Crustal structures across the central Kaapvaal craton from deep-seismic reflection data

2004 ◽  
Vol 107 (1-2) ◽  
pp. 185-206 ◽  
Author(s):  
M. de Wit
Keyword(s):  
Seismic Reflection ◽  
Kaapvaal Craton ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data ◽  
Crustal Structures

Crustal Structure of Turkey from Aeromagnetic, Gravity and Deep Seismic Reflection Data

2012 ◽  
Vol 33 (5) ◽  
pp. 869-885 ◽  
Author(s):  
Abdullah Ates ◽  
Funda Bilim ◽  
Aydin Buyuksarac ◽  
Attila Aydemir ◽  
Ozcan Bektas ◽  
...  
Keyword(s):  
Crustal Structure ◽  
Seismic Reflection ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data

scholarly journals Improved Interpretation of Deep Seismic Reflection Data in Areas of Complex Geology Through Integration With Passive Seismic Data Sets

2018 ◽  
Vol 123 (12) ◽  
pp. 10,810-10,830
Author(s):  
Michael Dentith ◽  
Huaiyu Yuan ◽  
Ruth Elaine Murdie ◽  
Perla Pina-Varas ◽  
Simon P. Johnson ◽  
...  
Keyword(s):  
Seismic Data ◽  
Seismic Reflection ◽  
Data Sets ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data ◽  
Passive Seismic ◽  
Complex Geology

scholarly journals Variation of Moho Depth across Bangong-Nujiang Suture in Central Tibet—Results from Deep Seismic Reflection Data

2015 ◽  
Vol 06 (08) ◽  
pp. 821-830 ◽  
Author(s):  
Zhanwu Lu ◽  
Rui Gao ◽  
Hongqiang Li ◽  
Wenhui Li ◽  
Xiaosong Xiong
Keyword(s):  
Seismic Reflection ◽  
Moho Depth ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data ◽  
Central Tibet

Mantle degassing in a collisional zone: Subduction types A & B in the Central Mediterranean

2020 ◽  
Author(s):  
Antonio Caracausi ◽  
Attilio Sulli ◽  
Maurizio Gasparo Morticelli ◽  
Marco Pantina ◽  
Paolo Censi ◽  
...  
Keyword(s):  
Seismic Reflection ◽  
Mantle Wedge ◽  
Geochemical Data ◽  
Etna Volcano ◽  
Central Mediterranean ◽  
Seismic Reflection Data ◽  
Deep Seismic Reflection ◽  
Reflection Data ◽  
Mantle Fluids ◽  
Mantle Volatiles

<p>The central Mediterranean is a very complex area constituted by a puzzle of different lithosphere segments, whose geological evolution is controlled by the interaction between the European and African plates. Within this geological domain, the northern Sicily continental margin and adjacent coastal belt represent a link between the Sicilian chain and the Tyrrhenian extensional (back-arc) area in the north-south direction, whereas in the east-west direction a transition from a subduction type B (Ionian-Tyrrhenian) to a continental collisional system, subduction type A, (Sicilian-Maghrebian Chain) is recognized.</p><p>The structure of the lithosphere in this area is matter of a strong debate. Most uncertainties on the geologic evolution of the boundary between the European and African plate at depth rise from the lack, up to now, of constraints and clear evidence of geometry of the lithosphere down to the crust-mantle interface.</p><p>In order to investigate the regional crust-mantle tectonics, here we discuss recent deep seismic reflection data, gravimetric modelling, the regional fluid geochemistry coupled to the seismicity that clearly indicate presence, along this sector of the Central Mediterranean, of a hot mantle-wedging at about 28 km of depth. This wedge lies just below a thick-skinned deformed belt cut by a dense system of faults down to the Mohorovicic discontinuity.</p><p>We also discuss new geochemical data in mineralization (fluorite) of hydrothermal deposits along the main regional faults above the mantle wedge. The mineralization is strongly enriched in saline fluid inclusions that allowed high precision analyses of the trapped volatiles (H<sub>2</sub>O, CO<sub>2</sub> and noble gases).</p><p> Notwithstanding the region is far from any evidence of volcanism (Etna volcano and Aeolian Islands are in about 80km), the new geochemical data highlight the presence of mantle-derived volatiles that degas through the crust (e.g., He isotopes, up to 1.4Ra, Ra is the He isotopic ratio in atmosphere). An excess of heat sourced from the mantle characterizes the region. This is a rare case of occurrence of mantle volatiles together with heat in a collisional system.</p><p>The active regional seismicity indicates that the mantle fluids move from the mantle wedge to the surface, hence across the ductile crust that could be thought as a barrier to the advective transfer of fluids because of its low permeability on long time scales. Here we reconstruct the deep faults by the deep seismic reflection data that works as a network of pathways that actively sustains the advective transfer of the mantle fluids through the entire continental crust.     </p><p>Finally, the new geochemical data strongly supports that 1) the mantle wedge and possible associated magmatic intrusions as the source of the mantle volatiles outgassing in the region. A comparison of the noble gases isotopic signature of fluids coming from the mantle wedge and those emitted from the Mt Etna volcano furnish new constrain on the mantle composition below the central Mediterranean getting new constrains to the processes that controlled the geodynamic evolution of the central Mediterranean (i.e., delamination processes).</p>

Sign in / Sign up

Export Citation Format

Share Document