Contemporary benthic foraminifera in Gulf St Vincent, South Australia, and a refined Late Pleistocene sea‐level history
作者:
J. H. Cann,
A. P. Belperio,
V. A. Gostin,
R. L. Rice,
期刊:
Australian Journal of Earth Sciences
(Taylor Available online 1993)
卷期:
Volume 40,
issue 2
页码: 197-211
ISSN:0812-0099
年代: 1993
DOI:10.1080/08120099308728074
出版商: Taylor & Francis Group
关键词: foraminifera;Holocene;Late Pleistocene sea‐levels;oxygen isotope stage 3;palaeogeography;radiocarbon;sedimentology;South Australia
数据来源: Taylor
摘要:
Benthic foraminifera are abundant in surficial sediment of Gulf St Vincent and the distribution of many species is related to water depth. For example,Nubecularia lucifugais most abundant in shallow northern waters whileAmmobaculites reophaciformisis more common in deeper southern parts of the gulf.Elphidium crispum,a shallow‐water species, andE. macelliforme,favouring deeper water, provide a useful numerical ratio. Their logarithmic relative abundance in the sediment size fraction 0.50–0.25 mm correlates closely with water depth, particularly for southern Gulf St Vincent. Vibrocore SV23 recovered an undisturbed section of Quaternary strata from one of the deepest parts (40 m) of the gulf. Late Pleistocene sediment (oxygen isotope stage 3) was in turn overlain by rapidly deposited lacustrine and restricted marginal marine sediment before development of more open Holocene marine conditions. Using theElphidiumratios and other supporting foraminiferal data on a framework of14C dates, a palaeosea‐level curve was calculated from SV23. Changes in sea‐level so derived for the period 45–30 ka bp agree closely with those previously calculated for Gulf St Vincent and can be correlated with those determined from studies of Huon Peninsula coral reef terraces. For this time‐interval, southern Australian palaeosea‐levels of ‐30 to ‐27 m are indicated from the work reported here.
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