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| 1 | Geochronology, Geochemistry and Tectonic Significance of the Early Carboniferous Gabbro and Diorite Plutons in West Ujimqin, Inner Mongolia显示文摘Early Carboniferous gabbros and diorites are distributed in West Ujimqin, Inner Mongolia. The LA-ICP-MS zircon U-Pb ages of the gabbro and diorite samples are 321± 2 Ma(MSWD=0.65) and 319.4± 1.5 Ma(MSWD=0.42), respectively. In addition, new geochemistry data from three gabbro and three diorite samples are presented. All six samples show high Al_2O_3 contents but low-TiO_2 contents, belonging to tholeiitic and calc-alkali basalt series. All of the samples have similar chondrite normalized REE patterns characterized by moderate depletion in LREE similar to normal middle oceanic ridge basalt(MORB). The MORB and PM-normalized trace element patterns show the enrichment in large ion lithophile elements(LILE, e.g., Rb, Ba and Sr), depletion in high field strength elements(HFSE) and distinctly negative Nb and Ta anomalies similar to volcanic arc basalt. Furthermore, as shown in the correlation plots of La/Ba vs. La/Nb, Ba/La vs. Ce/Pb, Th/La vs. Ce/Pb, Nb/La vs. Ba/Rb, and Nb/Y vs. La/Yb, the magma source has underwent contamination and metasomatism from the subduction fluid. According to the Zr/Nb, La/Nb, and La/Ta ratios and the Nb/Y vs. Zr/Y and Sm/Yb vs. La/Sm diagrams, the magma was derived from shallow depleted lithospheric mantle and formed by moderate(5%~20%) partial melting of spinel lherzolites. Tectonic setting discrimination diagrams reveal that the gabbros and diorites display both characteristics of MORB and volcanic arc basalt, which is consistent with their geochemical characteristics. On the basis of the geochemical features of these samples, combined with regional geological data and many previous researches in the study area, the Early Carboniferous gabbros and diorites of West Ujimqin are suggested to be formed in an intensely extensional rift setting, and a limited immature ocean basin probably formed after subsequent development. | Shiwei Ma Changfeng Liu Zhiqin Xu Zhiguang Zhou Jinyuan Dong Hongying Li | 2017 | Journal of Earth Science2017，28，2： | 10 |
| 2 | A higher order lattice BGK model for simulating some nonlinear partial differential equations显示文摘In this paper, we consider a one-dimensional nonlinear partial differential equation that has the form ut + αuux + βunux - γuxx + δuxxx = F(u). A higher order lattice Bhatnager-Gross-Krook (BGK) model with an amending-function is proposed. With the Chapman-Enskog expansion, different kinds of nonlinear partial differential equations are recovered correctly from the continuous Boltzmann equation. The numerical results show that this method is very effective. | LAI HuiLin MA ChangFeng | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，7： | 3 |
| 3 | THE ALTERNATING DIRECTION METHODS FOR SOLVING THE SYLVESTER-TYPE MATRIX EQUATION AXB + CXTD = E显示文摘 | Yifen Ke Changfeng Ma | 2017 | Journal of Computational Mathematics2017，35，5： | 2 |
| 4 | Rice(Oryza sativa L.)seedlings enriched with zinc or manganese:Their impacts on cadmium accumulation and expression of related genes显示文摘Cadmium(Cd)contamination in paddy soils means that the rice produced there may be unsafe for human consumption.A hydroponic study was conducted to enrich rice seedlings with zinc(Zn)or manganese(Mn),and the uptake and transport characteristics of Cd in these Zn-and Mn-rich seedlings were subsequently investigated using a greenhouse pot trial.The results showed that hydroponic cultivation in 10-50μmol L^(-1) Zn(ZnSO_(4)·7 H_(2)O)or50-250μmol L^(-1) Mn(MnSO_(4)·H_(2)O)for 30 d had no significant impact on rice growth,while the accumulation of Zn and Mn