P-T-fluid evolution in the Mahalapye Complex, Limpopo high-grade terrane, eastern Botswana

Kimi Hisada, L. L. Perchuk, T. V. Gerya, D. D. Van Reenen, B. K. Paya

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Metapelites, migmatites and granites from the c. 2 Ga Mahalapye Complex have been studied for determining the P-T-fluid influence on mineral assemblages and local equilibrium compositions in the rocks from the extreme southwestern part of the Central Zone of the Limpopo high-grade terrane in Botswana. It was found that fluid infiltration played a leading role in the formation of the rocks. This conclusion is based on both well-developed textures inferred to record metasomatic reactions, such as Bt ⇒ And + Qtz + (K2O) and Bt ± Qtz ⇒ Sil + Kfs + Ms ± Pl, and zonation of Ms Bt + Qtz And + Qtz and Grt Crd Pl Kfs + Qtz reflecting a perfect mobility (Korzhinskii terminology) of some chemical components. The conclusion is also supported by the results of a fluid inclusion study. CO2 and H2O (aH2Ofl = 0.6) are the major components of the fluid. The fluid has been trapped synchronously along the retrograde P-T path. The P-T path was derived using mineral thermobarometry and a combination of mineral thermometry and fluid inclusion density data. The Mahalapye Complex experienced low-pressure granulite facies metamorphism with a retrograde evolution from 770 °C and 5.5 kbar to 560 °C and 2 kbar, presumably at c. 2 Ga.

Original languageEnglish
Pages (from-to)313-334
Number of pages22
JournalJournal of Metamorphic Geology
Issue number5
Publication statusPublished - Jun 2005


  • Fluid inclusions
  • Fluid infiltration
  • Granulite-facies
  • Limpopo high-grade terrane
  • Metasomatism
  • Migmatization

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology


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