Citation
Yoshida, D. and Tani, A. and Ikeya, M. and Ros Fatihah and Mohd Shafeea Leman and Tjia, H. D. (2010) ESR dating of some stalactites from the Kinta and Lenggong valleys in Perak, Peninsular Malaysia. In: Geological heritage of Malaysia: geoheritage conservation (1997-2009). Institut Alam Sekitar dan Pembangunan (LESTARI), Universiti Kebangsaan Malaysia, Bangi, Selangor, pp. 297-308. ISBN 9789675227370
Abstract
The stalactite samples from two caves, the Gua Naga Mas and Gua Gunung Runtuh, and from multilevel notches at Gunung Rapat in Perak, Peninsular Malaysia have been dated using the electron spin resonance (ESR) method. Copper ion (Cu²⁺) in copper sulphate penta-hydrate (CuSO₄•5H₂O) having an intense wide ESR signal around g = 2.27-2.08 were used as a marker for calibration of the ESR signal intensity because conventional marker of MgO(Mn) was useless due to the impurity in Mn²⁺ content in the carbonate sample. Isotropic SO₂-, axial SO₃-, related with impurity and isotropic CO-₂ used for ESR dating were observed with those of Mn²⁺. The external annual dose at the site of each sample was measured with thermoluminescence dosimeter (TLD) and the internal annual dose was determined from the content of uranium using inductively coupled plasma mass spectrometer (ICP-MS). Uranium-thorium disequilibrium of ²³⁸U series was considered. Estimated ages were from 8.64 ±0.26 ka to 139 ±12 ka, which were identified to oxygen isotope stage 1 to 6.
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Abstract
The stalactite samples from two caves, the Gua Naga Mas and Gua Gunung Runtuh, and from multilevel notches at Gunung Rapat in Perak, Peninsular Malaysia have been dated using the electron spin resonance (ESR) method. Copper ion (Cu²⁺) in copper sulphate penta-hydrate (CuSO₄•5H₂O) having an intense wide ESR signal around g = 2.27-2.08 were used as a marker for calibration of the ESR signal intensity because conventional marker of MgO(Mn) was useless due to the impurity in Mn²⁺ content in the carbonate sample. Isotropic SO₂-, axial SO₃-, related with impurity and isotropic CO-₂ used for ESR dating were observed with those of Mn²⁺. The external annual dose at the site of each sample was measured with thermoluminescence dosimeter (TLD) and the internal annual dose was determined from the content of uranium using inductively coupled plasma mass spectrometer (ICP-MS). Uranium-thorium disequilibrium of ²³⁸U series was considered. Estimated ages were from 8.64 ±0.26 ka to 139 ±12 ka, which were identified to oxygen isotope stage 1 to 6.
Additional Metadata
| Item Type: | Book Section |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad, Universiti Putra Malaysia, 43000 UPM Serdang, Malaysia. QE299.5 G345 Call Number |
| AGROVOC Term: | spelaeology |
| AGROVOC Term: | karst |
| AGROVOC Term: | natural resources |
| AGROVOC Term: | cultural heritage |
| AGROVOC Term: | sampling |
| AGROVOC Term: | geologists |
| AGROVOC Term: | sustainable agriculture |
| Geographical Term: | Malaysia |
| Depositing User: | Ms. Azariah Hashim |
| Date Deposited: | 21 Jan 2025 06:59 |
| Last Modified: | 21 Jan 2025 06:59 |
| URI: | http://webagris.upm.edu.my/id/eprint/1028 |
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