scholarly journals Geologic map and coal stratigraphic framework of the Cedaredge area, Delta County, Colorado

1989 ◽  
Keyword(s):  
Stratigraphic Framework ◽  
Geologic Map

Stratigraphic framework of zinc–lead deposits in the northern Cordillera northeast of the Tintina Trench

1979 ◽  
Vol 16 (2) ◽  
pp. 380-385
Author(s):  
Graeme P. McLaren ◽  
Colin I. Godwin
Keyword(s):  
Sedimentary Rocks ◽  
Minor Element ◽  
Late Cambrian ◽  
Time Space ◽  
Stratigraphic Framework ◽  
Geologic Map ◽  
Carbonate Sequence ◽  
Space Projection ◽  
Host Rocks ◽  
Two Populations

Two major groups of sedimentary rocks hosting zinc–lead deposits in the northern Canadian Cordillera can be distinctly partitioned on the basis of depositional tectonics. A Proterozoic to Early Cambrian succession of carbonates and elastics is separated from a Late Cambrian to Devonian basinal shale and laterally equivalent platformal carbonate sequence by a regional erosional hiatus. This partitioning is emphasized by bimodal minor element distributions in carbonate-hosted sphalerite found throughout these rocks. Two populations of sphalerite, individually contained within the two major groups of host rocks, are separated by a unit that is relatively barren of mineralization. A regional geologic map, diagrammatic cross section, and time–space projection illustrate the stratigraphy, depositional tectonics, and location of sphalerite occurrences, and are presented as a framework for further research.

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