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| 1 | Olivine Compositional Mapping of Mafic-Ultramafic Complexes in Eastern Xinjiang(NW China):Implications for Cu-Ni Mineralization and Tectonic Dynamics显示文摘Early Permian mafic-ultramafic complexes in eastern Xinjiang(新疆) are mainly dis-tributed in the Beishan(北山) area,Mid-Tianshan(天山) massif and Jueluotage(觉罗塔格) belt.Sys-tematic compositional mapping of olivines from these Early Permian mafic-ultramafic complexes demonstrates that an apparently spatial distribution and heterogeneous partial melting in the mantle source exists from the Beishan area,across the Mid-Tianshan massif,to the Jueluotage belt from the south to the north.This is probably consistent with the spatial evolutional differences and tectonic fea-tures of these three belts.The decreasing degree of partial melting,as revealed by decreasing Fo con-tents of olivines,from south to north and from east to west reflects the southward subduction of the Paleo-Asian Ocean and the south location of the indistinct mantle plume in the Permian.Simultane-ously,NiO and Fo-mapping in olivine also indicates that sulfide segregation before olivine crystalliza-tion played an important role in Ni-Cu mineralization in the mafic-ultramafic complexes.Olivines with the compositional range of Fo(77-86) and NiO(less than 0.22 wt.%) are more favorable for Ni-Cu sul-fide mineralization. | 苏本勋 秦克章 孙赫 唐冬梅 肖庆华 刘平平 Patrick Asamoah Sakyi | 2012 | Journal of Earth Science2012，23，1： | 11 |
| 2 | Exsolution Lamellae in Olivine Grains of Dunite Units from Different Types of Mafic-Ultramafic Complexes显示文摘Exsolution microstructures in olivine grains from dunite units in a few selected tectonic environments are reported here. They include lamellae of clinopyroxene and clinopyroxene-magnetite intergrowth in the Gaositai and Yellow Hill Alaskan-type complexes, clinopyroxene-magnetite intergrowth in the K?z?lda? ophiolite, and chromite lamellae in the Hongshishan mafic-ultramafic intrusive complex. These lamellae commonly occur as needle-or rod-like features and are oriented in olivine grains. The host olivine grains have Fo contents of 92.5–92.6 in the Gaositai complex, 86.5–90.1 in the Yellow Hill complex, 93.2–93.4 in the K?z?lda? ophiolite and 86.9–88.3 in the Hongshishan complex. Clinopyroxene in the rod-like intergrowth exsolved in olivine grains in the Gaositai and Yellow Hill is diopside with similar major element compositions of Ca O(23.6–24.3 wt%), SiO_2(52.2–54.0 wt%), Al_2O_3(0.67–2.15 wt%), Cr_2O_3(0.10–0.42 wt%) and Na_2O(0.14–0.26 wt%). It falls into the compositional field of hydrothermal clinopyroxene and its origin is thus probably related to reaction between dunite and fluids. The enrichment of the fluids in Ca^(2+), Fe^(3+), Cr^(3+) and Na+, resulted in elevated concentrations of these cations in olivine solid solutions via the reaction. With decreasing temperature, the olivine solid solutions altered to an intergrowth of magnetite and clinopyroxene. The Fe^(3+) and Cr^(3+) preferentially partitioned into magnetite, while Ca^(2+) and Na+ entered clinopyroxene. Since the studied Alaskan-type complexes and ophiolite formed in a subduction environment, the fluids were probably released from the subducted slab. In contrast, the exsolved chromite in olivine grains from the Hongshishan complex that formed in post-orogenic extension setting can be related to olivine equilibrated with Cr-bearing liquid. Similarly, these lamellae have all been observed in serpentine surrounding olivine grains, indicating genetic relations with serpentinization. | LIANG Zi XIAO yan Joyashish THAKURTA SU Benxun CHEN Chen BAI Yang Patrick A. SAKYI | 2018 | Acta Geologica Sinica(English Edition)2018，92，2： | 3 |
