Luminescence dating of late Pleistocene proximal glacial sediments in the Olympic Mountains, Washington

Wyshnytzky, Cianna E.; Rittenour, Tammy M.; Nelson, Michelle S.; Thackray, Glenn D.

doi:10.1016/j.quaint.2014.08.024

Cited by 11 publications

(9 citation statements)

References 34 publications

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“…The MAM sta tis ti cally se lects the aliquots with the low est D e 's, that is, those that were most prob a bly suf fi ciently bleached (Wyshnytzky et al, 2015), and in this study pro vides 9-12 ka youn ger ages (Ta ble 2); this is, how ever, within the er ror of presented mean ages. The prob a bil ity (p) value for the Nereta and Kalna Bñbli sam ples is high and in these cases the MAM has pro duced re li able ages.…”

Section: Fig 4 Examples Of Growth and Decay Curves For The Lªèi 1 (mentioning

confidence: 66%

New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia

Lamsters

Kalińska

Zelčs

et al. 2017

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New op ti cally stim u lated lu mi nes cence (OSL) ages show that sandy de pos its over lain by Late Weichselian subglacial till in cen tral Lat via are of Early to Mid dle Weichselian age. The finer chro no log i cal res o lu tion of un con sol i dated sed i ment de po sition in the Cen tral Lat vian Low land (CLL) re mains rel a tively un stud ied, and here we pro vide a first char ac teri sa tion of the depos its with re spect to their age. Three OSL ages rang ing be tween 84 ± 9 ka and 112 ± 11 ka sug gest that the de pos its stud ied in the CLL are of Early Weichselian age (MIS 5). We found no Mid dle Weichselian de pos its in the CLL, and as sume that any such youn ger sed i ments might have been eroded dur ing the ad vance of the Zemgale Lobe in the Late Weichselian. One site, in the ice-mar ginal zone ad ja cent to the interlobate area, has nev er the less de pos its dated to 44 ± 10 ka cor re spond ing to the Mid dle Weichselian (MIS 3). Our re sults are com pat i ble with ex ist ing ESR ages on three sets of Portlandia arctica shells from the cen tral part of the low land; the shells had been in cor po rated into gla cial de pos its dur ing later gla cial ad vances. Fi nally, our find ings largely sup port ice-free con di tions dur ing the Early and Mid dle Weichselian in the mid dle and south ern part of cen tral Lat via. Key words: op ti cally stim u lated lu mi nes cence (OSL) dat ing, subglacial bedforms, Early Weichselian, Mid dle Weichselian, cen tral Lat via.

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Section: Fig 4 Examples Of Growth and Decay Curves For The Lªèi 1 (mentioning

confidence: 66%

New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia

Lamsters

Kalińska

Zelčs

et al. 2017

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“…Depositional ages of sediment in the terraces were determined by OSL dating of quartz sand following the single-aliquot regenerative dose method (Murray and Wintle, 2000). While OSL dating can be challenging in fluvial environments, deposits from these settings can be accurately dated by selecting depositional facies most likely to have been reset by sunlight exposure (Fuchs and Owen, 2008;Rittenour, 2008;Wyshnytzky et al, 2015). We preferentially targeted well-sorted, horizontally bedded sand lenses from fluvial deposits to reduce the influence of incomplete resetting (partial bleaching) of the luminescence signal.…”

Section: Methodsmentioning

confidence: 99%

Controls on erosion in the western Tarim Basin: Implications for the uplift of northwest Tibet and the Pamir

