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- aggregation classification "A1".
- aggregation creator B607895.
- aggregation creator B607896.
- aggregation creator B607897.
- aggregation creator person.
- aggregation date "2012".
- aggregation format "application/pdf".
- aggregation hasFormat 2125933.bibtex.
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- aggregation isPartOf urn:issn:0883-1351.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Earth and Environmental Sciences".
- aggregation title "Preservation of giant anomalocaridids in silica-chlorite concretions from the Early Ordovician of Morocco".
- aggregation abstract "The recently discovered Fezouata Biota, from the early Ordovician (late Tremadocian to late Floian) of Morocco preserves a diverse soft-bodied fauna. While preservation is mostly of Burgess Shale-type, giant anomalocaridids also occur in siliceous concretions. A petrographic and geochemical analysis of these concretions reveals their growth history and the circumstances that led to the fossilization of non biomineralized anatomy within them. The large (>1m) concretions are homogeneous in composition and geochemical characteristics, indicating rapid pervasive growth of mineral frameworks during decay of the large animals at or near the sediment-water interface. Concretions are comprised of ultra-fine grained (2-20μ) authigenic quartz, Fe-chlorite, and calcite, a composition unlike other known marine concretions. Abundant pyrite, now represented by oxide pseudomorphs, grew adjacent to the anomalocaridid carcasses, but rarely within the matrix of the concretions. This distribution indicates that sulfate reduction around the carcasses was vigorous within otherwise organic-poor sediments resulting in the establishment of prominent chemical gradients around the giant anomalocaridids that led to early precipitation of mineral overgrowths around non-biomineralized tissues. Rapid precipitation of intergrown silica and Fe-chlorite required an abundant source of silica, iron, and aluminum. These ions were most probably derived from dissolution of volcanic ash in the sediments. Limited intergrown calcite (δ13C avg. -12.2‰, n=23) precipitated from bicarbonate generated largely by sulfate reduction of organic tissues of the carcasses. Whereas Burgess Shale-type preservation of fossils in the Fezouata biota required suppression of degradation, exceptional preservation of anomalocaridids within the siliceous concretions resulted from extensive microbial decomposition of a large volume of organic tissues. Rapid mineralization was facilitated by localization of microbial activity around the large carcasses and must have required an unusually reactive sediment composition.".
- aggregation authorList BK966319.
- aggregation endPage "325".
- aggregation issue "5".
- aggregation startPage "317".
- aggregation volume "27".
- aggregation aggregates 2133652.
- aggregation isDescribedBy 2125933.
- aggregation similarTo palo.2011.p11-093r.
- aggregation similarTo LU-2125933.