Mineralium Deposita

, Volume 38, Issue 6, pp 652–667 | Cite as

Tectonic controls of Mississippi Valley-type lead–zinc mineralization in orogenic forelands

  • Dwight C. BradleyEmail author
  • David L. Leach


Most of the world's Mississippi Valley-type (MVT) zinc–lead deposits occur in orogenic forelands. We examine tectonic aspects of foreland evolution as part of a broader study of why some forelands are rich in MVT deposits, whereas others are barren. The type of orogenic foreland (collisional versus Andean-type versus inversion-type) is not a first-order control, because each has MVT deposits (e.g., Northern Arkansas, Pine Point, and Cevennes, respectively). In some MVT districts (e.g., Tri-State and Central Tennessee), mineralization took place atop an orogenic forebulge, a low-amplitude (a few hundred meters), long-wavelength (100–200 km) swell formed by vertical loading of the foreland plate. In the foreland of the active Banda Arc collision zone, a discontinuous forebulge reveals some of the physiographic and geologic complexities of the forebulge environment, and the importance of sea level in determining whether or not a forebulge will emerge and thus be subject to erosion. In addition to those on extant forebulges, some MVT deposits occur immediately below unconformities that originated at a forebulge, only to be subsequently carried toward the orogen by the plate-tectonic conveyor (e.g., Daniel's Harbour and East Tennessee). Likewise, some deposits are located along syn-collisional, flexure-induced normal and strike-slip faults in collisional forelands (e.g., Northern Arkansas, Daniel's Harbour, and Tri-State districts). These findings reveal the importance of lithospheric flexure, and suggest a conceptual tectonic model that accounts for an important subset of MVT deposits—those in the forelands of collisional orogens. The MVT deposits occur both in flat-lying and in thrust-faulted strata; in the latter group, mineralization postdated thrusting in some instances (e.g., Picos de Europa) but may have predated thrusting in other cases (e.g., East Tennessee).


Mississippi Valley-type deposit Foreland basin Collisional orogeny Forebulge Flexural extension 



We thank Grant Garven, Gerry Stanley, Alex Brown, Rich Goldfarb, and Tim White for reviewing the manuscript. Collaborations with Don Sangster, Mike Lewchuk, David Symons, Henri Rouvier, and Jean-Claude Macquar have greatly influenced us over the years. Rod Randell, Tom Lane, and Antonio Alonso kindly led us through the Polaris, Daniel's Harbour, and Reocin deposits, respectively.


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© Springer-Verlag 2003

Authors and Affiliations

  1. 1.US Geological SurveyAnchorageUSA
  2. 2.US Geological Survey, MS 973Denver Federal CenterLakewoodUSA

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