At this location, you'll find a beautiful white marble pedestal with striking black veins running through it. While the sculpture certainly has art historical significance, the focus of this EarthCache is on the geological processes that led to the formation of the black veins in the marble. This is an opportunity to learn more about the geology of marble while appreciating the connection between art and nature.
What you will learn: This EarthCache explains how the marble used to make this sculpture was formed and how the black veins that run through the white marble were formed. At the same time, you will understand the role of marble as an art material and the connection between geological and artistic processes.
Geological explanation:
1. origin of marble - the formation of white marble
The marble from which the pedestal is made is a metamorphic rock that was originally formed from limestone. This limestone, which consists of the remains of marine organisms such as corals and shells, is altered over millions of years under high pressure and temperature. During metamorphosis, the original limestone crystallizes into marble, with the mineral calcite (calcium carbonate) forming the main components of marble.
In its purest form, marble is white, as it contains no significant impurities. However, during the formation process, various minerals can penetrate the rock and cause changes. These minerals cause the characteristic veins in marble.
2. The formation of the black veins - What causes the dark lines?
The black veins in this marble are the result of geochemical processes that have been at work for millions of years. They are caused by the penetration of hydrothermal solutions containing various minerals into the rock. These solutions circulate through cracks and fissures in the marble and deposit dark minerals. The most common minerals that cause the black veins are graphite, iron oxides (e.g. magnetite or hematite) and bitumen (organic substances).
The exact steps for the formation of the veins are as follows:
- Hydrothermal solutions: Mineral-rich fluids circulate underground, flowing through cracks in the rock. These solutions can consist of water, gases and minerals.
- Deposition of minerals: As the hydrothermal solutions flow through the marble, the minerals are deposited in the cracks in the rock. Graphite and iron oxides in particular, which are dark in color, leave behind striking black veins.
- Hardening and crystallization: Over time, these deposited minerals harden and crystallize further, stabilizing the veins and incorporating them permanently into the marble.
3. The role of marble as an art material
Marble has played a central role in art since ancient times, particularly in the production of sculptures and architecture. The famous white marble of Carrara, used in many sculptures of the Italian Renaissance, is an example of the noble white stone, prized for its fine texture and beauty. This sculpture at this location was made by a german artist within 5 weeks made of a 13 tons marble block (2003). However, the black veins in the marble also contribute to the aesthetic quality of the material. They not only create contrast and visual depth, but also give the material a geological history - a reminder of the processes the marble has undergone over millions of years.
Tasks:
1. If you are standing in front of the spiral, What kind of shape has got the hole on the right site?
2. Describe the color and shape of the veins of the figure near the 5-letter-name of the artist. Are they thin or rather wide, horizontal, vertical, diagonal?
3. Which minerals do you think could have caused the black veins in this marble? Graphite, iron oxides or other minerals?
4. Which geological processes are responsible for the formation of the black veins?
5. Touch the marble within the spin/spiral. Describe the surface (e.g. smooth, rough). What ist the reason for that surface?
6. optional: a picture of yourself or an object on site.
Send me the answers with the messenger. Not in your log! You can log immediately after your answer. You don't have to wait for the log release! Have fun!
在这个位置，您会发现一个美丽的白色大理石基座，上面有引人注目的黑色纹理。虽然这座雕塑确实具有艺术史意义，但这个 EarthCache 的重点是导致大理石中黑色纹理形成的地质过程。这是一个了解更多关于大理石地质学的机会，同时欣赏艺术与自然之间的联系。
您将学到什么：此 EarthCache 解释了用于制作此雕塑的大理石是如何形成的，以及贯穿白色大理石的黑色纹理是如何形成的。同时，您将了解大理石作为艺术材料的作用以及地质过程和艺术过程之间的联系。
地质解释：
1、大理石的起源——汉白玉的形成
制作基座的大理石是一种最初由石灰岩形成的变质岩。这种石灰岩由珊瑚和贝壳等海洋生物的遗骸组成，在高压和高温下经过数百万年的变化。在变质过程中，原始石灰石结晶成大理石，其中矿物方解石（碳酸钙）形成大理石的主要成分。
最纯净的大理石是白色的，因为它不含明显的杂质。然而，在形成过程中，各种矿物质可以穿透岩石并引起变化。这些矿物质形成了大理石的特征纹理。
2. 黑纹的形成 - 黑纹的形成原因是什么？ 这种大理石中的黑色纹理是数百万年来地球化学过程的结果。它们是由含有各种矿物质的热液渗透到岩石中引起的。这些溶液通过大理石的裂缝和裂隙循环并沉积深色矿物质。导致黑脉的最常见矿物质是石墨、氧化铁（例如磁铁矿或赤铁矿）和沥青（有机物质）。
静脉形成的具体步骤如下：
• 热液解决方案：富含矿物质的流体在地下循环，流过岩石的裂缝。这些溶液可以由水、气体和矿物质组成。
• 矿物质沉积：当热液流过大理石时，矿物质沉积在岩石的裂缝中。尤其是深色的石墨和氧化铁，会留下引人注目的黑色纹理。
• 硬化和结晶：随着时间的推移，这些沉积的矿物质会进一步硬化和结晶，从而稳定纹理并将其永久地融入大理石中。
3、大理石作为艺术材料的作用
自古以来，大理石在艺术中发挥着核心作用，特别是在雕塑和建筑的制作中。著名的卡拉拉白色大理石被用于意大利文艺复兴时期的许多雕塑中，是高贵白色石材的一个例子，因其细腻的纹理和美丽而备受推崇。该地点的这座雕塑是由一位德国艺术家在 5 周内用 13 吨大理石块制成的（2003 年）。然而，大理石中的黑色纹理也有助于材料的美观。它们不仅创造对比度和视觉深度，还赋予材料地质历史——提醒人们大理石经历了数百万年的过程。
任务：
1. 如果你站在螺旋前面，什么样的形状在正确的位置上有孔？
2. 描述艺术家 5 个字母名字附近人物静脉的颜色和形状。它们是薄的还是宽的、水平的、垂直的、对角的？
3. 您认为哪种矿物质可能导致该大理石中出现黑色纹理？石墨、氧化铁还是其他矿物质？
4. 哪些地质过程导致了黑色矿脉的形成？
5. 触摸旋转/螺旋内的弹珠。描述表面（例如光滑、粗糙）。造成这个表面的原因是什么？
6. 可选：您自己或现场物体的照片。
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