GCB4QGG [EC-266] 上海的花岗岩纪念碑 (Earthcache) in China created by Silka03

GCB4QGG ▼

A cache by Silka03 Message this owner

Hidden : 2/21/2025

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Size: Size: other (other)

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欢迎您，地质探险家们！准备好踏上地质探险之旅，探索这座令人印象深刻的花岗岩纪念碑。在旅途中，您将深入了解花岗岩的形成故事，识别其独特的矿物，并观察随着时间的推移塑造这块经久不衰岩石的强大力量。

任务

仔细观察花岗岩，识别至少两种不同的矿物。注意它们的颜色、质地和反射特性。这些特征如何帮助你区分它们？

检查古迹表面是否有明显的矿脉、晶体结构或图案。这些特征对花岗岩的冷却和结晶过程有何启示？

思考选择花岗岩作为纪念碑材料的原因。是什么让它成为户外建筑的合适选择，尤其是在耐用性和外观方面？

在纪念碑前为自己或个人物品拍一张照片，以确认您的访问。将此照片附在您的日志中。

将此缓存记录为 “找到了”，并将问题答案发送至 “silka03.earthcache@gmail.com ”或通过 Geocaching 消息中心发送给我。不要写在日志中！然后您可以立即登录。我会与您联系。

玩得开心

揭开花岗岩的起源：花岗岩是一种侵入性火成岩，是熔融岩浆在地壳深处随着时间的推移慢慢冷却而形成的。让我们一步步分解这个过程：

岩浆生成：在地表之下，强烈的热量和压力熔化了原有的岩石，形成岩浆。

岩浆上升：岩浆的密度低于周围岩石，因此会通过裂缝缓慢上升。

结晶：随着岩浆在地下逐渐冷却，会形成大块矿物晶体，从而形成花岗岩特有的粗糙质地。

暴露：经过数百万年的侵蚀和地质隆起，这些曾经被隐藏的岩层逐渐暴露出来，花岗岩也随之浮出地表，成为我们今天欣赏的对象。

花岗岩的矿物成分：花岗岩由几种主要矿物组成，每种矿物都造就了花岗岩独特的外观和特征：

石英：石英通常呈透明、灰色或烟雾状，具有很强的抗风化能力，可增强花岗岩的整体强度。

长石：长石是花岗岩中含量最多的矿物，通常呈白色、粉红色或灰色，并赋予岩石许多颜色。

云母：云母以黝帘石（浅色、反光）或黑云母（深色、有光泽）的形式存在，可增加微妙的光泽，增强岩石的视觉吸引力。

仔细观察石碑就会发现这些矿物，它们各自讲述着花岗岩的地质故事。

历久弥新：风化和耐久性：花岗岩以其耐久性而闻名，但即使是这种坚硬的岩石也无法抵御自然的力量：

物理风化：温度波动会导致岩石膨胀和收缩，久而久之就会出现裂缝和表面剥落。

化学风化：水与长石等矿物质发生反应，产生粘土，微妙地改变石头的表面。

氧化：花岗岩中富含铁的矿物质暴露在氧气中会生锈，形成红褐色条纹。

这些风化过程为了解纪念碑所经历的环境条件提供了宝贵的线索。

为什么用花岗岩制作纪念碑？花岗岩因其卓越的品质经常被选为纪念碑的材料：

耐久性：花岗岩的硬度和抗风化性使其成为经受户外条件考验的理想材料。

美观：独特的矿物混合使每块花岗岩都具有独一无二的外观。

历史意义：花岗岩经得起风吹雨打，这意味着用这种岩石雕刻的纪念碑可以世代流传，保存故事和历史。

Welcome, Geocachers! Get ready to embark on a geological adventure as you explore this impressive granite monument. Along the journey, you’ll delve into the story of granite's formation, identify its distinct minerals, and observe the powerful forces that have shaped this enduring rock over time.

Tasks:

Closely observe the granite and identify at least two distinct minerals. Pay attention to their color, texture, and reflective qualities. How do these characteristics help you distinguish them?
Examine the monument's surface for visible veins, crystal structures, or patterns. What insights do these features provide about the granite’s cooling and crystallization process?
Reflect on the reasons granite was selected for this monument. What makes it a suitable choice for outdoor structures, particularly in terms of durability and appearance?
Take a photo of yourself or a personal item at the monument to confirm your visit. Attach this with your log.

Log this cache as “Found it” and send me the answers to the questions to “silka03.earthcache@gmail.com” or via Geocaching Message Center. Not in your log! You may then log immediately. I will get in touch with you.

Have fun!

Unraveling Granite's Origins: Granite is an intrusive igneous rock, formed deep beneath the Earth’s crust when molten magma cools slowly over time. Let’s break down the process step-by-step:

Magma Generation: Beneath the surface, intense heat and pressure melt pre-existing rocks, creating magma.
Magma Ascent: Being less dense than the surrounding rock, magma rises slowly through fractures and cracks.
Crystallization: As the magma cools gradually underground, large mineral crystals develop, giving granite its signature coarse texture.
Exposure: Over millions of years, erosion and geological uplift expose these once-hidden formations, bringing granite to the surface where we can admire it today.

Granite's Mineral Composition: Granite is composed of several key minerals, each contributing to its unique appearance and characteristics:

Quartz: Typically clear, gray, or smoky, quartz is highly resistant to weathering and adds to granite’s overall strength.
Feldspar: The most abundant mineral in granite, feldspar often appears white, pink, or gray and gives the rock much of its color.
Mica: Present as muscovite (light and reflective) or biotite (dark and glossy), mica adds subtle shimmer and enhances the rock's visual appeal.

Carefully inspecting the monument will reveal these minerals, each telling a part of granite's geological story.

Endurance Through Time: Weathering and Durability: Granite is renowned for its durability, but even this tough rock isn’t immune to the forces of nature:

Physical Weathering: Temperature fluctuations cause the rock to expand and contract, leading to cracks and surface flaking over time.
Chemical Weathering: Water reacts with minerals like feldspar, creating clay and subtly altering the stone's surface.
Oxidation: When iron-rich minerals within the granite are exposed to oxygen, they can rust, forming reddish-brown streaks.

These weathering processes provide valuable clues about the environmental conditions the monument has endured.

Why Granite for Monuments? Granite is often chosen for monuments due to its remarkable qualities:

Durability: Its hardness and resistance to weathering make it ideal for enduring outdoor conditions.
Aesthetic Appeal: The unique blend of minerals gives each piece of granite a one-of-a-kind appearance.
Historical Significance: Granite's ability to withstand the elements means monuments carved from this rock can last for generations, preserving stories and history.