Geochemical characteristics of komatiite – thoeliite association in parts of Daltonganj, Palamau district, Jharkhand

In the southern and southwestern part of Daltonganj town, number of ultramafic intrusives (represented by komatiites) and mafic dykes (represented dominantly by amphibolites) are encountered. The komatiites exhibit typical spinifex texture whereas amphibolites retain imprints of igneous texture and chemistry. Chemically, amphibolites exhibit characteristically high Mg-thoeliitic nature. Spatial association of these two rock types suggest that they are genetically linked although they fall in two different geochemical fields. On the basis of various chemical variation diagrams it can be assumed that there is distinct geochemical hiatus between the two groups. High Mg- komatiites are followed by low K-thoeliites.