectonic structure.&amp;lt;br&amp;gt;Comparison of DMB and ACMS demonstrates that the structural complexity&amp;lt;br&amp;gt;increases from the Iranian plateau into Anatolia.&amp;lt;br&amp;gt;Strong ACMS show lineaments coincides with known occurrences of Magmatic-&amp;lt;br&amp;gt;Ophiolite Arcs (MOA) and weak ACMS zones coincide with known sedimentary&amp;lt;br&amp;gt;basins in the study region, including Zagros. Based on strong ACMS anomalies, we&amp;lt;br&amp;gt;identify hitherto unknown MOAs below the sedimentary cover in eastern Iran and in&amp;lt;br&amp;gt;the SE part of Urima-Dokhtar Magmatic Arc (UDMA). Our results allow for&amp;lt;br&amp;gt;estimation of the dip of the related paleo-subduction zones. Known magmatic arcs&amp;lt;br&amp;gt;(Pontides and Urima-Dokhtar) have high-intensity heterogeneous ACMS. We&amp;lt;br&amp;gt;identify a 450 km-long buried (DMB &amp;amp;gt;6 km) magmatic arc or trapped oceanic crust&amp;lt;br&amp;gt;along the western margin of the Kir&amp;amp;#351;eh&amp;amp;#305;r massif in Anatolia from a strong ACMS&amp;lt;br&amp;gt;anomaly. We identify large, partially buried magmatic bodies in the Caucasus LIP at&amp;lt;br&amp;gt;the Transcaucasus and Lesser Caucasus and in NW Iran. Strong ACMS anomalies&amp;lt;br&amp;gt;coincides with tectonic boundaries and major faults within the Iranian plateau while&amp;lt;br&amp;gt;the ACMA signal is generally weak in Anatolia. The Cyprus subduction zone has a&amp;lt;/p&amp;gt;&amp;lt;p&amp;gt;strong magnetic signature which extends ca. 500 km into the Arabian plate to the&amp;lt;br&amp;gt;south of the Bitlis suture.&amp;lt;br&amp;gt;We derive a 2D crustal-scale density-susceptibility model of the NW Iranian plateau&amp;lt;br&amp;gt;along a 500 km long seismic profile across major tectonic provinces of Iran from the&amp;lt;br&amp;gt;Arabian plate to the South Caspian Basin (SCB). A seismic P-wave receiver function&amp;lt;br&amp;gt;section is used to constrain major crustal boundaries in the density model. We&amp;lt;br&amp;gt;demonstrate that the Main Zagros Reverse Fault (MZRF), between the Arabian and&amp;lt;br&amp;gt;the overriding Central Iran crust, dips at ~13&amp;amp;#176; angle to the NE and extends to a depth&amp;lt;br&amp;gt;of ~40 km. The trace of MZRF suggests ~150 km underthrusting of the Arabian plate&amp;lt;br&amp;gt;beneath Central Iran. We identify a new crustal-scale suture beneath the Tarom&amp;lt;br&amp;gt;valley separating the South Caspian Basin crust from Central Iran. High density lower&amp;lt;br&amp;gt;crust beneath Alborz and Zagros may be related to partial eclogitization of crustal&amp;lt;br&amp;gt;roots at depths deeper than ~40 km.&amp;lt;/p&amp;gt;