Apatite u thhe dating


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Here, we investigate the U-Th/ He dates, in situ major- and trace- element concentrations, and 87Sr/86Sr ratios of apatites in the dacite from the southwestern Okinawa Trough to constrain its eruption age and the petrogenesis.

Ashrafi Esfahani, Postal code: 1477893855 - Poonak, Tehran, Iran. analgesia as well as flavoring in the Iranian folk medicine. Journal of Asian Earth Sciences 161 (2018) 1–13 Contents lists available at Science Direct Journal of Asian Earth Sciences journal homepage: Full length article U-Th/He dating and chemical compositions of apatite in the dacite from the southwestern Okinawa Trough: Implications for petrogenesis T ⁎ Zuxing Chena,c, Zhigang Zenga,b,c, , Xiaoyuan Wanga,b, Xuebo Yina, Shuai Chena,b, Kun Guoa,b,f, Zhiqing Laid, Yuxiang Zhanga,c, Yao Maa,b, Haiyan Qia, Lin Wue a Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China c University of Chinese Academy of Sciences, Beijing 100049, China d Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China e State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 10029, China f College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China b A R T I C LE I N FO A B S T R A C T Keywords: Apatite U-Th/He dating Major and trace elements 87 Sr/86Sr ratios Southwest Okinawa Trough Apatite has recently gained considerable attention, providing new insight into a wide range of geological processes, such as geochronology, magmatism, metasomatism and metallogenesis. In: Holland, HD, Turekian, KK (Eds.), The Crust Rudnick, RL The Crast.

These principally reflect the propensity for apatites to have comparatively lower U Th concentrations, and thus lower radiogenic He and Pb concentrations, as well as high concentrations of common Pb.

TY - JOURT1 - U/Pb and (U-Th-Sm)/He “double” dating of detrital apatite by laser ablation T2 - A critical evaluation AU - Horne, Alexandra M.

Apatites are present in the dacite as inclusions within pyroxene phenocrysts and are protected them from the external melt environment; therefore, they should retain a reliable record of their original chemical composition.

The U-Th/He dating of apatites indicates that the volcanic eruption that formed the dacite was no older than 0.28 Ma and that the eruption was related to the replenishment of mafic magma.

Sixty-two laser-ablation analyses of a single large crystal of Durango fluorapatite yielded an inverse-variance weighted mean U date of 31.46 ± 0.48 Ma and an inverse-variance weighted mean (U-Th-Sm)/He date of 31.75 ± 0.60 Ma, both of which are in good agreement with previously published conventional dates.

While these results are encouraging, several factors suggest that LADD may be less useful for detrital apatites than for detrital zircons given widely available analytical instrumentation.The Analyte G.2 will be share with one of the Thermo Element2 HR-ICP-MS instrument.



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