SDAG Monthly Meeting
Wednesday - May 17
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Location:
Casa Machado
3750 John J Montgomery Dr.
San Diego, 92123
Directions:
South side of Montgomery Field (Airport).
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6:00pm -
Social hour
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SDAG Monthly Meeting
6:00pm - Happy Hour
6:30pm - Dinner
7:20pm - Announcements
7:30pm - 8:30pm Presentation
8:30pm - 8:45pm Questions
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6:45pm
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Menu: Mexican buffet
if pre-registered by the deadline, $5 extra if you did not make a reservation.
Click the SDAG member checkbox on the reservation form if you are a member.
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Cost: $50.00 for non-members, $45.00 for members, $30.00 for students
Reservations:
Make your reservation online by clicking the button below
no later than 3pm, Tuesday, May 16
RESERVATIONS CANNOT BE ACCEPTED AFTER Tuesday at 3:00pm
WALK- INS are still welcome but it might not be possible to add you to the food count.
CANCELLATIONS: If you would like to cancel, pls do so by TUESDAY 5/16 AT 3 PM. Please keep in mind that
we still need to pay for confirmed no shows.Fees payable at the meeting or pre-pay with PayPal.
There also will be a phone credit card reader at the meeting.
IF YOU DO NOT MAKE A RESERVATION, WE CANNOT GUARANTEE YOU A MEAL.
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7:45pm - Announcements
8:00pm - Program
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" Fire and Ice in the North Atlantic: A Geologic Tour of Iceland "
Speaker: Don Barrie, Geology Professor, San Diego Mesa College Board Member
Anza-Borrego Desert Natural History Association (ABDNHA)
Iceland is a large oceanic island developed along the North American-Eurasian plate boundary atop a melting anomaly
interpreted to be a mantle plume. Situated between the Reykjanes Ridge to the south and the Kolbeinsey Ridge to the
north, the origin and evolution of Iceland since early Miocene time have largely been controlled by the localization
of subaerial ridge segments atop the Iceland plume, followed by ridge migrations and jumps. Plate divergence occurs
along the North, East, and West Volcanic Zones; oblique divergence occurs along the Reykjanes Volcanic Belt, the site
of the 2021/2022 Fagradalsfjall eruption. Ridge-ridge transforms include the South Iceland Seismic Zone and the Tjornes
Fracture Zone. Volcanic rock in Iceland is predominantly basalt; however, shallow crustal magma chambers beneath Iceland's
central volcanoes also produce lesser quantities of intermediate and silicic volcanic rock. Deeper magma reservoirs
convey magma directly to the surface via dike and fissure swarms oriented perpendicular to regional spreading azimuths
of 105 and 285 degrees. With its ~ 30 active volcanic systems, Iceland hosts a diverse array of volcanic landforms,
including shield volcanoes, scoria/spatter cones, stratovolcanoes, calderas, cone/crater rows, rootless cones,
hydrovolcanic features, and subglacial volcanic landforms. Subglacial eruptions are frequently followed by jokulhlaups
(glacial outburst floods). Other notable features include waterfalls, ice caps, fjords, valley glaciers, iceberg-strewn
proglacial lakes, geysers, and uplifted sea cliffs. Icecap margins are currently experiencing rapid glacial isostatic
adjustment rates of up to several cm/yr. In summary, Iceland is a geologically wonderous place - a must-see for
field-tripping geoscientists everywhere.
I'm a geology professor in the physical sciences dept. at San Diego Mesa College. I teach
physical geology, historical geology, and Earth science. Before becoming an educator, I
worked as an environmental consultant both domestically and abroad, in California,
Arizona, Hawaii, and Guam.
As an educator, my passion is to make geoscience accessible to general audiences. In
addition, I'm interested in how students learn geoscience, and occasionally conduct
research on this topic.
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Upcoming SDAG meetings - 2023
May 17 - topic: Iceland location: Casa Machado
June
Meetings are usually scheduled for the 3rd Wednesday evening of the month.
Meeting information on this website is normally updated the second week of the month.
If you are a current SDAG member and are not getting e-mail announcements,
make sure the SDAG secretary has your correct e-mail address.
If you have any information, announcements, ads or suggestions for an upcoming newsletter, please submit it to
2023 SDAG Secretary.
Any news regarding upcoming events that may be of interest to the Association or news of your business can be submitted.
The submittal deadline for the next SDAG newsletter is the last Friday of the month.
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