Phoenix Astronomical Society

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"The Arizona Shattering Impact" Presentation by Mike Marron 7pm
Calendar: PAS Public Event Calendar
Event Posted By: Terri Finch  
07-09-2020 07:00 PM to 10:00 PM
Mike Marron's presentation via Zoom on July 9th 7:00 PM will be on "The Arizona Shattering Impact" a large 11.6 million year old crater complex in the center of our state.

Exploring Arizona, collecting impact mineralizations, and studying maps have given new details about the event that Mike discovered just two years ago that rearranged much of Arizona's geology. While erosion has damaged and slightly obscured the vast impact structure much of the crater walls still rise thousands of feet so this is not a worn out, nearly invisible ancient crater. To explore just the crater complex in a day and follow the path of the iron through the landscape would require a plane or helicopter. Greater than vehicle sized fragments of the impact tore through Cave Creek rock leaving miniature versions of how the large crater was carved. Even though the asteroids were about the same size, the Arizona impact crater complex is slightly bigger than the circular Manson impact because our impact had such a low impact angle that it made a giant oval crater. Penetrating about a mile deep the impact blasted away Arizona's previous geology into a thick breccia ejecta blanket that now covers southern Arizona and northern Mexico while leaving exposed in central and northern Arizona the path the asteroid carved into the rock. Most of Arizona's canyons are the crustal extension cracks from the almost horizontal impact which is now called basin and range geology. For the right people Mike will give local tours and teach how to recognize impact material in the other parts of the state by comparisons to his collection of meteorites, shattercones, and other impactites from craters around the world. This Arizona impact is not officially recognized but it has everything you want in a large crater, abundances of shattercones, breccias, impact melt suevites, shocked quartz, towering crater walls, and lots of iron in the right places.

Connection details at this calendar link will be provided a few days before the talk.

This event is open to the public.

Signin will be about 10 minute prior to the start of the presentation which begins at 7pm.

The end time above is arbitrary. This talk will most likely be about 1.5 - 2 hours in length, including Q&A.

Everyone is welcome to pop in and enjoy the presentation. If you must leave before Mike finishes, feel free to go without disturbing the presentation.

Please also MUTE your device so no noises come from your computer to interupt the viewing pleasure of the other attendees to this meeting. Your cooperation is appreciated. Keep your device muted while Mike is doing the lecture, and then when he opens it up for Q & A, you may unmute your device if you have a question for Mike.

More details to come...

This meeting will happen through Google Meet.
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