Yin Z.,Kunming Institute of Exploration |
Zhao M.,Kunming Institute of Exploration |
Tang F.,Kunming Institute of Exploration |
Sun H.,Kunming Institute of Exploration |
Peng H.,CAS Kunming Institute of Botany
Nordic Journal of Botany | Year: 2017
Sorbus cibagouensis sp. nov. (Rosaceae subfam. Rosaceae), a new taxon from Cibagou National Nature Reserve, Zayü County, southeastern Xizang (Tibet), China, is described and illustrated. It is related to S. monbeigii (Cardot) Balakr., but primarily differs in the number of styles (S. cibagouensis = 5; S. monbeigii = 4) and the shape of stipules and leaves (S. cibagouensis: stipules caducous, small, with entire margin, leaflets in 9-11 pairs; S. monbeigii: stipules persistent, large, serrate, leaflets in 6-8 (-10) pairs). © 2016 Nordic Society Oikos.
PubMed | Vietnam Academy of Science and Technology, Tunghai University, Sichuan Academy of Forestry, Kunming Institute of Exploration and 2 more.
Type: Journal Article | Journal: BMC evolutionary biology | Year: 2016
Niviventer is a genus of white-bellied rats that are among the most common rodents in the Indo-Sundaic region. The taxonomy of the genus has undergone extensive revisions and remains controversial. The current phylogeny is unresolved and was developed primarily on the basis of mitochondrial genes. Identification is extremely difficult, and a large number of GenBank sequences seem to be problematic. We extensively sampled specimens of Niviventer in China and neighboring northern Vietnam, including topotypes of the most reported species (n=6), subspecies (n=8), and synonyms (n=4). We estimated phylogenetic relationships on the basis of one mitochondrial and three nuclear genes, using concatenation and coalescent-based approaches. We also employed molecular species delimitation approaches to test the existence of cryptic and putative new species.Our phylogeny was finely resolved, especially for the N. confucianus-like species. Our data provided the first support for N. brahma and N. eha as sister species, an assignment that is congruent with their morphological similarities. Species delimitation analyses provided new insight into species diversity and systematics. Three geographic populations of N. confucianus and one of N. fulvescens were supported as genetically distinct in our species delimitation analyses, while three recognized species (N. coninga, N. huang, and N. lotipes) were not strongly supported as distinct.Our results suggested that several genetically distinct species may be contained within the species currently known as N. confucianus and N. fulvescens. In addition, the results of Bayesian Phylogenetics and Phylogeography (BPP) for N. coninga, N. huang, and N. lotipes indicated that either inter-specific gene flow had occurred or imperfect taxonomy was present. Morphological examinations and morphometric analyses are warranted to examine the molecular results.
Shu X.-F.,China University of Geosciences |
Shu X.-F.,Geological and Mineral Exploration Academy of Qinghai Province |
Wang X.-P.,Qinghai Province Nuclear Industry Geology Bureau |
Wang X.-P.,Xian Institute of Geology and Mineral Resources |
And 2 more authors.
Northwestern Geology | Year: 2012
Qimantag metallogenic belt is very important copper-polymetallic metallogenic beltin Qinghai. Copper-lead-zinc deposits in the Hutouya area composed of Hutouya and Yingqinggou deposit. The deposit prospecting has made great progress in recent years, but the genetic types of deposits remains controversial. Through detailed field observations, we collected evidence from different angles, and then determined two genetic types for the deposits: one belongs to hydrothermal deposit related to Triassic bodies, Tanjianshan group in Ordovician to Silurian, and Di'ao Formation in Late Carboniferous; the other related to Mesoproterozoic Langyashan Formation belongs to SEDEX-hydrothermal superimposition-transformation deposit. At the same time, ore-controlling factors were analyzed and prospecting criteria was established to guide the exploration.
Chen B.-Y.,Yunnan Nonferrous Metals Geological Bureau |
Liu H.-T.,Kunming Institute of Exploration |
Yang P.,Institute of Geology |
Sun Y.,Yunnan Nonferrous Metals Geological Bureau
Acta Geoscientica Sinica | Year: 2013
The global lateritic nickel ore deposits have distinct temporal and spatial distribution regularity, and the lateritic nickel ore bodies are characterized by apparent vertical zoning. The intensity of lateritic nickel mineralization is obviously influenced and controlled by the components of ore-forming parent rock (such as nickel content and lithogeochemical and mineral composition), climate, topography, hydrogeology, structural geology, duration of ore-forming process, and maturity of the weathering crust. Types of lateritic nickel ore deposits are mainly controlled by climate, tectonic setting and the state of structural uplift and also influenced by topography, drainage condition, lithology of ore-forming parent rock and its serpentinization.
Li J.-S.,Kunming Institute of Exploration |
Li G.-D.,Yunnan Nonferrous Metals Geological Bureau |
Zhang Y.-X.,Kunming Institute of Exploration |
Zhang X.-F.,Kunming Institute of Exploration |
Wang C.,Kunming Institute of Exploration
Acta Geoscientica Sinica | Year: 2013
Based on an analysis of ore-forming geological background and geological characteristics of the Shanmuqing Fe-Cu deposit in Dongchuan of Yunnan Province and using the information in such aspects as the metallogenic conditions of Fe-Cu deposit of Dongchuan model, the Xikuangshan model of the neighboring area, the dome structure, the gravity-magnetic anomaly, the geochemical anomaly and the mineralization, in combination with the newest results in geological exploration of Yunnan Province, the authors analyzed and studied the ore-prospecting potential of the exploration area. Considering that its metallogenic characteristics and geophysical-geochemical anomaly are similar to those of the Luoyin Fe-Cu ore belt, the authors delineated two gravity-magnetic anomaly belts of Linggongli-Xiaopo and Erbaier-Xinzhai and their nearly areas as prospecting targets. It is inferred that there exists great prospecting potential in search for middle-large ore bodies at the depth.
