Noranda Caldera - AbsoluteAstronomy.com

The Noranda Caldera is a well-known large subaqueous 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...

caldera

Caldera

A caldera is a cauldron-like volcanic feature usually formed by the collapse of land following a volcanic eruption, such as the one at Yellowstone National Park in the US. They are sometimes confused with volcanic craters...

complex within the Blake River Megacaldera Complex

Blake River Megacaldera Complex

The Blake River Megacaldera Complex, also called the Blake River Group, is a giant subaqueous caldera cluster or a nested caldera system that spans across the Ontario-Quebec border in Canada....

, Quebec

Quebec

Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

, 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...

. The caldera contains a 7-to-9-km-thick succession of bimodal mafic

Mafic

Mafic is an adjective describing a silicate mineral or rock that is rich in magnesium and iron; the term is a portmanteau of the words "magnesium" and "ferric". Most mafic minerals are dark in color and the relative density is greater than 3. Common rock-forming mafic minerals include olivine,...

-felsic

Felsic

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....

tholeiitic to calc-alkaline volcanic rock

Volcanic rock

Volcanic rock is a rock formed from magma erupted from a volcano. In other words, it is an igneous rock of volcanic origin...

s which were erupted during five major series of volcanic activity.

The metallogenic

Metallogeny

Metallogeny is the study of the genesis and regional to global distribution of mineral deposits, with emphasis on their relationship in space and time to regional petrologic and tectonic features of the Earth's crust.-References:...

impact of the Noranda Caldera is well-known, but the importance of the New Senator Caldera

New Senator Caldera

The New Senator Caldera is a large striking Archean caldera complex within the heart of the Blake River Megacaldera Complex, Quebec, Canada. It has a diameter of 15-30 kilometers and is made of thick massive mafic sequences. The caldera complex has inferred to be a subaqueous lava lake during the...

and Misema Caldera

Misema Caldera

The Misema Caldera is a striking 2,704-2,707 million year old caldera in Ontario and Quebec, Canada.- Geographic extent :It is the caldera that forms the Blake River Megacaldera Complex and has a diameter of 40-80 kilometers.- Composition :...

remains to be evaluated.

See also