scholarly journals Sulfide S and Pb Isotopic Constraint on the Genesis of Diyanqinamu Mo-Pb-Zn Polymetallic Deposit, Inner Mongolia, China

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 304
Author(s):  
Hairui Sun ◽  
Zhilong Huang ◽  
Zhicheng Lü ◽  
Xiaofei Yu ◽  
Yongsheng Li
Keyword(s):  
Middle Part ◽  
Linear Distribution ◽  
Isotopic Geochemistry ◽  
Vein Type ◽  
External Contribution ◽  
Geological Information ◽  
Porphyry System ◽  
Porphyry Mo Deposit ◽  
Host Rocks ◽  
The Relationship

The Great Hinggan Range (GHR) hosts many large Mo deposits and vein-type Pb-Zn deposits and is one of the most important polymetallic metallogenic belts in China. Although Mo and Pb-Zn deposits are locally closely related in space in the GHR, it is disputed whether the Mo and Pb-Zn deposits have a genetic relationship. The Diyanqinamu Mo deposit located at the middle part of the northern GHR is a Late Jurassic large porphyry Mo deposit and closely adjacent by vein-type Pb-Zn deposit. In this work, we discussed the relationship between Mo and Pb-Zn deposits in Diyanqinamu mine based on the data of S and Pb isotopic geochemistry and geological information. In this mine, the Mo deposit is concentrated in the southern area with a distance of 500 m to the vein Pb-Zn deposit. The δ34SCDT values of the galena and sphalerite from the Mo deposit range from +1.73‰ to +7.29‰ with average of +5.04‰. By contrast, δ34SCDT values of the galena and sphalerite from the Pb-Zn deposit, ranging from +2.38‰ to +5.46‰ with average of +4.04‰, is similar to that of the Mo deposit. The formation temperatures of the Pb-Zn deposit calculated based on the sulfur isotope balance fractionation between sphalerite and co-existed galena range from 220 °C to 315 °C (average 247 °C), which is lower than that of the Mo mineralization (292–510°C). Pb isotopic results show that the 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb values of the Pb-Zn deposit range from 18.326–18.364, 15.541–15.589, and 38.054–38.214, respectively, which are slightly higher than those of the Mo deposit ranging from 18.287–18.331, 15.532–15.569, and 38.034–38.139, respectively. In the 206Pb/204Pb˗207Pb/204Pb diagram, sulfides sampled from the Mo and Pb-Zn deposits overlapped with each other and formed a linear distribution, indicating that they are derived from a mixed metal source with more external contribution to the Pb-Zn mineralization. This mixed signal is further confirmed by the geologic facts that the host rocks of the vein-type Pb-Zn deposit have abnormally high contents of Pb, Zn, and Ag, and experienced strong hydrothermal alteration. Combined with the ore geology, mineral assemblage, and isotopic geochemistry of the two types of mineralization, we propose that the Mo and Pb-Zn deposits in the Diyanqinamu mine represent different faces of the same porphyry system. This Mo-Pb-Zn metallogenic system would provide important clues on further prospecting of Mo and Pb-Zn resources in the GHR.

Delineation of the Normal Esophagus at Computed Tomography

1985 ◽  
Vol 26 (6) ◽  
pp. 665-669 ◽  
Author(s):  
L. Samuelsson ◽  
U. Tylén
Keyword(s):  
Main Bronchus ◽  
Anterior Wall ◽  
Middle Part ◽  
Left Main ◽  
Lower Esophagus ◽  
Normal Esophagus ◽  
Mediastinal Disease ◽  
Normal Men ◽  
The Relationship ◽  
Upper Third

