7 research outputs found
Geomorphic and hydrological controls on groundwater dolocrete formation in the semi‐arid Hamersley Basin, northwest Australia
No full textGeomorphic and hydrological controls on groundwater dolocrete formation in the semi‐arid Hamersley Basin, northwest Australia
No full textSuboxic Diagenesis In Banded Iron Formations
Full text linkPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/62881/1/309340a0.pd
Trace element contents and C-O isotope geochemistry of the different originated magnesite deposits in Lake District (Southwestern Anatolia), Turkey
No full textTextural, chemical, and isotopic effects of late-magmatic carbonatitic fluids in the carbonatite-syenite Tamazeght complex, High Atlas Mountains, Morocco
No full textCarbonatites of the Eocene Tamazeght complex, High Atlas Mountains,
Morocco, consist of calciocarbonatites (alvikite and sovite dykes) and
magnesiocarbonatites (diatreme breccias and dykes rocks). These are
associated with ultramafic, shonkinitic, gabbroic to monzonitic and
various foid syenitic silicate units. Stable and radiogenic isotope
compositions for carbonatites and silicate rocks indicate that they
share a common source in the mantle, although for some carbonatitic
samples contamination with sedimentary rocks seems important. The
observed isotopic heterogeneity is mainly attributed to source
characteristics, fractional crystallization (accompanied by various
degrees of assimilation), and late- to post-magmatic fluid-rock
interaction. During the late fluid-rock interaction, Sr, Mn, and
possibly also Fe were mobilized and redistributed to form secondary
carbonate minerals in carbonatites. These fluids also penetrated into
the adjacent syenitic rocks, causing enrichment in the same elements
