コマチアイト

コマチアイト

Volcanic rock

コマチアイト of the Canadian shield, size 9cm

A project: Earth science /Portal: Earth science

A kind of the volcanic rock where it is thought that コマチアイト (British: komatiite^[1]) comes from a quality of super pain iron mantle.

The name comes from the South African Komachi River.

Table of contents

Property, the that it features it

Magnesium is high more than 18% and is different from the kimberlite which is rich in potassium others because the ingredient of silica and others has few characteristics. Rocks of the Archeozoic era are often found and receive metamorphism. It is 1,600 degrees Celsius, and the melting point of this magma is higher than basalt, and it is estimated that the earth at the time was a high temperature more.

I am distributed between two kinds in having aluminum or not. This depends on partial molten degree in the mantle inside.

Chemical composition

Ingredient	コマチアイト [2]
SiO2	45.8
TiO2	0.30
Al2O3	7.30
Cr2O3	0.20
Fe2O3	―
FeO	11.2
MnO	―
MgO	26.1
CaO	7.60
Na2O	0.70
K2O	0.10
P2O5	―
The total	99.3

Fluidity got into the crack remarkably, and the コマチアイト lava did not create the warm sedimentation layer. But deposit value is high in Australia, Canada, South Africa, a Guyanese shield to have possibilities to have thickness of 500m into a sill form, and to be full of nickel, cobalt, money.

Footnote

[Help]

1. For ^ Geological Society of Japan "geology vocabulary - Japanese and English, English and Japanese" Kyoritsu publication, 2,004 years, it is page 328. ISBN 4-320-04643-9。
2. It is page 631 for Maruzen, 2,007 years in ^ National Astronomical Observatory "chemical composition "science chronological table 2008" of the main igneous rock". ISBN 978-4-621-07902-7。

References

• For Akiho Miyashiro, Ikuo Kushiro "origin Kyoritsu publication 〈 Kyoritsu complete works 〉, 1,977 years of the lithology III - rock", it is page 193. ISBN 4-320-00214-8。
• For Yoshimasu Kuroda, Kanenori Suwa "polarizing microscope and rock mineral second edition" Kyoritsu publication, 1,983 years, it is 257-259 pages. ISBN 4-320-04578-5。

Allied item

Wiki media Commons has a category in conjunction with コマチアイト.

• Rock - Igneous rock - Volcanic rock
• Ultrabasic rocks, quality of super pain iron rock
• List of rocks

Outside link

• "コマチアイト". Geological feature specimen building. National Institute of Advanced Industrial Science and Technology geological survey synthesis center. June 7, 2011 reading.

This item is an unfinished item in conjunction with the earth sciences. I demand the cooperator who corrects it, and corrects this item (a project: earth science /Portal: earth science).

It is acquired by "https://ja.wikipedia.org/w/index.php?title= コマチアイト &oldid=61907995"

This article is taken from the Japanese Wikipedia コマチアイト

This article is distributed by cc-by-sa or GFDL license in accordance with the provisions of Wikipedia.

Wikipedia and Tranpedia does not guarantee the accuracy of this document. See our disclaimer for more information.

In addition, Tranpedia is simply not responsible for any show is only by translating the writings of foreign licenses that are compatible with CC-BY-SA license information.