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Some escaped subduction and may be good places to study oceanic processes (e.g., Slave Province, Corcoran, 2000 Nicasio Reservoir Terrane, Schnur and Gilbert, 2012). As earlier mentioned, preserved fossil examples of seamounts are rare.
![serial roze siah part 260 serial roze siah part 260](http://tvshow98.com/farsi1/baradar-va-khaharam_1.jpg)
Therefore, understanding how they form and evolve is critical to assess natural hazards such as subduction earthquakes, volcanic activity, or slope instabilities that may result in tsunamis ( Lipman et al., 1988 Keating and McGuire, 2000).Įxposed examples of fossil seamounts are therefore paramount to directly access a several million-year-long history on ocean floor and in a subduction zone, as well as internal deformation and metamorphism. There are more than 100,000 seamounts on present-day seafloor ( Hillier and Watts, 2007 Wessel et al., 2010) most of these seamounts will at some point enter subduction zones (e.g., Lallemand et al., 1989 Ranero and von Huene, 2000). Although most seamounts were recognized in the early stages of plate tectonics as products of mantle upwelling at hotspots ( Wilson, 1965 Morgan, 1971), many of them also form by hydration-driven melting of the forearc mantle of subduction zones (e.g., Reagan et al., 2010) or close to ocean ridges (e.g., East Pacific Rise seamounts, Niu et al., 1999). Seamounts are “geographically isolated topographic feature on the seafloor taller than 100 m, including ones whose summit regions may temporarily emerge above sea level, but not including features that are located on continental shelves or that are part of other major landmasses” ( Staudigel et al., 2010). Finally, we discuss the nature of high-pressure fluid circulation preserved in this seamount. Extensive examination of the seismogenic potential of the Siah Kuh seamount reveals that it was not a large earthquake asperity (despite the report of a rare example of cm-scale, high-pressure pseudotachylyte in this study), and that it possibly behaved as a barrier to earthquake propagation. In particular, we constrain different stages of metamorphism and associated mineralogy, with precise conditions for subduction-related metamorphism around 250 ☌ and 0.7 GPa, in the middle of the seismogenic zone.
SERIAL ROZE SIAH PART 260 SERIES
Through a series of sections across the whole massif and the combination of magmatic-metamorphic-sedimentary petrological data, we document several distinct stages associated with seamount build-up on the seafloor and with subduction. We herein report on a fully exposed, 3D example of seamount that we discovered in the Siah Kuh massif, Southern Iran. Since geophysical studies mostly reach the shallowest subducted seamounts and miss internal structures due to low resolution, there is a high need for fossil seamount exposures.
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How they are metamorphosed and deformed is, however, critical to understand how seamount subduction can impact subduction zone geometry, fluid circulation or seismogenic conditions, and more generally to trace physical conditions along the subduction boundary. Millions of seamounts on modern and past seafloor end up being subducted, and only small pieces are recovered in suture zones.