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Mineralization of the Platteville -Decorah contact zone

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Journal Article
Published: 01 September 2018
Environmental Geosciences (2018) 25 (3): 101–119.
... of northern Illinois with potable water ( Abrams et al., 2015 ). Because of the purity of the quartz sand, the formation is also a valuable industrial mineral that is actively mined in the region ( Visocky et al., 1985 ). Figure 1. Stratigraphic column for northern Illinois. The Galena, Platteville...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 1942
AAPG Bulletin (1942) 26 (1): 36–62.
... (criterion 8) as in the Batesville district. ‡ Pettijohn ** found traces of manganese with phosphate and pyrite in the Platteville. Associations, relative concentration, and thickness of the zone may be important. 10. Iron oxide zones .—Concentrations of iron oxide are known to occur in association...
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1969
AAPG Bulletin (1969) 53 (1): 55–72.
... in concentration of brines in a thin zone at and just below the sediment surface. Calcium content is reduced by precipitation of either calcium carbonate or gypsum; the remaining heavy brine with a high Mg: Ca ratio is capable of inducing metasomatic replacement of carbonate mud on contact. First to form is poorly...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 1963
AAPG Bulletin (1963) 47 (12): 2015–2022.
... formations are not recognized in the disturbed zone. No trace was found of the Galena and Platteville Formations and the St. Peter Sandstone, all of which have distinctive subdivisions that are widely recognized in the region. Some blocks may be Lower Ordovician, but the oolitic chert, coarse-grained...
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Journal Article
Journal: PALAIOS
Published: 01 October 2009
PALAIOS (2009) 24 (10): 627–637.
...° to the southeast and unconformably overlie Ordovician units ( Reinertsen et al., 1992 ). The locality lies on the northern edge of the Illinois Basin, ∼65 km east of the crest of the La Salle Anticlinorium ( Nelson, 1995 ) and ∼7.5 km southwest of the Sandwich Fault Zone on the upthrown side of the fault...
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Journal Article
Published: 01 January 2003
Micropaleontology (2003) 49 (2): 109–126.
... , and ellipsocephalids. The age Middle Cambrian indicated by these fossils is the first definitive age ever provided for these rocks. PLATE 1 A Clayton Park lens (site 1) is shown encased in quartzite with an aureole of chert (contact zone in this photo). There are organic and light brown sand layers dipping...
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Journal Article
Journal: PALAIOS
Published: 12 June 2018
PALAIOS (2018) 33 (6): 256–265.
.... Diagenetic rims of glauconitic mineralization were evident around many of the glauconitic pellets. The rims were bent and broken with the glauconitic grain, which suggests fracture during detrital processes. Grain contacts varied from sutured line contacts between some quartz grains, to concavo-convex...
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Journal Article
Journal: GSA Bulletin
Published: 01 August 2001
GSA Bulletin (2001) 113 (8): 1092–1104.
... , Midcontinent U.S. fault and fold zones: A legacy of Proterozoic intracratonic extensional tectonism? : Geology , 24 . 151 – 154 . Mathieu , Y. , and Velde , B. , 1989 , Identification of thermal anomalies using clay mineral composition : Clay Minerals , 24 . 591 – 602 . Matthews...
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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1961
AAPG Bulletin (1961) 45 (8): 1364–1377.
... the Borrowdale volcanics. The Glenogle slates are correlative with the Skiddaw slates by virtue of the common occurrence of the three Deepkill graptolite zones. This correlation is strengthened if it is considered that there is a pre-“Caradoc” occurrence of Caradoc-like trilobites and brachiopods high...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1959
AAPG Bulletin (1959) 43 (11): 2541–2574.
... uplift. It is contiguous with the northeast platform or shelf in northeastern Oklahoma. Middle Pennsylvanian (Cherokee) rests on eroded Mississippian. 1 Presented at the Southwestern regional meeting in Mineral Wells, Texas, October 22–25, 1958, and the Mid-Continent regional meeting, Wichita...
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Journal Article
Published: 30 November 2023
Journal of Foraminiferal Research (2023) 53 (4): 269–285.