was 7.31-18.5 and 25.4-47.7 times higher,respectively,than in the control(no Zn or Mn addition).The accumulation of Cd in the Zn-and Mn-rich rice plants was 26.3%-38.6% and 34.4%-44.5% lower than that in the control,respectively,and the translocation factors of Cd from roots to shoots also decreased by 23.3%-41.3% and 25.3%-37.0%,respectively,after transplanting to Cd-contaminated soils.Furthermore,the relative expression levels of OsIRT1(Oryza sativa iron-regulated transporter 1)were downregulated by 40.1%-59.3% and 16.0%-25.9%,respectively,in the Zn-and Mn-rich seedling roots.This downregulation may indicate a possible mechanism contributing to the reductions in Cd absorption.Field experiments confirmed that the Zn-and Mn-rich seedlings produced brown rice(unpolished rice grains)with significantly decreased concentrations of Cd(34.2%-44.4%).This study provides an innovative method for reducing the food safety risks from rice grown on slightly to moderately Cd-contaminated paddy soils. | Gaoxiang HUANG Changfeng DING Yibing MA Yurong WANG Zhigao ZHOU Shun'an ZHENG Xingxiang WANG | 2021 | Pedosphere2021，31，6： | 2 |
| 5 | Carboniferous ridge subduction in the Xingmeng Orogenic Belt:Constraints from geochronological,geochemical,and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent显示文摘The Xingmeng Orogenic Belt evolved through a long-lived orogeny involving multiple episodes of subduction and accretion.However,there is a debate on its tectonic evolution during the Late Paleozoic.Here,we report geochemical,geochronological,and isotopic data from strongly peraluminous granites and gabbro-diorites from the Sunidzuoqi-Xilinhot region.Zircon U-Pb ages suggest that the intrusive rocks were emplaced during the Early Carboniferous(333-322 Ma).The granites exhibit geochemical characteristics similar to S-type granites,with high SiO_(2)(72.34-76.53 wt.%),Al_(2)O_(3)(12.45-14.65 wt.%),and A/CNK(1.07-1.16),but depleted Sr,Nb,and Ta contents.They exhibit positiveε_(Nd)(t)andε_(Hf)(t)values(-0.3 to 2.8 and 2.7-5.7,respectively)and young Nd and Hf model ages(T_(DM2)(Nd)=853-1110 Ma and T_(DM2)(Hf)=975-1184 Ma),suggesting that they may be the partial melting products of heterogeneous sources with variable proportions of pelite,psammite,and metabasaltic rocks.The meta-gabbro-diorites from the Maihantaolegai pluton have low SiO_(2)(47.06-53.49 wt.%)and K_2O(0.04-0.99 wt.%)contents,and demonstrate slight light rare earth element(REE)depletion in the chondritenormalized REE diagrams.They have high zirconε_(Hf)(t)values(14.41-17.34)and young Hf model ages(T_(DM2)(Hf)=230-418 Ma),indicating a more depleted mantle source.The variations of the Sm/Yb and La/Sm ratios can thus be used to assess the melting degree of the mantle source from 5%to 20%,suggesting a quite shallow mantle melting zone.We propose that the petrogenesis and distribution of the strongly peraluminous granites and gabbro-diorites,as well as the tectonic architecture of the region,can be explained by a ridge subduction model.Based on these results,and previous studies,we suggest a southward ridge subduction model for the Sunidzuoqi-Xilinhot region. | Changfeng Liu Zhiguang Zhou Guosheng Wang Chen Wu Hongying Li Shiwei Ma | 2021 | Geoscience Frontiers2021，12，3： | 2 |
| 6 | Lower-dimensional linear complementarity problem approaches to the solution of bi - obstacle problem显示文摘 | Ma Changfeng Jiang Lihua | 2007 | Applied Mathematics and Computation2007，190，： | 1 |
| 7 | The convergence of a smoothing damped Gauss-Newton method for nonlinear complementarity problem显示文摘 | Ma Changfeng Jiang Lihua | 2008 | Analysis :Real World Applications2008，177，： | 1 |
| 8 | Some research on Levenberg - Marquardt method for the nonlinear equations 显示文摘 | Ma Changfeng Jiang Lihua | 2007 | Applied Mathematics and Computation2007，184，： | 1 |
