A switch from horizontal compression to vertical extension in the vrancea slab explained by the volume reduction of serpentine dehydration

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SUMMARY

    To observe the stress field evolution with depth (Fig 2) and the associated distribution of focal mechanisms, the authors divided them into 10-km thick depth intervals. At depths > 140 km, where the dehydration of the 10-Å phase (or other minerals such as phase A) is characterized by a positive Clapeyron s­ lope9, focal mechanisms indicate a compressional stress field and R decreases. The limited delamination of the Carpathian ­lithosphere20 that induced slab v­ erticalization4,62 has resulted in a relatively simple slab geometry, which helps the visualization of the potential impact of dehydration . . .

     

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