Geochemical Characteristics and Genesis of Volcanic Rocks from Zhangjiakou Formation in the Chaoyang Basin, Western Liaoning

2012 ◽  
Vol 524-527 ◽  
pp. 126-129
Author(s):  
Yan Dong Peng ◽  
De He Xing
Keyword(s):  
Volcanic Rocks ◽  
Western Liaoning ◽  
Average Value ◽  
High K ◽  
Transitional Environment ◽  
Extensional Structure ◽  
Basic Characteristics ◽  
The Right ◽  
Compatible Elements ◽  
Volcanic Cycle

The Zhangjiakou Formation of Late Jurassic is mainly distributed in the Chaoyang basin in Western Liaoning. Zhangjiakou volcanic cycle may be divided into three subcycles. The volcanic rocks of Zhangjiakou Formation mainly consist of rhyolites, trachyte and trachyandesites. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low MgO and TiO2 components. σ=1.76-4.34, the average value is 2.59. Chemical composition of volcanic rocks indicates that they belong to the high-K calc-alkaline magmatic serious. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li), and depleted in compatible elements (Ti, Co, Ni, Cr, V).The volcanic rocks is rich in LREE. The spider patterns are the right-incline. There is a slight low Eu negative abnormality and low Ce negative abnormality. The geochemistry characteristic shows that volcanic rocks of Zhangjiakou volcanic cycle were formed in the transitional environment of compressional orogeny and extensional structure. They have the basic characteristics of continental intra-plate volcanic rocks. The volcanic rocks were mainly derived from the crust materials. The lithogenesis take partial melting as a major part.

Geochemical Characteristics and Genesis for Volcanic Rocks of Yixian Formation in Western Liaoning Province

2014 ◽  
Vol 962-965 ◽  
pp. 282-285
Author(s):  
Yan Dong Peng ◽  
Chun Yun Yu ◽  
Xiong Fei Bian
Keyword(s):  
Volcanic Rocks ◽  
Yixian Formation ◽  
Liaoning Province ◽  
Calc Alkaline ◽  
Western Liaoning ◽  
Incompatible Elements ◽  
High K ◽  
The Right ◽  
Compatible Elements ◽  
Comprehensive Study

Volcanic rocks of Yixian Formation were widely distributed in western Liaoning. The Yixian volcanic cycle of early Cretaceous in the Chaoyang basin can be divided into two subcycles. The first subcycle is composed of basalt, basalt andesite and andesite. The second subcycle is composed of trachyandensite and trachyte. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low TiO2 components. The volcanic rocks are obviously enriched in incompatible elements, and depleted in compatible elements. The ∑REE of volcanic rocks is high and rich in LREE. The spider patterns are the right-incline, there is a slight low Eu negative abnormality and low Ce negative abnormality. The characteristics show that volcanic rocks of Yixian Formation belong to the high-K calc-alkaline magmatic serious. Comprehensive study shows that the volcanic rocks of Yixian Formation were generated in response to lithosphere extension in the continent intraplate orogenic belt.

Essential Characteristics of Volcanic Rocks of Yixian Formation and Discussion on Tectonic Setting in Chaoyang Basin, Western Liaoning

2012 ◽  
Vol 170-173 ◽  
pp. 1261-1264
Author(s):  
Yan Dong Peng ◽  
De He Xing
Keyword(s):  
Tectonic Setting ◽  
Volcanic Rocks ◽  
Yixian Formation ◽  
Western Liaoning ◽  
Incompatible Elements ◽  
High K ◽  
Petrology And Geochemistry ◽  
Bottom To Top ◽  
Compatible Elements ◽  
Comprehensive Study

Volcanic rocks of Early Cretaceous Yixian Formation were widely distributed in western Liaoning. The Yixian Formation in the Chaoyang basin can be divided into two subcycles from bottom to top. The first subcycle is composed of basalt, basalt andesite and andesite. The second subcycle is composed of trachyandensite and trachyte. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low TiO2 components. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li etc.), and depleted in compatible elements (Co, Ni, Cr, V etc.). The volcanic rocks are rich in LREE. There is a slight low Eu negative abnormality and low Ce negative abnormality. Based on t he studies of petrology and geochemistry, volcanic rocks of Yixian Formation belong to the high-K calc-alkaline magmatic serious. Comprehensive study of regional structures and geochemistry of volcanic rocks, the volcanic rocks of Yixian Formation were generated in the environment of lithosphere inhomogeneous extension, as a product of the intraplate orogeny of Yanshan Mountains.

