Vertical domes like the famous sugarloaf protrude from the ground and are encompassed by the rich-green rain forest. So of course, being an all-around lover of earth science especially cool rock formations , I wanted to find out more about these domes and their unique relationship with the rain forest to share with you!
These dramatic, steep-sided mountains are the result of some collaborative forces. They are composed mostly of metamorphosed granite. They are intrusion that initially formed underground, and have since been exposed on the surface due to uplift over time, and a combination of fractures, weathering, and climate. In the Cretaceous time period, Africa and South America separated to form the Atlantic Ocean, and this resulted in crustal stresses and fractures in the region.
Fractures create weaknesses in rocks, which are then exploited by tropical chemical weathering i. We went for a hike in Parque Nacional da Tijuca which is part of this Atlantic rain forest that surrounds Rio de Janeiro.
Wandering around you can tell how these steep valley floor due to the sugarloaf-domes ramparts forests are more diverse and have rich supplies of water and soil to support the thick, full tree canopies. The sugarloaf-domes also support summit and shoulder forests, which are isolated and perched on high steep slopes. The environment there is harsh with little soil, nutrients or water but allow host to a vast array of specialized vegetation. Rio de Janerio is definitely worth a visit, and I would love to return one day.
It is a city of rich beauty, but of course also lots of underlying poverty. To be able to learn a bit more about the foundations and formations of such a spectacular place makes it all the more rewarding for me to enjoy!
Thus ends my travel trip in Brazil with my sister. You can check out her final video of Wild Nights in Rio , we missed the carnival but there is always good times to be had in Rio. Thanks for reading! Thanks for sharing, Stephanie. Interesting post as usual, keep exploring, working and keeping us informed. Bless you and please be safe out there. Nice blog, sounds like you had a blast. Hey, thanks for that. I should have checked this, it was the Cretaceous Period and I amateurishly wrote the upper limit.
I fixed it now, though it still is very vague which I apologize for! I live in Rio, also interesting in mountain formations and I can tell you, there are so much more to see! How can I be sure? Hope that helps, cheers! Thanks for enlightened me, staphanae. Because there was a question asked in my exams about how the peaksystem of rio r formed and which type. Hi stepanie : Just wanted to say thanks for this…I always wondered how the peaks of Rio were formed. Very simple to understand, I also light the graphics.
Great job. Hello Stephanie, nice of you to reply, thanks. Bye the way, my cousin is a geologist. His name is Geordie Sinclair, from Windsor Ontario. Fellow geologist here. Interesting piece. Haha, yeah I noticed that and was going to crop it out of the photo, but then I thought it was pretty funny too so I kept it in!
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Indeed the Suga rl oaf is, as correctly described by Darwin, composed mostly of augen-gneiss , a metamorphic rock with single large, often elongated, crystals, resembling eyes in a finer matrix of smaller crystals , therefore the name as auge means eye in German.
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