| 9 | A globally convergent Levenberg-Marquardt method for the least 12-norm solution of nonlinear inequalities 显示文摘 | Ma Changfeng | 2008 | Applied Mathematics and Computation2008，，206： | 1 |
| 10 | Applied research of fracture for brass in extra-low cycle inverse rotating bending fatigue 显示文摘 | Li Youtang Yan Changfeng Ma Ping | 2005 | Key Engineering Materials2005，298，2： | 1 |
| 11 | The convergence of a one-step smoothing Newton method for Po-NCP based on a new smoothing NCP-function 显示文摘 | Ma Changfeng Chen Xiaohong | 2008 | Journal of Computa- tional andApplied Mathematics2008，216，1： | 1 |
| 12 | Direct H-He chemical association in superionic FeO_(2)H_(2)He at deep-Earth conditions显示文摘Hydrogen and helium are known to play crucial roles in geological and astrophysical environments;however,they are inert toward each other across wide pressure-temperature(P-T)conditions.Given their prominent presence and influence on the formation and evolution of celestial bodies,it is of fundamental interest to explore the nature of interactions between hydrogen and helium.Using an advanced crystal structure search method,we have identified a quaternary compound FeO_(2)H_(2)He stabilized in a wide range of P-T conditions.Ab initio molecular dynamics simulations further reveal a novel superionic state of FeO_(2)H_(2)He hosting liquid-like diffusive hydrogen in the FeO_(2)He sublattice,creating a conducive environment for H-He chemical association,at P-T conditions corresponding to the Earth’s lowest mantle regions.To our surprise,this chemically facilitated coalescence of otherwise immiscible molecular species highlights a promising avenue for exploring this long-sought but hitherto unattainable state of matter.This finding raises strong prospects for exotic H-He mixtures inside Earth and possibly also in other astronomical bodies. | Jurong Zhang Hanyu Liu Yanming Ma Changfeng Chen | 2022 | National Science Review2022，9，7： | 1 |
| 13 | Superlinear/quadratic smoothing Broyden-like method for the generalized nonlinear complementarity problem显示文摘 | Chen Bilian Ma Changfeng | 2011 | Nonlinear Anal: Real World Appl2011，12，： | 1 |
| 14 | A smoothing Levenberg-Marquardt al- gorithm for solving a class of stochastic linear complimentarily problem显示文摘 | Xie Yajun Ma Changfeng | 2011 | Applied Mathematics and Computation2011，217，9： | 1 |
| 15 | Lattice BGK simulations of double diffusive natural convection in a rectangular enclosure in the presences of magnetic field and heat source 显示文摘 | Ma Changfeng | 2009 | Nonlinear Analysis : Real World Applications2009，10，： | 1 |
| 16 | The convergence of a onestep smoothing Newton method for P0-NCP based on a new smoothing NCP-function显示文摘 | MA Changfeng CHEN Xiaohong | 2008 | Journal of Computational and Applied Mathematics2008，216，： | 1 |
| 17 | Some research on Levenberg -Marquardt method for the nonlinear equations 显示文摘 | Ma Changfeng Jiang Lihua | 2007 | Applied Mathematics and Computation2007，184，： | 1 |
| 18 | Experimental and simulation of single equilibrium stage separation of (methane + hydrogen) mixtures via forming hydrate显示文摘 | SUN Changyu MA Changfeng CHEN Guangjin | 2007 | Fluid Phase Equilibria2007，261，12： | 1 |
| 19 | The Convergence of a One-step Smoothing Newton Method for P0-NCP Based on a New Smoothing NCP-funetion显示文摘 | Ma Changfeng Chen Xiaohong | 2008 | Computational and Applied Mathematics2008，216，： | 1 |
| 20 | A note on modified Householder iterative method free from second derivatives for nonlinear equations显示文摘 | Chen Bilian Ma Changfeng | 2008 | Applied Mathematics and Computation2008，203，2： | 1 |
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