Southern California Geology | Mafic Enclaves
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- Опубліковано 15 жов 2024
- Featuring a swarm of fine-grained, mafic enlaves, some ellipsoidal, appearing to swim through the surrounding biotite-hornblende monzogranite pluton emplaced some 103 million years ago within the Western Transition Zone of the Peninsular Ranges here in Southern California.
Location: South Shore of Lake Perris, CA. 33.83804° N, 117.17293° W
Todd - excellent work. Drone shots pushing in to the outcrops especially effective. I don't think I've seen drone used like that. Congrats.
Appreciate the feedback Professor! I thought that was an effective video as well to showcase the overall scale and then zoom in for the details. Hope all is well.
I love your enthusiasm for geology! Geology is one of the most fascinating subjects because the planet is so dynamic. It's constantly changing in some way!!
Man…I recently stumbled onto this cache of geology videos. Wow! So good! Nice mix of the available tech (drone shots!) and old school narrative creation! Lots of learning goin on here! Thanks!!
Todd, I love your videos! There's nothing I love more than someone that is passionate about a subject and excels in sharing their knowledge about it. California is rich in geology and I can't thank you enough for these informative videos. I taught 4th and 5th grade science and I loved geology and it was so thrilling to see students actually get excited about the rocks and mountains all around them here in southern California. Keep it up!
The flow pattern really gives the sense of current and activity in the chamber. That is a first for me. I know it has to happen but I have never seen it so plainly that you can't miss it. Thanks Todd.
The magmatic motion is so evident here!
Great seeing you again! Sure have missed you!
Good to be missed! Thank you kindly.
I visited this site in 1978 for a Spring Field geology class while an undergrad at UC Riverside with Dr. Doug Morton, Dr. Peter Sadler and Dr. Lewis Cohen leading the class. Nice having a drone to climb up the rock face…didn’t have those in the ‘70’s. RIP Dr. Doug Morton who did a lot of pioneering work on the Southern California Batholith.
I have a ton of his papers which inspired me to visit this site. He did great work. 👍🏼
He did great work and was a good guy to boot. This field trip I mentioned, the students were taken to a number of locations with the goal of trying to figure out what these inclusions/xenoliths were. This outcrop at Lake Perris was the last stop. Dr. Cohen kept telling us “all will be revealed at our last stop”. This outcrop was a great reveal for sure. Thanks for these great videos you are putting out. I miss the field trips throughout SoCal that we went on with our professors at UCR. Dr’s Paul Robinson, Doug Morton, Lewis Cohen, Peter Sadler, Pete Schiffman, Wilfred Elders and Mike Murphy.
I am glad I found your channel. I drove through the area once in a while and often wondered what made up these rocky outcrops in the Riverside County
I remember climbing that slab ten years ago and wondering about the geologic forces that were in play. Thanks for making a video about this fascinating area!
Thanks for watching! You're a braver man than me!
Thank you for explaining our property spectacular boulder field adjacent to the morro hill plug oceanside. Was fascinated why we had different rock. Thank you.
Thank you always wonder what these hills I lived around were all about.
Geology Rocks shirt. Looks like Mt. Hood. Can't wait to go to some of your sites. Thanks
Finally Bro! Another video. Please keep them coming. Great content.
Haha! I do my best, I'm a busy guy. Thanks for the encouragement.
Very interesting video Todd. Loved your commentary about the mixing of magma and the drone shot up the frozen plume was fascinating. Thanks for including the longitude and latitude for those of us that would like to take a personal look. I'm planning a visit.
Some chunks look like cookie dough, some pancakes.
Another tasty episode, G.S. 👍
Haha! Even better! More food analogies in geology! Thanks.
Lots of mafic enclaves in sandiego too. posted on nz a while ago. Looks like fish. Cool. Nice work.
Another great video Todd! Thanks!
Thanks Dan!
love all your videos and good taste in music
Thanks Todd, as always love the info, your amazing passion and the unique reggae. Just got me a chunk of Volcanic plug from the top of Bishop peak in SLO. Great hike and killer story for a future episode.
Thanks for watching and for the tip! 👍🏼
would love if some geologists would do a video on the cool quarry near auburn california.thanks for sharing with us
Should do a survey of the tenaja falls :)
Love this stuff...wish there were more.
Thanks! I try, but this is just a hobby of mine. I'm a busy man with a job and a family to raise, but I do my best! I appreciate the encouragement.
Very interesting. Thank you
Great looking rocks with an interesting pass. It fun seeing rocks other than ancient sea floor as much of NY PA and OH are made up of. Really enjoy your videos!! Thanks
Thanks for watching and for the kind words.
great pattern differentiation - always wondered how such hodge-podge could develop and intermix - 10*
Thanks John!
You should really make a trip out to Death Valley to such areas as Mosaic Canyon for a treasure trove of rock compositions.
love your channel! I'm learning so much. Wondering if you have done Whitewater Canyon near Palm Springs. I'm filming, painting and rockhounding there currently and I have so many questions about what has gone on in there..
Another example of this is seen on the trail to Mt. Gower in Ramona, CA.
Excellent, G.S.! Those outcrops are amazing. I do have a question: Can we geologists really tell whether the foliation is due to flow or due to pressure? I would think both patterns would look the same, and that they are formed under the same conditions. Anyway, I just love these, and I am glad you are still doing them.
Thanks Lorraine! That's an excellent question. I'm guessing they're not mutually exclusive components of a magma chamber; when you have magmatic flow it must create pressure in other areas of said chamber. However, at this location there is definitely evidence of flow patterns (like at the big wall) where the enclaves are blobby or only slightly ellipsoidal, but obviously arranged in a pattern. Contrast that with the mafic pancakes! Must be magmatic flow and pressure to create those! I'm just spit-balling here, but again, intriguing question.
What is the book with the maps? I noticed the mylonite zone in the Santa Rosa Mtns area. I live in Anza. The mylonite zone is pretty close to me. I've seen the mylonites along Hwy 74, but I've never been sure about the extent of it.
Has the huge rock with the park bench under the tree always been exposed to the surface? Underwater?
Or
How long has it been like this?
It makes you wonder how that section of California looked like when it was a subduction zone.
Wow! I haven't seen xenoliths like those before.
Can you provide an exact location for these rocks, or are they all around Lake Perris?
Also, what's your source for the maps which you show at the beginning of the video?
I'm writing from the Oat Hills north of Escondido and East of Valley Center atop monzogranite of Merriam Mountain. Also known as Hidden Meadows.
We need more good videos like this about Southern California geology. I'm embarrassed to say that I know more about Washington State geology than the area where I live.
Thanks John. The map is within a 2014 paper entitled "Framework and petrogenesis of the northern Peninsular Ranges batholith, southern California" by Morton, et al. Yep, Escondido is within the same Peninsular Range; that monzogranite also is a ancient, frozen Cretaceous magma plume.
Hi John. The precise location is in the description text under the title. Longitude and Latitude.
Put some maphic syrup on your pancake enslaves
Reminds me of Chocolate Chip Cookies 🍪
❤❤
Why call them "enclaves" instead of "xenoliths".