Sturgeon Lake Caldera
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Sturgeon Lake Caldera is a large extinct caldera complex in Kenora District of Northwestern Ontario, Canada. It is one of the world's best preserved mineralized Neoarchean caldera complexes, containing well-preserved mafic-intermediate pillow lavas, pillow breccias, hyaloclastite and peperites, submarine lava domes and dome-associated breccia deposits. The complex is some 2.7 billion years old[1] with a minimum strike length of Script error: No such module "convert"..
Geology
The Sturgeon Lake Caldera contains a well preserved north facing homoclinal chain of greenschist facies metamorphosed intrusive, volcanic, and sedimentary layers. This piecemeal caldera complex includes nearly Script error: No such module "convert". of major subaqueously deposited intracaldera fill. Episodes of subaerial and subaqueous explosive felsic volcanism created rhyodacitic to rhyolitic tuffs and lapilli tuffs. The caldera complex lies in the Wabigoon greenstone belt.
The Sturgeon Lake Caldera contains volcanic units that outcrop over Script error: No such module "convert". from east to west with up to five separate, major ash flow tuff units with thickness ranging from Script error: No such module "convert". to Script error: No such module "convert".. The Mattabi pyroclastic flow, with a thickness in excess of Script error: No such module "convert". and a strike length of at least Script error: No such module "convert"., is the third and most voluminous eruptive event associated with the Sturgeon Lake Caldera. It hosts the 12-Mt Mattabi massive sulfide deposit which is interpreted to have formed on and below the seafloor, the latter through the processes of pore-space filling and replacement.
See also
References
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- ↑ Caldera Volcanoes Retrieved on 2007-07-20
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