Abundance and distribution of boron in the Hauzenberg (Bavaria) granite complex
- Institut fuer Mineralogie und Petrographie der Universitaet Muenchen (Germany, F.R.)
Hercynian S-type granites from the Hauzenberg igneous complex show a range of boron concentration from 1 to 12 ppm. The whole-rock boron data are not significantly correlated with concentrations of other trace elements (Zr, Rb, Ba, Sr, Ni, V, Co, Cu, Zn, F); neither is boron correlated with the major elements (except with sodium) or with the differentiation index (DI). The boron budget in the rock-forming minerals (plagioclase, alkali feldspar, quartz, biotite, muscovite) of the tourmaline-free granites reveals that the highest concentrations of boron occur in muscovite, whereas the greatest amount of boron is incorporated in plagioclase (57-69%) due to its high modal amount. Boron in plagioclase increases with the extent of of sericitization (obtained by X-ray diffractometry). Muscovite in a pegmatite contains more than 50% of the total boron. The areal distribution of boron within the complex is neither uniform nor random; an increase of boron concentrations from granodioritic to granitic rocks is indicated, whereas the late differentiates are depleted in boron.
- OSTI ID:
- 6692369
- Journal Information:
- Geochimica et Cosmochimica Acta; (USA), Vol. 54:1; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON
CONCENTRATION RATIO
GRANITES
MINERALOGY
PETROCHEMISTRY
CHEMICAL COMPOSITION
ELEMENT ABUNDANCE
FEDERAL REPUBLIC OF GERMANY
TRACE AMOUNTS
X-RAY DIFFRACTION
ABUNDANCE
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
EUROPE
IGNEOUS ROCKS
PLUTONIC ROCKS
ROCKS
SCATTERING
SEMIMETALS
WESTERN EUROPE
580000* - Geosciences