Peng Zicheng

University of Science and Technology of China, Hefei, Anhui Sheng, China

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Publications (9)12.21 Total impact

  • PENG Zicheng · LEUNG Po Lau · YU Peter · CHENG Peikai · LI Mai
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    ABSTRACT: The microprobe EDXRF equipment was used for analysis of the major and trace elements in glaze layer-transitive layer-body layer of the celadon from the Altar Yao (Kiln) and Laohudong Yao in the Southern Song Dynasty (1127–1279 A.D.), Zhejiang, China. The K values of the discriminant factor for the celadon wares are larger than 8, which means the celadon of the Altar Yao and Laohudong Yao are different from that of the Longquan Yao. The former two belong to the Guan Yao system (the Chinese imperial kilns), but the latter to the Min Yao system (the Chinese popular kilns). The principle component analysis shows their relationship between the Altar and Laohudong wares with provenance postulation. The thickness of the transitive layer in the Altar and Laohudong wares is obviously different, which reveals the microstructure characteristics of the celadon even though both kinds of wares belong to the imperial kiln system.
    No preview · Article · Sep 2010 · Acta Geologica Sinica
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    ABSTRACT: Climate variability during the Late Pleistocene is studied from the proxies in core CK-2 drilled from the Luobei Depression (91°03′E, 40°47′N), Lop Nur in the eastern Tarim Basin, Xinjiang, China. Geophysical and geochemical properties, including magnetic susceptibility, granularity, chroma, carbonate content, loss on ignition and trace elements, have been determined to reconstruct the environmental evolution of the area during 32–9 ka BP. The chronology is established by uranium–thorium disequilibrium dating techniques.Our data suggest four paleoclimate stages, indicating glacial variations between cold–humid and warm–arid environments. A period of extreme humidity occurred during 31,900–19,200yr BP is attributed the last glacial maximum (LGM). The period was followed by a warm–arid episode during 19,200–13,500 yr BP. Then a cold–humid interval during 13,500–12,700 yr BP may correspond to another cooling phases at high latitudes of the Northern Hemisphere. The last stage from 12,700 to 9000 yr BP has a trend that the climate turned warm and arid. The Lop Nur region is characterized by particularly humid stadials and arid interstadials. The climate variability in Lop Nur was constrained by global climate change because it is correlated with Dansgaard–Oeschger and Heinrich events, which were observed at the northern high latitudes. The synchroneity of the palaeoclimatic events suggested that cold air activity at the northern high latitudes was the most important factor that influenced the climate evolution in the Lop Nur region. A probable mechanism that involves the migration of westerly winds is proposed to interpret this synchroneity.
    No preview · Article · Jan 2009 · Journal of Asian Earth Sciences
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    ABSTRACT: China's economy has developed rapidly in the last two decades, leading to an increase in energy consumption and consequently emissions from energy generation. Coal is a primary energy source in China because of its abundance and will continue to be used in the future. The dominance of coal in energy production is expected to result in increasing levels of exposure to environmental pollution in China. Toxic trace elements emitted during coal combustion are the main sources of indoor air pollution. They are released into the atmosphere mainly in the forms of fine ash and vapors and have the potential to adversely affect human health. Those trace elements, which volatilize during combustion, are hazardous air pollutants (HAPs) and are particularly rich in Chinese coals. Among the HAPs, arsenic (As), fluorine (F), and selenium (Se) have already been identified as pollutants that can induce severe health problems. In this review, the geochemical characteristics of As, F, and Se, including their concentration, distribution, and mode of occurrences in Chinese coal, are documented and discussed. Our investigations have confirmed the current As- and F-induced epidemics in Guizhou (Southwest China) and Se epidemic in Hubei (Northeast China). In this study, diagnostic symptoms of arseniasis, fluorosis, and selenosis are also illustrated.
    No preview · Article · Feb 2007 · Reviews of environmental contamination and toxicology
  • Liu Guijian · Zheng Liugen · Wu Enjiang · Peng Zicheng
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    ABSTRACT: The sub-surface exploration carried out in Yayu coal field by China revealed four major lithologic units. These are the basement complex, lower basalt sedimentary rock unit and upper basalt from the older to the younger according to their position in stratigraphie sequence. The lacustrine and fluvitile types are observed in the Yayu coal field. The samples of coal seams are collected from the fresh coal seam in cored boreholes during coal field exploration stage. The proximate, total sulfur, calorific value and ultimate analysis and other chemical analysis were performed. X-ray diffraction (XRD) analysis were performed for coal, coal ash samples. Ashes and coal were identified to mineralogical and petrographic analysis using X-ray diffraction, optical microscopy, and electron microscopy. The laboratory analysis result of the coal samples helped to analyze the quality and rank, of the deposit. The result of the study district conclude that there are medium to high volatile, medium to high ash content and relatively, low to medium sulfur content.
