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AAPG Bulletin
Abstract
AAPG Bulletin, V.
2011. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/03241110163
Dating petroleum emplacement by illite 40Ar/39Ar laser stepwise heating: Reply
He-Sheng Shi,1 Jian-Bing Yun,2 Hua-Ning Qiu3
1School of Ocean and Earth Science, Tongji University, Shanghai 200092, China; present address: Shenzhen Subsidiary of the China National Offshore Oil Corporation (CNOOC) Limited, Tower B Offshore Petroleum Building 1, Industry Road 2, Shekou, Shenzhen 518067, China; [email protected]
2Hailaer Petroleum Exploration and Development Headquarters, PetroChina Daqing Oilfield Company Ltd., Hailaer 021000, China; [email protected]
3State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; present address: Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences Wuhan), Ministry of Education, Wuhan 430074, China; [email protected]
ABSTRACT
We appreciate the discussion by Clauer et al. on our article (Yun et al., 2010) on dating petroleum emplacement by illite 40Ar/39Ar laser stepwise heating. Their major comment is “
discuss especially the fact that the authors discarded 39Ar recoil, followed by an evaluation of its impact on the results and the interpretations,” (Clauer et al., 2011, p. 2107). In an illite 40Ar/39Ar stepwise heating experiment, the sample is heated step by step from low to high laser outputs (or from low to high temperatures), which makes different minerals in the illite sample release their gases separately. Compared with a mixture K-Ar age of an illite sample, its 40Ar/39Ar age spectrum by laser stepwise heating technique can better constrain the petroleum emplacement age and reveal the detrital K-feldspar age. High-precision 40Ar/39Ar stepwise heating on illite samples has many superiors to their K-Ar dating despite the 39Ar recoil. The specially designed apparatus for organic gas purification is of crucial importance for us to obtain credible illite 40Ar/39Ar age results.
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