Zhang Z.,Zhejiang University |
Wu L.,Zhejiang University |
Wang R.,Kunming Institute of Exploration |
Zhang J.,Geological Exploration Technologies institute of Anhui Province
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013
The first kind of Fredholm integral equation in the downward continuation was solved by adopting conjugate gradient method with the assumption that the coefficient matrix is positive definite. The theoretical model test shows that downward continuation has a very fast convergence rate but suggests poor ability to compress the noise.compared with integral iteration method, conjugate gradient method indicates a faster convergence rate, as well as divergence rate, and is not so applicable. In order to acquire stable solutions the regularization of the operator of the ill-posed problem was carried out and the problem was transformed to solve the minimum value of the least squares estimations. After using the conjugate gradient method to solve the least squares problem, a method was implemented for downward continuation based on CGNR method that has a better ability to suppress noise. Model test demonstrates that this method has strong ability in restraining noise. This method convergence fast and has obvious computation advantage by a comparison with least square steepest descent method.
Zhang G.,China Institute of Water Resources and Hydropower Research |
Liu Y.,China Institute of Water Resources and Hydropower Research |
Xie M.,Kunming Institute of Exploration
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2012
This paper develops an adiabatic heat combined function model of high content fly-ash concrete based on laboratory tests and in-situ monitoring data. Using this model, a back analysis on the adiabatic heat parameters of concrete for an arch dam is conducted. Results show that the model can better simulate the actual heating process, particularly the one after closure grouting, and its fitting accuracy is higher than other models. An analysis on the negative impacts of temperature rise on the overall stress distribution of arch dam reveals that temperature rise after closure can deteriorate the local stress in the periods of initial impoundment and long-term operation, to which more attention should be paid.
Liu W.-Y.,Kunming Institute of Exploration |
Li W.-Q.,Kunming Institute of Exploration |
Cheng Y.-M.,Kunming Institute of Exploration
Acta Geoscientica Sinica | Year: 2013
The Tianshenqiao sedimentary bauxite is a medium-size bauxite, and is the best quality bauxite deposit with largest usable resource quantity ever discovered in Wenshan area. The ore body lies on the west limb of Tangzibian syncline and occurs in Permian Longtan Formation. The main minerals in the ore include diaspore, boehmite, anatase, pyrite, hematite, kaolin and mica, and the ores are mainly of pellet and psammitic textures. Based on an analysis of the ore-forming geological characteristics of Gantangzi and Tianhshenqiao ore blocks within the ore district, this paper points out that the Zhewushe ore block on the eastern limb of Tangzibian syncline has favorable ore-searching prospect and resource potential.
Yan J.-G.,Kunming Institute of Exploration |
Mo X.-Y.,Kunming Institute of Exploration |
Yang C.,Kunming Institute of Exploration |
Xue L.-P.,Kunming Institute of Exploration
Acta Geoscientica Sinica | Year: 2013
Based on summarizing geological features of the ore deposits and analyzing the metallogenic ingredients, this paper presents a new type of ore deposits in Dongchuan of Yunnan Province, i.e., 'Guanyinshan type' copper deposits. It is considered that these new type ore deposits are related to Dayingpan Formation of Kunyang Group in the study area. The discovery of the new type deposits has broken the metallogenic series and copper deposit types put forward by previous geologists. The authors hold that the new type of ore deposits should have wide prospecting potential in the study area.
Yang J.,Central South University |
Yang Y.,Central South University |
Yang Y.,Kunming Institute of Exploration |
Yan L.,Changsha University of Science and Technology |
And 4 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2012
Lijiachong large-span tunnel is excavated below the existing high-voltage transmission tower, and the risk of tunnel construction is very high. Several possible schemes for tunnel construction and foundation reinforcement of high-voltage transmission tower were presented based on risk analysis; and comparison among tunnel excavation using two-side wall drift heading method after mountain grunting consolidation, tunnel excavation using three bench method with the core of surrounding rock remained after tower foundation were reinforced with H-shaped framed girders, and tunnel excavation using three bench method with the core of surrounding rock remained after tower foundation were underpinned are introduced through a 3D numerical analysis of the interaction between tunnel construction and high-voltage transmission tower. The scheme of using H-shaped framed girders to connect the foundations as a whole is adopted. It is shown that after the pile foundations were connected with H-shaped framed girders, the foundations worked as a whole, tunneling using three bench method with the core of surrounding rock remained became safety. Cumulative settlement and uneven settlement were well controlled, and the forces and deformations of the tower were in the allowable ranges. By reinforcing the tower foundations using the H-shaped framed girders, Lijiachong tunnel safely passed beneath the transmission tower; and good economical and technical results are obtained. The results can provide a reference for similar projects.