It has been accepted by many that the esophagus in its entire length is easy to delineate at CT in most patients due to surrounding fat planes. As this is not the experience of the present authors, the CT of the thorax in 100 normal men and women without mediastinal disease and in good nutritional status was reviewed, to record the relationship between the esophagus and neighbouring structures. In the upper third of the esophagus there is almost never a definite border between its wall and that of the trachea, while a separating border or even a fat plane can be seen to the spine in between 25 and 50 per cent of those tested. The vessels, as a rule, have a fat plane towards the esophagus. The middle part of the esophagus has the same intimate relationship to the trachea and left main bronchus, i.e. almost never any separating border. Two thirds of the cases have no border to the upper part of the pericardium (left atrium), while about 70 per cent have a border or fat plane towards the aorta. The middle and lower third of the esophagus has, as a rule, a distinct border or fat plane to the spine. In about 50 per cent of the patients the anterior wall of the lower esophagus is separable from the pericardium.

Prospecting Direction and Geological Characteristics of the Jiwa Area, Nima County, Tibet

2012 ◽  
Vol 616-618 ◽  
pp. 73-79
Author(s):  
Jian Guo Wang
Keyword(s):  
Gold Deposits ◽  
Comprehensive Analysis ◽  
Geological Characteristics ◽  
Evolution Characteristics ◽  
Low Degree ◽  
Distribution Of Elements ◽  
Vein Type ◽  
Relationship Of ◽  
The Relationship ◽  
Rock Strata

It is a low degree of geological studiedness in Jiwa area, the published synthesis and other reliable data is rare. By adopting similar analogy and comprehensive analysis methods, it found that the content is the highest about Au, As, Sb, Cu and W based on the relationship of the distribution of elements and time, this characteristic has reflected the evolution characteristics of carbonate in Palaeozoic in this area. The content is the highest about Pb, Zn, Ag and Cd in volcanic rock strata in Paleogene-Neogene, it reflected that the characteristic of elements associations related to intermediate-acidic volcanic activity. The content is the highest about Au, Ag and Sn in strata in Quaternary, which would forms gold deposits (spots), it reflected mainly the characteristic of elements mineral enrichment related with weathering origin in period. There are three minerals-ore combination types of wolframite-molybdenum-bismuthinite-chalcopyrite-pyrite quartz vein type, wolframite-molybdenum-bismuthinite-chalcopyrite-pyrite mica-quartz type, tungsten-molybden- limonite ores-oxidised type. Prospecting direction is Au-Pb-Zn hydrothermal filling type, the Cu deposit of sand-type and skarn-type copper polymetallic deposit. It has very important theory and real sense via scientific investigation of main geologic characteristics and metallogenic models research in Jiwa area.

scholarly journals Topologically associated domains enriched for lineage-specific genes reveal expression-dependent nuclear topologies during myogenesis

2016 ◽  
Vol 113 (12) ◽  
pp. E1691-E1700 ◽  
Author(s):  
Daniel S. Neems ◽  
Arturo G. Garza-Gongora ◽  
Erica D. Smith ◽  
Steven T. Kosak
Keyword(s):  
Gene Regulation ◽  
Genome Organization ◽  
Spatial Organization ◽  
Potential Role ◽  
Spatial Distance ◽  
Linear Distribution ◽  
Myotube Formation ◽  
Topologically Associated Domains ◽  
The Relationship ◽  
Lineage Specific Genes

The linear distribution of genes across chromosomes and the spatial localization of genes within the nucleus are related to their transcriptional regulation. The mechanistic consequences of linear gene order, and how it may relate to the functional output of genome organization, remain to be fully resolved, however. Here we tested the relationship between linear and 3D organization of gene regulation during myogenesis. Our analysis has identified a subset of topologically associated domains (TADs) that are significantly enriched for muscle-specific genes. These lineage-enriched TADs demonstrate an expression-dependent pattern of nuclear organization that influences the positioning of adjacent nonenriched TADs. Therefore, lineage-enriched TADs inform cell-specific genome organization during myogenesis. The reduction of allelic spatial distance of one of these domains, which contains Myogenin, correlates with reduced transcriptional variability, identifying a potential role for lineage-specific nuclear topology. Using a fusion-based strategy to decouple mitosis and myotube formation, we demonstrate that the cell-specific topology of syncytial nuclei is dependent on cell division. We propose that the effects of linear and spatial organization of gene loci on gene regulation are linked through TAD architecture, and that mitosis is critical for establishing nuclear topologies during cellular differentiation.

