Yubari Mountains
Encyclopedia
is a mountain range
of Hokkaidō
, Japan
.
Part of this range is protected by the .
. The mountains are the result of the collision between the Kurile Island Arc
and the Northeastern Japan Arc
. Three formations make up the Yūbari mountains:
Mountain range
A mountain range is a single, large mass consisting of a succession of mountains or narrowly spaced mountain ridges, with or without peaks, closely related in position, direction, formation, and age; a component part of a mountain system or of a mountain chain...
of Hokkaidō
Hokkaido
, formerly known as Ezo, Yezo, Yeso, or Yesso, is Japan's second largest island; it is also the largest and northernmost of Japan's 47 prefectural-level subdivisions. The Tsugaru Strait separates Hokkaido from Honshu, although the two islands are connected by the underwater railway Seikan Tunnel...
, Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
.
Part of this range is protected by the .
Geology
The Yūbari Mountains continue the north-south line begun by the Teshio MountainsTeshio Mountains
Teshio Mountains is a mountain range of Hokkaidō, Japan....
. The mountains are the result of the collision between the Kurile Island Arc
Kuril Islands
The Kuril Islands , in Russia's Sakhalin Oblast region, form a volcanic archipelago that stretches approximately northeast from Hokkaidō, Japan, to Kamchatka, Russia, separating the Sea of Okhotsk from the North Pacific Ocean. There are 56 islands and many more minor rocks. It consists of Greater...
and the Northeastern Japan Arc
Northeastern Japan Arc
Northeastern Japan Arc also Northeastern Honshū Arc, is an island arc on the Pacific Ring of Fire. The arc runs north to south along the Tohoku region of Honshū, Japan. It is the result of the subduction of the Pacific Plate underneath the North American Plate at the Japan Trench...
. Three formations make up the Yūbari mountains:
- Jurassic-Cretaceous formations. This forms the main ridge. It consists of serpentine and rocks of the Sorachi Group. The Sorachi Group consists of chertChertChert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock that may contain small fossils. It varies greatly in color , but most often manifests as gray, brown, grayish brown and light green to rusty red; its color is an expression of trace elements...
, greenschistGreenschistGreenschist is a general field petrologic term applied to metamorphic or altered mafic volcanic rock. The term greenstone is sometimes used to refer to greenschist but can refer to other rock types too. The green is due to abundant green chlorite, actinolite and epidote minerals that dominate the...
, micriteMicriteMicrite is a limestone constituent formed of calcareous particles ranging in diameter up to 4 μm formed by the recrystallization of lime mud.The term was coined in 1959 by Robert Folk for his carbonate rock classification system...
limestoneLimestoneLimestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate . Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera....
, and sandstoneSandstoneSandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...
with felsicFelsicThe word "felsic" is a term used in geology to refer to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium....
tuffTuffTuff is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff is sometimes called tufa, particularly when used as construction material, although tufa also refers to a quite different rock. Rock that contains greater than 50% tuff is considered...
. - Cretaceous forearc sediments. These rocks of the Yezo Supergroup are arranged around the Jurassic-Creaceous formations.
- Paleogene formations. These rocks lie to the west of the Cretaceous sediments. The paleogene formations include seams of coalCoalCoal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure...
.
Peaks
- Mount YūbariMount Yūbariis a mountain of the Yūbari Mountains. It is located On the border of Minamifurano, Yūbari, Hokkaidō, Japan.-References:* * , Charm of Hokkaido...
- Mount AshibetsuMount Ashibetsuis a mountain located on the border between Ashibetsu and Furano, Hokkaidō, Japan. It is part of the Yūbari Mountains.-External links:* , at 北海道の旅,...
- Mount Furano Nishi
- Mount Torumukeppu
- Mount Hattaomanai
- Mount Kirigishi
- Mount HachimoriMount Hachimori (Yūbari)is a mountain of the Yūbari Mountains. It is located on the border of Minamifurano, Yūbari, Hokkaidō, Japan. The mountain is the source of the Yūbari River.-References:*...