WebThe Gunflint chert is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern Ontario along the north shore of Lake Superior. The Gunflint Chert is of paleontological significance, as it contains evidence of microbial life from the Paleoproterozoic.[2] The Gunflint Chert is composed of … WebAug 20, 2024 · Here, we report the widespread presence of solidified oil (pyrobitumen) in the iron formation of the 1.88 Ga Gunflint Formation, Ontario, Canada. Petrographic textures indicate at least two phases of oil migration, an early phase marked by pyrobitumen in granules and intergranular pores, synchronous with synsedimentary silica …
Geology of the Biwabik Iron Formation and Duluth Complex
WebThe Gunflint Formation was deposited on an Archean basement at the southwestern margin of the Superior Province (see Canadian Precambrian Shield).Occurrence of granular peloidal and oolitic iron formations or taconite (an iron-bearing, high-silica, chert-like rock) characterizes the Gunflint Formation. WebBreccia containing large fragments of Gunflint Iron Formation. Hammer for scale is 16 inches long. Only the uppermost part of the layer at Gunflint Lake contains true … mhwirth pump
SUDBURY IMPACT STRUCTURE – Crater Explorer
WebOct 1, 2008 · The Gunflint and Biwabik Iron Formations were continuous prior to emplacement of the Duluth Complex, and thus the date is an approximate age for deposition of the Biwabik Iron Formation and associated Animikie strata. The Animikie Group rests unconformably on granite, greenstone, and other rocks of the Archean (greater than 2.4 … WebTwo new algal taxa are described from the approximately 2,000 m.y. old Gunflint Iron Formation, Ontario. Leptoteichos golubicii, n. gen. et sp., were relatively large (5-31 … WebMay 10, 2024 · The approximate upper age limit of the Gunflint Formation is based on the U-Pb age of 1.87 Ga (Morey, 1969; Fralick et al.,2002) for the upper Gunflint Formation and the overlying Rove Formation. The Gunflint Formation is a 120 m thick succession of metasedimentary strata that includes siliciclastic, carbonate, chert, and iron formation ... how to cancel saving account bankmobile