Early Cretaceous crust–mantle interaction linked to rollback of the Palaeo-Pacific flat-subducting slab: constraints from the intermediate–felsic volcanic rocks of the northern Great Xing’an Range, NE China

2021 ◽  
pp. 1-22
Author(s):  
Jia-Hao Jing ◽  
Hao Yang ◽  
Wen-Chun Ge ◽  
Yu Dong ◽  
Zheng Ji ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Volcanic Rocks ◽  
Geochemical Data ◽  
Calc Alkaline ◽  
Ne China ◽  
Asthenospheric Mantle ◽  
High K ◽  
Wide Range ◽  
Great Xing’An Range ◽  
Subducting Slab

Abstract Late Mesozoic igneous rocks are important for deciphering the Mesozoic tectonic setting of NE China. In this paper, we present whole-rock geochemical data, zircon U–Pb ages and Lu–Hf isotope data for Early Cretaceous volcanic rocks from the Tulihe area of the northern Great Xing’an Range (GXR), with the aim of evaluating the petrogenesis and genetic relationships of these rocks, inferring crust–mantle interactions and better constraining extension-related geodynamic processes in the GXR. Zircon U–Pb ages indicate that the rhyolites and trachytic volcanic rocks formed during late Early Cretaceous time (c. 130–126 Ma). Geochemically, the highly fractionated I-type rhyolites exhibit high-K calc-alkaline, metaluminous to weakly peraluminous characteristics. They are enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs) but depleted in high-field-strength elements (HFSEs), with their magmatic zircons ϵHf(t) values ranging from +4.1 to +9.0. These features suggest that the rhyolites were derived from the partial melting of a dominantly juvenile, K-rich basaltic lower crust. The trachytic volcanic rocks are high-K calc-alkaline series and exhibit metaluminous characteristics. They have a wide range of zircon ϵHf(t) values (−17.8 to +12.9), indicating that these trachytic volcanic rocks originated from a dominantly lithospheric-mantle source with the involvement of asthenospheric mantle materials, and subsequently underwent extensive assimilation and fractional crystallization processes. Combining our results and the spatiotemporal migration of the late Early Cretaceous magmatic events, we propose that intense Early Cretaceous crust–mantle interaction took place within the northern GXR, and possibly the whole of NE China, and that it was related to the upwelling of asthenospheric mantle induced by rollback of the Palaeo-Pacific flat-subducting slab.

Penggunaan Permainan Edukasi pada Pembelajaran Daring Mata Pelajaran Geografi Kelas XII di MA PPPI Miftahussalam Banyumas

2021 ◽  
Vol 1 ◽  
pp. 20-22
Author(s):  
Faris Salman Faza
Keyword(s):  
Online Learning ◽  
Teaching And Learning ◽  
Educational Games ◽  
Learning Activities ◽  
Qualitative Description ◽  
Learning Goals ◽  
Face To Face ◽  
Average Value ◽  
Geography Teaching ◽  
The Right

