Petrology, petrography, and crystallization history of intrusive phases related to the Hall (Nevada Moly) molybdenum deposit, Nye County, Nevada

1988 ◽  
Vol 25 (7) ◽  
pp. 1000-1019 ◽  
Author(s):  
Stephen A. Shaver
Keyword(s):  
Rapid Development ◽  
Solidus Temperature ◽  
Conductive Heat ◽  
Compositional Zoning ◽  
Magma Column ◽  
Fine Grained ◽  
Molybdenum Deposit ◽  
History Of ◽  
Compositional Gradients ◽  
Fluid Release

Each of the two quartz monzonite porphyry intrusions that form the Hall stock contains four phases concentrically zoned from fine-grained, groundmass-rich, silicic (70–73 wt. % SiO2) phases at the top and margin toward deeper phases that are progressively coarser, more equigranular, and richer in plagioclase and biotite (68–72 wt. % SiO2). In each stock, the depthwise decrease in groundmass is not continuous but is interrupted by flow-foliated, gradational contacts (at 60–70, 50, and 10 vol. % groundmass) at or above which concentrations of quartz–molybdenite veins and (or) other SiO2-rich features are common. Magma supercooling is documented by quartz–K-feldspar dendrites and crenulate quartz layers at phase contacts. Rare sharp contacts and xenoliths document that all phases are temporally distinct, with earliest phases at the top and margin and progressively later phases inward and with depth. However, gradational contacts, concentricity of phases, and unidirectionality of textural–compositional zoning argue that each stock developed from a single magma column whose progressively inward crystallization was episodically interrupted by the release of molybdenum-bearing fluids to produce stacked orebodies. Conductive heat-loss modeling indicates that each stock took ≤ 1130 years to (i) cool to solidus temperature (740–750 °C) and (ii) form three distinct molybdenum shells. Not only is progressively deeper fluid release from concentrically zoned textural phases of a single magma column previously undocumented, but also the short cooling interval in each stock implies very rapid rates of volatile migration in these systems and thus very rapid development of vertical compositional gradients.

Crystallisation of fine- and coarse-grained A-type granite sheets of the Southern Oklahoma Aulacogen, U.S.A.

2000 ◽  
Vol 91 (1-2) ◽  
pp. 139-150 ◽  
Author(s):  
John P. Hogan ◽  
M. Charles Gilbert ◽  
Jon D. Price
Keyword(s):  
Solidus Temperature ◽  
Direct Consequence ◽  
Progressive Increase ◽  
Coarse Grained ◽  
Fine Grained ◽  
Mafic Complex ◽  
Southern Oklahoma ◽  
History Of ◽  
Volcanic Pile ◽  
Crustal Magma

A-type felsic magmatism associated with the Cambrian Southern Oklahoma Aulacogen began with eruption of voluminous rhyolite to form a thick volcanic carapace on top of an eroded layered mafic complex. This angular unconformity became a crustal magma trap and was the locus for emplacement of later subvolcanic plutons. Rising felsic magma batches ponding along this crustal magma trap crystallised first as fine-grained granite sheets and then subsequently as coarser-grained granite sheets. Aplite dykes, pegmatite dykes and porphyries are common within the younger coarser-grained granite sheets but rare to absent within the older fine-grained granite sheets. The older fine-grained granite sheets typically contain abundant granophyre.The differences between fine-grained and coarse-grained granite sheets can largely be attributed to a progressive increase in the depth of the crustal magma trap as the aulacogen evolved. At low pressures (<200MPa) a small increase in the depth of emplacement results in a dramatic increase in the solubility of H2O in felsic magmas. This is a direct consequence of the shape of the H2O-saturated granite solidus. The effect of this slight increase in total pressure on the crystallisation of felsic magmas is to delay vapour saturation, increase the H2O content of the residual melt fractions and further depress the solidus temperature. Higher melt H2O contents, and an extended temperature range over which crystallisation can proceed, both favour crystallisation of coarser-grained granites. In addition, the potential for the development of late, H2O-rich, melt fractions is significantly enhanced. Upon reaching vapour saturation, these late melt fractions are likely to form porphyries, aplite dykes and pegmatite dykes.For the Southern Oklahoma Aulacogen, the progressive increase in the depth of the crustal magma trap at the base of the volcanic pile appears to reflect thickening of the volcanic pile during rifting, but may also reflect emplacement of earlier granite sheets. Thus, the change in textural characteristics of granite sheets of the Wichita Granite Group may hold considerable promise as an avenue for further investigation in interpreting the history of this rifting event.

