Composition of Pliocene to Quaternary mixed terrigenous and calcareous sandy beds in contourite drift deposits at ODP Site 1119 off New Zealand; insights into sandy drift development and drift petroleum reservoir characterization

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doi: 10.1016/j.marpetgeo.2016.01.006
Author(s): Marsaglia, Kathleen M.; Nolasco, Jasmyn M.
Author Affiliation(s): Primary:
California State University-Northridge, Department of Geological Sciences, Northridge, CA, United States
Volume Title: Marine and Petroleum Geology
Source: Marine and Petroleum Geology, Vol.72, p.98-109. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0264-8172
Note: In English. 40 refs.; illus., incl. sect., 2 tables, geol. sketch map
Summary: ODP (Ocean Drilling Program) Site 1119 was drilled in drift successions deposited by northward flowing currents on the Canterbury slope, South Island, New Zealand. Pliocene (∼3.9 Ma) to Pleistocene drift accumulation was concomitant with tectonic uplift and sediment supply from the Alpine Fault plate boundary to the west, glacial development and eustatic sealevel change that created cyclicity in sandy input. Sand detrital and biogenic modes of very fine and fine sand fractions from 24 unconsolidated core samples (44 thin sections) were determined. Fine sand fractions contain an average of 52% bioclastic debris, with bioclasts making up 23% of the very fine sand fraction. Foraminifers are the dominant bioclasts, with pelagic more common than benthic varieties. The average proportions of monocrystalline quartz, plagioclase and potassium feldspar are similar in both size fractions (average QmKP of ∼25:12:63). In contrast, the very fine sand fractions have, on average, higher lithic (QFL%L of 16 vs. 3%), mica (Totalgrain%M of 10 vs. 6%), and dense mineral (Totalgrain%D of 8 vs. 5%) content as compared with the fine sand fractions. Younger clinoform drape (Unit I) and older mounded drift (Unit II) seismic facies showed no distinct detrital compositional differences in their sand fractions, though bioclast content ranges higher in the fine sand fraction of Unit II. Albite feldspar, metamorphic rock fragment, and chlorite components in the sand are consistent with a schist provenance. Other components such as biotite, plagioclase, and K-feldspar require a contribution from metasedimentary and volcanic rocks. Thus there is some along-slope mixing during sediment transport by south-to-north flowing currents. Cemented microporous sandstone at the base of the section provides some insight into contourite burial diagenesis. This work provides a better understanding of the compositional variability of sand components of drift successions which are potential hydrocarbon reservoirs elsewhere. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 29 Economic Geology, Energy Sources; Australasia; Boreholes; Cenozoic; Clastic rocks; Contourite; Cores; Depositional environment; Foraminifera; Invertebrata; Leg 181; Lithostratigraphy; Marine sediments; Microfossils; Mineral composition; Neogene; New Zealand; ODP Site 1119; Ocean Drilling Program; Pacific Ocean; Petroleum; Petroleum exploration; Pleistocene; Pliocene; Protista; Provenance; Quaternary; Reservoir properties; Reservoir rocks; Sandstone; Sedimentary rocks; Sediments; South Island; South Pacific; Southwest Pacific; Terrigenous materials; Tertiary; West Pacific
Coordinates: S444520 S444520 E1722336 E1722336
Record ID: 2017044817
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands