Hydrous and carbonatitic mantle fluids in fibrous diamonds from Jwaneng, Botswana

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doi: 10.1016/0016-7037(94)90504-5
Authors:Schrauder, Marcus; Navon, Oded
Author Affiliations:Primary:
Hebrew University, Institute of Earth Sciences, Jerusalem, Israel
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 58(2), p.761-771. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1994
Note:In English. 71 refs.; illus. incl. 1 table
Summary:Fluid inclusions trapped in fibrous diamonds and coatings of octahedral diamonds sampled upper mantle fluids. The composition of the major oxides, volatile speciation and secondary phases of mantle fluids trapped in 13 diamonds are reported. The fluids range between two end-members -- a carbonatitic fluid rich in carbonate, CaO, FeO, MgO and P2O5, and a hydrous fluid rich in H2O, SiO2 and Al2O3. K2O is high in both end-members; Mg/(Mg+Fe) in the fluids is low and decreases to the hydrous end-member. Models of formation and evolution of fluids in the mantle are: mixing of hydrous and carbonatitic fluids, partial melting of a carbonate source-rock and fractional crystallization. [R.K.H.]
Subjects:Carbonatites; Diamond; Fluid inclusions; Igneous rocks; Inclusions; Mantle; Metasomatism; Native elements; Peridotites; Plutonic rocks; Ultramafics; Africa; Botswana; Southern Africa; Jwangeng Botswana
Abstract Numbers:94M/3275
Record ID:1994048830
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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