Thermoluminescent dating of Lake Mungo geomagnetic polarity excursion

Huxtable, J.; Aitken, M. J.

doi:10.1038/265040a0

Cited by 43 publications

(19 citation statements)

References 9 publications

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“…At Lake Mungo in western New South Wales, site of Australia's oldest human remains, both comparative and non-comparative results are informative (Bowler et al 2003). Good correlation existed between 14 C dates of charcoal and TL dates of sediment spanning the Lake Mungo geomagnetic excursion (Barbetti and McElhinny 1972;Huxtable and Aitken 1977;Bell 1994). However, 14 C estimates for the Mungo I cremation site are approximately 15 to 20 ka younger than those provided by OSL dating (Bowler et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

2004

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Radiocarbon age determinations and stratigraphy suggest that the deposits in Black Creek Swamp on Kangaroo Island record 3 phases of deposition and associated soil development which spanned at least the last 20,000 yr. Four new 14C age determinations on bulk soil organic matter and their stratigraphic context are presented in this paper. Three of these age determinations (FP6: 15,687 ± 110 BP [WK11487]; FP7: 16,326 ± 385 BP [WK11488]; and FP8: 17,618 ± 447 BP [WK11489]), are from the organic-rich fossil layer located 45–75 cm below the current floodplain surface. The fourth, a much younger date, FP5: 5589 ± 259 BP (WK11486), was obtained from the base of the overlying modern soil. The dates for the fossil layer increase systematically with depth and correlate well with 5 previous 14C dates (Hope et al., unpublished), ranging between 15,040 ± 120 BP and 19,000 ± 310 BP. This suggests that the data set represents a possible minimum age of the bulk organic matter, and considering the high organic matter contents of approximately 8%, has implications for the age of the megafauna buried in this layer. The overlying modern soil, with its much younger date, contains lower levels of organic matter (3–7%) and gastropods not seen in the fossil layer. This suggests a substantial change in environmental conditions probably due to an alteration in the floodplain drainage conditions. This chronological and sedimentalogical discontinuity indicates that 2 distinct depositional regimes existed and were separated by up to 10,000 14C yr. A calcareous, sandy silt deposit underlying the fossil layer is a calcarenite deposit with low total organic content and is considered the base of the section; it suggests a third separate depositional episode. As such, the Black Creek Swamp in the southwest corner of Kangaroo Island formed intermittently over at least the last 20,000 yr during 3 distinct depositional phases, one of which was the formation of the fossil-laden, organic-rich floodplain surface, which has a possible minimum age of approximately 15,000 to 19,000 BP.

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Section: Discussionmentioning

confidence: 99%

Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

2004

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“…Since the event of formation of the Lamayuru lake has earlier been dated as 35.5 ± 0.6 ka BP (Fort, Burbank & Freytet, 1989) and as 40 ka BP (Bagati, Mazari & Rajagopalan, 1996), we assume this event to have occurred approximately between 35-40 ka BP. So far, a few events of magnetic disturbance observed elsewhere around this period are: an excursion estimated at 40 ka BP from the Indian Ocean sediments (Opdyke, Shackleton & Hays, 1974), and an event dated to 35 ± 4.3 ka BP within the site of Lake Mungo (Huxtable & Aitken, 1977). Since we have observed only the uppermost part of the Lamaruyu event, it is not possible to estimate its duration.…”

Section: Discussionmentioning

confidence: 93%

Quaternary fluvio-lacustrine deposits of the Lamayuru Basin, Ladakh Himalaya: preliminary multidisciplinary investigations

et al. 1997

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Preliminary multidisciplinary investigations were carried out in a 105 m thick late Pleistocene terrestrial sequence in the Lamayuru basin, Ladakh Himalaya. Palaeomagnetic studies reveal a reversal of polarity at about 35 ka BP. This is the only report of this reversal event in the late Pleistocene terrestrial sequences of the Indian subcontinent. The valley fill sequence is the product of an interplay of lacustrine with fluvio-deltaic to colluvial processes. Four fossiliferous horizons have yielded ostracods and gastropods indicating shallow freshwater conditions. The Lamayuru lake was created by tectonically induced instability about 35-40 ka BP, an event that may be represented widely throughout the Himalaya.

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“…Huxtable and Aitken (1977), on the basis of TL ages from the same site, commented that such a dierence was possible but that the uncertainty in their results did not permit a de®nite conclusion.…”

Section: Datingmentioning

confidence: 99%

Sediment dating by luminescence: a review

Prescott

Robertson

1997

Radiation Measurements

137

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AbstractÐIn the present article we review applications of luminescence methods for the determination of the age of sediments for Quaternary Earth science.``Sediment'' is taken to include any mineral particles transported by wind, water and/or ice and subsequently deposited. Methodology is not discussed per se but appears in context. The emphasis is on recent work and is illustrative rather than exhaustive. Applications in archaeology are mentioned only brie¯y. Successful dating requires that the luminescence signal has been zeroed by sunlight at the time the sediment was laid down. Dune sands and loess transported in full daylight usually satisfy this condition and have been dated by both traditional thermoluminescence and by optical methods. Optical dating is advantageous for less well-bleached sediments, such as are found in colder climates and those laid down by¯uvial and glacial processes, although the prospects for dating the latter are shown to be poor. Among less common contexts are volcanic eruptions, earthquake faults and tsunami deposits. The dating of very young sediments, less than 2 ka, is demonstrated and the factors limiting the dating of very old sediments, 500 ka to 1 Ma, are discussed. Validation of any dating method by comparison with other methods is necessary; luminescence ages have been successfully compared with ages obtained by, for example, 14 C, U±Th series and d 18O isotope ratios. The most dicult problems encountered in dating quartz, feldspars and undierentiated ®ne grain mixtures include: anomalous fading (which leads to underestimates of age), incomplete zeroing (which gives overestimates) and sample inhomogeneity. Methods devised to minimise these eects include preheating regimes, selection of observing wavelengths and of stimulating wavelengths for optical dating, the use of single aliquot and single grain measurements. The use of appropriate data analysis procedures is also important. Advice on current best practice on procedures for obtaining reliable ages is oered and, in all applications, there are suggestions as to where further research might be directed. #

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Thermoluminescent dating of Lake Mungo geomagnetic polarity excursion

Cited by 43 publications

References 9 publications

Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

Quaternary fluvio-lacustrine deposits of the Lamayuru Basin, Ladakh Himalaya: preliminary multidisciplinary investigations

Sediment dating by luminescence: a review

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Thermoluminescent dating of Lake Mungo geomagnetic polarity excursion

Cited by 43 publications

References 9 publications

Preliminary 14C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

Preliminary 14C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

Quaternary fluvio-lacustrine deposits of the Lamayuru Basin, Ladakh Himalaya: preliminary multidisciplinary investigations

Sediment dating by luminescence: a review

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Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia

Preliminary ¹⁴C Dates on Bulk Soil Organic Matter from the Black Creek Megafauna Fossil Site, Rocky River, Kangaroo Island, South Australia