Rivista e Edizione

Volume 49 (2022): Edizione 1 (January 2022)

Volume 48 (2021): Edizione 1 (January 2021)

Volume 47 (2020): Edizione 1 (January 2020)

Volume 46 (2019): Edizione 1 (January 2019)

Volume 45 (2018): Edizione 1 (January 2018)

Volume 44 (2017): Edizione 1 (January 2017)

Volume 43 (2016): Edizione 1 (February 2016)

Volume 42 (2015): Edizione 1 (January 2015)

Volume 41 (2014): Edizione 4 (December 2014)

Volume 41 (2014): Edizione 3 (September 2014)

Volume 41 (2014): Edizione 2 (June 2014)

Volume 41 (2014): Edizione 1 (March 2014)

Volume 40 (2013): Edizione 4 (December 2013)
Special Edizione Title: Proceedings of the 3rd Asia Pacific Conference on Luminescence and Electron Spin Resonance Dating Okayama, Japan, 2012

Volume 40 (2013): Edizione 3 (September 2013)

Volume 40 (2013): Edizione 2 (June 2013)

Volume 40 (2013): Edizione 1 (March 2013)

Volume 39 (2012): Edizione 4 (December 2012)

Volume 39 (2012): Edizione 3 (September 2012)

Volume 39 (2012): Edizione 2 (June 2012)

Volume 39 (2012): Edizione 1 (March 2012)

Volume 38 (2011): Edizione 4 (December 2011)

Volume 38 (2011): Edizione 3 (September 2011)
Special Edizione Title: Proceedings of the 2nd Asia Pacific Conference on Luminescence Dating, Ahmedabad, India, 2009. Part II Edizione Editors: Andrzej Bluszcz, Silesian University of Technology, Gliwice, Poland. Andrzej.Bluszcz@polsl.pl Sheng-Hua Li, The University of Hong Kong, Hong Kong, China. shli@hku.hk Ashok Kumar Singhvi, Physical Research Laboratory, Ahmedabad, India. singhvi@prl.res.in

Volume 38 (2011): Edizione 2 (June 2011)

Volume 38 (2011): Edizione 1 (March 2011)

Volume 37 (2010): Edizione -1 (December 2010)
Proceedings of the 2 Asia Pacific Conference on Luminescence Dating, Ahmedabad, India, 2009. Part I Editors Andrzej Bluszcz, Sheng-Hua Li and Ashok Kumar Singhvi

Volume 36 (2010): Edizione -1 (August 2010)

Volume 35 (2010): Edizione -1 (April 2010)

Volume 34 (2009): Edizione -1 (December 2009)

Volume 33 (2009): Edizione -1 (June 2009)

Volume 32 (2008): Edizione -1 (December 2008)

Volume 31 (2008): Edizione -1 (August 2008)

Volume 30 (2008): Edizione -1 (April 2008)

Volume 29 (2007): Edizione -1 (December 2007)

Volume 28 (2007): Edizione -1 (September 2007)

Volume 27 (2007): Edizione -1 (June 2007)

Volume 26 (2007): Edizione -1 (March 2007)

Dettagli della rivista
Formato
Rivista
eISSN
1897-1695
Pubblicato per la prima volta
04 Jul 2007
Periodo di pubblicazione
1 volta all'anno
Lingue
Inglese

Cerca

Volume 40 (2013): Edizione 3 (September 2013)

Dettagli della rivista
Formato
Rivista
eISSN
1897-1695
Pubblicato per la prima volta
04 Jul 2007
Periodo di pubblicazione
1 volta all'anno
Lingue
Inglese

Cerca

6 Articoli
access type Accesso libero

Historical mortars dating from OSL signals of fine grain fraction enriched in quartz

Pubblicato online: 19 Jun 2013
Pagine: 153 - 164

Astratto

Abstract

In the last years the mortar dating through Optically Stimulated Luminescence (OSL) techniques has become a viable support for chronological estimations (date of construction or restoration episodes) of historical buildings. However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose. This paper discusses the results obtained by OSL dating (blue diode stimulation) on the polymineral fine grain phase, enriched in quartz, extracted from lime mortar samples collected from different sites. Thermal transfer effects, through the behaviour of Equivalent Dose (ED) and recovery tests, degree and time of bleaching were studied. For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence (TL) dating on the bricks.

The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions.