| 3 | Chromite-induced magnesium isotope fractionation during mafic magma differentiation显示文摘To better understand the mechanism of Mg isotopic variation in magma systems, here we report high precision Mg isotopic data of 17 bulk rock samples including dunite, clinopyroxenite, hornblendite and gabbro and 10 pairs of dunite-hosted olivine and chromite separates from the well-characterized Alaskan-type Xiadong intrusion in NW China, which formed by continuous and high degree of lithological differentiation from mafic magmas. Chromite separates have highly variable δ^(26)Mg values from -0.10‰ to 0.40‰, and are consistently heavier than coexisting olivine separates(-0.39‰ to -0.15 T‰). Both mineral δ^(26)Mg values and the degrees of inter-mineral fractionation are well correlated with geochemical indicators of magma differentiation, indicating that these inter-sample and inter-mineral Mg isotope fractionations are caused by magma evolution. The δ^(26)Mg values range from -0.20‰ to -0.02‰ in the dunite,-043‰ in the clinopyroxenite,-043‰ to -0.28‰ in the hornblendite, 0.18 T‰ in the chromite-bearing hornblendite, and -0.56 T‰ to -0.16‰ in the gabbro. The Mg isotopic variations in different types of rocks are closely related to fractional crystallization and accumulation of different proportions of oxides vs. silicates. Chromite crystallization and accumulation is the most important factor in controlling Mg isotope fractionation during the formation of the Xiadong intrusion. Compared to basaltic and granitic magmas, differentiation of the Alaskan-type intrusions occurs at a relatively high oxygen fugacity, which favors chromite crystallization and consequently significant Mg isotope fractionations at both mineral and whole-rock scales. Therefore, Mg isotope systematics can be used to trace the degree of magma differentiation and related-mineralization. | Ben-Xun Su Yan Hu Fang-Zhen Teng Ke-Zhang Qin Yang Bai Patrick Asamoah Sakyi Dong-Mei Tang | 2017 | Science Bulletin2017，62，22： | 2 |
| 4 | Subduction-induced mantle heterogeneity beneath Eastern Tianshan and Beishan: Insights from Nd–Sr–Hf–O isotopic mapping of Late Paleozoic mafic–ultramafic complexes显示文摘 | Ben-Xun Su Ke-Zhang Qin He Sun Dong-Mei Tang Patrick Asamoah Sakyi Zhu-Yin Chu Ping-Ping Liu Qing-Hua Xiao | 2011 | LITHOS2011，，： | 1 |
| 5 | U–Pb ages and Hf–O isotopes of zircons from Late Paleozoic mafic–ultramafic units in the southern Central Asian Orogenic Belt: Tectonic implications and evidence for an Early-Permian mantle plume显示文摘 | Ben-Xun Su Ke-Zhang Qin Patrick Asamoah Sakyi Xian-Hua Li Yue-Heng Yang He Sun Dong-Mei Tang Ping-Ping Liu Qing-Hua Xiao Sanjeewa P.K. Malaviarachchi | 2010 | Gondwana Research2010，，2： | 1 |
| 6 | U- Pb Ages and Hf - O Isotopes of Zircons from Late Paleozoic Mafic-Ultramafic Units in the Southern Central Asian Orogenic Belt: Tectonic Implications and Evidence for an Early Permian Mantle Plume显示文摘 | Su Benxun Qin Kezhang Sakyi P A | 2011 | Gondwana Research2011，20，： | 1 |
| 7 | Hepatocellular carci- noma and microRNA: new perspectives on therapeutics and di- agnostics显示文摘 | YANG N EKANEM NR SAKYI CA | 2015 | Adv Drug Deliv Rev2015，81，： | 1 |
| 8 | Simultaneous Absorption and oxidation of nitric oxide and sulfur dioxide by aqueous solutions of sodium persulfate activated by temperature 显示文摘 | Yusuf G Adewuyi Nana Y Sakyi | 2013 | Ind Eng Chem Res2013，52，11： | 1 |
| 9 | Geochronologic-Petrochemical Studies of the Hongshishan Mafic-Ultramafic Intrusion, Beishan Area, Xinjiang ( NW China):Petrogenesis and Tectonic Implications 显示文摘 | Su Benxun Qin Kezhang Sakyi P A | 2012 | International Geology Review2012，54，3： | 1 |
| 10 | Kinetics and modeling of the removal of nitric oxide by aqueous sodium persulfate simultaneously activated by temperature and Fe2 显示文摘 | Yusuf G Adewuyi Md A Khan Nana Y Sakyi | 2014 | Industrial & Engineering Chemistry Research2014，53，： | 1 |
| 11 | 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 |
