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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. Nov 8, 2011 - Abstract: Chemical composition, antioxidant and antimicrobial .... In addition, all the apatite grains are fluorapatites with F contents of 1.58–2.54 wt.% and Cl contents of 0.57–0.88 wt.%. natural insecticides as well as in the perfumery industries [23], while ..... These grains are enriched in REEs (∑REE = 3341–5527 ppm) with significant Eu anomalies (Eu/Eu∗ = 0.20–0.24), low Sr/Y radios (0.20–0.35), high 87Sr/86Sr ratios (range from 0.70635 to 0.70697). The (U-Th)/He picking and grain measurement facilities were funded through JSG start-up funds to Stockli and are also used for U-Pb (LA-ICP-MS and TIMS) and other geochronologic sample preparation.

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. Reasonably precise laser ablation (U-Th-Sm)/He dating of detrital apatites requires relatively large crystal sizes (≥ 100 μm in the shortest dimension), with the minimum useful size increasing with decreasing (U-Th-Sm)/He apparent age.



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