Luminescence dating
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第四紀沉積定年概論 Luminescence Dating PowerPoint PPT Presentation


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第四紀沉積定年概論 Luminescence Dating. 陳于高老師 陳雅雯. 螢光發光原理. 電子陷阱之參數數值. a The peak temperatures are for the heating rates used in the work concerned, usually 2-10 o C/sec. b IR, initial rise; ID, isothermal decay; PS, peak shift with heating rate; CF, curve fitting. (Aitken, 1985).

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第四紀沉積定年概論 Luminescence Dating

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Luminescence dating

第四紀沉積定年概論Luminescence Dating

陳于高老師

陳雅雯


Luminescence dating

螢光發光原理


Luminescence dating

電子陷阱之參數數值

a The peak temperatures are for the heating rates used in the work concerned, usually 2-10oC/sec.

b IR, initial rise; ID, isothermal decay; PS, peak shift with heating rate; CF, curve fitting.

(Aitken, 1985)


Luminescence dating

Equivalent dose

Annual dose

Natural intensity

Age = =

Annual intensity

螢光定年


Luminescence dating

標本的前處理


Luminescence dating

螢光定年法

Age =

Annual dose


Annual dose

年劑量的計算(Annual dose)

  • 直接法:

  • 於現場放置劑量子(TLD)

  • 間接法:

  • ICPMS(U.Th)+XRF(K)

  • Gamma Spectrometry

  • (U.Th.K)

  • 宇宙射線:

  • 校正因緯度、深度、高度的不同而造成的差異。


Luminescence dating

螢光定年法

Equivalent dose

Age =

Annual dose


Equivalent dose

熱螢光強度

(TL Intensity)

光螢光強度

(OSL Intensity)

N+b2

b3

N+b1

b2

N

N

b1

N+SL

劑量(Dose)

劑量(Dose)

Dt

De

D(I0)

等效劑量的求取(Equivalent dose)

一、增加劑量法( Additive Dose Method)

二、再生法(Regeneration Method)


Luminescence dating

光螢光定年法

熱螢光定年法

製樣方式

粗粒法

細粒法

分析礦物

單一礦物

多種礦物組合

顆粒大小

63 - 300 m

4 - 11 m

測試溫度

低溫峰(110ºC)

高溫峰(375ºC)

年代範圍

最大可至100萬年

幾十萬年

起始值

接近底限值

難以估計

熱螢光與光螢光之比較


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