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On the formation of magnetite-hematite-apatite "magmas" from metalliferous sediments at subduction zones
Luleå tekniska universitet.
1982 (English)In: Stockholm Contributions in Geology, ISSN 0585-3532, no 37, p. 21-42Article in journal (Refereed) Published
Abstract [en]

One interpretation of the plate tectonic theory suggests that marine sediments are brought down to large depths in the Earth and become intensely metamorphosed at subduction zones. A considerable fraction of these subducted sediments would consist of Fe, Mn and P rich exhalative-sedimentary deposits that have formed at spreading centers. A thermodynamic model for such alteration processes shows that exhalative sedimentary deposits would serve as source beds for magmatic magnetite-hematite-apatite rich ores whereas Mn would be lost due to reduction by organic matter, and subsequent removal in acid solutions, formed from interactions between clays and NaCl in pore waters. The alteration products show several similarities with the many magnetite-hematite-apatite ores which are located in the circumpacific orogenic belt

Place, publisher, year, edition, pages
1982. no 37, p. 21-42
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-5880Local ID: 412009e0-0a7e-11df-bae5-000ea68e967bOAI: oai:DiVA.org:ltu-5880DiVA, id: diva2:978756
Note
Godkänd; 1982; 20100126 (andbra)Available from: 2016-09-29 Created: 2016-09-29Bibliographically approved

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