History—an overview

2018 ◽  
Author(s):  
Oriol Bohigas ◽  
Hans A. Weidenmüller
Keyword(s):  
Random Matrix Theory ◽  
Random Matrix ◽  
Matrix Theory ◽  
Rapid Development ◽  
The Past ◽  
History Of ◽  
And Mathematics

An overview of the history of random matrix theory (RMT) is provided in this chapter. Starting from its inception, the authors sketch the history of RMT until about 1990, focusing their attention on the first four decades of RMT. Later developments are partially covered. In the past 20 years RMT has experienced rapid development and has expanded into a number of areas of physics and mathematics.

Professional Psychology in Portugal

1997 ◽  
Vol 81 (3_suppl) ◽  
pp. 1211-1222 ◽  
Author(s):  
Teresa Fagulha ◽  
Richard H. Dana
Keyword(s):  
Rapid Development ◽  
Well Being ◽  
Professional Psychology ◽  
Current Status ◽  
Environmental Concerns ◽  
Advanced Degrees ◽  
Professional Degree ◽  
History Of ◽  
Training Research

This paper describes the history and current status of professional psychology in Portugal where a unique perspective combines training, research, and practical contributions from Europe and the Americas with their own history of psychological tradition and expertise. Training in professional psychology includes Social Psychology and Educational and Vocational Guidance specializations in addition to Clinical Psychology and Psychotherapy and Counseling for the professional degree, Licenciatura. Advanced degrees are offered in Environmental Psychology, Career Development, Social Cognition, and other areas, primarily for academic positions. Research in all of these areas is expected to have applied outcomes that contribute to individual well being and an improved quality of life for the entire population. The result has been a rapid development of an indigenous professional psychology to address mental health, social, and environmental concerns that compel psychological attention and resources worldwide as well as those problems of local and national origins.

History of Neuropsychology in Asia

2016 ◽  
Author(s):  
Tatia M.C. Lee ◽  
Wang Kai ◽  
Simon L. Collinson
Keyword(s):  
Information Exchange ◽  
Rapid Development ◽  
Sources Of Information ◽  
Clinical Neuropsychology ◽  
The West ◽  
Multiple Processes ◽  
History Of ◽  
The Rich ◽  
External Forces ◽  
Brain Behavior

Clinical neuropsychology in Asia has emerged from the interactions of multiple processes, including the development of psychology and its subdisciplines worldwide, the entering of psychology into Asia and ongoing intellectual influences from outside of Asia, indigenous responses to those external forces, and homegrown initiatives in studying brain-behavior relationships prior to and since the beginnings of modern neuropsychology. This chapter reviews the history of neuropsychology in China, Hong Kong, Singapore, and other Asian regions. With globalization and increasing ease of information exchange, neuropsychological practice in Asia will continue to be shaped by influence from the West interacting with the indigenization process to shape the development of neuropsychology in Asia. Rapid development of neuroscience leads to cutting-edge findings and discovery of brain-behavior relationships, which has and will continue to be one of the rich sources of information that guides and shapes neuropsychological practice in Asia and worldwide.

