Iguazu - a photo on Flickriver

Iguazu

This shot, in addition to of course being picturesque as all get-out, shows off some of the geology of the site. The falls are cut into the flood basalt forming the Paraná large igneous province. The eruption of such a flood basalt is a cataclysmic event often associated with global mass extinctions. This one happened ~130 million years ago and may have helped drive the breakup of West Gondwana into South America and Africa. (Anomalously, though, despite its massive scale, it was not accompanied by much in the way of extinctions -- perhaps just the end of an age, the Valanginian.)

The more erosion-resistant vesicular basalt at the top of the third main trapp forms the caprock of the top layer. We are standing on the caprock of vesicular basalt at the top of the second main trapp, which forms the next step in the staircase.

For everything you always wanted to know about the geology of Iguazu but were afraid to ask, see the deep dive at written-in-stone-seen-through-my-lens.blogspot.com/2017/1....

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Taken in: Argentina / Misiones / Iguazu Falls (show map)

Taken on: December 21, 2023

Tags:

waterfall

falls

basalt

large igneous province

Paraná

flood basalt

trap

traps

trapp

trapps

Iguazu

Argentina « less

Sets appears in: • Iguazu 2023 • Geology

Groups appears in: • Earth Science Teaching Resource

Camera: Fujifilm X-T4, f/5.6, 1/950 sec, 18mm (=27mm), ISO 160 (more info) (hide info)

Camera:	Fujifilm X-T4
Aperture:	f/5.6
Exposure Time:	0.001 sec (1/950)
Focal Length:	18mm (35mm equivalent: 27mm)
ISO:	160
Exposure Bias:	0 EV
Flash:	No Flash
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	darktable 4.0.0
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Stats: 136 views / 3 comments

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