Details

Autor(en) / Beteiligte

• González-Jiménez, José M.
• Sergeeva, Ivanina
• Kerestedjian, Thomas N.
• Gervilla, Fernando

Titel

Subducted iron and glassy spherules in the upper mantle?

Ist Teil von

• Boletín de la Sociedad Geológica Mexicana, 2022-01, Vol.74 (3), p.A200722

Ort / Verlag

Sociedad Geológica Mexicana A.C

Erscheinungsjahr

2022

Quelle

Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals

Beschreibungen/Notizen

• Spherules are documented in ophiolitic mantle rocks such as peridotites and associated chromitites. They consist of: (1) native iron having variable amounts of Ni with/without inclusions of silicate glass or oxides (wüstite), (2) dendritic intergrowth of oxides (magnetite, wüstite and hematite) with/without silicate glass and, (3) silicate glass. Consensually, they are interpreted as indigenous to chromitites and related with high-temperature processes operating in the Earth’s upper mantle. However, their similarity with terrestrial and extraterrestrial spherules found in other settings of the geological record is remarkable. We raise the question on such indigenous origin, relating them to volcanic and cosmic material recycled back to the mantle wedge where chromitites form during subduction.