<abstract xmlns="http://www.w3.org/1999/xhtml">Thermoluminescence (TL) and isothermal thermoluminescence (ITL) signals from K-feldspar were studied. The signals from K-feldspar have provided multiple thermometers for thermochronological study. Protocols of multiple aliquot (MA) additive-dose (A) and regenerative-dose (R) have been applied and tested for equivalent dose (De) determinations using TL and ITL signals (MAA-TL, MAR-TL, MAA-ITL and MAR-ITL). Single aliquot regenerative-dose (SAR) protocol was only applied for De determination using ITL signals (SAR-ITL). A 50–60°C translation of heating temperature was necessary for the ITL De values to agree with TL De values. Based on the experiment results and merits-drawbacks comparison of the five tested protocols, the MAR-TL and SAR-ITL are favorable because of their efficiency and accuracy in De determinations. These two protocols were further applied to the samples from the Nujiang River valley and both explicitly demonstrated the thermal history of the samples. They are suitable for K-feldspar thermochronology study. They, as a parallelism of the previous studies of quartz TL and ITL signals, can provide multiple measures for a rock sample with the same thermal history in geo-thermochronological studies.</abstract>

Thermoluminescence (TL) and isothermal thermoluminescence (ITL) signals from K-feldspar were studied. The signals from K-feldspar have provided multiple thermometers for thermochronological study. Protocols of multiple aliquot (MA) additive-dose (A) and regenerative-dose (R) have been applied and tested for equivalent dose (De) determinations using TL and ITL signals (MAA-TL, MAR-TL, MAA-ITL and MAR-ITL). Single aliquot regenerative-dose (SAR) protocol was only applied for De determination using ITL signals (SAR-ITL). A 50–60°C translation of heating temperature was necessary for the ITL De values to agree with TL De values. Based on the experiment results and merits-drawbacks comparison of the five tested protocols, the MAR-TL and SAR-ITL are favorable because of their efficiency and accuracy in De determinations. These two protocols were further applied to the samples from the Nujiang River valley and both explicitly demonstrated the thermal history of the samples. They are suitable for K-feldspar thermochronology study. They, as a parallelism of the previous studies of quartz TL and ITL signals, can provide multiple measures for a rock sample with the same thermal history in geo-thermochronological studies.

Low temperature thermochronology using thermoluminescence signals from K-feldspar

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Thermoluminescence (TL) and isothermal thermoluminescence (ITL) signals from K-feldspar were studied. The signals from K-feldspar have provided multiple...

	MAA-TL	MAR-TL	MAA-ITL	MAR-ITL	SAR-ITL
TL peaks (geothermometers) can be measured in one run	✓	✓	✘	✘	✘
Well studied kinetics parameters	✓	✓	✘	✘	✘
Multiple aliquots protocol requires shorter machine time	✓	✓	✓	✓	✘
TL glow curves indicate the thermal stability	✓	✓	✘	✘	✘
Overcome weak ITL signals problem	✓	✓	✘	✘	✘
Sensitivity change of reheating can be minimized	✓	✘	✓	✘	✘
Apply to ITL signals components fitting	✘	✘	✓	✓	✓
Don’t need normalization	✘	✘	✘	✘	✓
Avoid overlapping TL peaks	✘	✘	✓	✓	✓
Overcome the atmosphere protection of the TL oven	✘	✘	✓	✓	✓
Overcome blackbody radiation	✘	✘	✓	✓	✓
Need less sample materials	✘	✓	✘	✓	✓
Obtain De by interpolation from growth curve	✘	✓	✘	✓	✓
	Advantage ✓		Disadvantage ✘

Sample	D_e of MAR-TL (Gy)									D_e of SAR-ITL (Gy)
Sample	At 250°C	At 260°C	At 270°C	At 280°C	At 290°C	At 300°C	At 310°C	At 320°C	At 330°C	At 235°C	At 255°C
FG-A	23.9±3.1	33.7±4.8	50.1±7.5	76.9±11.2	116.5±15.2	167.6±19.5	227.2±23.8	287.5±27.1	342.4±30.9	56.1±12.3	146.0±9.1
FG-B	20.8±2.8	30.1±4.2	47.3±6.4	77.0±9.5	123.6±13.2	189.5±16.6	271.2±19.4	361.4±21.7	449.9±23.6	73.7±11.2	203.7±15.6
FG-C	29.5±3.7	43.1±5.6	65.2±8.2	99.4±11.5	147.9±14.8	209.1±16.8	276.1±17.1	340.4±16.3	395.1±17.1	109.8±7.0	243.2±14.5

Low temperature thermochronology using thermoluminescence signals from K-feldspar

Publicado en línea: 01 jun 2017

Páginas: 112 - 120

Recibido: 14 feb 2016

Aceptado: 12 feb 2017

DOI: https://doi.org/10.1515/geochr-2015-0057

Palabras clave
thermochronology, luminescence signals, K-feldspar, protocol

© 2016 S.L. Tang and S.H. Li.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Evaluation form of MAA-TL, MAR-TL, MAA-ITL, MAR-ITL and SAR-ITL protocols.

Fugong valley samples De results determined using MAR-TL and SAR-ITL protocols.

Low temperature thermochronology using thermoluminescence signals from K-feldspar

Publicado en línea: 01 jun 2017

Páginas: 112 - 120

Recibido: 14 feb 2016

Aceptado: 12 feb 2017

DOI: https://doi.org/10.1515/geochr-2015-0057

Palabras clavethermochronology, luminescence signals, K-feldspar, protocol

© 2016 S.L. Tang and S.H. Li.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Evaluation form of MAA-TL, MAR-TL, MAA-ITL, MAR-ITL and SAR-ITL protocols.

Fugong valley samples De results determined using MAR-TL and SAR-ITL protocols.

Palabras clave
thermochronology, luminescence signals, K-feldspar, protocol