The Liesegang phenomenon - Crete with Alexandra EarthCache
The Liesegang phenomenon - Crete with Alexandra
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Request: close EarthCache is located (https://coord.info/GC53QCK) - Bruuns HOLIDAY CACHE No. 1 creator Bruun from Denmark (coordinates N 35 ° 30.813 'E 023 ° 54.770'). Feel free to search, boxes and ordinary EarthCache
In the village of Platanias, on the slope of the hill rising to a height of about 80 meters above sea level I placed EarthCache. I would recommend a little walk to a place where we can see the beautiful panorama of the city and Thodorou islands. By the way, on a slope, at the edge of the asphalt road, we see self-organization in nature. The phenomenon of the formation of Liesegang rings is an example of self-organization. Creating here a characteristic rock sediment deposits from the nearby mountains White (Lefka Ori). The rings formed in the alluvial layers of a high calcium content and a high quartz content of Fe2 +.
The process by which Liesegang rings develop is not completely understood. Liesegang rings may form from the chemical segregation of iron oxides and other minerals during weathering. One popular mechanism suggested by geochemists is that Liesegang rings develop when there is a lack of convection (advection) and has to do with the interdiffusion of reacting species such as oxygen and ferrous iron that precipitate in separate discrete bands which become spaced apart in a geometric pattern. A process of precipitation known as the Ostwald-Liesegang supersaturation-nucleation-depletion cycle is known by the geologic community as a probable mechanism for Liesegang ring formation in sedimentary rocks. As Ostwald suggests, and in simpler terms - there is a localized formation of crystal seeds that occurs when the right level of supersaturation is reached, and once the crystal seeds form, the growth of the crystals is believed to lower the supersaturation level of fluids in pore spaces surrounding the crystals, thus mineralization that occurs after the initial crystal growth in the surrounding areas develops in bands or rings. One classic example based on the Ostwald-Liesegang hypothesis is observed in water and rock interactions where iron hydroxide precipitates in sandstone through pore spac Liesegang ring patterns are considered to be secondary sedimentary structures, though they are often found in a number of permeable igneous and metamorphic rocks that have been chemically weathered. Chemical weathering of rocks that leads to the formation of Liesegang rings typically involves the diffusion of oxygen in subterranean water into pore space containing soluble ferrous iron. Liesegang rings usually cut-across layers of stratification and occur in many types of rock, some of which more commonly include sandstone. Liesegang rings are often referred to as great examples of geochemical self-organization, meaning that their distribution in the rock does not seem to be directly related to features that were established prior to Liesegang ring formation.
PL
Proces powstawania pierścieni
Polega on na cyklicznym wytrącaniu nierozpuszczalnego produktu z przesyconego roztworu dyfundującego przez ośrodek skalny. W naszym przypadku roztwór zawierający rozpuszczone jony żelaza (Fe2+) dyfundował przez piaskowce. Podczas dyfuzji utleniały się i wytrącały z roztworu nierozpuszczalne tlenki żelaza - efektem tego są ciemne prążki. Ponieważ zużywał się przy tym okoliczny tlen, dyfuzja ruszała dalej - powstawał jasny prążek.- aż do napotkania kolejnego obszaru utleniającego, i tak dalej. Najczęściej występują w skałach osadowych, lecz mogą pojawiać się również w skałach wulkanicznych i metamorficznych.
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Answers send via my profile and then log your find. If anything is wrong I will contact you.
*** Tasks ***
1 / rust-colored rings have a characteristic color. What do you think can cause Such coloration?
2 / On the left side of the slope next to the ground, we see a closed ring. Can you give approximately the circumference?
*N
1 / rust-farget ringene har en karakteristisk farge. Hva tror du kan forårsake Slike farge?
2 / På venstre side av skråningen ved siden av bakken, ser vi en lukket ring. Kan du gi omtrent omkretsen?
*PL
1/ Pierścienie mają charakterystyczną rdzawą barwę. Jak myślisz, co może powodować takie zabarwienie?
2/ Z lewej strony skarpy tuż przy gruncie widzimy zamknięty pierścień. Czy możesz podać w przybliżeniu jego obwód?
*NL
1 / roest gekleurde ringen hebben een karakteristieke kleur. Wat denk je dat kunt Dergelijke verkleuring veroorzaken?
2 / Aan de linkerkant van de helling naast de grond, zien we in een gesloten ring. Kunt u de omtrek geven Ongeveer?
Were used: Wikipedia, the Internet, googletranslator
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