The document discusses sedimentary mineral deposits, including their formation processes such as weathering and sedimentation. It highlights various types of deposits like placer and laterite deposits, and outlines the features of banded iron formations (BIFs) in Egypt. Additionally, it examines the economic significance of these deposits in different geological settings.

1. LECTURE 7:
SEDIMENTARY MINERAL DEPOSITS
Prof. Dr. Hassan Z. Harraz
Geology Department, Faculty of Science, Tanta University
hharraz2006@yahoo.com
Spring 2020
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4. The Sedimentary Cycle
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5. “Ore genesis processes”
Formation of Mineral Deposits
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7. II) Exogenous (Surficial) processes: (solar, external heat driven largely)
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8. 1) Deposits formed by Weathering methods
Mechanical
Weathering
Chemical
Weatheri
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9. Residual Concentration by Mechanical Weathering
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10. Concentration of heavy minerals in placer deposits

11. Placer deposits occur in any area where current velocity is low, such as;
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12. ❑Residual (eluvial or laterite) Mineral Deposits :

13. Definition of Laterites

14. Secondary enrichment process
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❑Supergene Secondary Enrichment Deposits:

15. Zoning of Secondary enrichment process

17. Mineral Deposits and Geologic Processes
Mineral deposits may be found in a variety of plate tectonic settings.
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18. II) Exogenous (Surficial) processes
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20. Mineral Deposits formed as Depositional (Sedimentation) Methods
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21. Manganese Nodules
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Main features of Egyptian BIFs: (a) Macro- and meso- scale banding in one of
the least altered BIF samples from Gebel Semna (altered BIF). (b) Meso- and
(c) micro-scale banding (lamination) between alternating jasper (red)

24. Classification of
BIFs
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according to facies:
(Mineralogy of BIFs)
according to geologic
setting: Three main types of
banded iron formations are recorded
allover the world :

25. 3) Deposits formed by Evaporation Methods
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26. Resources from the Sedimentary Environments
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27. Economic mineral deposits that formed in arid and tropical/subtropical environments
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28. Deposits Formed by weathering and Sedimentation Processes
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29. Different weathering methods lead to form economic
mineral deposits
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30. Follow me on Social Media
http://facebook.com/hzharraz
http://www.slideshare.net/hzharraz
https://www.linkedin.com/in/hassan-harraz-3172b235
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