Wednesday, February 17, 2016

Re: [Geology2] Zhangye Danxia National Geological Park "China's Rainbow Mountains"



To answer your question as to the color, yes and no. Most images have had a trip to Photoshop, but tourists who have seen them swear that they are like colorful layer cakes or "earth candy." Then there is one stodgy geologist that says, no, they don't look anything like that, but I think he was just trying his best to be an educated putz.

However, I am the finder of geo papers and I've found a few for you to read:

http://webcache.googleusercontent.com/search?q=cache:Iuj-ivaXaEEJ:benthamopen.com/contents/pdf/TOGEOJ/TOGEOJ-7-54.pdf+&cd=8&hl=en&ct=clnk&gl=us

http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.486.6141&rep=rep1&type=pdf

I think you'll find the answers you seek within one or both of these documents.

In the meantime, you can take a look at one of the more realistic images on my Geology is Art blog: http://beautifulgeology.blogspot.com/2016/02/zhangye-danxia-national-geological-park.html

Hope this helps to sate your curiosity... I know what a pain that can be.

Lin





On Wed, Feb 17, 2016 at 11:09 AM, coyote coyote2@ymail.com [geology2] <geology2@yahoogroups.com> wrote:
 

I see that the article is from a geology site, but I wonder if  the brightest colors are really that bright, or are saturated.  Not that I think they need to be anywhere near as dull as in the far more muted shots on that page. 
 
After just a bit of googling I got neither good comparison photos or a satisfying geological explanation.  For the later, I will offer the guess that widespread geothermal processes could have delivered the various coloring minerals, somehow varying the minerals at various times for the layers.  Kinda weird this happening with sedimentary deposition; perhaps during each period the seas were colored too? 
 
In Yellowstone one can see whole areas colored variously by geothermal delivery of different minerals to existing rock (thus without layering).  That these rocks appear to have been colored as they were created is particularly interesting to me.
 
Any help please from someone more informed than I?
 


From: "Lin Kerns linkerns@gmail.com [geology2]" <geology2@yahoogroups.com>
To:
Sent: Tuesday, February 16, 2016 8:16 PM
Subject: [Geology2] Zhangye Danxia National Geological Park "China's Rainbow Mountains"

 

Zhangye Danxia National Geological Park "China's Rainbow Mountains"



The Zhangye Danxia National Geological Park (Chinese: 张掖丹霞国家地质公园), also known as Zhangye Danxia (Landform) Geopark, is located near the city of Zhangye in China's northwestern Gansu province. It covers an area of 510 square kilometres (200 sq mi). Formerly a provincial park and scenic area, it became a national geopark in November 2011. Known for its colorful rock formations, it has been voted by Chinese media outlets as one of the most beautiful landforms in China.

China Danxia is the name given in China to landscapes developed on continental red terrigenous sedimentary beds influenced by endogenous forces (including uplift) and exogenous forces (including weathering and erosion). The inscribed site comprises six areas found in the sub-tropical zone of south-west China. They are characterized by spectacular red cliffs and a range of erosional landforms, including dramatic natural pillars, towers, ravines, valleys and waterfalls. These rugged landscapes have helped to conserve sub-tropical broad-leaved evergreen forests, and host many species of flora and fauna, about 400 of which are considered rare or threatened.

Location

The park is located in the northern foothills of the Qilian Mountains, in the counties of Linze and Sunan, which are under the administration of the prefecture-level city of Zhangye, Gansu province. The main areas of Danxia landform are in Kangle and Baiyin townships.

The core area of the park, Linze Danxia Scenic Area, is located 30 kilometres (19 mi) west of downtown Zhangye and 20 kilometres (12 mi) south of the seat of Linze County. It is the most developed and most visited part of the park. A second scenic area, Binggou (冰沟), located on the north bank of Liyuan River (梨园河), was officially inaugurated on 3 August 2014. Binggou covers an area of 300 square kilometres (120 sq mi), and its elevation ranges from 1,500 to 2,500 meters above sea level. A third area, Sunan Danxia Scenic Area, is located in Ganjun, south of Linze.

Landscape

Zhangye Danxia is known for the unusual colours of the rocks, which are smooth, sharp and several hundred meters tall. They are the result of deposits of sandstone and other minerals that occurred over 24 million years. The result, similar to a layer cake, is connected to the action of the same tectonic plates responsible for creating parts of the Himalayan mountains. Wind, rain, and time then sculpted extraordinary shapes, including towers, pillars, and ravines, with varying colours, patterns, and sizes.

How Was It Formed?

Zhangye 's Danxia was formed by the erosion of red sandstone, forming isolated peaks and steep stratified outcrops. Its special geological structure, combined with long-term desert conditions , freeze-thaw peeling, and wind and water erosion gave rise to its present appearance.

Geologists believe that Danxia topography is formed by folding of layered oceanic crust. Exposed slanting rock layers have different colors, textures, shapes, sizes, and patterns. The combination of differences in density and erosion create towering peaks, cave holes, and stone halls.

Photos









Video available here:

http://www.geologypage.com/2016/02/zhangye-danxia-national-geological-park.html

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Posted by: Lin Kerns <linkerns@gmail.com>



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