Parole chiave

  • historical mortars
  • luminescence dating
  • partial bleaching test
  • preheating test
  • age model
access type Accesso libero

Investigations on the degree of bleaching of quartz OSL signals using modern aeolian dust from western Loess Plateau, China

Pubblicato online: 19 Jun 2013
Pagine: 165 - 176

Astratto

Abstract

Optically Stimulated Luminescence signal of quartz extracted from modern aeolian dust with known maximum age (about decades) was analyzed in terms of degree of bleaching. The results of dose recovery tests show that the modified double single-aliquot regenerative-dose protocol with the early background subtraction is robust for dating these modern dusts using small aliquots. Bleaching of these dusts is discussed based on the distribution of De values in histograms, scatter plots of De versus sensitivity corrected natural OSL signal and comparison between measured De and expected De. The results indicate that most dusts were completely bleached but some dusts were not completely bleached. For those incompletely bleached dusts in Lanzhou area, the maximum OSL age overestimation is up to ∼1 ka, which might be caused by fast deposition accompanied by heavy sand/dust storms. The research suggests that cautions should be given to OSL ages younger than 1 ka in the western China close to deserts.

Parole chiave

  • Incomplete bleaching
  • Quartz
  • Modern dust
  • Chinese Loess Plateau
access type Accesso libero

Multi-proxy reconstruction of mire development in the Poręby Wojsławskie ecosystem (Sandomierz Basin, southeastern Poland)

Pubblicato online: 19 Jun 2013
Pagine: 177 - 186

Astratto

Abstract

Multi-proxy analysis (sedimentological, palaeobotanical, geochemical data and results of radiocarbon dating) of the biogenic sediments from a small mire ecosystem in the Sandomierz Basin (SE Poland) is presented. The ecosystem contains a full hydroseral sequence from minerotrophic to ombrotrophic wetland. It is one of the few sites in this region which is so thoroughly investigated in terms of the palaeoenvironmental record. Changes in the water supply of the mire area, and consequently the changes in the plant and sediment succession, were well correlated with the regional tendencies in precipitation and temperature during the Late Glacial/Holocene transition and in the Holocene. Human impact is very well recorded in pollen diagram from the Subboreal period.

Parole chiave

  • multi-proxy analysis
  • peat
  • gyttja
  • radiocarbon dating
  • Sandomierz Basin
  • SE Poland
access type Accesso libero

Holocene sediments of the Ustka Cliff (Northern Poland) in view of radiometric dating

Pubblicato online: 19 Jun 2013
Pagine: 187 - 194

Astratto

Abstract

The cliff in Ustka is an active one. The area is one of the most eroded sea shores of the Polish coast. The Ustka Cliff mainly consists of Holocene sandy deposits, but its basis is built of glacial till and clay. Field search allowed to recognize the structure and sedimentary conditions of Holocene deposits exposed in the cliff. A comparison of dating results obtained for fossil soils and peat as well as aeolian deposits, using 14C and TL methods, respectively, with available literature records is presented. The evaluation of results obtained allowed to define three main dune-forming phases for the first time for this part of the Polish coast. During the research studies new data on the processes and environmental conditions was gained and the development of structure of the area during the last 10 thousand years was reconstructed. The analysis of available data from other sections of the southern Baltic coast shows that results obtained are age similar to those determined for the Łeba Spit. The research is part of a project concerning the geomorphology of the Ustka Bay.

Parole chiave

  • southern Baltic
  • Ustka Cliff
  • dunes
  • fossil soils
  • TL
  • 14C
access type Accesso libero

Climatic signal in tree-ring chronologies of Cedrus deodara from Chitral Hindukush Range of Pakistan

Pubblicato online: 19 Jun 2013
Pagine: 195 - 207

Astratto

Abstract

Tree-rings are an important tool for the investigation of paleoclimatic records for regions or periods of time with no instrumental climatic data. However, the responses of different species and sites to various climatic parameters are unusual. In the present study, we developed tree-ring-width chronologies of Cedrus deodara from three different sites of Chitral Hindukush range of Pakistan. The study was conducted to understand tree-growth climate relationship and its applicability in proxy climate investigations. The chronologies covered the past 469 to 595 years, with a mean segment length (MSL) ranging from 148 to 223 years. Climatic data obtained from the three weather stations showed strong correlation and was found useful for tree-ring climate relationships.

Correlation Function (CF) and Response Function (RF) analysis showed that spring precipitation (March–May) is a critical limiting factor for tree-ring growth, and temperature prior to November may also play a major role in affecting tree ring-growth. The results exposed that the three sites have continuous relationship indicated that only single species from different locations are affected by the same environmental variables and hence can be used in climate reconstruction in combination. The Cedrus deodara chronologies developed at different locations had several corresponding narrow and wide marker rings indicating a large macroclimatic response to regional climatic conditions. The current study suggests that the tree-rings of Cedrus deodara from the Chitral Hindukush range could be used to develop chronologies for the reconstruction of seasonal climatic variables.

