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您的检索式：作者名="Daniel Sakyi"
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| 1 | Zircon Trace Element Constraints on the Evolution of the Paleoproterozoic Birimian Granitoids of the West African Craton(Ghana)显示文摘The Paleoproterozoic Birimian granitoids of the West African Craton(WAC) in the northwestern part of Ghana, have been studied for their zircon trace elements concentrations to infer the source characteristics, origin, and magmatic evolution. The zircons in the granitoids have Th/U ratios ranging from 0.03 to 1.55, and display depleted light rare earth elements(LREE) and enriched heavy rare earth elements(HREE) contents, characterized by pronounced positive to negative anomalies of Eu(Eu/Eu~*=0.14–0.98 and 1.01–6.06, respectively) and Ce(Ce/Ce~*=0.08–0.98 and 1.02–116, respectively), which may imply that they were derived from both magmatic and hydrothermal sources. The geochemical plots of U/Yb vs. Y and Hf, the positive correlation between Hf and the other high field strength elements(HFSE) and high rare earth elements(REE) contents, with enrichment in Ce and depletion in Eu, indicate that the granitoids possibly formed from partial melting of the crust. The trace elements characteristics(i.e., wide range of Hf, Ce/Ce~*, Th/U and Zr/Hf values) of the zircons suggest that crystallization of the magma occurred under variable oxidation states, which spanned over a longer period, implying that our data corroborate interpretations from studies of whole-rock geochemistry and geochronology on the granitoids of northwestern Ghana. This further indicates that the evolution of the Birimian granitoids in this part of the WAC occurred earlier than what had been reported in the literature. | Patrick Asamoah Sakyi Benxun Su Daniel Kwayisi Chen Chen Yang Bai Melesse Alemayehu | 2018 | Journal of Earth Science2018，29，1： | 1 |
| 2 | Trade openness, foreign aid and economic growth in pest liberation Ghana: An application of ARDL bounds test显示文摘 | Daniel Sakyi | 2011 | Journal of Economics and International Finance2011，，3： | 1 |
| 3 | Trade openness, foreign aid and economic growth in post-liberation Ghana: An application of ARDL bounds test 显示文摘 | Daniel Sakyi | 2011 | Journal of Economics and International Finance2011，，3： | 1 |
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