... the upper part of the Holmwood Shale ( Haig et al., 2014 ) and includes the ammonoid Metalegoceras kayi , which Leonova (2011) regarded as Sakmarian. The studied level and the Juresanites beds and Fossil Cliff Member belong to the Pseudoreticulatispora pseudoreticulata Spore-Pollen Zone ( Foster et...
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Journal Article
Published: 18 June 2018
Journal of Paleontology (2018) 92 (5): 850–871.
... referred to as the ‘Bobcaygeon-Verulam contact zone’); material from the Tomlinson Quarry is from the upper Bobcaygeon; and material from the James Dick Quarry is from the lower Verulam. Older collections in the Lake Simcoe region are predominately from the upper Bobcaygeon of the classic Kirkfield Quarry...
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Series: GSA Field Guide
Published: 10 December 2018
DOI: 10.1130/2018.0051(15)
EISBN: 9780813756516
...-Platteville Group photographed in 2007. Note sharp contacts with wall rocks and large clasts (including sphalerite). Marker is ~14 cm long. Figure 7. Well-developed feather structure in shocked St. Peter Sandstone quartz grain. Discovered, photographed, and measured by Jared Morrow. From Morrow...
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Journal Article
Journal: SEG Discovery
Published: 01 January 1997
SEG Discovery (1997) (28): 1–48.
.... Or contact our Reno office at: 0.06g/t Au. Huckleberry was discovered in 1962 by geologists 1315 Greg Street, Suite 107, Sparks NV 89431, or call: (702) 353-4732. working for a subsidiary of Kennecott. There are two zones of mineralization associated with Late Cretaceous, porphyritic PAID ADVERTISEMENT...
Journal Article
Journal: SEG Discovery
Published: 01 July 2000
SEG Discovery (2000) (42): 1–52.
... area in the northwest and the Azen Creek Zone located about 6 km to the southeast. Most of the work to date has focused on the Dana Lake area, where chip sampling of stripped outcrop revealed up to 12.6 g/t PGM (Pt+Pd+Au+Rh). Mineralized zones occur within 100 meters of the contact of a large layered...
Journal Article
Journal: GSA Bulletin
Published: 01 April 2003
GSA Bulletin (2003) 115 (4): 422–433.
... ). Authigenic K-feldspar is genetically related to some Mississippi Valley–type (MVT) ore deposits in the Appalachian basins and the Midcontinent. For example, Hearn et al. (1987) found that authigenic K-feldspar in the Tennessee ore district is locally intergrown with ore minerals and may have formed from...
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Journal Article
Journal: AAPG Bulletin
Published: 15 July 2019
AAPG Bulletin (2019) 103 (7): 1745–1768.
... in contact with the base of the Pennsylvanian shales and in close proximity to the ore deposits. He interpreted this residue as evidence for ascending mineralizing fluids migrating with the bitumen. Dozy (1970) noted that the brines-connate or formation waters from adjacent basins, which might have...
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Journal Article
Journal: SEG Discovery
Published: 01 October 2003
SEG Discovery (2003) (55): 1–48.
... are being formulated for Minerals began work on their ER and within the ma c rocks adjacent to the future work by the company s new Eagle gold projects in the Goodpaster dis- contact zone in the area of the strongest management team consisting of names trict. Work at ER is designed to drill test a magnetic...
Journal Article
Journal: SEG Discovery
Published: 01 July 2018
SEG Discovery (2018) (114): 1–56.
... mineralization, which is Science Foundation. Participants will source of leading research in porphyry Mo microfracture controlled and disseminated, depart for Grand Junction, Colorado, 5:30 deposits and development of exploration and (2) fracture zones containing high- PM, September 25, after the closing SEG...
Journal Article
Published: 01 March 2017
Environmental Geosciences (2017) 24 (1): 15–49.
.... In contrast, the contact with Lower–Middle Ordovician strata of the Knox and equivalent strata, including the Prairie du Chien Group, is considered conformable in the central parts of the Michigan Basin (see discussion in Catacosinos and Daniels, 1991 ; Barnes et al., 1996 ). On the basis...
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