Parole chiave

  • Cedrus deodara
  • tree-growth
  • proxy climate
  • response function
  • Hindukush range
access type Accesso libero

Human-planted alder trees as a protection against debris flows (a dendrochronological study from the Moxi Basin, Southwestern China)

Pubblicato online: 19 Jun 2013
Pagine: 208 - 216

Astratto

Abstract

Large debris flows have destroyed the infrastructure and caused the death of people living in the Moxi Basin (Sichuan Province, Southwestern China). Inhabitants of the Moxi Basin live on the flat surfaces of debris-flow fans, which are also attractive for farming. During the monsoon season debris flows are being formed above the fans. Debris flows can destroy the houses of any people living within the fan surfaces. In order to prevent the adverse effects of flows, people plant alder trees (Alnus nepalensis) at the mouths of debris flow gullies running above debris flow fans. Alders are able to capture the debris transported during flow events. Trees are well adapted to surviving in conditions of environmental stress connected with abrupt transport and deposition of sediment from debris flows. Numerous wounds, tilting and bending of alder trees caused by debris flows only very rarely cause the death of trees. By dating scars and dating the time of alder tilting (through the analysis of annual rings), we have determined the frequency of debris flows occurring at the mouth of the Daozhao valley. In 1980–2012 within the studied debris-flow fan and the Daozhao gully, 2 large debris flow events occurred (1996, 2005) and some smaller events were probably recorded every 2–3 years.

Parole chiave

  • debris flow
  • dendrochronology
  • tree wound dating
  • eccentric growth of trees dating
  • South-Western China
6 Articoli
access type Accesso libero

Historical mortars dating from OSL signals of fine grain fraction enriched in quartz

Pubblicato online: 19 Jun 2013
Pagine: 153 - 164

Astratto

Abstract

In the last years the mortar dating through Optically Stimulated Luminescence (OSL) techniques has become a viable support for chronological estimations (date of construction or restoration episodes) of historical buildings. However, the dating of mortar has still open issues mainly regarding the assessment of the bleaching degree of quartz, the analysis of the OSL processes for this type of samples and the need to do appropriate tests for the most correct evaluation of the equivalent dose. This paper discusses the results obtained by OSL dating (blue diode stimulation) on the polymineral fine grain phase, enriched in quartz, extracted from lime mortar samples collected from different sites. Thermal transfer effects, through the behaviour of Equivalent Dose (ED) and recovery tests, degree and time of bleaching were studied. For each mortar sample the adjacent brick was collected; in some cases, sampling of the bricks bracketing a mortar layer was a possibility, thus obtaining a direct comparison with the standard thermoluminescence (TL) dating on the bricks.

The results obtained show, for this set of samples, the possibility of dating the mortars through the use of the fine grain fraction provided of a suitable chemical-physical preparation procedure and the verification of the bleaching conditions.

Parole chiave

  • historical mortars
  • luminescence dating
  • partial bleaching test
  • preheating test
  • age model
access type Accesso libero

Investigations on the degree of bleaching of quartz OSL signals using modern aeolian dust from western Loess Plateau, China

Pubblicato online: 19 Jun 2013
Pagine: 165 - 176

Astratto

Abstract

Optically Stimulated Luminescence signal of quartz extracted from modern aeolian dust with known maximum age (about decades) was analyzed in terms of degree of bleaching. The results of dose recovery tests show that the modified double single-aliquot regenerative-dose protocol with the early background subtraction is robust for dating these modern dusts using small aliquots. Bleaching of these dusts is discussed based on the distribution of De values in histograms, scatter plots of De versus sensitivity corrected natural OSL signal and comparison between measured De and expected De. The results indicate that most dusts were completely bleached but some dusts were not completely bleached. For those incompletely bleached dusts in Lanzhou area, the maximum OSL age overestimation is up to ∼1 ka, which might be caused by fast deposition accompanied by heavy sand/dust storms. The research suggests that cautions should be given to OSL ages younger than 1 ka in the western China close to deserts.

Parole chiave

  • Incomplete bleaching
  • Quartz
  • Modern dust
  • Chinese Loess Plateau
access type Accesso libero

Multi-proxy reconstruction of mire development in the Poręby Wojsławskie ecosystem (Sandomierz Basin, southeastern Poland)

Pubblicato online: 19 Jun 2013
Pagine: 177 - 186

Astratto

Abstract

Multi-proxy analysis (sedimentological, palaeobotanical, geochemical data and results of radiocarbon dating) of the biogenic sediments from a small mire ecosystem in the Sandomierz Basin (SE Poland) is presented. The ecosystem contains a full hydroseral sequence from minerotrophic to ombrotrophic wetland. It is one of the few sites in this region which is so thoroughly investigated in terms of the palaeoenvironmental record. Changes in the water supply of the mire area, and consequently the changes in the plant and sediment succession, were well correlated with the regional tendencies in precipitation and temperature during the Late Glacial/Holocene transition and in the Holocene. Human impact is very well recorded in pollen diagram from the Subboreal period.

