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Clay Minerals; March 2007; v. 42; no. 1; p. 21-43; DOI: 10.1180/claymin.2007.042.1.03
© 2007 Mineralogical Society of Great Britain and Ireland
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Newly formed phyllosilicates in rock matrices and fractures from CRP-3 core (Antarctica): an electron microscopy study

G. GIORGETTI1,*, F. S. AGHIB2, K. J. T. LIVI3, A.-C. GAILLOT3 and T. J. WILSON4

1 Dipartimento di Scienze della Terra, Universitàdi Siena, Italy, 2 CNR-Istituto per le Dinamiche dei Processi Ambientali, Milano, Italy, 3 Department of Earth and Planetary Sciences, The John Hopkins University, Baltimore, USA, and 4 Department of Geological Sciences, Ohio State University, USA

* E-mail: giorgettig{at}unisi.it

(Received 5 September 2005; revised 12 October 2006)

A scanning and transmission electron microscopy study has been performed on Oligocene glacio-marine sediments, Devonian sandstones, and Jurassic dolerites recovered during CRP-3 drilling in the Ross Sea (Antarctica). Newly formed clay minerals occur in the rock matrices and as fillings in veins and faults which crosscut the whole sequence. Authigenic clays in sediments consist of beidellite-montmorillonite, berthierine/chlorite intergrowths and illite. Al,K-rich smectites and kaolinite occur in the Devonian sandstones. Saponite, berthierine/chlorite intergrowths, and Fe-hydroxides develop in the altered dolerites. Hence, the composition of the secondary phases depends also on the geochemistry of the rock they grow in. Within each sample, the same authigenic minerals form in the matrix and in the vein/fault. Clays precipitated from fluids, with variable fO2 values, which circulated in the system during the contemporaneous diagenetic and faulting events.

KEYWORDS: Ross Sea, CRP-3 core, authigenic phyllosilicates, chlorite, illite, smectite, SEM, TEM, EELS




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 Clay MineralsHome page
M. Setti, L. Marinoni, and A. Lopez-Galindo
Clay mineral assemblages as indicators of hydrothermalism in the basal part of the CRP-3 core (Victoria Land Basin, Antarctica)
Clay Minerals, September 1, 2009; 44(3): 389 - 404.
[Abstract] [Full Text] [PDF]


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