Petrological and geochemical signatures of carbonatites from Hogenakkal, Dharmapuri District, Tamil Nadu
Author(s):
M Vittal, S amarendhar, K Rajendraprasad, K Sreenu, M Srinivas
Keywords:
Cabonatite, Eu anamoly, REE, Palaeoproterozoic, Hogenakkal
Abstract
The Hogenakkal carbonatites are found as discontinuous bodies within two pyroxenite dykes, forming veins and lenses within the pyroxenite. Through field observations, it's deduced that the sequence of their formation follows the pyroxenite first, then syenite, and finally carbonatites. These carbonatite complexes, dating back to the Neoproterozoic era, are set within the Archaean granulites. Additionally, smaller Paleoproterozoic (2.4 billion years old) carbonatite intrusions exist within two northeast-trending pyroxenite dikes. These carbonatite samples exhibit distinctive characteristics, including low levels of SiO2, FeO, and MgO, while featuring relatively high concentrations of CaO. This sets them apart from other types of carbonatites. Within the Hogenakkal carbonatites, there are variations such as sövite, distinguished by their elevated Sr and Ba contents and remarkable enrichment in light rare earth elements (LREE), showcasing steep slopes typical of carbonatites. Analyzing the chondrite-normalized Rare Earth Elements (REE) of these carbonatites reveals a slight abundance in LREE compared to Heavy Rare Earth Elements (HREE), with no negative spikes for Eu. This suggests a potential metasomatised source or the influence of garnet in the source material. The findings of this study shed significant light on the field, petrography, and geochemistry of the Hogenakkal alkaline carbonatite complex.
Article Details
Unique Paper ID: 164134

Publication Volume & Issue: Volume 10, Issue 12

Page(s): 304 - 312
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