et al. 2017

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We present here bulk sediment major element chemistry, Nd and Sr isotope ratios, and detrital apatite fission-track (AFT) and U-Pb zircon ages to characterize the provenance of the southwestern Taklimakan Desert (northwest China) and the three major rivers draining this region. We establish the spatial and temporal controls on erosion and sediment transport in the modern Tibetan rain shadow. The Hotan River drains the North Kunlun block and is characterized by zircon populations at 160-230 Ma and 370-520 Ma. The Yarkand River shares these grains with the Hotan, but also has a very prominent zircon population at 40-160 Ma, which is common in Karakoram basement, indicating heavy sediment flux from these ranges to that drainage. This implies a strong control on erosion by topographic steepness and precipitation mediated through glaciation. Our zircon data confirm earlier studies that indicated that the Taklimakan sand is derived from both the Kunlun and Pamir Mountains. AFT ages are younger in the Hotan River than in the Kashgar River, which drains the Pamir, and in both are younger than in the Transhimalaya and parts of the western edge of the Tibetan Plateau. Exhumation is estimated at ~1000 m/m.y. in the North Kunlun and ~500 m/m.y. in the eastern Pamir, which have been exhuming more slowly than the western ranges in the recent past. Holocene aggradation terracing was dated using quartz optically stimulated luminescence methods and is mostly associated with times of fluctuating climate after 4 ka, with phases of valley filling dated at 2.6, 1.4, and 0.4 ka. The heights and volumes of the terraces show that sediment storage in the mountains is not a significant buffer to sediment transport, in contrast to the more monsoonal Indus system directly to the south. South of the Mazatag Ridge a significant eolian deposit accumulated ~500 yr ago, but this has been deflated in more recent times. Comparison of the modern river data with those previously measured from Cenozoic foreland sedimentary rocks shows that no sediment similar to that of the modern Yarkand River is seen in the geologic record, which is inferred to be younger than 11 Ma, and probably much less. Uplift of the North Kunlun had started by ca. 17 Ma, somewhat after that of the Pamir and Songpan Garze of northwestern Tibet, dated to before 24 Ma. Sediment from the Kunlun reached the foreland basin between 14 and 11 Ma. North Kunlun exhuma tion accelerated before 3.7 Ma, likely linked to faster rock uplift.

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“…However, 14 C, 36 Cl, optically stimulated lumines cence (OSL), Useries, and relative weathering data indicate that MIS 4 and/or MIS 3 ice advances were also widespread. A 14 C chronology and coastal stra tigraphy were used (Thackray, 2001) to document MIS 4 and 3 glaciation in the coastal Olympic Mountains that was far more extensive than MIS 2 glacia tion, a result confirmed and expanded by OSL dating (Wyshnytzky et al, 2015;Marshall, 2013;Staley, 2015). In the eastern Cascade Range, the Porter and Swanson (2008) 36 Cl CRN chronology documented extensive pre-MIS 2 gla ciation, and Colman and Pierce (1992) suggested, using weathering rinds, an extensive MIS 3 ice advance.…”

Section: Previous Workmentioning

confidence: 98%

Systematic variation of Late Pleistocene fault scarp height in the Teton Range, Wyoming, USA: Variable fault slip rates or variable landform ages?

Thackray

Staley

2017

Geosphere

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Fault scarps of strongly varying height cut glacial and alluvial sequences mantling the faulted front of the Teton Range (western USA). Scarp heights vary from 11.2 to 37.6 m and are systematically higher on geomorphically older landforms. Fault scarps cutting a deglacial surface, known from cosmogenic radionuclide exposure dating to immediately postdate 14.7 ± 1.1 ka, average 12.0 m in height, and yield an average postglacial offset rate of 0.82 ± 0.13 m/k.y. using simple scarp height (average 11.2 m, offset rate 0.76 ± 0.11 m/k.y. using vertical separation). We apply the offset rate to higher fault scarps to develop preliminary age estimates for the geomorphically older landforms, with an initial assumption of constant offset rate through time. The landform age estimates of 16.2 ± 3.9 ka to 45.9 ± 11.0 ka imply that glaciation and alluviation influenced the range front during marine isotope stages 2 and 3. However, fault offset rate variability, suggested by previous work to be attributable to Yellowstone ice cap deglacial processes, suggests that the fault scarp height pattern might also be interpreted as a reflection of strongly variable offset rates in landforms of only slightly contrasting age. These results demonstrate the need for detailed geochronology of isochronous landforms and sediments of multiple ages, in order to understand both faulting and glaciation on faulted range fronts.

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Luminescence dating of late Pleistocene proximal glacial sediments in the Olympic Mountains, Washington

Cited by 11 publications

References 34 publications

New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia

New luminescence ages reveal Early to Middle Weichselian deposits in central Latvia

Controls on erosion in the western Tarim Basin: Implications for the uplift of northwest Tibet and the Pamir

Systematic variation of Late Pleistocene fault scarp height in the Teton Range, Wyoming, USA: Variable fault slip rates or variable landform ages?

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