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Published in:
2005 | OriginalPaper | Chapter
Geological and geochemical characteristis of the Changba and Dengjiashan Pb-Zn deposits in the Qinling orogenic belt, China
Authors : Guoliang MA, Georges Beaudoin
Published in: Mineral Deposit Research: Meeting the Global Challenge
Publisher: Springer Berlin Heidelberg
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The Changba and Dengjiashan deposits are characterized by stratiform and lenticular orebodies with bedded and laminated structures. The major minerals are sphalerite, pyrite, galena, quartz, calcite, ankerite and barite. They are rich in
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S and Eu, depleted in Ce, and show a Pb isotope signature between the Upper Crust and Mantle reservoirs. The world-class Changba deposit is hosted in Mid-Devonian Eifelian clastic rocks and limestone, underlain by a lens of sulfide-cemented breccia. The Dengjiashan deposit, however, is hosted in younger Givetian chert, with more breccia and vein type ores. It is concluded that the deposits formed as exhalative accumulationsi in Mid-Devonian sedimentary basins. The Changba deposit formed on a continental slope, whereas the Dengjiashan deposit formed in an organic bank environment.