Xi X.,China Geological Survey |
Li M.,China Geological Survey |
Zhang X.,Hebei Institute of Geological Survey |
Zhang Y.,Henan Institute of Geological Survey |
And 4 more authors.
Earth Science Frontiers | Year: 2013
Soil organic carbon in middle-east China can be studied by comparison based on the data obtained by multi-purpose regional geochemical survey. The middle-east plain covers the terrain of Hebei, Henan, Hubei, Hunan, Guangdong and Hainan provinces, ranging from relatively higher latitude to low latitude and crossing temperate zone, subtropical zone and tropical zone. More than 334000 km2 were covered in the multi-purpose regional geochemical survey. Top soil (0-0.2 m) carbon storage is 906.84 Mt and average carbon density is 2716.93 t/km2. Including the higher soil carbon density in the northeastern plain, the carbon density in middle-east regions of China exhibited the changing pattern of high low high low from the northeastern plain downward to Hainan Province, that is 3327.8 t/km2 (northeastern plain)→2207.39, 2421.02 t/km2 (Hebei and Henan)→3442.15, 3942.92 t/km2 (Hubei and Hunan)→2255.90, 2936.72 t/km2(Guangdong and Hainan). The soil carbon density in agricultural ecosystem and urban ecosystem presented different changing rule from higher latitude to lower latitude, i.e., in agricultural farmland it changes from low to high, and in urban soil from high to low. The soil organic carbon increased by 14.5% (totally increasing 115.18 Mt and annually averaging 5.76 Mt/a) during past 20 years compared to the value achieved by the second soil reconnaissance. However organic carbon did not increase evenly. The rising rate decreased from low latitude to high latitude, and organic carbon increased in agricultural and urban ecosystem but decreased in tideland, rivers, lakes, grassland, forest and swamp.
Ma Z.-S.,Hebei Institute of Geological Survey
Geology in China | Year: 2010
At present, the estimation of soil carbon reserves constitutes a basic problem in studying the global atmospheric carbon cycle. Based on soil carbon data obtained by multi-purpose geochemical survey in Hebei Province, the authors calculated the soil carbon reserves accurately according to soil types and land use classification so as to estimate soil carbon reserves in the southern plain of Hebei Province, with the adoption of the concept of unit carbon content in the GIS platform. The results show that the soil organic carbon reserves in the southern plain of Hebei Province come to 819402498 t, and their average soil organic carbon reserves are 13206.1 t/km2.
Wen S.,Jilin University |
Li B.-L.,Jilin University |
Li L.-B.,Hebei Institute of Geological Survey |
Wang B.,No. 5 Exploration Team of Hebei Geological and Prospecting Bureau
Chinese Journal of Ecology | Year: 2013
Nanquanyan diorite, hardly well-studied, is the metallogenic intrusion of the Lanjia skarn type gold deposit. Based on the studies of geochemistry, zircon LA-ICP-MS U-Pb data, this paper mainly discusses petrogenesis, magma source, tectonics setting of the diorite. Studies show that Nanquanyan diorite belongs to calc-alkaline and metaluminous series. The trace elements of diorite show enrichment in LILE (such as K, Rb, Sr), more mobile incompatible elements (such as Th, U) and LREE, relative depletment of HFSE (such as Nb, Ta, Ti, P) and HREE, and show obvious negative Eu anomalies (δEu= 0.19∼0.25). The ratios of Nb/Ta, La/Nb and Th/La indicate that the diorite mainly comes from the crust. In the Al2O3 + MgO+FeOt diagram, the characteristics of the diorite are similar to those of arc-type active continental margin magmatic rocks. LA-ICP-MS U-Pb zircon data of the diorite give weighted average ages of 170.21±0.73 Ma(MSWD=0.14) and concordant age of 170.21±0.39 Ma (MSWD = 0.018), which are in the middle Jurassic period. It is suggested that during the early Yanshan, subduction of Pacific plate led to extension of continental arc and lithospheric thinning, and asthenosphere mantle magma underplated subsequently and provided thermopower, finally partial melting of the immature lower crurst formed Nanquanyan diorite.
Wang H.,Wuhan University |
Wu Y.-B.,Wuhan University |
Wu Y.-B.,Northwest University, China |
Gao S.,Wuhan University |
And 8 more authors.