| 12 | Occurrence of an Alaskan-type Complex in the Middle Tianshan Massif, Central Asian Orogenic Belt:Inferences from Petrological and Mineralogical Studies 显示文摘 | Su B X Qin K Z Sakyi P A | 2012 | International Geology Review2012，54，3： | 1 |
| 13 | SIMS zircon U-Pb geochronology and Sr-Nd isotopes of Ni-Cu-bearing mafic-ultramafic intrusions in Eastern Tianshan and Beishan in correlation with flood basalts in Tarim basin (NW China):constraints on a ca,280 Ma mande plume显示文摘 | Qin KZ Su BX Patrick Asamoah Sakyi Tang DM Li XH Xiao QH Liu PP | | 0，，： | 1 |
| 14 | Formation of Melt Pocket in Mantle Peridotite Xenolith from Western Qinling, Central China: Partial Melting and Metasomatism显示文摘Two types of melt pockets, closed melt pocket (CMP) and open melt pocket (OMP), are recognized from the peridotite xenoliths entrained in the Cenozoic kamafugites in western Qinling (秦岭), Central China. The Haoti (好梯) CMPs have a mineral assemblage of olivine+ clinopyroxene+amphibole+K-feldspar, whereas the Baiguan (白关) CMPs are composed of olivine+clinopyroxene+ilmenite+carbonate. The components of the OMPs are more complicated. In the Haoti OMPs, there are olivine, clinopyroxene, glass, low modal abundances of amphibole, K-feldspar (Kfs), ilmenite, sulfide, chlorite, perovskite, chromite and phlogopite. TheBaiguan OMPs contain olivine, clinopyroxene, glass, chlorite and chromite. Compositionally, olivines in the CMPs and OMPs are both apparently depleted in Ni, and those in the OMPs are also depleted in Fe and Mg, and enriched in Ca compared to the primary ones. Clinopyroxenes display large and system-atical compositional variations between the CMPs and OMPs, particularly in Al, Cr, Na, Ca and Ti. Glasses are generally depleted in Si compared to the worldwide glasses in melt pockets, although they still have large variations. Amphiboles and K-feldspars have relatively restricted compositional varia-tions. The petrographical observations and mineral chemistry suggest that the Haoti and Baiguan CMPs were generated by the in-situ decompression melting of orthopyroxenes, olivines and clinopy-roxenes, and by the addition of minor external K-rich and Ca-rich melt/fluids. The OMPs formed dur-ing the latest metasomatic event in the lithospheric mantle beneath the western Qinling. | 苏本勋 张宏福 Patrick Asamoah Sakyi 秦克章 刘平平 英基丰 汤艳杰 Sanjeewa P K Malaviarachchi 肖燕 赵新苗 毛骞 马玉光 | 2010 | Journal of Earth Science2010，21，5： | 1 |
| 15 | SIMS Zircon U-Pb geochronology and St-Nd isotopes of Ni-Cu bearing maflc- ultramafic intrusions in Eastern Tianshan and Beishan in correlation with flood basalts in Tarim Basin (NW China) 显示文摘 | Qin KZ Su BX Sakyi PA | 2011 | American Journal of Science2011，311，： | 1 |
| 16 | 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 |
| 17 | Simultaneous absorption and oxidation of nitric oxide and sulfur dioxide by aqueous solutions of sodium persulfate activated by temperature显示文摘 | Adewuyi Y G Sakyi N Y | 2013 | Industrial&Engineering Chemistry Research2013，52，11： | 1 |
| 18 | A new modification of the sample introduction system for Os isotope ratio measurements显示文摘 | Jin X D Du A D Li W J Xiang P Sakyi P A Zhang L C | | 0，，： | 1 |
| 19 | U-Pb ages and Hf-O isotopes of zircons from Late Paleozoic mafic ultramafic units in the southern Central Asian Orogenic Belt:Tectonic implications and evidence for an Early-Permian mantle plume显示文摘 | Su Benxun Qin Kezhang Sakyi P A Li Xianhua Yang Yueheng Sun He Tang Dongmei Liu Pingping Xiao Qinghua Malaviarachchi S P K | | 0，，： | 1 |
| 20 | Association between adverse pregnancy outcome and imbalance in angiogenie regulators and oxidative stress biomarkers in gestational hypertension and pre- eclampsia显示文摘 | Turpin CA Sakyi SA Owiredu WK | 2015 | BMC Pregnancy Childbirth2015，15，： | 1 |
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