    No preview · Article · Oct 2006 · Energy Exploration & Exploitation
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    ABSTRACT: Abstract The Yanzhou mine district, located in southwestern Shandong Province, is about 1300 km2 with more than 8times109 tons of proved coal reserves and there are 10 big power plants in this area. A large amount of coal ashes, which are regarded as waste materials, have been stockpiled in the area and have influenced the environment of the mine district. In this paper, analysis of fly ash samples from three power plants is carried out, the enrichment and concentration of trace elements, Pb, Zn, Cu and As, in coal ashes are analyzed, and petrological and mineralogical characteristics and chemical compositions of coal ashes are studied. The aim of this work is to provide basic scientific data for utilization of ashes and reduction of environmental pollutions.
    No preview · Article · May 2004 · Acta Geologica Sinica
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    ABSTRACT: Coral samples collected from the waters off the Leizhou Peninsula, the Hainan Island and the Yongxing Island of the Xisha Islands were analyzed by thermal ionization mass spectrometry (TIMS) and multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) for their U-Th systematics. Their uranium contents are mostly lower than 3μg/g, and the δ234U (T) values are within the range of 150 ±5. X-ray diffraction analysis showed that the corals are all composed of aragonite. This demonstrates that the corals determined have maintained a close system for 7000 years and their skeletons bear much information about the primitive tropical marine environment. The highly precise age sequence of the corals determined has revealed that there occurred three phases of high sea level in the South China Sea waters, which are dated at 6799-6307 a B. P., 4472-4285 a B. P. and 1279-1012 a B. P., respectively. The three phases lasted 492 a, 187 a and 267 a, respectively. These three phases of high sea level are corresponding to the warm environments that had appeared in China during the Megathermal Period and the Medieval Warm Period in the past ten thousand years.
    No preview · Article · Apr 2003 · Chinese Journal of Geochemistry
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    ABSTRACT: We have developed newly technique to measure 230Th abundance in corals by isotope dilution thermal ionization mass spectrometry (TIMS). This has alowed us to reduce significantly the counting statistics for U and Th isotopes and greatly reduce the sample size. So it is suggested that with high precision TIMS technique,the ages of coral from Barbados might be given. Five samples of coral have been analyzed with TIMS. The results of TIMS dating show that the ages of B-1, B-2 and B-3 are 129. 2±1. 2ka (Rendezvous Hill),125. 4±1. 1ka(Curacao + 6m)and 208. 1±1. 9ka B. P. (Kendal Hill),respectively, which corresponding to a high sea level of substage 5e and 7c of the oxygen isotope records from deep sea cores. The Rendezvous Hill and Curacao ages are the same as those reported by Edwards et al. For five samples, the agreement between the ages determined by TIMS and the previously ages determined by α-counting is generally good within the error limits. The error in age,based on analytical errors,for the TIMS measurement is about ten times smaller than the error in age for the α-spectrometric measurement. The results of this study suggest that the change in isotopic compositions for the high precise analysis is probably from post-depositional alteration. It would not be detected by thin section or x-ray diffraction examination,because higher initial uranium isotope ratios were obtained from samples that met criteria for reliable ages as discussed previously. However, improvement the identify and tests level of the minerals are adequate for obtained reliable ages of TIMS.
    No preview · Article · Jan 1999 · Scientia Geologica Sinica
  • Wang Zhaorong · Peng Zicheng · Ni Shoubin · Sun Weidong · Ma Zhibang
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    ABSTRACT: Spelean stalagmite dating using thermal ionization mass spectrometry (TIMS) on the basis of U-Th disequilibrium has contributed greatly to paleoclimatology, paleo-environment, paleo-oceanology, archaeology as well as modern volcano-magmatism studies. Results of our studies on stalagmite chronology are also reported in this paper.
    No preview · Article · Dec 1998 · Chinese Journal of Geochemistry
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    ABSTRACT: Two national stalagnlite standards (GBW04412, GBW04413) and one international coral standard (RKM-4) have been determined by using thcrmal ionization mass spcctrometry (TIMS) method. The values of (234U/238U)act, (230Th/234U)act and age are all consistent in error range with thc stantlard values obtained by using α spectrometry.
    No preview · Article · Feb 1998 · Chinese Science Bulletin