Lithos | Year: 2014
Accretionary orogenic belts are considered the most important sites for the generation of continental crust. However, it is still not very clear whether in such settings the continental crust has been significantly transported back to the mantle accompanied with its lateral growth. Continental UHP rocks, the best indicators of the recycling of the continental crust, have rarely been discovered in accretionary orogenic belts, which hinder the exploration of this essential process. The possible occurrence of early Paleozoic UHP metamorphism in the Qinling orogen provides an excellent opportunity to address this question. This article reports an integrated study of U-Pb age, trace element and mineral inclusion of zircon from an amphibolite sample in the Qinling orogen. The zircon crystals show typical metamorphic growth zoning, low Th/U ratios, flat HREE patterns, and insignificant Eu anomalies. They give a weighted mean U-Pb age of 490.4. ±. 5.8. Ma. Most importantly, an in situ diamond inclusion was identified from one of the zircon crystals. Therefore, the obtained 490.4. ±. 5.8. Ma age was taken as registering the peak UHP metamorphism. The discovery of in situ diamond inclusion provides important evidence for the UHP metamorphism of the Qinling orogen and indicates that the North Qinling microcontinent was subducted to mantle depths of >. 120. km when it collided with the Erlangping arc attached to the southern margin of the North China Block. Combining with previous results, we suggested that the North Qinling UHP terrane underwent fast exhumation from >. 120. km to ca. 30. km within 10. Myr intervals. As a few examples of UHP metamorphism have been discovered in some accretionary orogens, more attention needs to be paid to the occurrence of continental UHP metamorphism during accretionary orogenic process. Furthermore, evident crustal growth has been documented in the North Qinling orogen during the early Paleozoic. It is inferred that the accretionary orogenic belts may play important roles in recycling of continental crust into the mantle besides generation of continental crust. © 2014 Elsevier B.V.
Wang S.,China University of Geosciences |
Ye H.,China Academy of Geological science |
Yang Y.,China University of Geosciences |
Zhang X.,Hebei Institute of Geological Survey |
And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2016
The Huoshenmiao pluton located in the west of the Luanchuan ore district, southern margin of the North China Craton (NCC) is mainly composed of quartz diorite, monzo-granite and granite porphyry. The Huoshenmiao pluton is closely related to the Huoshenmiao Mo deposit. While the degree of research on the Huoshenmiao pluton is very low, which seriously restrict the understanding of the genesis of the Huoshenmiao Mo deposit. Three types of rock including quartz diorite, monzo-granite and granite porphyry has been researched by zircon U-Pb chronology, geochemistry and Hf isotope. The forming ages of quartz diorite, monzo-granite and granite porphyry are 150.3±0.6 Ma, 146.0±0.6 Ma and 145.1±0.5 Ma respectively, and are products of the second magmatism of the Luanchuan ore district, Late Jurassic. Geochemistry and zircon Hf isotope show that the Huoshenmiao pluton belongs to I-type granite, and it results from ascending magma formed by partial melting of different source regions. The quartz diorite stems from remelting of the enriched mantle, while the monzo-granite and granite porphyry are the products of mafic magma derived from remelting of the enriched mantle mixed with felsic magma derived from remelting of the Taihua TTG. © 2016, Editorial Department of Earth Science. All right reserved.
Jin S.,Hubei University |
Jin S.,Hebei Institute of Geological Survey |
Zhang Z.-Y.,Hebei Institute of Geological Survey |
Rong G.-L.,Hebei Institute of Geological Survey |
And 4 more authors.
Geology in China | Year: 2015
The Yushenkala pluton is located in the northern part of west Junggar Basin of Xinjiang and lies along the suture zone between Siberia plate and Junggar plate. Petrologically, the pluton consists of gabbro, homblende gabbro, diorite and quartz diorite which intruded in the middle Devonian Yudoukala Group. LA-ICP-MS zircon U-Pb dating shows that the age of the hornblende gabbro is 364±1Ma, which represents the formation age of the pluon. The εHf (t) values of the zircon are in the range of 4.3-11.5, with a weighted average of 9.0±1.2, suggesting that its original rock was derived from mantle materials. The one-stage Hf model ages (TDM1) are 529-827 Ma (629±95 Ma on average), indicating an original rock of Cambrian - Precambrian basement. Based on field geological and geochemical characteristics, the authors infer that the pluton formed in an island-arc environment or active epicontinental environment. In the late Devonian, the arc magmatism was well developed, and the ocean-continent subduction event basically came to an end in the northwestern part of western Junggar. These data indicate that the closing time of Paleo Asian ocean was not earlier than 364 Ma.
