New Zealand Journal of Marine and Freshwater Research abstracts

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ALGAL STABILISATION OF HOLOCENE CONGLOMERATES BY MICRITIC HIGH-MAGNESIUM CALCITE, SOUTHERN NEW CALEDONIA

Campbell S. Nelson
K. A. Rodgers

Geology Department, University of Auckland

Abstract Conglomerates in the intertidal zone of the southern New Caledonian lagoon consist of phenoclasts of peridotite, ferrallite and skeletal fragments set in a matrix of biocalcirudite, and bound together by micritic crusts of high-Mg calcite and/or fringes of aragonite spar. During a + 0.3 m stillstand about 1600 B.P. material reworked into the midlittoral and sublittoral zones from former terrace deposits became encrusted and stabilised by autochthonous micrite deposited by calcareous algae. The subsequent drop in sea level to its present position caused degradation and further induration of the outcrop surfaces by microspar formation and impregnation with allochthonous micrite.

N.Z. Jl mar. Freshwat. Res. 3: 395-408
(Received for publication 21 October 1968)

PDF file of entire paper: medium quality (3315K); (scanned from paper original: notes about this process)

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