scholarly journals CENTROSOMES AND MICROTUBULES DURING MEIOSIS IN THE MUSHROOM BOLETUS RUBINELLUS

1971 ◽  
Vol 50 (3) ◽  
pp. 737-745 ◽  
Author(s):  
David J. McLaughlin
Keyword(s):  
Electron Microscope ◽  
Longitudinal Axis ◽  
Spindle Pole ◽  
Middle Part ◽  
Prophase I ◽  
Cytoplasmic Microtubules ◽  
Oriented Parallel ◽  
Relationship Of ◽  
The Relationship

The double centrosome in the basidium of Boletus rubinellus has been observed in three planes with the electron microscope at interphase preceding nuclear fusion, at prophase I, and at interphase I. It is composed of two components connected by a band-shaped middle part. At anaphase I a single, enlarged centrosome is found at the spindle pole, which is attached to the cell membrane. Microtubules mainly oriented parallel to the longitudinal axis of the basidium are present at prefusion, prophase I and interphase I. Cytoplasmic microtubules are absent when the spindle is present. The relationship of the centrosome in B. rubinellus to that in other organisms and the role of the cytoplasmic microtubules are discussed.

scholarly journals Formation features and a geodynamic map of the Ural-Timan-Paleo-Asian segment of Eurasia

LITOSFERA ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 607-629
Author(s):  
V. A. Koroteev ◽  
V. M. Necheukhin ◽  
V. A. Dushin ◽  
E. N. Volchek
Keyword(s):  
Time Intervals ◽  
Subsequent Transformation ◽  
The North ◽  
Upper Proterozoic ◽  
Geological Information ◽  
Formation Conditions ◽  
Orogenic Belts ◽  
Relationship Of ◽  
The Relationship ◽  
North Western

Research subject. This article is devoted to the formation features of the Ural-Timan-Paleo-Asian segment of Eurasia. Materials and methods. The research was based on the authors’ data and those obtained following a review of available publications on the geology of segmentation. The Timan region was investigated using the geological information obtained by V.G. Olovyanishnikov.Results. A geodynamic map of the Ural-Timan-Paleo-Asian segment with a scale of 1 : 2 500 000 was compiled, which allowed further research into the structure and formation of the north-western part of the Eurasian area. This part was found to be mostly composed of geodynamic associations of orogens, orogenic systems and orogenic belts of the Upper Proterozoic (Riphean) and Paleozoic time intervals, as well as by elements of the Mesozoic-Cenozoic neoplate. These processes were supplemented by the formation of tectonic systems of superimposed depressions and protoplate protrusions. The formation of orogens, orogenic systems and orogenic belts is associated with the development and subsequent transformation of paleooceanic basins under the conditions of accretion and collision. The terranes of the ancient continental crust also participated in the formation of the segment’s geodynamic elements, for which a typification scheme was proposed. The articles present new data on the formation conditions of the segment’s orogenic elements and the relationship of the orogeny with global reconstructions, including the problem of closing the surrounding oceanic space.

scholarly journals Freight Transportation and Economic Growth for Zones: Sustainability and Development Strategy in China

2020 ◽  
Vol 12 (24) ◽  
pp. 10450
Author(s):  
Yanli Ma ◽  
Jieyu Zhu ◽  
Gaofeng Gu ◽  
Ke Chen
Keyword(s):  
Economic Growth ◽  
Economic Development ◽  
Granger Causality ◽  
Development Strategy ◽  
Freight Transportation ◽  
Middle Part ◽  
Response Analysis ◽  
Causality Test ◽  
Economic Zone ◽  
The Relationship

