Xi X.,China Geological Survey |
Yang Z.,China University of Geosciences |
Cui Y.,Heilongjiang Institute of Geological Survey |
Sun S.,Jilin Institute of Geological Survey |
And 2 more authors.
Geoscience Frontiers | Year: 2011
Employing the Unit Soil Carbon Amount (USCA) approach, soil carbon storage was calculated across the Northeast Plain of China based on the Multi-purpose Regional Geochemical Survey conducted in 2004-2006 (MRGS). The results indicated that the soil organic carbon (SOC) storage in topsoil (0-0.2 m), subsoil (0-1 m) and deep soil (0-1.8 m) was 768.1 Mt, 2978.4 Mt and 3729.2 Mt with densities of 3327.8 t/km2, 12,904.7 t/km2 and 16,157.5 t/km 2, respectively. These values were consistent with national averages, whereas the soil carbon densities showed a clear increasing trend from the southern area of the Northeast Plain (Liaoning), to the middle (Jilin) and the northern Plain (Heilongjiang) - particularly in terms of topsoil carbon density, which increased from 2284.2, to 3436.7 and 3861.5 t/km2, respectively. In comparison to carbon data obtained from the Second National Soil Survey in 1984-1986 (SNSS), the topsoil SOC storage values from the MRGS were found to have decreased by 320.59 Mt (29.4%), with an average annual decline of 16.0 Mt (l.73%) over the 20 years. In the southern, middle and northern areas of the plain, soil carbon densities decreased by 1060.6 t/km 2, 1646.4 t/km2 and 1300.2 t/km2, respectively, with an average value of 1389.0 t/km2 for the whole plain. These findings indicate that the decrease in soil carbon density varied according to the different ecosystems and land-use types. Therefore, ratios of soil carbon density were calculated in order to study the carbon dynamic balance between ecosystems, and to further explore distribution characteristics, as well as the sequestration potential of SOC. © 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.
Liu L.S.,Bureau of Geology and Mineral Exploration of Liaoning Province |
Liu W.B.,Liaoning Institute of Geological Survey |
Zhan H.-R.,Shenyang University of Chemical Technology |
Wang L.P.,Shenyang University of Chemical Technology
Applied Mechanics and Materials | Year: 2014
With the boron-containing slag separated from ludwigite in the 13m3 blast furnace as crude material, cooling experiments in practice are fulfilled, where reasonable boron-containing slag cooling technic and industrial cooling installation conditions in industrial practice are obtained. Relationship between cooling rate and extraction rate of boron is observed. That is, as long as cooling rate keeps below 2°C/min in the temperature range of 1200~900°C, average boron extraction rate increases with the rise of cooling rate in the temperature range of 1500~1200°C and could reach up to 80%. This result is coincided with that of laboratory research. The experimental result demonstrates that twin zone cooling technology could be fulfilled in practice. Meanwhile, the way for the future cooling equipments design is pointed out. This study has scientific values for both practice and theory on multipurpose utilization of mineral resources. © (2014) Trans Tech Publications, Switzerland.
Zhong M.-S.,Liaoning Institute of Geological Survey |
Liu Y.,Heilongjiang Fifth Institute of Geological Exploration |
Wang Z.-J.,Liaoning Institute of Geological Survey |
He Z.-Q.,Liaoning Institute of Geological Survey |
And 2 more authors.
Northwestern Geology | Year: 2013
Based on the principles of sedimentology, coal geology and paleogeography, the paper studied the lithologic characteristics of rocks in Jianshan formation, including color, structure and primary sedimentary structures. Combined with spatial configuration research and geological maps, the group identified two sendimentary facies from Jianshan formation, namely littoral facies and neritic facies, where littoral facies can be subdivided into sediment subfacies of sandy coast without barrier and the barrier island - lagoon sediment subfacies. The barrier island - lagoon subfacies of semi-restricted bay formed in 2nd layer of 2nd section in Jianshan formation, mesoproterozoic erathem Changcheng system is the main environment of manganese mineralization in the studied area, controlling the formation and distribution of manganese. During the process of mineralizing, the sea was shallow and the sedimentary environment was stable, which was advantageous to the enrichment of manganese oxide ore. Consequently, a set of layered or stratiform-like oxidized manganese deposits was formed" with major ores being pyrolusite, psilomelane and limonite. After metallogenesis, regional metamorphism took place under the effect of the dynamic force and heat, transferring the hematite into magnetite. The mineral composition is thus rearranged with obvious banded structure. The surrounding rock of seam roof and floor is silty slate, and the genetic type is marine sedimentary-metamorphose Mn deposit.