COmoros & maYotte : vOlcanism, TEctonics and Seismicity

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phd:start [2020/06/18 11:28] – i.thinon_brgm.frphd:start [2021/02/23 09:21] (Version actuelle) – i.thinon_brgm.fr
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 ==== WP1:  "Mechanical coupling between seismotectonic and volcanic activity at lithosphere scale" ==== ==== WP1:  "Mechanical coupling between seismotectonic and volcanic activity at lithosphere scale" ====
  
 +**Pierre BOYMOND** {{:theses:boymond-pierre.png?nolink&150 |}}
  
 **Advisor:** Feuillet Nathalie (IPGP) **Advisor:** Feuillet Nathalie (IPGP)
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 **Funding:** ANR COYOTES **Funding:** ANR COYOTES
  
-**Summary**+**Summary:**
 On May 2018, the Island of Mayotte (Comoros, Indian Ocean) was struck by several Magnitude 5+ earthquakes as a On May 2018, the Island of Mayotte (Comoros, Indian Ocean) was struck by several Magnitude 5+ earthquakes as a
 result of a magmatic intrusion across the whole lithosphere (Lemoine et al., 2020, Cesca et al., 2020, Feuillet et al., 2019). This magmatic activity gave birth to a large deep-sea volcanic edifice (Feuillet et al., 2019). Such deep magmatic sources and diking in the brittle mantle were never documented by geophysical data before. High-resolution marine data were acquired offshore Mayotte Island during several marine cruises in 2019 and 2020 ((Mayobs cruises, Feuillet et al., 2019). Those data revealed that the new volcanic edifice of Mayotte was built at the tip of a NW-SE trending volcanic ridge (Mayotte ridge). This ridge is composed by dozens of volcanic edifices as a result of multiple magmatic intrusions along a NW-SE extensional tectonic structure (Feuillet et al., 2019). This structure opens at the scale of the whole lithosphere to transfer the strain between the East african rift offshore branches and the Madagascar graben, and serves as pathways for the magma straddling at the lithosphere asthenosphere boundary. result of a magmatic intrusion across the whole lithosphere (Lemoine et al., 2020, Cesca et al., 2020, Feuillet et al., 2019). This magmatic activity gave birth to a large deep-sea volcanic edifice (Feuillet et al., 2019). Such deep magmatic sources and diking in the brittle mantle were never documented by geophysical data before. High-resolution marine data were acquired offshore Mayotte Island during several marine cruises in 2019 and 2020 ((Mayobs cruises, Feuillet et al., 2019). Those data revealed that the new volcanic edifice of Mayotte was built at the tip of a NW-SE trending volcanic ridge (Mayotte ridge). This ridge is composed by dozens of volcanic edifices as a result of multiple magmatic intrusions along a NW-SE extensional tectonic structure (Feuillet et al., 2019). This structure opens at the scale of the whole lithosphere to transfer the strain between the East african rift offshore branches and the Madagascar graben, and serves as pathways for the magma straddling at the lithosphere asthenosphere boundary.
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 Competencies required: Mechanics, physics, computing, modeling. Strong background in geophysics and geology Competencies required: Mechanics, physics, computing, modeling. Strong background in geophysics and geology
  
-{{ :thesis:phd:phd_coyotes-wp1.pdf |}} |Proposal of the phD}}+{{ :phd:phd_coyotes-wp1_ipgp.pdf | Subjet of the thesis}} 
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 ==== WP2:  "Volcanism and tectonics of the Comoros archipelago: a link with northern Madagascar and the East-African Rift System ?" ==== ==== WP2:  "Volcanism and tectonics of the Comoros archipelago: a link with northern Madagascar and the East-African Rift System ?" ====
  
- +** Anais RUSQUET** {{:theses:rusquet_anais.jpg?nolink&150 |}}
-**Keywords:** Comoros archipelago, hotspot volcanism, lithospheric deformation, regional tectonics, plate boundary, Lwandle plate, Somalia plate, East-African Rift System, geochronology, isotopic geochemistry+
  
 **Supervision:** Laurent Michon, professor (50%); Vincent Famin, associate professor HDR (50%) **Supervision:** Laurent Michon, professor (50%); Vincent Famin, associate professor HDR (50%)
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 **Collaborations:** Xavier Quidelleur (GEOPS, Paris Saclay), François Nauret (LMV, Clermont-Ferrand) **Collaborations:** Xavier Quidelleur (GEOPS, Paris Saclay), François Nauret (LMV, Clermont-Ferrand)
  
-**Location:** Position based in Saint-Denis, Laboratoire Géosciences Réunion (LGSR), university of Réunion Island. LGSR is member of the Institut de Physique du Globe de Paris (IPGP)+**Host lab/ Team:** Laboratoire Géosciences Réunion (LGSR), university of Réunion Island/IPGP
  
 **Funding:** ANR COYOTES, INSU Tellus MAYVOLTE, INTERREG HATARI. **Funding:** ANR COYOTES, INSU Tellus MAYVOLTE, INTERREG HATARI.
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 The PhD thesis is funded by the french national program ANR COYOTES involving several french laboratories. A strong collaboration is expected among teams as other PhD students will work on the Comoros geodynamics with complementary methods. The PhD thesis is funded by the french national program ANR COYOTES involving several french laboratories. A strong collaboration is expected among teams as other PhD students will work on the Comoros geodynamics with complementary methods.
  
-{{ :thesis:phd_coyotes-wp2.pdf |Proposal of the phD}}+{{ :phd:phd_coyotes-wp2.pdf |Subjet of the thesis}} 
 + 
 +**Keywords:** Comoros archipelago, hotspot volcanism, lithospheric deformation, regional tectonics, plate boundary, Lwandle plate, Somalia plate, East-African Rift System, geochronology, isotopic geochemistry
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 ==== WP3:  "Magmatism, inheritance and deformation around the Comoros and Mayotte archipelago in the Somali Basin. Geodynamic implications" ==== ==== WP3:  "Magmatism, inheritance and deformation around the Comoros and Mayotte archipelago in the Somali Basin. Geodynamic implications" ====
  
-**Keywords:** North Mozambique channel, Ocean-Continent transition, inheritance, deformation, regional tectonics, multichannel reflection seismic (processing and interpretation), magnetism, gravity.+**Charles MASQUELET** {{:theses:masquelet_charles.jpeg?nolink&150 |}}
  
 **Supervision:** Sylvie LEROY (ISTeP) ; Daniel SAUTER (EOST) **Supervision:** Sylvie LEROY (ISTeP) ; Daniel SAUTER (EOST)
  
 **Co-supervision:** Nicolas CHAMOT-ROOKE (ENS); Isabelle THINON (BRGM) **Co-supervision:** Nicolas CHAMOT-ROOKE (ENS); Isabelle THINON (BRGM)
 +
 +**Host lab/ Team:** ISTeP - Sorbonne University
  
 **Funding:** ANR COYOTES **Funding:** ANR COYOTES
  
-**Summary**+**Summary:**
  
-{{ :thesis:sujet_de_these_coyotes-wp3.pdf | Proposal of the phD (french version)}}+{{ :phd:sujet_de_these_coyotes-wp3.pdf |Subjet of the thesis (french version)}}
  
 +**Keywords:** North Mozambique channel, Ocean-Continent transition, inheritance, deformation, regional tectonics, multichannel reflection seismic (processing and interpretation), magnetism, gravity.
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