The existence of the COVID-19 outbreak has an impact on all sectors of life, one of which is in the education sector, many schools are forced to dismiss their students and teaching and learning activities are carried out online. the transition of Geography teaching and learning activities at MA PPPI Miftahussalam Banyumas from face to face to online creates new problems in learning so that a special strategy is needed in this learning. Although online learning is not effective for achieving learning goals, the teacher must be able to make new innovations so that learning objectives can be achieved. This study uses a qualitative description method by observing the behavior of students when online learning takes place. Learning online Geography class XII at MA PPPI Miftahussalam Banyumas uses educational games. This study aims to find out the right media in learning Geography class XII during the COVID-19 pandemic at MA PPPI Miftahussalam Banyumas. The results of this study showed that 76 students of class XII MA PPPI Miftahussalam Banyumas who had taken the test showed an average value> 8.00. This shows satisfactory results.

scholarly journals Difference in height of maxillary alveolar ridge on edentulous women and dentate women using panoramic radiography

2019 ◽  
Vol 10 (2) ◽  
pp. 1243-1248
Author(s):  
Cek Dara Manja ◽  
Dennis
Keyword(s):  
Panoramic Radiography ◽  
Total Sample ◽  
Mechanical Stimulus ◽  
Average Height ◽  
Alveolar Ridge ◽  
Cross Sectional ◽  
Average Value ◽  
Significant Difference ◽  
The Difference ◽  
The Right

The height of the maxillary alveolar ridge can be measured using panoramic radiography. The decline occurred because the height of the alveolar ridge undergoes slow physiological resorption due to the absence of mechanical stimulus. The purpose of this research is to know the difference and the average height of the maxillary alveolar ridge in edentulous and dentate women using panoramic radiography. This study is an analytical method with a cross-sectional approach. A total sample of 40 women, edentulous and dentate has been measured. Measurements were made by measuring the distance between the lowest point of the infraorbital ridge and alveolar crest maxilla on the incisor point, right and left premolar, right and left molar. A statistical test is done using independent t-test. The results showed that the average value of a dentate women sample is greater than edentulous. The average value obtained by the dentate sample is greatest in incisor point by 37,57mm± 3,34mm and the smallest at the right molar point by 33,87mm ± 2,81mm. The average value obtained by the edentulous sample is greatest in incisor point by 35,30mm ± 2,79mm and the smallest at the right molar point by 31,84mm ± 3,85mm. It can be concluded that there is a significant difference in the height of the maxillary alveolar ridge on an edentulous sample and dentate, except the right molar teeth. The average height of the maxillary alveolar ridge in an edentulous sample is 33,35mm ± 3,43mm, and the dentate sample is 35,66mm ± 3,21mm.

scholarly journals Pravni položaj poštenog i nepoštenog posjednika u odnosu na vlasnika stvari

2017 ◽  
Vol 38 (1) ◽  
pp. 527-543
Author(s):  
Jadranko Jug
Keyword(s):  
Supreme Court ◽  
Case Law ◽  
Basic Method ◽  
Unjust Enrichment ◽  
The Supreme Court ◽  
Legal Position ◽  
The Republic ◽  
Basic Characteristics ◽  
The Right

This paper deals with the problems related to the legal position of honest and dishonest possessors in relation to the owner of things, that is, it analyses the rights belonging to the possessors of things and the demands that possessors may require from the owners of things to whom the possessors must submit those things. Also, in contrast, the rights and requirements are analysed of the owners of things in relation to honest and dishonest possessors. In practice, a dilemma arises in defi ning the essential and benefi cial expenditure incurred by honest possessors, what the presumptions are for and until when the right of retention may be exercised for the sake of remuneration of that expenditure, when the statute of limitations expires on that claim, and the signifi cance of the provisions of the Civil Obligations Act in relation to unjust enrichment, management without mandate and the right of retention, and which provisions regulate these or similar issues. The answers to some of these dilemmas have been provided in case law, and therefore the basic method used in the paper was analysis and research of case law, especially decisions by the Supreme Court of the Republic of Croatia. The introduction to the paper provides the basic characteristics of the concept of possession and possession of things, and the type and quality of possession, to provide a basis for the subsequent analysis of the legal position of the possessor of a thing in relation to the owner of that thing.

scholarly journals Nonlinear analysis of fluctuations of microcirculation parameters in symmetrical organs of humans by laser doppler flowmetry

