What is the granite of Yakushima? An easy-to-understand explanation of how to read it, its geological features, and how the island was formed.
What is the granite of Yakushima?
Discover the geological secrets that produce spectacular scenery.
Yakushima is,Most of the center is composed of granite.It is a very rare island and is of global geological interest.
Unlike islands formed by volcanic eruptions, the main feature of these islands is that rocks formed deep underground have been uplifted to the surface.
This article explains how to read the granite of Yakushima, its geological features, and its formation in an easy-to-understand manner for beginners.â
◆A person who is interested in the nature and geology of Yakushima Island.
◆To know how to read the granite of Yakushima and its characteristics.
◆Yakushima sightseeing and want to know about the highlights of granite.
◆Those who want to understand the origins of Yakushima and the reasons for its topography.
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Yakushima Island
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Reading and basic knowledge of the granite of Yakushima Island
For a deeper understanding of the nature of Yakushima,Basic knowledge of graniteIt is important to keep in mind that the
Knowing how to read and what it means will greatly change the way you see the topography and landscape.
Let's start by sorting through the basic points.
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Correct reading and meaning of granite
Granite is a "rock ofgraniteand reads, "Magma slowly cooled and solidified deep underground.A type of plutonic rockIt is.
It is composed of minerals such as quartz, feldspar, and biotite, and is characterized by large, hard grains.
Because of its excellent durability, it is widely used as a building material and stone.
Why is the granite of Yakushima attracting attention?
On Yakushima Island, granite is distributed over a wide area, mainly in the mountains, and its large scale is attractive.
Weathering and erosion over the years have created a unique topography,Value as a tourist resourceis also increasing.
The field is highly regarded as a natural heritage site and is also a field of academic interest.
Geological Features of Yakushima
Why is it called Granite Island?
Yakushima Island is known for its "Granite IslandAlthough sometimes referred to as "the rock", there are in fact multiple rocks.
The geological structure of the central part of the island is particularly unique and is closely related to the formation of the island.
Let's look at the specific reasons for this here.
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Distribution of granite covering most of Yakushima
From the central part of Yakushima to the mountainous areas,Huge granite bodyis spreading.
The area around Miyanoura-dake is characterized by large exposures of granite, forming a dynamic landscape.
On the other hand, sedimentary rocks are also found in coastal areas,Diverse geology throughout the islandcoexist.
Differences from other rocks and geological structures
Granite has larger and harder crystals than volcanic or sedimentary rocks.Erosion-resistant propertiesWe have a
As a result, the mountainous terrain tends to become steep, forming the rugged terrain unique to Yakushima.
This geological structure also contributes to the rich natural environment and abundant precipitation.
| Rock Types | way of making | feature | representative example |
|---|---|---|---|
| granite | Magma slowly cools and hardens underground. | Grains are large, hard, and resistant to erosion | Mountains of Yakushima |
| volcanic rock | Magma rapidly cools and solidifies on the surface of the earth. | Grains are fine and relatively brittle | Basalt and andesite |
| sedimentary rock | Sand and mud accumulate and harden | Layered structure, soft and easily eroded | Sandstone and mudstone |
Characteristics of feldspar and minerals in the Yakushima granite
Granite is composed of several minerals, each of which creates differences in appearance and properties.
One of the charms of this product is that you can clearly see the differences in color and pattern when you actually observe it.
This section describes the characteristics of typical minerals.
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Yakushima Island
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What are feldspar, quartz, and biotite that make up granite?
Granite is primarilyfeldspar, ,quartz, ,biotiteIt is composed of three minerals.
Feldspar is seen as white or pale pink, quartz as transparent grains, and biotite as black flakes.
The combination of these elements produces the speckled patterns characteristic of granite.
The source of the bright color of the granite.
The most abundant minerals in white and pink
◆Quartz
Hard and weather-resistant properties
Transparent to translucent, glass-like appearance
◆ biotite
It serves to tighten the overall color.
Black, thin, flaky mineral
Reasons for differences in appearance and color
The hue of granite varies depending on the proportion of minerals it contains.
