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GEOREF RECORD

Djerfisherite in xenoliths of sheared peridotite in the Udachnaya-East Pipe (Yakutia); origin and relationship with kimberlitic magmatism

I. S. Sharygin, A. V. Golovin and N. P. Pokhilenko
Djerfisherite in xenoliths of sheared peridotite in the Udachnaya-East Pipe (Yakutia); origin and relationship with kimberlitic magmatism
Russian Geology and Geophysics (March 2012) 53 (3): 247-261

Abstract

Djerfisherite, a Cl-bearing potassium sulfide (K (sub 6) Na(Fe,Ni,Cu) (sub 24) S (sub 26) Cl), is a widespread accessory mineral in kimberlite-hosted mantle xenoliths. Nevertheless, the origin of this sulfide in nodules remains disputable. It is usually attributed to the replacement of primary Fe-Ni-Cu sulfides when xenoliths interact with a K-and Cl-enriched hypothetical melt/fluid. The paper is devoted to a detailed study of the composition and morphology of djerfisherite from a representative collection (22 samples) of the deepest mantle xenoliths-sheared garnet peridotite, taken from the Udachnaya-East kimberlite pipe (Yakutia). Four types of djerfisherite were distinguished in the mantle rocks on the basis of morphology, spatial distribution, and relationships with the rock-forming and accessory minerals in the nodules. Type 1 was found in the rims of polysulfide inclusions in the rock-forming minerals of the xenoliths; there, it was younger than the primary sulfide assemblage pyrrhotite + pentlandite + or - chalcopyrite. Type 2 formed rims around large polysulfide segregations (pyrrhotite+ pentlandite) in the xenolith interstices. Type 3 formed individual grains in the xenolith interstices together with other sulfides, silicates, oxides, phosphates, and carbonates. Type 4 was present as a daughter phase in the secondary melt inclusions which occurred in healed cracks in the rock-forming minerals of the xenoliths. Along with djerfisherite, the inclusions contained silicates, oxides, phosphates, carbonates, alkaline sulfates, chlorides, and sulfides. The results indicate that djerfisherite from the xenoliths is consanguine with kimberlite. Djerfisherite both in the sheared-peridotite xenoliths from the Udachnaya-East pipe and in different xenoliths from other kimberlite pipes worldwide formed owing to the interaction between the nodules and kimberlitic melts. Djerfisherite forming individual grains in the melt inclusions and xenolith interstices crystallized directly from the infiltrating kimberlitic melt. Djerfisherite bounding the primary Fe-Ni + or - Cu sulfides formed by their replacement as a result of a reaction with the kimberlitic melt.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 53
Serial Issue: 3
Title: Djerfisherite in xenoliths of sheared peridotite in the Udachnaya-East Pipe (Yakutia); origin and relationship with kimberlitic magmatism
Affiliation: Russian Academy of Sciences, V. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 247-261
Published: 201203
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 90
Accession Number: 2021-044942
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, sketch map
N66°25'60" - N66°25'60", E112°19'00" - E112°19'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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