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TZID:Europe/Paris
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UID:67@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260226T130000
DTEND;TZID=Europe/Paris:20260226T140000
DTSTAMP:20260223T141328Z
URL:https://osups.universite-paris-saclay.fr/calendrier/exploration-of-the
 -primitive-crust-of-mars-in-the-regolithic-breccia-nwa-7533/
SUMMARY:Exploration of the primitive crust of Mars in the regolithic brecci
 a NWA 7533
DESCRIPTION:Nous aurons le plaisir d’accueillir Virgile Malarewicz le jeu
 di 26 février à 13h dans l’amphithéâtre du rez-de-chaussée de l’I
 nstitut Pascal\, bâtiment 530\, pour un séminaire intitulé : ” Mars
 ’ primitive crust explored in the regolith breccia NWA 7533“.\n\nRésu
 mé :\n\nThe oldest documented Martian meteorite\, the regolithic breccia 
 NWA 7533\, offers a unique window into the history of the primitive Martia
 n crust. Its exceptional mineralogical diversity allow us to better constr
 ain a period for which very little direct evidence remains: the pre-Noachi
 an (&gt\; 4.0 Ga). New fragments of this meteorite have revealed the first
  magmatic quartz identified on Mars\, constituting lithological fragments 
 of granitic composition. In addition to being the most differentiated rock
 s detected to date on Mars\, isotopic analyses (δ³⁰Si and δ¹⁸O) su
 ggest that they formed from previously altered material. At the same time\
 , systematic chemical and structural characterization of around 100 zircon
 s present in the breccia\, dated to more than 4.4 Ga\, reveals atypical te
 xtures that had not been described previously. These textures are interpre
 ted as traces of early hydrothermal alteration within the Martian crust. A
 ll of these observations point to the existence of a primitive Martian cru
 st that was already highly diversified\, marked by complex magmatic and hy
 drothermal processes. These results pave the way for comparisons with the 
 ancient Earth’s crust\, particularly regarding the existence of these pa
 rticular textures on ancient terrestrial zircons.\n
CATEGORIES:Séminaires
LOCATION:GEOPS\, Bât. 504 Rue du Belvédère\, Orsay\, 91400\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât. 504 Rue du Belvédèr
 e\, Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=GEOPS:geo:0,0
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