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Epigenetic, low-temperature, carbonate-hosted Pb-Zn-Cu-Ba-F-Sr deposits in México: A Mississippi Valley–type classification

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Jordi Tritlla
Jordi Tritlla
Programa de Geofluidos, Centro de Geociencias, Campus U.N.A.M.–Juriquilla, Universidad Nacional Autónoma de México (UNAM), Carr. Qro-SLP km 15,5, Santiago de Querétaro 76230, México
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Gilles Levresse
Gilles Levresse
Programa de Geofluidos, Centro de Geociencias, Campus U.N.A.M.–Juriquilla, Universidad Nacional Autónoma de México (UNAM), Carr. Qro-SLP km 15,5, Santiago de Querétaro 76230, México
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Rodolfo Corona-Esquivel
Rodolfo Corona-Esquivel
Museo de Geología–Instituto de Geología, Universidad Nacional Autónoma de México (UNAM), J. Torres Bodet No. 176, Col. Sta Maria de La Ribera, México D.F. 06400, México
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David A. Banks
David A. Banks
School of Earth and Environment, The University of Leeds, Leeds LS2 9JT, UK
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Hector Lamadrid
Hector Lamadrid
Posgrado en Ciencias de la Tierra–Programa de Geofluidos, Centro de Geociencias, Campus U.N.A.M.–Juriquilla, Universidad Nacional Autónoma de México (UNAM), Carr. Qro-SLP km 15,5, Santiago de Querétaro 76230, México
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Julien Bourdet
Julien Bourdet
UMR 7566 G2R-CREGU, Université H. Poincaré, B.P. 239 Vandoeuvrelès-Nancy 54506, France
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Porfirio Julio Pinto-Linares
Porfirio Julio Pinto-Linares
Instituto Potosino de Ciencia y Tecnología (IPICYT), Depto. Geología Económica, Camino a la Presa San José 2055, Col. Lomas 4 sección CP. 78216, San Luis Potosí, S.L.P. México
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Published:
January 01, 2007

The low-temperature epigenetic and stratabound Pb-Zn-Cu-Ba-F-Sr–bearing ore deposits enclosed within sedimentary columns historically have been major sources of metals. Exploration companies still find these deposits to be a profitable exploration target due to their simple mineralogy as well as the large tonnage that can present, always considering the mineral districts as a whole.

In northeastern México, several nonmagmatic, low-temperature Pb-Zn-F-Ba deposits have been systematically considered as magmatic-related (skarns, high-temperature replacement deposits, epithermal deposits, etc.). Recently, these deposits have been restudied and placed within a scenario of deep fluid circulation of basinal brines through the Mesozoic sedimentary series, enriched in Ba, F, and metals during fluid flow and water-rock interactions. These fluids gave rise to a series of strata-bound epigenetic ore deposits scattered throughout the whole Mesozoic carbonate platform and can be shown to be unrelated to any period of magmatism. There is no intense alteration to the host rocks. Commonly there is a close association with organic matter, either liquid hydrocarbons or bitumen; they have a very simple mineralogy of barite, celestine, fluorite, sphalerite, galena, and have low formation temperatures (90–105 °C) combined with variable salinities. These characteristics make these deposits similar to the Mississippi Valley–type deposits, possibly most similar to the Alpine-Appalachian subtype.

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GSA Special Papers

Geology of Me´xico: Celebrating the Centenary of the Geological Society of Me´xico

Susana A. Alaniz-Álvarez
Susana A. Alaniz-Álvarez
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Ángel F. Nieto-Samaniego
Ángel F. Nieto-Samaniego
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Geological Society of America
Volume
422
ISBN print:
9780813724225
Publication date:
January 01, 2007

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