2019 ◽  
Vol 17 (4) ◽  
pp. 33-38 ◽  
Author(s):  
L. V. Mezentseva
Keyword(s):  
Nonlinear Dynamics ◽  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Coefficient Of Variation ◽  
Correlation Dimension ◽  
The Body ◽  
Doppler Flowmetry ◽  
Average Value ◽  
Flow Fluctuations ◽  
The Right

Purpose– the study the nonlinear dynamics of microcirculation parameters in human symmetrical organs.Material and Methods. Parameters of microcirculation were measured in healthy volunteers (aged between 50 and 70 years) by means of laser Doppler flowmetry (LDF). LDF signal transducers were fixed symmetrically on the lower parts of the right and left shoulders (3 cm above the elbow bend). The degree of chaoticity of microcirculation parameters as a nonlinear dynamic process was estimated using Hausdorff’s index, relative entropy and characteristics of phase portraits. Along with components of the amplitude-and-frequency range for blood flow fluctuations (myogenic, neurogenic, respiratory, and cardiac) was estimated and correlations between all characteristics of microcirculation in both sides of the body were done.Results.Asymmetry of correlation relationships of nonlinear dynamics parameters and components of the amplitude-andfrequency range for blood flow fluctuations of right and left sides of the body was revealed. Hausdorff index in the left side correlated not only with the average value of perfusion and with the coefficient of variation in the same side (r1 = –0,68; r2 =–0,51), but also with correlation dimension of chaos in the opposite side (r=0,49). Similarly, entropy in the left side correlated not only with the average value of perfusion and coefficient of variation in the left (r1 =0,43; r2 =0,60), but also with the entropy and correlation dimension of chaos in the right side (r1 =0,48; r2 =–0,41). The neurogenic component in the left side positively correlated with the myogenic component in the same side (r=0,71). A positive correlation was observed between the neurogenic component in right side and myogenic component in the opposite side (r=0,57). Asymmetry of correlation relationships was also revealed for the respiratory and cardiac components.Conclusions. Our results illustrate the specific regulation of blood flow in micro vessels of paired organs, which is associated with functional asymmetry. The physiological mechanisms for this asymmetry require further experimental and clinical studies. 

Chapter 3.1b Antarctic Peninsula and South Shetland Islands: petrology

2021 ◽  
pp. M55-2018-68 ◽  
Author(s):  
Philip T. Leat ◽  
Teal R. Riley
Keyword(s):  
Antarctic Peninsula ◽  
Continental Margin ◽  
Volcanic Rocks ◽  
Oceanic Lithosphere ◽  
Contact Metamorphism ◽  
South Shetland Islands ◽  
Calc Alkaline ◽  
The Pacific ◽  
High K ◽  
The Antarctic

AbstractThe Antarctic Peninsula contains a record of continental-margin volcanism extending from Jurassic to Recent times. Subduction of the Pacific oceanic lithosphere beneath the continental margin developed after Late Jurassic volcanism in Alexander Island that was related to extension of the continental margin. Mesozoic ocean-floor basalts emplaced within the Alexander Island accretionary complex have compositions derived from Pacific mantle. The Antarctic Peninsula volcanic arc was active from about Early Cretaceous times until the Early Miocene. It was affected by hydrothermal alteration, and by regional and contact metamorphism generally of zeolite to prehnite–pumpellyite facies. Distinct geochemical groups recognized within the volcanic rocks suggest varied magma generation processes related to changes in subduction dynamics. The four groups are: calc-alkaline, high-Mg andesitic, adakitic and high-Zr, the last two being described in this arc for the first time. The dominant calc-alkaline group ranges from primitive mafic magmas to rhyolite, and from low- to high-K in composition, and was generated from a mantle wedge with variable depletion. The high-Mg and adakitic rocks indicate periods of melting of the subducting slab and variable equilibration of the melts with mantle. The high-Zr group is interpreted as peralkaline and may have been related to extension of the arc.

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