Bright with many feldsparsThe first two are the first and the last,Subdued color with a lot of biotiteThe feature of the product is that it becomes
The fact that the expression differs from place to place is also a pleasure to observe.
Origin of Yakushima
The history of the earth from which granite was formed
The topography of Yakushima has been formed over the long history of the earth.
Understanding how the granite was created and how it came to be what it is today will help you understand it better.
Here we organize the process from formation to uplift.
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Formation process of granite due to magmatic activity
Granite isMagma cools slowly deep underground.It is formed by
The crystals grow over time, resulting in larger grains.
It has different properties from volcanic rocks, which are formed by rapid cooling.
Why did the island rise and become the Yakushima of today?
The formed granite body is,Crustal deformation due to plate movementThe area was gradually elevated in the
Subsequent erosion by rain and wind has shaped the present topography.
Repeated uplift and erosion have created the dynamic landscape of Yakushima.
Yakushima Island is not a volcano? Relationship with Eruption
Yakushima is sometimes confused with a volcanic island, but its origins are very different.
A correct understanding will lead to a better understanding of geology.
Here we will sort out the differences from volcanoes.â
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Differences from volcanic islands and points of misunderstanding
Volcanic islands are formed by eruptions, though,Yakushima is an island made mainly of graniteIt is.
There are no active volcanoes at present, but the effects of past volcanic activity can be seen in the surrounding area.
This difference is easily misunderstood!
Relationship between past crustal deformation and present topography
Yakushima Island is thought to have been uplifted by plate movement.
It is due to this tectonic movement that the underground granite has appeared on the surface of the earth.
The present steep mountainous terrain is the result of that long period of fluctuation.
What are the topographical features of Yakushima?
Spectacular view created by granite
The landscape of Yakushima is largely shaped by the nature of the granite.
The area is characterized by its unique topography, including rounded rocks and huge boulders.
Here.Typical Highlightsâ
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Why are there so many rounded rocks and huge rocks?
As the granite weathers, the corners are removed and the rock becomes rounded.
The soft forms were formed by years of erosion from rain and wind.
This is.The unique landscape of YakushimaIt is connected to the
Tofu Rock and other distinctive spots and attractions
Yakushima Island hasUnique rock called Tofu Rockand is a well-known tourist attraction.
The regular shape is due to cracking and weathering.
It is one of the highlights to be seen during the trekking.
◆Time required for climbing: Approx. 6-7 hours round trip (Yodogawa trailhead - Hananoe River is about 2.5-3 hours one way)
Can I bring back stones from Yakushima?
It is sometimes tempting to take home stones you find while sightseeing, but you need to check the rules.
To protect the natural environment,Certain restrictions on collectionis established.
Here are some things to keep in mind!
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Rules for protection as a natural park
Yakushima Island is included in a national park,Restricted collection of natural objects in many areasThe company has been
Rules are strictly enforced, especially in protected areas.
Basically, you don't take it home.is the principle!
Manners and precautions to keep in mind when sightseeing
To protect the natural environment, basic manners are important in addition to not taking rocks home.
You are expected to stay on the trail and take your trash with you.
Enjoy sustainable tourism with awareness... ♪
Many areas on the island have few trash cans to protect the natural environment.
◆Do not feed wild animals
Observe at a distance to avoid impact on the ecosystem
◆Check the weather and equipment in advance
Yakushima's weather is changeable, so safety measures are important.
◆Not to deviate from trails and boardwalks
Walking along a designated route to protect vegetation and prevent accidents
◆Natural objects such as rocks and plants are not to be taken home.
Yakushima Island has many protected areas, and collection is restricted.
If you want to enjoy Yakushima with peace of mind
＼Yakushima eco-tour participation is recommended/.
Frequently Asked Questions (FAQ) about Yakushima and Granite
summary
Yakushima Island isGeology mainly graniteA very distinctive island formed by the
Understanding how to read, the characteristics of minerals, and how they differ from volcanoes will greatly change the way you see nature.
When visiting, please observe the rules and manners and enjoy this precious natural environment with care.
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