The Origin of Chondrules

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UCLA Meteorite Gallery Lecture Series: December 2020
Title: The Origin of Chondrules
Lecturer: Dr. Alan Rubin, University of California, Los Angeles
Chondrules are submillimeter-size igneous spherules that formed after the crystallization of free-floating silicate-rich droplets in the solar nebula. Their immediate precursors were highly porous millimeter-to-centimeter-size dust aggregates that experienced flash melted, possibly by nebular lightning. Many chondrules appear to have been heated and partly melted more than once; this is indicated by the occurrence in many chondrules of relict grains, overgrowths on phenocrysts, secondary spherical shells (in enveloping compound chondrules), igneous rims, and microchondrule-bearing rims. In addition, P x-ray maps of FeO-rich chondrules reveal complicated thermal and mechanical histories that are otherwise hidden.
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1 окт 2024

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Комментарии : 15

@mikedavis2566 3 года назад

I got Indian axe full grove that made out of a meteor. Do you want to test it?

@vanderlay657 2 месяца назад

The atheist statement was very poor form! I find scientists that believe in a god bizarre, especially when they work with evidence and facts and there is NO evidence for any of the thousands of gods people have made up in their heads.

@LumieSoucek-r2t 2 месяца назад

Hi Mr Allan. 3 years ago I sent you some pictures of my rocks. I was new, naive and innocent to this game. I didn't know the elements to look for. I didn't know scientific terminology of meteorite. I got excited with what I saw under the lens of my cheap tiny magnifier. So I called and called scientists, geologists including you. All those calls was all dead end. I think discrimination and racism played a big role to all the denials. The rocks is full of chondrules, chondrites, widmanstatten pattern, mixed metals, fusion crust, pyroxene, long needles nickels and a lot more. Why did you said that the rocks are basically trash? Since I am now so determined that the rocks are meteorite. Looking for geologists to tell me it's meteorite or meteor wrong is a thing in the past with regards to this rocks. What I'm looking for now is classification and extensive testing. I will find that lab wherever on earth.

@patbrown2227 2 месяца назад

A very information rich presentation. Strong evidence for the multiple heating that lightning can cause. Great presentation.

@lawrenceatkins2160 9 месяцев назад

Excellent presentation, Alan! Thanks for the breakdown.

@antoniolloren8281 9 месяцев назад

I have a Meteorite minerals a magnetic minerals a Martian Meteorite. Do you want to see my meteorite Video and to test it. Watching from Davao city Philippines.

@3amarregagda747 2 года назад

I have a group of chondrite, lunar and Martian meteorites in Algeria

@عباسدهقانی-ط1ل 11 месяцев назад

سلام میشه با واتساپ ارتباط برقرار کنم با شما؟؟

@janinemenezes_ 2 года назад

Achei uma Rocha muito pesada tem som de metal e o imã fica sambando em cima da Rocha . Quero mandar uma foto p vcs como faço p vcs ver se é mesmo um meteoro

@yaamin_Digimusic Год назад

so cool thank you 🎸🤟

@janinemenezes_ 2 года назад

Bom dia

@HoboMinerals Год назад

Excellent video! Thank you for sharing this! I’ve watched it several times, and learn every time I do! I’d like to see a video for each type category! What exactly makes an angrite different from lodranite etc… I’d like to go back to school, but it’s so expensive, and I appreciate the free education! Please keep making these videos!

@leannaerickson9745 Год назад

I'm in your slow learner group. I need to have this replayed in slow motion a couple of times. Nonetheless, the subject matter is fascinating, and I enjoyed the lecture and the way you presented it. Thank you.🤩🌟🌠✴

@vanderlay657 Год назад

What is with the atheist comment? Poor form.