Use of pyrite microfabric as a key to tectono-thermal evolution of massive sulphide deposits – an example from Deri, southern Rajasthan, India

1998 ◽  
Vol 62 (2) ◽  
pp. 197-212 ◽  
Author(s):  
Anju Tiwary ◽  
Mihir Deb ◽  
Nigel J. Cook
Keyword(s):  
Thermal Evolution ◽  
Regional Metamorphism ◽  
Massive Sulphide ◽  
Ductile Deformation ◽  
Sulphide Deposit ◽  
Fine Grained ◽  
Thermal Metamorphism ◽  
Sulphide Ores ◽  
History Of ◽  
South Delhi Fold Belt

AbstractPyrite is an ubiquitous constituent of the Proterozoic massive sulphide deposit at Deri, in the South Delhi Fold Belt of southern Rajasthan. Preserved pyrite microfabrics in the Zn-Pb-Cu sulphide ores of Deri reveal a polyphase growth history of the iron sulphide and enable the tectono-thermal evolution of the deposit to be reconstructed.Primary sedimentary features in Deri pyrites are preserved as compositional banding. Regional metamorphism from mid-greenschist to low amphibolite facies is recorded by various microtextures of pyrite. Trails of fine grained pyrite inclusions within hornblende porphyroblasts define S1-schistosity. Pyrite boudins aligned parallel to S1 mark the brittle–ductile transformation of pyrite during the earliest deformation in the region. Isoclinal to tight folds (F1 and F2) in pyrite layers relate to a ductile deformation stage during progressive regional metamorphism. Peak metamorphic conditions around 550°C, an estimation supported by garnet–biotite thermometry, resulted in annealing of pyrite grains, while porphyroblastic growth of pyrite (up to 900 µm) took place along the retrogressive path. Brittle deformation of pyrite and growth of irregular pyritic mass around such fractured porphyroblasts characterize the waning phase of regional metamorphism. A subsequent phase of stress-free, thermal metamorphism is recorded in the decussate and rosette textures of arsenopyrite prisms replacing irregular pyritic mass. Annealing of such patchy pyrite provides information regarding the temperature conditions during this episode of thermal metamorphism which is consistent with the hornblendehornfels facies metamorphism interpreted from magnetite–ilmenite geothermometry (550°C) and sphalerite geobarometry (3.5 kbar). A mild cataclastic deformation during the penultimate phase produced microfaults in twinned arsenopyrite prisms.

scholarly journals Unusual dyspnea in a hemodialysis patient: A case report

10.3823/2607 ◽  
2019 ◽  
Vol 12 ◽  
Author(s):  
Ching-Hsiang Wang ◽  
Jenq-Shyong Chan ◽  
Chung-Chi Yang ◽  
Po-Jen Hsiao
Keyword(s):  
Hemodialysis Patient ◽  
Pleural Cavity ◽  
Middle Age ◽  
Clinical Symptoms ◽  
Rapid Development ◽  
Previous History ◽  
Final Diagnosis ◽  
Spontaneous Hemothorax ◽  
Life Threatening ◽  
History Of

The typical clinical symptoms of hemothorax include a rapid development of chest pain or dyspnea, which may be life-threatening without immediate management. As we know, spontaneous hemothorax, a collection of blood within the pleural cavity without previous history of trauma or other cause, which usually onsets suddenly. The early and accurate diagnosis of spontaneous hemothorax is imperative in clinical practice. We reported a middle-age male undergoing regular hemodialysis was referred to our emergency department due to unknown cause of dyspnea and acute respiratory failure. Chest radiography revealed bilateral patchy infiltration of lung. Pleural tap analysis showed exudative pleural effusion with numerous red blood cells. Video-assisted thoracic surgery (VATS) were performed and confirmed the final diagnosis of spontaneous hemothorax. He was then successfully treated with the surgery of VATS combined chest tube thoracostomy.

scholarly journals Using Network Analysis to Study the History of Archival Collections Formation: A Case-Study of the Collection of N.P. Likhachev from the Scientific Historical Archive of the St. Petersburg Institute of History

