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Search Results: 1 - 10 of 104278 matches for " FuQin Zhang "
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Oxygen and hydrogen isotopic compositions of coexistent minerals of the Tasigake alkali granite pluton, northern Xinjiang: constraints upon the cause of18OD depletion and the18O/16O exchange kinetics
Wei Liu,Zhenhua Zhao,Fuqin Zhang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02886131
Abstract: Oxygen and hydrogen isotopic compositions have been determined of three coexistent mineral triplets of alkali feldspar, quartz, arfvedsonite of 11 samples collected from the Tasigake alkali granite pluton, Ulungur River region, northern Xinjiang. Isotopic exchange with meteoric water during subsolidus cooling caused strong18O-D depletion and the remarkable nonequilibrium18O/16O relation between coexistent minerals.18O/16O exchange kinetic effects of the three minerals are simultaneously and consistently modelled. Exsolution and microtextural reorganization of alkali feldspar, and infiltration of water have been mutually facilitated by each other. Shallow intrusion, and circulation of meteoric water throughout the pluton cool it effectively. As a result, the “heat engine” is rapidly extinguished, and the nonequilibrium18O/16O relation is frosen.
Oxygen and hydrogen isotopic compositions of coexistent minerals of the Tasigake alkali granite pluton, northern Xinjiang: constraints upon the cause of ~(18)O-D depletion and the ~(18)O/~(16)O exchange kinetics

Wei Liu,Zhenhua Zhao,Fuqin Zhang,

科学通报(英文版) , 1999,
Abstract: Oxygen and hydrogen isotopic compositions have been determined of three coexistent mineral triplets of alkali feldspar, quartz, arfvedsonite of 11 samples collected from the Tasigake alkali granite pluton, Ulungur River region, northern Xinjiang. Isotopic exchange with meteoric water during subsolidus cooling caused strong18O-D depletion and the remarkable nonequilibrium18O/16O relation between coexistent minerals.18O/16O exchange kinetic effects of the three minerals are simultaneously and consistently modelled. Exsolution and microtextural reorganization of alkali feldspar, and infiltration of water have been mutually facilitated by each other. Shallow intrusion, and circulation of meteoric water throughout the pluton cool it effectively. As a result, the “heat engine” is rapidly extinguished, and the nonequilibrium18O/16O relation is frosen.
Zircon SHRIMP U-Pb dating for gabbro at Chaotiehe in the Haicheng area, eastern Liaoning
LaiCheng Miao,FuQin Zhang,DunYi Liu,YuRuo Shi,HangQiang Xie
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-009-0404-z
Abstract: Chaotiehe gabbroic intrusion in the eastern part of Liaoning Province was dated by the zircon SHRIMP U-Pb technique. The results gave an emplacement age of 126±4 Ma, indicating that the intrusion thus formed during the lithospheric thinning of the North China Craton (NCC) in the Early Cretaceous rather than in a rifting setting during the Paleoproterozoic as previously thought. The gabbroic intrusion contains abundant old zircons with Paleoproterozoic (2.10–2.46 Ga and ca. 1.87 Ga) and Neoproterozoic (747–969 Ma) ages. The Paleoproterozoic zircons were probably derived from NCC itself, whereas the Neoproterozoic ones were likely from materials of the Yangtze Craton that had previously been subducted beneath NCC. These geochronological dates are of important implications for understanding the Mesozoic crustal evolution of NCC.
Evidence of Nd isotope for unhomogeneity and origin of upper mantle of North China platform
Jianzhong Liu,Ziyuan Ouyang,Fuqin Zhang,Shijie Wang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885547
Abstract: Based on isptopic age of Sm-Nd and its initial composition and its evolution obtained during the recent years of archean metamorphic magnesio-ferro the vocanics of upper mantle of the North China platform, it is concluded that the isotopic composition of Archean upper mantle of the North China platform is not homogeneous, and values of IND don not change regularly through the whole Archean; in contrast, they present obvious differences in different regions. All this demands that the unhomogeneity of Archean upper mantle of the North China platform inherits initial unhomogeneity of origin, and the origin of the North China platform should contribute to uneven accumulation of planetesimals.
Paleomagnetism of early Paleozoic volcanic rocks from the Beishan area, Gansu of northwest China: Preliminary insight into early Paleozoic kinemics of the Beishan terrane
Baochun Huang,Yongcheng Wang,Rixiang Zhu,Fuqin Zhang
Chinese Science Bulletin , 2002, DOI: 10.1360/02tb9344
Abstract: We report rock magnetic and paleomagnetic results for Middle Silurian Gongpoquan and Middle Ordovician Huaniushan volcanic samples collected from the Mazongshan and Hongliuyuan areas of Gansu Province, north-west China. The results indicate that the main magnetic mineral of the Gongpoquan and Huaniushan volcanic rock is magnetite, and it may remain characteristic remanent magnetization acquired at the time of formation of the rocks. However, with the exception of samples from site go20, most of Middle Ordovician Huaniushan volcanic samples have a very weak nature remanent magnetization, and generally show an erratic demagnetization behavior, which does not allow isolation of characteristic remanent magnetizations from these samples. Comparison of paleomagnetic results obtained from the Beishan area of Gansu with Paleozoic apparent polar wander paths for Tarim and Siberia suggests that the Beishan tarrane, the southern part of the Beishan area of Gansu beyond the Mingshui-Shipanjin-Xiaohuangshan zone, and adjacent Tarim block and Siberia plate could not have been connected in their present configuration by the Middle Silurian time. On the other hand, we infer that the early Paleozoic Mingshui-Shipanjin-Xiaohuangshan oceanic basin may open from west to east during period from the Ordovician to Silurian, and the post-Middle Silurian closing of this oceanic basin may result from a progressed eastward scissor-like rotation
Oxygen isotopic (17O-18O) heterogeneity in Archaean continental nucleus, North China Craton
Jianzhong Liu,Fuqin Zhang,Chunlai Li,Shijie Wang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885936
Abstract: The oxygen isotopic data for amphibolites from Archaean continental nucleus, North China Craton indicate that ( i ) the evolving lines structured by the data are parallel to the geoselenic evolving line, which means that the parent materials of these continental nucleus originated from solar matter; ( ii ) different intercepts for these evolving lines manifest that oxygen isotopic compositions of different continental nucleus are heterogeneous, which means that these continental nucleuses originated from different parent resources with different original compositions.
Evidence of Nd isotope for unhomogeneity and origin of upper mantle of North China platform

