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VERSION:2.0
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X-WR-CALNAME:Earth Planetary Science Seminar - Professor Martin Grove "The 
 thermal history of shallow subduction beneath the southern Sierra Nevada a
 nd broader implications for the tectonic evolution of the western North Am
 erican margin"".
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260714T131210Z
UID:tag:localist.com\,2008:EventInstance_53019986430977
DTSTART:20260609T190000Z
DTEND:20260609T201500Z
DESCRIPTION:The modern Sierra Nevada is underlain by some of the coldest co
 ntinental lithosphere on Earth. Despite voluminous 130-80 Ma arc magmatism
 \, subnormal heat flow has been recognized throughout the Sierra Nevada si
 nce the 1970’s. A comprehensive (n=125) thermal history analysis perform
 ed via K-feldspar thermochronology in the southern Sierra Nevada and adjac
 ent Mojave Desert from 5-30 km mid-Cretaceous crustal depths reveals T-t h
 istoriesdominated by subduction refrigeration between 80-75 Ma and continu
 ed subnormal geotherms thereafter. The pattern of cooling as a function of
  depth and distance from the trench agrees with numerical models of platea
 u subduction that predict substantial removal of subcontinental mantle lit
 hosphere and lower crust coupled with underplating of trench-derived sedim
 ent (Rand Schist). This argues against 10-0 Ma lower crustal delamination 
 of arc cumulates. The shallow subduction signature is at odds with overlap
  of magmatic arc segments required by most variants of the Baja-BC model w
 here a ~3000x250 km portion of British Columbia (Insular Terrane)thought t
 o be derived from southern and/or Baja California is postulated to have tr
 anslated north outboard of 100-80 Ma arc magmatism within the Sierra Nevad
 a.\n\nProfessor (Research) of Earth and Planetary Sciences
LOCATION:Building 320\, Geology Corner\, Room 220
SUMMARY:Earth Planetary Science Seminar - Professor Martin Grove "The therm
 al history of shallow subduction beneath the southern Sierra Nevada and br
 oader implications for the tectonic evolution of the western North America
 n margin"".
URL;VALUE=URI:https://events.stanford.edu/event/earth-planetary-science-sem
 inar-professor-martin-grove-the-thermal-history-of-shallow-subduction-bene
 ath-the-southern-sierra-nevada-and-broader-implications-for-the-tectonic-e
 volution-of-the-western-north-american-margin
CATEGORIES:Class/Seminar
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