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Mineralogical Magazine; August 2004; v. 68; no. 4; p. 579-589; DOI: 10.1180/0026461046840213
© 2004 Mineralogical Society of Great Britain and Ireland
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Carbonate nodules of probable stromatolitic origin in amphibolite from the Neoproterozoic terrain of southern Israel

R. Bogoch* and M. Shirav (Schwartz)

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 {delta}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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Reviews in Mineralogy and Geochemistry, October 1, 2007; 67(1): 359 - 416.
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