Jianzhong Liu,Ziyuan Ouyang,Fuqin Zhang,Shijie Wang,

科学通报(英文版) , 1999,
Abstract: Based on isptopic age of Sm-Nd and its initial composition and its evolution obtained during the recent years of archean metamorphic magnesio-ferro the vocanics of upper mantle of the North China platform, it is concluded that the isotopic composition of Archean upper mantle of the North China platform is not homogeneous, and values of IND don not change regularly through the whole Archean; in contrast, they present obvious differences in different regions. All this demands that the unhomogeneity of Archean upper mantle of the North China platform inherits initial unhomogeneity of origin, and the origin of the North China platform should contribute to uneven accumulation of planetesimals.
SHRIMP zircon U-Pb dating of the Gangou granitoids, Central Tianshan Mountains, Northwest China and tectonic significances
Shi Yuruo,Liu Dunyi,Zhang Qi,Jian Ping,Zhang Fuqin,Miao Laicheng,
SHI
,YuRuo,LIU,DunYi,ZHANG,Qi,JIAN,Ping,ZHANG,FuQin,MIAO,LaiCheng

科学通报(英文版) , 2007,
Abstract: Two types of granitoids, highly deformed augen granitoids and undeformed fine-grained granitoids, are widely distributed in Gangou area, Central Tianshan Mountains, Northwest China. The augen granitoids are high-K calc-alkaline characterized by high K2O, Rb, Y and Th, and low Sr and Sr/Y. They also have high contents of large ion lithophile elements (LILE), such as Ba, Rb, K and Th, and relatively low contents of high field strength elements (HFSE), such as Zr, Y and Nb. The fine-grained granitoids are calc-alkaline characterized by high Sr, low Y and HREE, similar to adakitic rocks, and with Na2O/K2O<2 (1.76–1.91), high I Sr (0.70689–0.70981), and negative ε Nd(t) ( 2.4– 5.3). High-precision SHRIMP U-Pb zircon dating results indicate that the Gangou augen granitiods were formed at 428 ±10 Ma, and the fine-grained granitoids were emplaced at 361–368 Ma. These geochemical and U-Pb zircon data have significant implications for the timing of closure of the Mishigou-Gangou Ocean and the evolution of the Central Tianshan orogenic belt. Supported by the National Natural Science Foundation of China (Grant Nos. 40234045 and 40473030)
Life span of blow-up solutions for higher-order semilinear parabolic equations
Fuqin Sun
Electronic Journal of Differential Equations , 2010,
Abstract: In this article, we study the higher-order semilinear parabolic equation $$displaylines{ u_t+(-Delta)^m u=|u|^p, quad (t,x)in mathbb{R}^1_+ imes mathbb{R}^N,cr u(0,x)= u_0(x),quad xin mathbb{R}^N. }$$ Using the test function method, we derive the blow-up critical exponent. And then based on integral inequalities, we estimate the life span of blow-up solutions.
Zircon SHRIMP U-Pb ages of the “Xinghuadukou Group” in Hanjiayuanzi and Xinlin areas and the “Zhalantun Group” in Inner Mongolia, Da Hinggan Mountains
MIAO LaiCheng,LIU DunYi,ZHANG FuQin,FAN WeiMing,SHI YuRuo,XIE HangQiang,
MIAO
,LaiCheng,LIU,DunYi,ZHANG,FuQin,FAN,WeiMing,SHI,YuRuo,XIE,HangQiang

科学通报(英文版) , 2007,
Abstract: A report is presented of SHRIMP zircon U-Pb dating data of meta-igneous and meta-sedimentary rocks of the Xinghuadukou Group (Xinlin-Hanjiayuanzi area, Heilongjiang Province) and meta-volcanic rocks of the Zhalantun Group (Zhalantun district, Inner Mongolia). The SHRIMP analyses show that the meta-igneous rocks from the Xinghuadukou Group formed at 506±10–547±46 Ma, belonging to Early-Middle Precambrian, whereas the meta-sedimentary rocks yielded detrital zircons, with ages of 1.0–1.2, 1.6–1.8 and 2.5–2.6 Ga, indicative of deposition age at least <1.0 Ga. Meta-basic volcanic rocks from the Zhalantun Group have a formation age of 506±3 Ma. These data suggest that both the Xinghuadukou and Zhalantun Groups formed during Cambrian and/or Neoproterozoic time, rather than Paleoproterozoic time as previously thought. Early Precambrian inherited zircons in the meta-igneous rocks and numerous Precambrian detrital zircons in the meta-sedimentary rocks imply that these rocks were formed proximal to older crust. It is inferred that the Xinghuadukou and Zhalantun Groups represent Cambrian and/or Neoproterozoic volcano-sedimentary sequences formed in an active continental margin setting. Supported by the National Natural Science Foundation of China (Grant Nos. 40473030 and 40234045), the Chinese Academy of Sciences (Grant No. KZCX2-104) and the Key Laboratory Mineral Resources, Chinese Academy of Sciences
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