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UID:20250626T231911EDT-3233cJCtZ1@132.216.98.100
DTSTAMP:20250627T031911Z
DESCRIPTION:Dr Brice LaCroix\, Kansas State University\n\n \n\nThe Enigma o
 f the Nacimiento Block of Central California: Where Is the Slabless Window
 ?\n\n \n\nMardi 7 novembre 2023 à 12h30 - Tuesday\, November 7\, 2023 at 1
 2:30 pm\n\nLocal PK-7605\, 7e étage\, 201 ave. du Président-Kennedy\n\nPou
 r assister en vidéoconférence via Zoom: https://uqam.zoom.us/j/83216327466
 ?pwd=WnZJNldCaS8xL1M4VDdadUVENHQ1dz09\n\nRésumé / abstract:\n\nThe Nacimie
 nto block\, an exhumed assemblage of an accretionary complex formed by the
  subduction of the Farallon oceanic plate under the western margin of Nort
 h America\, is enigmatic as it is affected by post-metamorphic thermal ano
 maly\, hydrothermal activity leading to the formation of the Los Burros go
 ld deposit\, and high landslide activity.\n\nIn order to document the impo
 rtant vertical uplift of the area\, we present a novel approach for mappin
 g vertical uplifts in exhumed metasedimentary rocks by coupling Raman spec
 troscopy of carbonaceous material with (U-Th)/He thermochronometry on apat
 ite and zircon. We apply this approach to carbonaceous metasedimentary roc
 ks of the Franciscan subduction complex\, exposed in the Nacimiento block 
 of central California\, USA\, an area that records high-pressure–low-tempe
 rature metamorphism prior to entrainment within the present-day transform 
 plate boundary We demonstrate that this approach\, combined with regional 
 structural observations\, can be used to map previously unrecognized trans
 pressive ridges and quantify the vertical crustal movement. We propose tha
 t the Nacimiento block is affected by a localized post-metamorphic thermal
  anomaly that corresponds to a localized transpressive deformation since c
 a. 25 Ma at an uplift rate of about 0.3 mm/yrs.\n
DTSTART:20231107T173000Z
DTEND:20231107T183000Z
SUMMARY:Geotop Seminars: Dr Brice LaCroix
URL:/eps/channels/event/geotop-seminars-dr-brice-lacro
 ix-352149
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