Jin S.,Hubei University |
Jin S.,Hebei Institute of Geological Survey |
Rong G.,Hebei Institute of Geological Survey |
Zhang Z.,Hebei Institute of Geological Survey
Geological Engineering and Mining Exploration in Central Asia - Proceeding Source: The XVIII Kerulien International Conference on Geology, KICG 2013 | Year: 2013
There are large-scale intermediate-acid intrusive rocks distributed in the north of western Junggar, Xinjiang Province. The rocks formed during late carboniferous to early Permian. The typical plutons include pyroxene diorite, quartz diorite and quartz monzomtic diorite. The Kuoyitasi intrusion is among one of them, with SiO2 contents of 52.40%-67.53%, high Al2O3 content (14.92%-17.85%) and Na contents, low K and MgO contents. Rittman values (δ) of the samples vary from 1.47 to 1.98, the FeOt/MgO values are between 1.01 and 1.69. The REE patterns are characterized by LREE enrichment and slight Eu anomalies with obvious fractionation between LREE and HREE. The geochemical characteristics suggest that the Kuoyitasi intrusion formed in a post-collisional extensional tectonic environment, and should be earlier than the collision time of east Junggar terran. The rocks were probably derived from partial melting of the lower crust which has been intruded by mafic magmas.
Chen J.,Beijing University of Technology |
Fu M.C.,Beijing University of Technology |
Wei J.,Hebei Institute of Geological Survey
Advanced Materials Research | Year: 2014
Based on the remote sensing image data of 1970, 1980, 1990, 2000 and 2008, the transfer matrix of land use/cover change were extracted using ArcGIS software, and the paper analyzed the spatial and temporal change of land use/cover change using barycenter transfer model. Results showed that: (1) From 1970 to 2008, cultivated land had been dominated land use type, followed by water area, construction land and unexploited land, and there was small proportion of forest land and grass land; forest land, water area, construction land and unexploited land were increased, and cultivated land and grass land were decreased; the conversions among cultivated land, water area and unexploited land were more closely. (2) The study on barycenter transfer model indicated that from 1970 to 2008, the barycenter transfer direction of cultivated land and construction land was north by west, and the barycenter transfer direction of forest land and unexploited land was south by west, and the barycenter transfer direction of grass land was south by east, with the maximum distance; and that of water area was north by east. © (2014) Trans Tech Publications, Switzerland.
Zhang H.Y.,Zhengzhou Technical College |
Bai L.,Zhengzhou Technical College |
Ma K.Y.,Hebei Institute of Geological Survey |
Song S.Z.,Hebei Institute of Geological Survey
Applied Mechanics and Materials | Year: 2013
SiC/Fe composite was prepared using electromagnetic stirring approach. The distribution of SiC particles in steel matrix was affected, in a different manner, by stirring power and stirring time in three test particle addition methods. When particles were blown from bottom of molten steel by airflow, the dispersion coefficient of particles was lower with reduced stirring power and prolonged stirring time. In contrast, when particles were dispersed directly by funnel or injected a block premade by particles and a small amount of matrix, the particle dispersion coefficient was increased following the decrease of stirring power or stirring time. This study provided a guidance of how to achieve a more uniform distribution of SiC particles in steel matrix. © 2013 Trans Tech Publications Ltd, Switzerland.
Guo H.-Q.,Hebei Institute of Geological Survey |
Yang Z.-H.,Hebei Institute of Geological Survey |
Li H.-L.,Hebei Institute of Geological Survey |
Ma W.-J.,Hebei Institute of Geological Survey |
Jren J.-F.,Hebei Institute of Geological Survey
Geology in China | Year: 2011
Soil environmental quality assessment is an important prerequisite for understanding its current status and carrying out environmental protection. The authors made an evaluation of environmental quality of heavy metals in topsoil of Hebei plain based on Environmental Quality Standard for Soils (GB15618-1995), and the results show that the quality is excellent, with the area that comes up to the first grade standard being 93.02% and up to the second being 6.62%. Making use of environmental geochemical behaviors of heavy metals, the authors applied enrichment factors to distinguish anthropogenic pollutions of heavy metals from natural anomalies in topsoil of Hebei Plain. It is concluded that the application of the enrichment factors to determining anthropogenic contamination of heavy metals in topsoil is practical. The anthropogenic pollution area of heavy metals is rather larger, but the pollution is mainly insignificant.