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GEO-TECTONICS  January 2006

GEO-TECTONICS January 2006

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Subject:

Penrose Conference on Arc Crustal Genesis and Evolution

From:

Bradley Hacker <[log in to unmask]>

Reply-To:

Tectonics & structural geology discussion list <[log in to unmask]>

Date:

Mon, 23 Jan 2006 22:50:10 +0000

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (128 lines) , Arc Penrose Conference.doc (128 lines)

Penrose Conference on Arc Crustal Genesis and Evolution
Valdez, Alaska, July 9-15

Conveners: Peter Kelemen & Brad Hacker

The Penrose Conference on arc crustal genesis and evolution will be held in 
Valdez, in south-central Alaska, from July 9–15. The Conference will be 
limited to about 80 participants, and participants must apply to attend. 

Presentations will integrate recent results on well-exposed arc crustal 
sections – in the Jurassic Talkeetna arc in south central Alaska, and in 
the Cretaceous Ladakh–Kohistan arc in northern Pakistan and India – with 
important new developments in active-arc geochemistry, petrology and 
geophysics. The Talkeetna and Ladakh–Kohistan arcs provide exposures of 
relatively complete sections from Moho depth (30 to 40 km in both cases), 
to volcanic rocks and volcaniclastic sediments. Both have been the subject 
of large, multi-disciplinary projects over the past decade, and provide 
depth sections and temporal progressions that are not accessible in active 
oceanic arcs. 

Intensive, recent investigations of arc plutonic suites elsewhere 
complement these projects. New data from the US MARGINS Initiative, Sierra 
Nevada Continental Dynamics Projects, Aleutian studies, and similar 
international initiatives provide constraints on crustal thickness and 
volcanic fluxes in active arcs. Advances in the study of melt inclusions 
have dramatically improved understanding of volatiles in primitive arc 
magmas. Studies of ultra-high pressure metamorphic rocks and new 
experimental methods have yielded insights into mantle wedge melt 
generation, and subduction zone dehydration and anatexis. This conference 
will provide an opportunity to synthesize these results, with a focus on 
using direct observations of arc crustal sections, from the uppermost 
mantle to the volcanics, to constrain arc processes and their role in the 
genesis and evolution of continental crust. 

The enthusiastic response of keynote speakers – only one out of twenty-four 
declined the request for letters of commitment – indicates to us that the 
time is right for this conference, and that it will attract an excellent 
group of well informed participants with much to discuss.

To complement research presentations, the Conference will include at least 
two field trips, to accessible outcrops of volcanic and the Moho sections 
of the Talkeetna arc. Depending on the level of interest, there may also be 
another (expensive, helicopter supported, multi-day) field trip to the 
Klanelneechina field trip, open to participants with experience in 
backcountry travel in alpine terrain. 

Tentative Conference Schedule

Sun July 9: Bus trip from Anchorage, Sheep Mountain Field trip along the way
Mon July 10: Setting the stage: Alaska tectonics, geochronology, arc 
tectonics
Tue July 11: Crustal bulk composition, conditions & processes of 
crystallization
Wed July 12: Bernard Mtn Field Trip and informal discussions, all day
Thu July 13: Metamorphic petrology, deformation, & arc geophysics
Fri July 14: Crustal dynamics, mantle dynamics, melt production
Sat July 15: Bus trip back to Anchorage
		 Beginning of possible multi-day field trip to 
Klanelneechina klippe

Logistical information

To apply: please contact the conveners by email at [log in to unmask] 
and [log in to unmask] with a letter of intent that includes a brief 
statement of interests the relevance of the applicants recent work to the 
themes of the Conference, the subject of a proposed presentation, and 
contact information. Interested graduate students are strongly encouraged 
to apply; partial support is available for student attendees from GSA. Once 
you have been selected to participate, we will forward your contact 
information to the GSA Penrose organization, and they will send you 
detailed registration information. 

Application deadline is Friday, March 31, 2006

Travel and costs: Buses will meet participants at the Anchorage 
International Airport, and one or two downtown locations to be announced, 
on the morning of July 9, and buses will return participants to these 
locations on the afternoon or early evening of July 15. We will stay in the 
Best Western Valdez Harbor Inn, and the conference, together with lunch and 
dinner, will take place at the Civic Center in Valdez, one block from the 
Inn. The cost will be $1125 per person, from Anchorage, round trip, based 
on double occupancy. Those requesting a single room (limited availability) 
will pay an additional $350 for the week.

The relatively easy air access to Anchorage, and somewhat modest hotel, 
make this a normal cost for Penrose Conference participants despite the 
rather remote location. We are still in the process of applying for and 
allocating additional funding to help defray travel costs for some 
participants, so the cost could go down. If cost is a major problem, and 
makes the difference between attending and not being able to come, please 
let the Conference conveners know via email.

Some participants may wish to make their own plans for travel back from 
Valdez to Anchorage, for example via the Alaska State Ferry system from 
Valdez to Whittier,
(ferry info at http://www.dot.state.ak.us/amhs/schedres/scheds/S06.htm)
and then by bus or train from Whittier through the new tunnel to Anchorage
(info at http://www.themagicbus.com/ and http://www.alaskarailroad.com/)
HOWEVER, if you decide to choose this option (1) you may wish to make 
bookings on the train or bus soon, because the "public" transportation can 
fill up with cruise ship groups, and (2) PLEASE let the conference 
organizes know as soon as possible via email so that we can potentially 
save some money on the bus from Valdez to Anchorage.

Field trips: Weather permitting, there will be a field trip to look at 
outcrops of the volcanic section of the Jurassic Talkeetna arc, accessible 
via a short bushwack from the highway about halfway from Anchorage to 
Valdez on July 9. There will also be an all day, mid-week field trip to 
look at some Moho depth exposures of gabbronorite, mafic garnet granulite, 
pyroxenite and residual harzburgite in the Talkeetna arc section, starting 
at a trailhead about two hours drive from Valdez on July 12 (with a 
possible rain date for one or the other field trip on July 15). Both field 
trips will involve some moderate, off-trail hiking (brush on July 9, talus 
on July 12) and are, of course, optional.

Depending on the level of interest, we may also offer an optional 
(expensive, helicopter supported, overnight) field trip to the lower 
crustal rocks of the Klanelneechina klippe for participants experienced in 
alpine back-country travel. Lithologies record equilibration at about 700°C 
and 7 kb, and include garnet two-pyroxene quartz diorites (AKA granulites) 
and garnet tonalite veins. Garnet is igneous in both of these lithologies, 
as revealed by heavy rare earth element enrichment. There are also variably 
retrogressed granulite-facies mylonites in the klippe. Let the Conference 
conveners know if you are interested.



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