Parole chiave

  • multi-proxy analysis
  • peat
  • gyttja
  • radiocarbon dating
  • Sandomierz Basin
  • SE Poland
access type Accesso libero

Holocene sediments of the Ustka Cliff (Northern Poland) in view of radiometric dating

Pubblicato online: 19 Jun 2013
Pagine: 187 - 194

Astratto

Abstract

The cliff in Ustka is an active one. The area is one of the most eroded sea shores of the Polish coast. The Ustka Cliff mainly consists of Holocene sandy deposits, but its basis is built of glacial till and clay. Field search allowed to recognize the structure and sedimentary conditions of Holocene deposits exposed in the cliff. A comparison of dating results obtained for fossil soils and peat as well as aeolian deposits, using 14C and TL methods, respectively, with available literature records is presented. The evaluation of results obtained allowed to define three main dune-forming phases for the first time for this part of the Polish coast. During the research studies new data on the processes and environmental conditions was gained and the development of structure of the area during the last 10 thousand years was reconstructed. The analysis of available data from other sections of the southern Baltic coast shows that results obtained are age similar to those determined for the Łeba Spit. The research is part of a project concerning the geomorphology of the Ustka Bay.

Parole chiave

  • southern Baltic
  • Ustka Cliff
  • dunes
  • fossil soils
  • TL
  • 14C
access type Accesso libero

Climatic signal in tree-ring chronologies of Cedrus deodara from Chitral Hindukush Range of Pakistan

Pubblicato online: 19 Jun 2013
Pagine: 195 - 207

Astratto

Abstract

Tree-rings are an important tool for the investigation of paleoclimatic records for regions or periods of time with no instrumental climatic data. However, the responses of different species and sites to various climatic parameters are unusual. In the present study, we developed tree-ring-width chronologies of Cedrus deodara from three different sites of Chitral Hindukush range of Pakistan. The study was conducted to understand tree-growth climate relationship and its applicability in proxy climate investigations. The chronologies covered the past 469 to 595 years, with a mean segment length (MSL) ranging from 148 to 223 years. Climatic data obtained from the three weather stations showed strong correlation and was found useful for tree-ring climate relationships.

Correlation Function (CF) and Response Function (RF) analysis showed that spring precipitation (March–May) is a critical limiting factor for tree-ring growth, and temperature prior to November may also play a major role in affecting tree ring-growth. The results exposed that the three sites have continuous relationship indicated that only single species from different locations are affected by the same environmental variables and hence can be used in climate reconstruction in combination. The Cedrus deodara chronologies developed at different locations had several corresponding narrow and wide marker rings indicating a large macroclimatic response to regional climatic conditions. The current study suggests that the tree-rings of Cedrus deodara from the Chitral Hindukush range could be used to develop chronologies for the reconstruction of seasonal climatic variables.

Parole chiave

  • Cedrus deodara
  • tree-growth
  • proxy climate
  • response function
  • Hindukush range
access type Accesso libero

Human-planted alder trees as a protection against debris flows (a dendrochronological study from the Moxi Basin, Southwestern China)

Pubblicato online: 19 Jun 2013
Pagine: 208 - 216

Astratto

Abstract

Large debris flows have destroyed the infrastructure and caused the death of people living in the Moxi Basin (Sichuan Province, Southwestern China). Inhabitants of the Moxi Basin live on the flat surfaces of debris-flow fans, which are also attractive for farming. During the monsoon season debris flows are being formed above the fans. Debris flows can destroy the houses of any people living within the fan surfaces. In order to prevent the adverse effects of flows, people plant alder trees (Alnus nepalensis) at the mouths of debris flow gullies running above debris flow fans. Alders are able to capture the debris transported during flow events. Trees are well adapted to surviving in conditions of environmental stress connected with abrupt transport and deposition of sediment from debris flows. Numerous wounds, tilting and bending of alder trees caused by debris flows only very rarely cause the death of trees. By dating scars and dating the time of alder tilting (through the analysis of annual rings), we have determined the frequency of debris flows occurring at the mouth of the Daozhao valley. In 1980–2012 within the studied debris-flow fan and the Daozhao gully, 2 large debris flow events occurred (1996, 2005) and some smaller events were probably recorded every 2–3 years.

Parole chiave

  • debris flow
  • dendrochronology
  • tree wound dating
  • eccentric growth of trees dating
  • South-Western China

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