The Coxco Deposit; a Proterozoic mississippi valley-type deposit in the McArthur River District, Northern Territory, Australia

Economic Geology (1983)

Richard N. Walker Brian L. Gulson John Ward Smith

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Abstract:

Strata-bound dolomite-hosted lead-zinc deposit. Crusts of colloform sphalerite, galena, pyrite, and marcasite (stage I mineralization) were deposited on the surfaces of the karst-produced solution cavities. Reduced sulfur was produced by sulfate-reducing bacteria within the karst system. A second stage of mineralization consisting of coarsely crystalline sphalerite, galena, pyrite, and marcasite occurs in veins and as the matrix for dolomite breccias.--Modified journal abstract.

Keywords:

River valley

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Paleontology and Stratigraphy of Fossils

Geological formations and processes

Geology and Paleoclimatology Research

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Lithos (2015)

Yeşim Yücel-Öztürk Cahit Helvacı Martin R. Palmer E. Yalçın Ersoy Nicolas Freslon

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Unreworked Archaean basement and Proterozoic supracrustal rocks from northeastern Disko Bugt, West Greenland: implications for the nature of Proterozoic mobile belts in Greenland

Canadian Journal of Earth Sciences (1988)

Feiko Kalsbeek Paul N. Taylor R. T. Pidgeon

Whole-rock Rb–Sr and Pb–Pb and zircon U–Pb isotope data yield an age of approximately 2800 Ma for the Atâ granite from northeastern Disko Bugt, West Greenland. Field observations and isotope data suggest that the surrounding gneisses were formed by deformation and recrystallization of granitoid rocks similar to the Atâ granite some 100 Ma after the emplacement of the granite. Rb–Sr whole-rock data on siltstones at low metamorphic grade give an age of 1760 ± 185 Ma, which is interpreted as the time of closure of the isotope systems after metamorphism. The initial 87 Sr/ 86 Sr ratio demonstrates that the sediments were probably deposited during the early Proterozoic.Field observations and isotope data show that Proterozoic (Hudsonian s.l.) deformation and metamorphism were weak in the investigated area. The Archaean basement is well preserved, and the metasediments have well-preserved sedimentary structures. The area lies between the Proterozoic Nagssugtoqidian and Rinkian mobile belts of West Greenland, which are thus separated by an area of Archaean rocks little affected by mid-Proterozoic tectono-thermal events. Thus the two belts form separate tectonic units and do not constitute a single contiguous vast area of Archaean rocks reworked by Proterozoic deforma-tion and metamorphism. It is suggested that the Proterozoic mobile belts of West Greenland are orogenic zones of restricted width (a few hundreds of kilometres) that may be interpreted in terms of modern plate tectonic processes.

Basement

Baltic Shield

10.1139/e88-072

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New Constraints on the Proterozoic Crustal Evolution of the Eastern Ghats Belt, India

Gondwana Research (2001)

Christoph Dobmeier Ralf Simmat M. Raith

10.1016/s1342-937x(05)70412-3

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Thrust zones and shear zones of the margin of the Namaqua and Kheis mobile belts, southern Africa