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A paleoenvironmental study of subsurface Quaternary sediments at Wainuiomata, Wellington, New Zealand, and tectonic implications

Journal Article:

Abstract

A stratigraphic drillhole (WS-1) sited on the floor of Wainuiomata Valley near Lower Hutt, revealed a 61.6 m thick Quaternary sequence overlying Torlesse Supergroup greywacke sandstone and argillite. The Quaternary sediments consist of three sequences separated by disconformities. The lower sequence, 10.7 m thick (61.6-50.9 m), consists of fluvial sediments of probable early Quaternary age. The middle sequence, about 48.3 m in thickness (50.9-c. 2.6 m), spans most of the Last Glaciation. Fluvial/overbnak (50.9-42.0 m), floodplain/swamp (42.9-34.5 m), and fluvial (34.5-31.3 m) sediments overlie the disconformity at 50.9 m. Conformably overlying these sediments are swamp and lacustrine deposits between 31.3 and 4.1 m. Diatoms and algal spores and coenobia show the existence of an extensive lake during much of this sequence, from 25.6 to 4.0 m. at the peak of its development, at a drillhole depth of c. 23 m, the lake was >10 m deep and had a high algal biomass. Kawakawa Tephra (22 600 yr b.p.) occurs near the top of the middle sequence at 4.1 m depth. The upper sequence, of Holocene-Recent age, is <2.6 m thick, including .06 m of fill. The existence of sediments of the lower sequence of at least Castlecliffian age (early Pleistocene)  More>>
Authors:
Begg, J G; Mildenhall, D C; Lyon, G L; Stephenson, W R; Funnell, R H; Van Dissen, R J; Bannister, S; Brown, L J; [1]  Pillans, B; Harper, M A; [2]  Whitton, J [3] 
  1. Institute of Geological and Nuclear Sciences Ltd., Lower Hutt (New Zealand)
  2. Research School of Earth Sciences, Victoria University of Wellington, Wellington (New Zealand)
  3. Manaaki Whenua - Landcare Research, Lower Hutt, (New Zealand)
Publication Date:
Dec 31, 1993
Product Type:
Journal Article
Reference Number:
SCA: 540211; 400102; PA: AIX-27:065117; EDB-96:145303; SN: 96001665520
Resource Relation:
Journal Name: New Zealand Journal of Geology and Geophysics; Journal Volume: 36; Other Information: DN: Also known as Institute of Geological and Nuclear Sciences contribution; 251.; PBD: 1993
Subject:
54 ENVIRONMENTAL SCIENCES; 40 CHEMISTRY; NEW ZEALAND; ISOTOPE APPLICATIONS; TECTONICS; CARBON ISOTOPES; QUATERNARY PERIOD; SEDIMENTS; STRATIGRAPHY
OSTI ID:
371219
Country of Origin:
New Zealand
Language:
English
Other Identifying Numbers:
Journal ID: NEZOAY; ISSN 0028-8306; TRN: NZ9600066065117
Submitting Site:
INIS
Size:
pp. 461-473
Announcement Date:

Journal Article:

Citation Formats

Begg, J G, Mildenhall, D C, Lyon, G L, Stephenson, W R, Funnell, R H, Van Dissen, R J, Bannister, S, Brown, L J, Pillans, B, Harper, M A, and Whitton, J. A paleoenvironmental study of subsurface Quaternary sediments at Wainuiomata, Wellington, New Zealand, and tectonic implications. New Zealand: N. p., 1993. Web.
Begg, J G, Mildenhall, D C, Lyon, G L, Stephenson, W R, Funnell, R H, Van Dissen, R J, Bannister, S, Brown, L J, Pillans, B, Harper, M A, & Whitton, J. A paleoenvironmental study of subsurface Quaternary sediments at Wainuiomata, Wellington, New Zealand, and tectonic implications. New Zealand.
Begg, J G, Mildenhall, D C, Lyon, G L, Stephenson, W R, Funnell, R H, Van Dissen, R J, Bannister, S, Brown, L J, Pillans, B, Harper, M A, and Whitton, J. 1993. "A paleoenvironmental study of subsurface Quaternary sediments at Wainuiomata, Wellington, New Zealand, and tectonic implications." New Zealand.
@misc{etde_371219,
title = {A paleoenvironmental study of subsurface Quaternary sediments at Wainuiomata, Wellington, New Zealand, and tectonic implications}
author = {Begg, J G, Mildenhall, D C, Lyon, G L, Stephenson, W R, Funnell, R H, Van Dissen, R J, Bannister, S, Brown, L J, Pillans, B, Harper, M A, and Whitton, J}
abstractNote = {A stratigraphic drillhole (WS-1) sited on the floor of Wainuiomata Valley near Lower Hutt, revealed a 61.6 m thick Quaternary sequence overlying Torlesse Supergroup greywacke sandstone and argillite. The Quaternary sediments consist of three sequences separated by disconformities. The lower sequence, 10.7 m thick (61.6-50.9 m), consists of fluvial sediments of probable early Quaternary age. The middle sequence, about 48.3 m in thickness (50.9-c. 2.6 m), spans most of the Last Glaciation. Fluvial/overbnak (50.9-42.0 m), floodplain/swamp (42.9-34.5 m), and fluvial (34.5-31.3 m) sediments overlie the disconformity at 50.9 m. Conformably overlying these sediments are swamp and lacustrine deposits between 31.3 and 4.1 m. Diatoms and algal spores and coenobia show the existence of an extensive lake during much of this sequence, from 25.6 to 4.0 m. at the peak of its development, at a drillhole depth of c. 23 m, the lake was >10 m deep and had a high algal biomass. Kawakawa Tephra (22 600 yr b.p.) occurs near the top of the middle sequence at 4.1 m depth. The upper sequence, of Holocene-Recent age, is <2.6 m thick, including .06 m of fill. The existence of sediments of the lower sequence of at least Castlecliffian age (early Pleistocene) uncomformably overlying basement greywacke provides a minimum age for the K-surface in the area. The Last Glacial sediments show evidence of ponfing, which may be a result of one factor or a more of the following: ponding behind an aggradational terrace of the Wainuiomata River; landslide blockage of the Black Stream drainage near its confluence with Wainuiomata River; and tectonic deformation. Progressive tectonic deformation since the start of the Last Glaciation is considered the most likely dominant factor. This has resulted in the elevation of greywacke basement near the junction of Black Stream and Wainuiomata River. The nature of the deformation - faulting, tilting, and/or folding - has not been established. 38 refs,6 figs,2 tables.}
journal = {New Zealand Journal of Geology and Geophysics}
volume = {36}
journal type = {AC}
place = {New Zealand}
year = {1993}
month = {Dec}
}