Ballhaus, C., Wirth, R., Fonseca, R. O. C., Blanchard, H., Proell, W., Bragagni, A., Nagel, T., Schreiber, A., Dittrich, S., Thome, V., Hezel, D. C., Below, R. and Cieszynski, H. (2017). Ultra-high pressure and ultra-reduced minerals in ophiolites may form by lightning strikes. Geochem. Perspect. Lett., 5. S. 42 - 47. PARIS CEDEX 05: EUROPEAN ASSOC GEOCHEMISTRY. ISSN 2410-3403

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Abstract

Since ultra-high pressure (UHP) minerals have been discovered in ophiolites from Tibet and the Polar Urals, it is speculated that the mantle sections of ophiolites may originate deep within the mantle. The UHP minerals are frequently found together with ultra-reduced silicides, carbides, and nitrides. Consequently, it is argued that the deep mantle, or at least domains within it, must be highly reduced, so reduced that practically all transition elements at depth are present in the metallic state. We find it problematic to rewrite the history of ophiolite complexes based on these observations and suggest we should search for alternative and more realistic modes of origin. Electric discharge experiments at >6000 K reported here show that the UHP and highly reduced phase assemblages may precipitate from plasmas. We argue that the mineral assemblages may originate by lightning strikes. As such, they may not record the origin and emplacement history of the mantle lithologies within which they occur.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Ballhaus, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wirth, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fonseca, R. O. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blanchard, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Proell, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bragagni, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nagel, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schreiber, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dittrich, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thome, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hezel, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Below, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cieszynski, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-243401
DOI: 10.7185/geochemlet.1744
Journal or Publication Title: Geochem. Perspect. Lett.
Volume: 5
Page Range: S. 42 - 47
Date: 2017
Publisher: EUROPEAN ASSOC GEOCHEMISTRY
Place of Publication: PARIS CEDEX 05
ISSN: 2410-3403
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
LUOBUSA OPHIOLITE; PODIFORM CHROMITITES; DIAMONDS; REDUCTION; ORIGIN; MANTLEMultiple languages
Geochemistry & GeophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/24340

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