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Alarcon Rise/Pescadero intersection
Name Alias(es):
MGDS_FeatureID lowest in hierarchy:
Vent Sites:
Activity:
Latitude:
23.6423
Longitude:
-108.3948
Location on map:
Ocean:
Region:
National Jurisdiction:
Maximum or Single Reported Depth (mbsl):
2384
Tectonic setting:
Full Spreading Rate (mm/a):
47.5
Host Rock:
NotProvided
Deposit Type:
NotProvided
Notes on Vent Field Description:
2015 ROV Doc Ricketts Dive 747 in Pescadero Transform near northern end of Alarcon Rise; spreading rate is given here for the Alarcon Rise step in Bird (2003) plate model; MBARI website, accessed 12 May 2015, http://www.mbari.org/expeditions/GOC15/Leg5/April11.html: "Along each of the transform faults we have discovered communities of chemosynthetic animals supported by low-temperature venting through lava flows. These vents may be hydrothermal in origin related to heat extraction from underground hot rock, or cold seeps related to fluid expulsion from the sediment underlying the surface lava flows."; note that this database entry may ultimately be determined to be a hydrothermal seep or cold seep
Notes Relevant to Biology:
MBARI website, accessed 12 May 2015, http://www.mbari.org/expeditions/GOC15/Leg5/April11.html: "At these seeps, we observed non-symbiotic, flocculent bacterial mats along with dense populations of large, cold-seep tubeworms (Lamellibrachia sp.), vesicomyid clams, and serpulid worms."
Year and How Discovered (if active, visual confirmation is listed first):
2015 ROV Doc Ricketts did not confirm activity
Discovery References (text):
MBARI website, accessed 11 May 2015, http://www.mbari.org/expeditions/GOC15/Leg5/April11.html
Other References (text):
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