The causal relationship between zonal freight turnover and gross domestic product (GDP) are receiving increasing attention to coordinate the balanced development of freight transportation and zonal economic level effectively. However, studies on the causality direction between freight transportation and economic have so far been in debate. To understand the relationship of causality direction between transportation and economic development for different zones which can provide decision support for public policies, econometrics is used to analyze the relationship between them. This paper investigates the relationship between GDP and freight turnover for economic zones of stationary series and non-stationary sequences using the vector autoregressive (VAR) and the vector error correction models (VECM). The impulse response analysis and variance decomposition are conducted to verify the effectiveness of the models. The Granger causality test is exploited to discover the relationship between transportation and economic development in each economic zone. The data on freight transportation and GDP in China from 2003 to 2018 is used. Results show that the relationship between freight turnover and GDP in the Northeast economic zone is bidirectional. A unidirectional relationship exists between freight turnover and GDP in the Circum Bohai-Sea, the Pearl River, Middle Part, Southwest, and Northwest zone. And the Granger causality is not obvious in the Yangtze River economic zone. In addition, suggestions for the zonal development of transportation and economic systems are provided. This study can provide a basis to adopt relevant policies and measures of sustainable development between transportation and economic growth for different zones.

scholarly journals Emotional Intelligence and Psychobiosocial States: Mediating Effects of Intra-Team Communication and Role Ambiguity

2020 ◽  
Vol 12 (21) ◽  
pp. 9019
Author(s):  
Rachele Nateri ◽  
Claudio Robazza ◽  
Asko Tolvanen ◽  
Laura Bortoli ◽  
Antonis Hatzigeorgiadis ◽  
...  
Keyword(s):  
Emotional Intelligence ◽  
Structural Equation ◽  
Role Ambiguity ◽  
Important Variable ◽  
Middle Part ◽  
Equation Modeling ◽  
Trait Emotional Intelligence ◽  
Team Communication ◽  
Mediating Effects ◽  
The Relationship

Emotional intelligence is an important variable related to the interaction and functioning of sports teams. The present study examined the relationship between players’ trait emotional intelligence and functional and dysfunctional psychobiosocial states. In particular, we examined the mediating effects of intra-team communication efficacy and role ambiguity in this relationship. The participants were 291 (174 men and 117 women) Italian players involved in various team sports (i.e., futsal, soccer, volleyball, handball, and rugby). They completed a multi-section questionnaire assessing the study variables during the early/middle part of their competitive seasons. Structural equation modeling (SEM) showed trait emotional intelligence to positively predict functional psychobiosocial states and negatively predict dysfunctional psychobiosocial states. Effective intra-team communication mediated the relationship between emotional intelligence and functional states, while role ambiguity was a mediator of the relationship between trait emotional intelligence and dysfunctional states. Overall, the results highlight the importance of examining trait emotional intelligence as an antecedent of players’ psychobiosocial states in applied sport contexts both in terms of team functioning and individual optimal sport experience.

scholarly journals The Gersdorffite-Bismuthinite-Native Gold Association and the Skarn-Porphyry Mineralization in the Kamariza Mining District, Lavrion, Greece

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 531 ◽  
Author(s):  
Panagiotis Voudouris ◽  
Constantinos Mavrogonatos ◽  
Branko Rieck ◽  
Uwe Kolitsch ◽  
Paul Spry ◽  
...  
Keyword(s):  
Base Metal ◽  
Hydrothermal Fluid ◽  
Native Gold ◽  
Magmatic Fluid ◽  
Mining District ◽  
Sulfur Fugacity ◽  
Vein Type ◽  
Late Evolution ◽  
Initial Deposition ◽  
Host Rocks

