Geology and geochemistry of the Klipberg alkali feldspar granite and associated hydrothermally altered rocks in the Darling batholith, southwestern Cape Province

Scheepers R. ; Schoch A.E. (1988)

Consecutive hydrothermal episodes altered parts of the two-mica Klipberg alkali feldspar granite to albitite and quartz episyenite. Various degrees of contamination by assimilation of country rock (biotite granite and granodiorite) are responsible for the development of mineralogically distinct quartz episyenites. Two episodes of K-metasomatism and albitization define distinct alteration trends reminiscent of the alteration trends in the Cornish and French Hercynean leucogranites. Trace element characteristics correspond with those of mineralized granitoids of alkaline series. Geochemical characteristics show correspondences with anorogenic alkaline, peralkaline, and A-type granites. The Rb-Zr and Y-contents of the alkali feldspar granite and hydrothermally altered rocks support a within-plate genetic model. -Authors

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