2020 ◽  
pp. 277-292
Author(s):  
Ekaterina I. Nosova ◽  
Keyword(s):  
Network Analysis ◽  
Rapid Development ◽  
Petersburg Institute ◽  
Russian Academy Of Sciences ◽  
Historical Archive ◽  
European Section ◽  
History Of ◽  
Western European ◽  
Academy Of Sciences

Interest in the history of book collections is not a recent phenomenon. However, rapid development of computers and the Internet over the past twenty years has provided researchers with new tools for network analysis, such as UCI6 и NetDraw 2.160. Continuing to identify the provenance of the documents kept in the Western European Section of the Scientific Historical Archive of the St. Petersburg Institute of History of the Russian Academy of Sciences, the author had to face the fact that abundance of information and complexity of the links between various sources make it difficult to make out the complete picture. The Western European section of the Scientific Historical Archive of the St. Petersburg Institute of History of the Russian Academy of Sciences is mostly based on the collection of the academician N P. Likhachev (1862—1936). N.P. Likhachev contacted hundreds of antiquarian firms around the world, and thus his collection fits into the complex and interwoven system of the European antiquarian market of the late 19th–early 20th century. To overcome the problem of branching data, the author decided to call on the experience of sociologists and to use computer programs for network analysis that enable to reflect and comprehend the links between objects. The article is to present the process and results of this work, as well as to underscore problems and specificity of the programs in relation to the archival material. The main source is data from the personal provenance archive of the academician N. P. Likhachev, collection of documents on the history of the Western European Section, and artifacts from the Likhachev collection. The second layer of sources is antiquarian catalogs. The program can visualize these two layers of information in different ways by using different colors and lines. Overlaying of the schemes allows completing of missing elements in the chain of provenance. It should be noted that due to the richness of the sources, the network, originally compiled for the collection of N.P. Likhachev, grows into a pan-European system of “collector-antiquarian” relationships. It opens wide perspectives for research.

scholarly journals Green Building in Russia as well as its problems and solutions

2021 ◽  
pp. 53-58
Author(s):  
Nikolai Tuzov
Keyword(s):  
Rapid Development ◽  
Green Building ◽  
Individual Development ◽  
Capital Investments ◽  
Green Construction ◽  
Problems And Solutions ◽  
History Of ◽  
The Moment ◽  
Under Construction ◽  
Ecological Construction

The article deals with the issues of environmental (“green”) construction in Russia in relation to the tasks of low-rise and individual development. The article describes the history of the formation of the ecological construction market in Russia and abroad, gives a general classification and the main directions of its development. The ad-vantages of green construction, the problems that hinder the rapid development of ecological construction and the stimulating factors of such development are described. The applicable standards of green construction are indicated, both established by the state in the form of normative legal acts, and voluntary, and the advantages of following environmental standards are shown. Practical examples of ecological construction and problems faced by developers in practice are given. The concepts of Passive House, energy-efficient house and non-volatile house are considered in detail, indicating the ways to use the elements of such concepts in the implementation of real construction at the moment, including some practical examples of technical and technological solutions, as well as ways to further improve them. Examples of low-rise buildings currently under construction using standards and principles of ecological construction are given. The Russian standards of green construction are considered in de-tail, with references to specific regulations and other sources regulating the issues of ecological construction, and the ways of their further development and improvement are indicated. A mathematical model of the order of construction of eco-mobility facilities is proposed, where the capital return indicator is selected as an important criterion, which is determined taking into account the different times of costs for the objects being introduced. Its maximization leads to the choice of such an option, which will be characterized by the largest intermediate volume of input objects, as well as the smallest amount of reduced capital investments, i.e. their more rational dynamics. Thus, this indicator characterizes the efficiency of using capital investments, as well as their return as a result of reducing construction in progress.

