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Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel
* E-mail: ron.bogoch{at}gsi.gov.il
Several small bodies of massive to banded amphibolite occur within plagioclase-quartz-biotite hornblende gneiss at or close to its boundary with a quartz diorite pluton in the Neoproterozoic terrain of southern Israel. Entrapped within the amphibolite are nodules consisting mainly of calcite+talc, and rare banded marble. Remnant laminae and certain geochemical features such as the negative Ce anomaly and depleted
13C of the nodules sugggest that they initially formed as stromatolites. The local geological setting of the amphibolites together with the presence of the enclosed meta-carbonates favoured an origin as sediments, although some of the geochemical data point to a basaltic precursor and some of the carbonates have a puzzlingly high (>1000 ppm) Ni content. The origin of the amphibolites is thus enigmatic.
KEYWORDS: amphibolite, stromatolite, Neoproterozoic, Arabo-Nubian Shield, Israel
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J. C. Schumacher Metamorphic Amphiboles: Composition and Coexistence Reviews in Mineralogy and Geochemistry, October 1, 2007; 67(1): 359 - 416. [Full Text] [PDF] |
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