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It's not all that it's cracked up to be -DP/EC64 EarthCache

Hidden : 11/28/2012
Difficulty:
1.5 out of 5
Terrain:
2 out of 5

Size: Size:   not chosen (not chosen)

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Geocache Description:


From the guidelines: "People do not need to wait for permission to log your EarthCache. Requiring someone to wait is not supported by the EarthCache guidelines. People should send their logging task answers to you, then log your EarthCache. When you review their logging task answers, if there is a problem, you should contact them to resolve it. If there is no problem, then their log simply stands."


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Introduction - In many instances rocks exhibit features that we take for granted and pay little attention to. Weathering phenomena are one such example. Weathering is speeded up along cracks and joints and in many cases this is accompanied by fluid circulation along these cracks. This circulation affects the original chemistry of the rocks and often forms alteration haloes adjacent these cracks.

What is weathering?– Simply put, it is the decomposition of rocks, soils and their minerals through direct contact with the Earth's atmosphere. It can be the result of chemical weathering or mechanical weathering.

Your lesson in this EarthCache– Observe a weathering surface with evidence of fluid circulation and identify what the original rock was and how it has been affected by fluid circulation and chemical weathering.

Geological setting of this EarthCache - The country rock types are reef limestones of Lower Cretaceous (Hauterivian – Barremian; 136.4 to 125 M.a.) age striking NE and dipping gently to the SE cut occasionally by igneous dykes.

Difficulty of the EC lesson – Very easy to easy!

Logging requirements - In order to log this EC you need to get to GZ and answer a few simple questions. There is no need to step down but you can if you want to get a closer look. If you think you have the right answers, log the cache but ALSO send me the answers via my profile with the following information1 - Identification of the cache; 2- Answers and 3- please click: I want to send my e-mail along with this. c
Logs without answers = log deletion!

Question 1 – What are the two main orientations of the cracks?
Question 2 – Can you work out which one was first?
Question 3 - What is the original colour of the limestone? (Yellow or grey?)
Question 4 – What colour is the alteration halo adjacent the cracks? (Yellow or grey?)
Question 5 – Are the cracks cm or mm size?

(NO SPOILER PHOTOS IN LOGS!)


Introdução - Muitas rochas apresentam características aos quais não lhe damos a devida atenção. Fenómenos de meteorização são um exemplo. A meteorização das rochas é acelerada ao longo de juntas e fissuras e em muitos casos isto é acompanhado por circulação de fluido ao longo dessas fracturas. Esta circulação de fluidos afecta a química original das rochas e muitas vezes formam-se auréolas de alteração adjacentes dessas fracturas.
O que é a meteorização? Explicado de uma forma simples, é a decomposição de rochas, solos e seus minerais através do contacto directo com a atmosfera. Meteorização pode ser química ou mecânica.

A tua lição nesta EarthCache – Observar a superfície meteorização com evidência de circulação de fluidos e identificar qual a rocha original e como foi afectada pela circulação de fluidos e meteorização química.

Enquadramento geológico desta EarthCache– Rochas encaixantes de calcário do Cretácico inferior (Hauteriviano – Barremiano; 136.4 to 125 M.a.) orientadas para NE e inclinadas para SE cortadas localmente por diques básicos.

Dificuldade desta lição– Muito fácil a fácil

Para poderes logar esta EC só tens de responder a umas simples perguntas. Se pensas que passaste no teste faz o log de found mas envia-me também as respostas com a 1- a identificação da cache; 2- respostas e  selecciona “I want to send my e-mail along with this message.” Se não te responder é porque passaste no teste e estás de parabéns. Caso contrário irás receber uma resposta. Logs sem respostas enviadas serão eliminados.

Pergunta 1 – Quais são as duas principais orientações das fracturas?
Pergunta 2 – Consegues perceber quais as fracturas que se implantaram primeiro? (Quero saber a sua orientação)
Pergunta 3 - Qual é a cor original do calcário?
Pergunta 4 – Qual a cor da auréola de alteração ao lado das fracturas? (Amarelo ou cinza?)
Pergunta 5 – As fracturas são milimétricas ou centimétricas?

(NÃO METAM FOTOS SPOILER NOS LOGS!)


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aThe most exciting way to learn about the Earth and its processes is to get into the outdoors and experience it first-hand. Visiting an Earthcache is a great outdoor activity the whole family can enjoy. An Earthcache is a special place that people can visit to learn about a unique geoscience feature or aspect of our Earth. Earthcaches include a set of educational notes and the details about where to find the location (latitude and longitude). Visitors to Earthcaches can see how our planet has been shaped by geological processes, how we manage the resources and how scientists gather evidence to learn about the Earth. To find out more click HERE.

Additional Hints (No hints available.)