scholarly journals Tracing the Life of a Buddhist Literary Apologia: Steps in Preparation for the Study and Translation of Sokdokpa’s Thunder of Definitive Meaning

Religions ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 933
Author(s):  
James Duncan Gentry
Keyword(s):  
Tibetan Buddhism ◽  
17Th Century ◽  
Literary Works ◽  
Historical Approach ◽  
Fine Grained ◽  
History Of ◽  
Magnum Opus ◽  
Shed Light

This article discusses Buddhist apologetics in Tibet by examining the formation, revision, and reception of the most renowned literary apologia ever written in defense of the Old School of Tibetan Buddhism: Sokdokpa Lodrö Gyeltsen’s early 17th-century magnum opus the Thunder of Definitive Meaning. It reconstructs in broad strokes the history of the Thunder’s reception from the early 17th century to the present and relates this to details in different versions of the Thunder and its addendum to shed light on the process by which this work was composed and edited. By considering this work’s peculiar context of production and history of reception alongside passages it presents revealing how it was conceived and revised, this analysis aims to prepare the ground for its study and translation. In so doing, this discussion attempts to show how a broadly historical approach can work in tandem with a fine-grained philological approach to yield fresh insights into the production and reception of Buddhist literary works that have important ramifications for their understanding and translation.

Ultrahigh-temperature metamorphism and decompression history of sapphirine granulites from Rajapalaiyam, southern India: implications for the formation of hot orogens during Gondwana assembly

2009 ◽  
Vol 147 (1) ◽  
pp. 42-58 ◽  
Author(s):  
T. TSUNOGAE ◽  
M. SANTOSH
Keyword(s):  
Southern India ◽  
Stability Field ◽  
Fine Grained ◽  
History Of ◽  
Peak Metamorphism ◽  
Gondwana Supercontinent ◽  
Isothermal Decompression ◽  
Ultrahigh Temperature ◽  
Late Neoproterozoic ◽  
Uht Metamorphism

AbstractSapphirine-bearing Mg–Al granulites from Rajapalaiyam in the southern part of the Madurai Block provide critical evidence for Late Neoproterozoic–Cambrian ultrahigh-temperature (UHT) metamorphism in southern India. Poikiloblastic garnet in quartzo-feldspathic and pelitic granulites contain inclusions of fine-grained subidioblastic to xenoblastic sapphirine associated with quartz, suggesting that the rocks underwent T > 1000°C peak metamorphism. Quartz inclusions in spinel within garnet are also regarded as clear evidence for a UHT condition. Inclusions of orthopyroxene within porphyroblastic garnet in the sapphirine-bearing rocks show the highest Al2O3 content of up to 10.3 wt%, suggesting T = 1050–1070°C and P = 8.5–9.5 kbar. Temperatures estimated from ternary feldspar and other geothermometers (T = 950–1000°C) further support extreme thermal metamorphism in this region. Xenoblastic spinel inclusions in sapphirine coexisting with quartz suggest that the spinel + quartz assemblage pre-dates the sapphirine + quartz assemblage, probably implying a cooling from T ~ 1050°C or an anticlockwise P–T path. The FMAS reaction sapphirine + quartz + garnet → orthopyroxene + sillimanite indicates a cooling from the sapphirine + quartz stability field after the peak metamorphism. Corona textures of orthopyroxene + cordierite (± sapphirine), orthopyroxene + sapphirine + cordierite, and cordierite + spinel around garnet suggest subsequent near-isothermal decompression followed by decompressional cooling toward T = 650–750°C and P = 4.5–5.5 kbar. The sapphirine–quartz association and related textures described in this study have an important bearing on the UHT metamorphism and exhumation history of the Madurai Block, as well as on the tectonic evolution of the continental deep crust in southern India. Our study provides a typical example for extreme metamorphism associated with collisional tectonics during the Late Neoproterozoic–Cambrian assembly of the Gondwana supercontinent.

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