190328Akaroa8546ftmPan

GeoJuice
recent  |  interesting  |  random  |  favorites  |  contacts  |  sets  |  tags:  
190328Akaroa8546ftmPan
190328Akaroa8546ftmPan

Banks Peninsula forms the most prominent volcanic feature of the South Island. Geologically, the peninsula comprises the eroded remnants of two large composite shield volcanoes (Lyttelton formed first, then Akaroa), and the smaller Mt Herbert Volcanic Group.These formed due to intraplate volcanism between approximately eleven and eight million years ago (Miocene) on a continental crust. The peninsula formed as offshore islands, with the volcanoes reaching to about 1,500 m above sea level. Two dominant craters formed Lyttelton and Akaroa Harbours.

After (prior) a long period of quiescence, activity recommenced from two centres, and two great mountains, which may be called the Lyttelton and the Akaroa cones, were constructed by normal volcanic processes, lava flows alternating with layers of fragmentary material, till they exceeded in height and volume the great volcanoes of the North Island. In all probability Lyttelton was slightly the earlier of the two but smaller in size. They show a remarkable similarity to each other in their mode of formation, in the character of the lavas they discharged, and even in unessential aspects of mountain construction and destruction. The actual centre of the Akaroa volcano was situated somewhere near the end of Onawe Peninsula and the cone extended with a seven mile radius on all sides, and reached north and east beyond the rocky wave-cut headlands which now terminate the spurs stretching in that direction, while to the south the flows ran as far as Birdling's Flat, and to the west they reached beyond Pigeon Bay and Kaituna Valley and overlapped those coming from Lyttelton. The base of this cone must have been twenty miles in diameter, and its height judging from the average angle of the lava streams must have exceeded ten thousand feet.

© All Rights Reserved
Taken on: March 28, 2019
Tags: Everybody's photos tagged with Akaroa Akaroa Everybody's photos tagged with New Zealand New Zealand Everybody's photos tagged with Hilltop Hilltop more » Everybody's photos tagged with geography geography Everybody's photos tagged with geojuice geojuice Everybody's photos tagged with volcano volcano Everybody's photos tagged with eroded crater eroded crater « less
Sets appears in:   • New Zealand: Akaroa   
Camera: Canon EOS 5DS, f/10.0, 1/160 sec, 200mm, ISO 400 (more info) (hide info)
Camera: Canon EOS 5DS
Lens: EF70-200mm f/4L USM
Aperture: f/10.0
Exposure Time: 0.006 sec (1/160)
Focal Length: 200mm
ISO: 400
Exposure Bias: 0 EV
Flash: Off, Did not fire
Exposure Program: Aperture-priority AE
Exposure Mode: Auto bracket
Metering Mode: Multi-segment
White Balance: Auto
Color Space: sRGB
Software: Adobe Photoshop CC 2018 (Macintosh)
Show full info
Stats: 182 views