An OSL, radiocarbon and tephra isochron-based chronology for Birdlings Flat loess at Ahuriri Quarry, Banks Peninsula, Canterbury, New Zealand

Almond, Peter C., Shanhun, Fiona L., Rieser, Uwe and Shulmeister, James (2007). An OSL, radiocarbon and tephra isochron-based chronology for Birdlings Flat loess at Ahuriri Quarry, Banks Peninsula, Canterbury, New Zealand. In: Quaternary Geochronology: Proceedings of LED 2005. LED 2005, 11th International Conference on Luminescence and Electron Spin Resonance Dating, Cologne, Germany, (4-8). 24-29 July, 2005. doi:10.1016/j.quageo.2006.06.002


Author Almond, Peter C.
Shanhun, Fiona L.
Rieser, Uwe
Shulmeister, James
Title of paper An OSL, radiocarbon and tephra isochron-based chronology for Birdlings Flat loess at Ahuriri Quarry, Banks Peninsula, Canterbury, New Zealand
Conference name LED 2005, 11th International Conference on Luminescence and Electron Spin Resonance Dating
Conference location Cologne, Germany
Conference dates 24-29 July, 2005
Proceedings title Quaternary Geochronology: Proceedings of LED 2005   Check publisher's open access policy
Journal name Quaternary Geochronology   Check publisher's open access policy
Place of Publication Amsterdam, The Netherlands
Publisher Elseveir
Publication Year 2007
Year available 2007
Sub-type Fully published paper
DOI 10.1016/j.quageo.2006.06.002
Open Access Status DOI
ISSN 1871-1014
Volume 2
Issue 1-4
Start page 4
End page 8
Total pages 5
Language eng
Abstract/Summary OSL, radiocarbon dating of pedogenic carbonate and tephrochronology have been used in an attempt to provide a detailed and reliable chronology for Birdlings Flat loess, a thick, proximal loess found on the lower flanks of Banks Peninsula, Canterbury, New Zealand. In a ca 15 m thick section at Ahuriri Quarry the Kawakawa tephra isochron of 26,500 cal. yr BP is identified at a depth of ca. 1.35 m on the basis of glass counting and electron microprobe fingerprinting. Radiocarbon ages of filamentous or root pseudomorph carbonate increase down section from ca. 10,000 cal. yr BP at 2.80 m to ca. 30,000 14C yr BP at 10.90 m. Ages from carbonate lining cracks are often out of sequence, indicating deep percolation by bypass flow down preferential flow paths. OSL ages show reversals with respect to each other, carbonate radiocarbon ages, and with the position and accepted age of Kawakawa tephra. Coincident radiocarbon and OSL ages at 3.85 m depth indicate that OSL ages are underestimates by at least 20%. Before OSL can be deemed a high accuracy dating method of the quatzo-feldspathic loess of South Island, New Zealand, more research into the causes of age underestimation and age reversals must be carried out. The last major episode of loess accumulation on the flanks of Banks Peninsula in Canterbury began before ca. 30,000 14C yr BP (ca. 35,000 cal. yr BP) and possibly before 43,000 yr based on OSL.
Subjects 0502 Environmental Science and Management
Keyword Southern South Island
Kawakawa Tephra
Luminescence Chronology
Glacial Stratigraphy
Paleosol Sequences
Age Calibration
Westland
Dates
Peats
Bp
Q-Index Code C1
Institutional Status Unknown

 
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Created: Wed, 23 Dec 2009, 00:50:02 EST by Ms Lynette Adams on behalf of School of Geography, Planning & Env Management