Vein-type Pb-Ni-Bi-Au-Ag mineralization at the Clemence deposit in the Kamariza and “km3” in the Lavrion area, was synchronous with the intrusion of a Miocene granodiorite body and related felsic and mafic dikes and sills within marbles and schists in the footwall of (and within) the Western Cycladic detachment system. In the Serpieri deposit (Kamariza area), a porphyry-style pyrrhotite-arsenopyrite mineralized microgranitic dike is genetically related to a garnet-wollastonite bearing skarn characterized by a similar base metal and Ni (up to 219 ppm) enrichment. The Ni–Bi–Au association in the Clemence deposit consists of initial deposition of pyrite and arsenopyrite followed by an intergrowth of native gold-bismuthinite and oscillatory zoned gersdorffite. The zoning is related to variable As, Ni, and Fe contents, indicating fluctuations of arsenic and sulfur fugacity in the hydrothermal fluid. A late evolution towards higher sulfur fugacity in the mineralization is evident by the deposition of chalcopyrite, tennantite, enargite, and galena rimming gersdorffite. At the “km3” locality, Ni sulfides and sulfarsenides, vaesite, millerite, ullmannite, and polydymite, are enclosed in gersdorffite and/or galena. The gersdorffite is homogenous and contains less Fe (up to 2 wt.%) than that from the Clemence deposit (up to 9 wt.%). Bulk ore analyses of the Clemence ore reveal Au and Ag grades both exceeding 100 g/t, Pb and Zn > 1 wt.%, Ni up to 9700 ppm, Co up to 118 ppm, Sn > 100 ppm, and Bi > 2000 ppm. The “km3” mineralization is enriched in Mo (up to 36 ppm), Ni (>1 wt.%), and Co (up to 1290 ppm). Our data further support a magmatic contribution to the ore-forming fluids, although remobilization and leaching of metals from previous mineralization and/or host rocks, through the late involvement of non-magmatic fluid in the ore system, cannot be excluded.

scholarly journals Mineralogical Constraints on the Potassic and Sodic-Calcic Hydrothermal Alteration and Vein-Type Mineralization of the Maronia Porphyry Cu-Mo ± Re ± Au Deposit in NE Greece

Minerals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 182 ◽  
Author(s):  
Vasilios Melfos ◽  
Panagiotis Voudouris ◽  
Margarita Melfou ◽  
Matías G. Sánchez ◽  
Lambrini Papadopoulou ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Fluid Phase ◽  
Aqueous Fluid ◽  
Gas Content ◽  
Magmatic Fluid ◽  
Brittle Deformation ◽  
Fluid Circulation ◽  
Magmatic Rocks ◽  
Vein Type ◽  
Host Rocks

The Maronia Cu-Mo ± Re ± Au deposit is spatially related to a microgranite porphyry that intruded an Oligocene monzonite along the Mesozoic Circum-Rhodope belt in Thrace, NE Greece. The magmatic rocks and associated metallic mineralization show plastic and cataclastic features at the south-eastern margin of the deposit that implies emplacement at the ductile-brittle transition, adjacent to a shear zone at the footwall of the Maronia detachment fault. The conversion from ductile to brittle deformation caused a rapid upward magmatic fluid flow and increased the volume of water that interacted with the host rocks through high permeable zones, which produced extensive zones of potassic and sodic-calcic alteration. Potassic alteration is characterized by secondary biotite + K-feldspar (orthoclase) + magnetite + rutile + quartz ± apatite and commonly contains sulfides (pyrite, chalcopyrite, pyrrhotite). Sodic-calcic alteration consists of actinolite + sodic-calcic plagioclase (albite/oligoclase/andesine) + titanite + magnetite + chlorite + quartz ± calcite ± epidote-allanite. The high-oxidation state of the magmas and the hydrothermal fluid circulation were responsible for the metal and sulfur enrichments of the aqueous fluid phase, an increase in O2 gas content, the breakdown of the magmatic silicates and the production of the extensive potassic and sodic-calcic alterations. Brittle deformation also promoted the rapid upward fluid flow and caused interactions with the surrounding host rocks along the high temperature M-, EB-, A- and B-type veins.

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