Petrography and mineral compositions of eclogites from the Koidu Kimberlite Complex, Sierra Leone Article

Fung, AT, Haggerty, SE. (1995). Petrography and mineral compositions of eclogites from the Koidu Kimberlite Complex, Sierra Leone . JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 100(B10), 10.1029/95jb01573

cited authors

  • Fung, AT; Haggerty, SE

authors

abstract

  • Forty-one upper mantle eclogites from the Koidu Kimberlite Complex, Sierra Leone, were selected for detailed petrographic and chemical examination to bolster an earlier database with a view to the identification of protoliths and possible source regions of eclogite origin. On the basis of MgO contents in garnets, eclogites are divided into a high-MgO suite and a low-MgO suite. Most high-MgO eclogites equilibrated at 1080°C at 4.7 GPa to 1130°C at 5.2 GPa, whereas most low-MgO eclogites cluster at 880°C at 3.3 GPa to 930°C at 3.8 GPa. Estimated PT and depths of origin of the Koidu eclogites imply that high-MgO eclogites are asthenospheric, low-MgO eclogites are lithospheric, and both are likely products of plume activity. -from Authors

publication date

  • January 1, 1995

published in

Digital Object Identifier (DOI)

volume

  • 100

issue

  • B10