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- W1991880341 abstract "Abstract Detailed magnetostratigraphic studies of Late Neogene siliciclastic sediments of the Awatere Group, South Island, New Zealand (41°45′S, 174°05′E) have revealed a wide range of palaeomagnetic behaviour. Examination of rock magnetic properties was undertaken using conventional palaeomagnetic techniques and thermomagnetic, X-ray diffraction and electron microprobe analyses. These analyses indicate that the ferrimagnetic iron sulphide minerals, greigite and pyrrhotite, are responsible for a stable and intense magnetic remanence in fine-grained sediments, whereas titanomagnetite is the only remanence-bearing mineral identified in coarser-grained sediments, which are less strongly and less stably magnetised than the fine-grained sediments. Detrital titanomagnetite grains are likely to have undergone dissolution during early diagenesis as a result of iron sulphide formation, which occurs commonly in rapidly deposited, anoxic sediments that support active sulphate reduction and H 2 S formation. Preservation of greigite and pyrrhotite is inferred to result from the arrest of the pyritisation process, probably due to the low permeability of the fine-grained sediments and consumption of available H 2 S before full reaction to pyrite occurred. Relative palaeomagnetic instability and weak remanence intensities in coarser grained sediments is likely to be due to low titanomagnetite concentrations resulting from titanomagnetite dissolution." @default.
- W1991880341 created "2016-06-24" @default.
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- W1991880341 date "1993-03-01" @default.
- W1991880341 modified "2023-10-18" @default.
- W1991880341 title "Diagenetic formation of ferrimagnetic iron sulphide minerals in rapidly deposited marine sediments, South Island, New Zealand" @default.
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- W1991880341 doi "https://doi.org/10.1016/0012-821x(93)90226-y" @default.
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