[Folda] Fwd: [Jhi] Friday seminar - 14.10., 12.30 - Prof. Robert A. Zierenberg "Doc Ricketts Discovers New Deep Sea Hydrothermal Vents in the Sea of Cortez"

[Deirdre Clark]

Today's Friday seminar at 12:30 will be given by Prof. Robert A. Zierenberg
on *“Doc Ricketts* Discovers New Deep Sea Hydrothermal Vents in the Sea of
Cortez”.

See abstract below for more information.

---------- Forwarded message ----------
From: Maren Kahl <marenk at hi.is>
Date: Mon, Oct 10, 2016 at 12:12 PM
Subject: [Jhi] Friday seminar - 14.10., 12.30 - Prof. Robert A. Zierenberg
"Doc Ricketts Discovers New Deep Sea Hydrothermal Vents in the Sea of
Cortez"
To: jhi at hi.is


Dear all,

our Friday seminar series continues this week (14.10) at 12:30 in the
seminar room on the 3rd floor with a presentation given by:

Robert A. Zierenberg, Professor of Geology, University of California -
Davis.  Visiting Fulbright scholar at University of Iceland, Fall 2016

*“Doc Ricketts* Discovers New Deep Sea Hydrothermal Vents in the Sea of
Cortez”

Alarcon Rise, the northern-most spreading segment of the East Pacific Rise,
was mapped at high resolution by Monterey Bay Aquarium Research Institute.
More than 100 potential hydrothermal chimneys were identified based on the
detailed bathymetry.  Dives using the Remotely Operated Vehicle *Doc
Ricketts* confirmed the presence of more than 70 sulfide chimneys, and
discovered and sampled four active, high-temperature hydrothermal vent
fields on the most magmatically robust section of the spreading center.  A
suite of magmatically differentiated rocks ranging from basalt to high
silica rhyolite occurs near the center of the spreading segment, but is
surprising devoid of evidence for hydrothermal activity.  Mapping of the
Southern Pescadero Basin, a deep (~3800 m) sediment-filed pull-apart basin
associated with the Pescadero Transform fault showed the presence of active
hydrothermal mounds up to 100 m across rising up to 25 m above the
sediment.  Subsequent dives discovered a unique vent field building mounds
of hydrothermal carbonate with only minor associated Cu-Pb-Zn sulfide
mineralization.  The vent field appears to have been active for a long time
and is heavily colonized by the uncommon tube worm *Oasisia*.  Talus from
the base of a nearby large, but unexplored, topographic mound suggests the
presence of a new type of barite-hosted, base metal depleted Ag-Au-Sb
mineralization.





Best,



Maren & Maria





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-- 
Deirdre Clark, PhD Research Fellow
University of Iceland | Háskóli Íslands
Institute of Earth Sciences
Sturlugata 7, Askja, Room 265
101 Reykjavík, Iceland

+354 525 5414 (Office)
+354 690 5745 (Mobile)
dec2 at hi.is
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