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X-WR-CALNAME:Earth Planetary Science Seminar - Dr. Kuan-Yu Lin "Record of o
 n-axis gabbro emplacement at the Atlantis Massif oceanic core complex and 
 its tectonic and hydrothermal implications ".
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260911T011026Z
UID:tag:localist.com\,2008:EventInstance_53019920446316
DTSTART:20260602T190000Z
DTEND:20260602T201500Z
DESCRIPTION:The extent to which off-axis hydrothermal activity at slow-spre
 ading ridges relies on proximal magmatism remains unresolved\, as exemplif
 ied by the debate surrounding the origin of the Lost City Hydrothermal Fie
 ld (LCHF). The LCHF is hosted by the Atlantis Massif oceanic core complex 
 (30˚N\, Mid-Atlantic ridge)\, which consists of tectonically exhumed peri
 dotites interleaved with gabbroic intrusions. If these gabbros intruded of
 f-axis into cold lithosphere\, they may be linked to late-stage magmatism 
 that served as a local heat source for the LCHF. We test this off-axis-emp
 lacement hypothesis by coupling pyroxene- and olivine-based thermometers t
 o constrain the cooling rates of peridotites and gabbros recovered from de
 ep boreholes on the Atlantis Massif. We observe that gabbroic intrusions m
 odify host peridotite chemistry but not peridotite cooling rates. Gabbro c
 ooling rates are consistent with those of adjacent peridotites when adjust
 ed for olivine and pyroxene grain sizes. Similar cooling rates between lit
 hologies across the massif suggest that these gabbros were emplaced deep\,
  on-axis and were then co-exhumed with the peridotites by the detachment f
 ault along a similar P-T pathway. Our results support existing tectonic mo
 dels that suggest deep (>7 km) crustal growth at the root of the detachmen
 t fault\, as well as hydrothermal models that invoke deep fluid flow\, not
  magmatic heat\, to sustain the LCHF.\n\n--\n\nKuan-Yu Lin is a Staff Scie
 ntist at Purdue University and Research Associate at the Smithsonian Insti
 tution. His research integrates the geochemistry and petrology of lower cr
 ustal and upper mantle lithologies with numerical models to investigate ho
 w magmatic processes drive crustal growth\, mineralization\, and hydrother
 mal activities along mid-ocean ridges. He has also worked extensively on a
 dvancing analytical capabilities to decode the complex chemical signatures
  preserved in geological materials.
LOCATION:Building 320\, Geology Corner\, Room 220
SUMMARY:Earth Planetary Science Seminar - Dr. Kuan-Yu Lin "Record of on-axi
 s gabbro emplacement at the Atlantis Massif oceanic core complex and its t
 ectonic and hydrothermal implications ".
URL;VALUE=URI:https://events.stanford.edu/event/earth-planetary-science-sem
 inar-dr-kuan-yu-lin-record-of-on-axis-gabbro-emplacement-at-the-atlantis-m
 assif-oceanic-core-complex-and-its-tectonic-and-hydrothermal-implications
CATEGORIES:Class/Seminar
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