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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Duluth Complex
Reconstructing diagenetic mineral reactions from silicified horizons of the Paleoproterozoic Biwabik Iron Formation, Minnesota Available to Purchase
High-precision U-Pb geochronology links magmatism in the Southwestern Laurentia large igneous province and Midcontinent Rift Open Access
Extreme isotopic heterogeneity in impact melt rocks: Implications for Martian meteorites Available to Purchase
Complex Effects of Assimilation on Sulfide Saturation Revealed by Modeling with the Magma Chamber Simulator: A Case Study on the Duluth Complex, Minnesota, USA Available to Purchase
Cu and Ni Isotope Variations of Country Rock-Hosted Massive Sulfides Located Near Midcontinent Rift Intrusions Available to Purchase
Posteruptive Thermal History of the Proterozoic Basaltic North Shore Volcanic Group of the Midcontinent Rift: Evidence from K/Ar Data of Celadonite Open Access
Rapid emplacement of massive Duluth Complex intrusions within the North American Midcontinent Rift Available to Purchase
Lopolith – A 100 year-old term. Is it still definitive? Available to Purchase
Study on structure variations of incommensurately modulated labradorite feldspars with different cooling histories Available to Purchase
Nanoscale constraints on porosity generation and fluid flow during serpentinization Available to Purchase
Partial Melting Processes and Cu-Ni-PGE Mineralization in the Footwall of the South Kawishiwi Intrusion at the Spruce Road Deposit, Duluth Complex, Minnesota Available to Purchase
ARSENIC-RICH Cu-Ni-PGE MINERALIZATION IN WETLEGS, DULUTH COMPLEX, ST. LOUIS COUNTY, MINNESOTA, USA Available to Purchase
CLINOFERROGEDRITE IN THE CONTACT-METAMORPHOSED BIWABIK IRON FORMATION, NORTHEASTERN MINNESOTA Available to Purchase
SELENIUM AND SULFUR CONCENTRATIONS IN COUNTRY ROCKS FROM THE DULUTH COMPLEX, MINNESOTA, USA: IMPLICATIONS FOR FORMATION OF THE Cu-Ni-PGE SULFIDES Available to Purchase
Ni-Cu-PGE Mineralization in the Partridge River, South Kawishiwi, and Eagle Intrusions: A Review of Contrasting Styles of Sulfide-Rich Occurrences in the Midcontinent Rift System Available to Purchase
Cu-Ni-PGE Mineralization in the South Filson Creek Area, South Kawishiwi Intrusion, Duluth Complex: Mineralization Styles and Magmatic and Hydrothermal Processes Available to Purchase
Layered intrusions of the Duluth Complex Available to Purchase
ABSTRACT A diverse range of plutonic to hypabyssal intrusions related to the 1.1 Ga Mid-continent Rift occurs in northeastern Minnesota. These intrusions are grouped into two complexes based on their structural occurrence within the North Shore Volcanic Group (NSVG, a comagmatic volcanic edifice) and their range of emplacement ages. The better known Duluth Complex is composed of gabbroic, anorthositic, and granitic intrusions that were emplaced into the base of the NSVG between 1108 and 1098 Ma. The Beaver Bay Complex is composed of a comparable range of intrusions that were emplaced into more medial sections of the NSVG between 1098 and 1095Ma. This field trip will profile the igneous stratigraphies of two of the best-studied mafic layered intrusions associated with the Midcontinent Rift. The Sonju Lake intrusion is a 1-km-thick lake intrusion associated with the Beaver Bay Complex that shows a classic Skaergaard-type cumulate stratigraphy indicative of closed-system fractional crystallization of a tholeiitic magma. The Layered Series at Duluth (DLS) is a well-differentiated, 4-km-thick sheet-like intrusion that is the type-intrusion of the Duluth Complex. Phase and cryptic layering through the DLS indicates that it evolved as a more open system due to periodic recharge and venting.
Pre-and-early Agassiz outlets to the western Superior Basin Available to Purchase
ABSTRACT The deglaciation history of northeastern Minnesota and northwestern Ontario is outlined using geological and ichthyofaunal evidence from the continental to local scales. Both published and new data indicate the existence of eastern outlets drawing from pre-and-early Agassiz lakes. Part of the Arctic watershed was impounded between the Duluth Complex highlands and the retreating Rainy lobe. These outlets had their flows routed through the “Keating Complex” and the “Gunflint Arrow Lakes Corridor.” Discharges around the Duluth Complex’s northeast limb reached the Superior basin along Superior lobe ice, then exited down existing pre-glacial river valleys and a prominent, “valley-type” topographic bench between Hovland and Grand Marais, Minnesota.