Sherman volcano
Encyclopedia
The Sherman volcano is a possible prehistoric volcano
in the municipality of Temagami
in Northeastern Ontario
, Canada
. Geological evidence indicates that it was located west of the abandoned Sherman Mine
and lies in the Archean
Temagami greenstone belt
.
lava
flows exist between Turtle Lake
and Link Lake
, the largest of which indicates that its volcanic vent existed at the western end of Link Lake. The existence of facies
changes and remnants of lava movement exposed in the wedge of the Turtle Lake Formation are likely further indications that the volcano was located west of Link Lake. Also, jagged felsic tuff
s exist in feldspar
-phyric pyroclastic deposits
exposed in the Sherman Mine area.
Volcano
2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...
in the municipality of Temagami
Temagami, Ontario
Temagami, formerly spelt as Timagami, is a region and a municipality in northeastern Ontario, Canada, in the District of Nipissing with Lake Temagami at its heart....
in Northeastern Ontario
Northeastern Ontario
Northeastern Ontario is the region within the Canadian province of Ontario which lies north and east of Lakes Superior and Huron.Northeastern Ontario consists of the districts of Algoma, Sudbury, Cochrane, Timiskaming, Nipissing and Manitoulin; and the single-tier municipality of Greater...
, Canada
Canada
Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
. Geological evidence indicates that it was located west of the abandoned Sherman Mine
Sherman Mine
Sherman Mine is a large abandoned open pit mine in Temagami, Ontario, Canada. It was a major producer of iron ore. The mine was the source of a multi-ton boulder of banded iron formation and was mined from 1967 until 1990 by Cleveland-Cliffs Iron Company...
and lies in the Archean
Archean
The Archean , also spelled Archeozoic or Archæozoic) is a geologic eon before the Paleoproterozoic Era of the Proterozoic Eon, before 2.5 Ga ago. Instead of being based on stratigraphy, this date is defined chronometrically...
Temagami greenstone belt
Temagami greenstone belt
The Temagami greenstone belt, also known as the Temagami volcanic belt and the Temagami metavolcanic belt, is a small 2.7 billion year old greenstone belt in the Temagami region of Northeastern Ontario, Canada...
.
Evidence
A number of volcanic features have been found that suggests the volcano was located west of Sherman Mine. At least two outcrops of felsicFelsic
The 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....
lava
Lava
Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...
flows exist between Turtle Lake
Turtle Lake (Temagami)
Turtle Lake is an east-west trending lake in Strathy Township, Temagami, Nipissing District in Northeastern Ontario, Canada. It lies in the Sherman Mine property between the South and East pits. It is also the location of an abandoned jack ladder along its southern shore that floated logs to the...
and Link Lake
Link Lake (Ontario)
Link Lake is a narrow lake in the Ottawa River drainage basin in Strathy Township, Temagami, Nipissing District of Northeastern Ontario, Canada...
, the largest of which indicates that its volcanic vent existed at the western end of Link Lake. The existence of facies
Facies
In geology, facies are a body of rock with specified characteristics. Ideally, a facies is a distinctive rock unit that forms under certain conditions of sedimentation, reflecting a particular process or environment....
changes and remnants of lava movement exposed in the wedge of the Turtle Lake Formation are likely further indications that the volcano was located west of Link Lake. Also, jagged felsic tuff
Tuff
Tuff 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...
s exist in feldspar
Feldspar
Feldspars are a group of rock-forming tectosilicate minerals which make up as much as 60% of the Earth's crust....
-phyric pyroclastic deposits
Pyroclastic rock
Pyroclastic rocks or pyroclastics are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked through mechanical action, such as by wind or water, these rocks are termed volcaniclastic...
exposed in the Sherman Mine area.
See also
- Volcanism of Eastern CanadaVolcanism of Eastern CanadaVolcanism of Eastern Canada has led to the formation of hundreds of volcanic areas and extensive lava formations, indicating volcanism played a major role in shaping its surface. The region's different volcano and lava types originate from different tectonic settings and types of volcanic...
- List of volcanoes of Canada