Petrography, Provenance And Diagenesis Of Murree Group Exposed along Basohli- Bani Road, Kathua District, Jammu and Kashmir

2020 ◽  
Vol 37 (2) ◽  
pp. 15-26
Author(s):  
Monika Jamwal ◽  
S K Pandita ◽  
Meera Sharma ◽  
G M Bhat
Keyword(s):  
Subduction Zone ◽  
Burial Diagenesis ◽  
Jammu And Kashmir ◽  
Mechanical Compaction ◽  
Metasedimentary Rocks ◽  
Continental Block ◽  
Different Types ◽  
Quartz Grains

Sandstones of Murree Group of rocks exposed along Bani- Basohli road, Kathua District in Jammu were analyzed for petrography, petrofacies and provenance. These sandstones are classified as sublithic arenites and have been derived from mixed provenance including plutonic basement, sedimentary and metasedimentary rocks. Different types of quartz grains and other constituent minerals suggest the source from lower and middle and upper rank metamorphic terrains of the continental block-recycled orogen and subduction zone complex. The imprints of shallow burial diagenesis suggest low mechanical compaction probably just before cementation leading to moderate packing and reduction of porosity.  

Slab-derived fluid evolution induced from oxygen and hydrogen isotopes compositions of blueschist-facies phengites

2020 ◽  
Author(s):  
Tatsuki Tsujimori ◽  
Daniel Pastor-Galán ◽  
Antonio Álvarez-Valero
Keyword(s):  
Subduction Zone ◽  
Hydrogen Isotope ◽  
Hot Spring ◽  
Far East ◽  
Isotopic Fractionation ◽  
Metasedimentary Rocks ◽  
East Russia ◽  
Japan Subduction Zone ◽  
D Values ◽  
Sw Japan

<p>Phengite is the most common metamorphic mineral in H<em>P</em>-UH<em>P</em> metasedimentary rocks, which can convey H<sub>2</sub>O, LILEs (especially K, Ba, Cs and Rb), Li, B and N in their structure formed at depths up to 300 km. The breakdown of phengite in a downgoing oceanic slab would cause fluid-induced element transport into the overlying mantle wedge. We have investigated the <sup>2</sup>H/<sup>1</sup>H (D/H) and <sup>18</sup>O/<sup>16</sup>O ratios of twenty-four phengite separates from pelitic schists of the Devonian–Carboniferous Renge Belt (SW Japan), Permian Shaiginsky Complex (Far East Russia) and Cretaceous Sambagawa Belt (SW Japan).</p><p>We found the presence of the very light hydrogen isotope (δD < –95‰) in blueschist-facies phengites in the three different metamorphic belts. For example, phengite from the lawsonite- and epidote-grade metasedimentary schists of the Osayama Serpentinite Mélange (OSM) of the Renge Belt are characterized by negative hydrogen isotope compositions (δD values relative to VSMOW) ranging from –113 to –93.9‰ and oxygen isotope compositions (δ18O values relative to VSMOW) ranging from +12.9 to +14.6‰.</p><p>High-Si features and K–Ar ages of the investigated phengites deny the possibility of meteoric-hydrothermal alteration to have caused the low δD values. The light values might be attributed to isotopic fractionation during progressive metamorphic dehydration.Assuming a meamorphic temperatures range of 250–350°C for the OSM schists, the inferred metamorphic fluid compositions in blueschist-facies depth for that fossil slab had a range of δD = ~–40 to –75‰ and δ18O = ~+13 to +15‰. These values are significantly lighter than the slab-fluid induced from the Arima hot spring water in a forearc region of modern SW Japan subduction zone. Our study suggests that slab-derived fluids in ancient Pacific-type subduction zone are characterized by light hydrogen isotope and that the phengite breakdown can affect hydrogen isotope of nominally anhydrous minerals (NAMs) in the deep mantle.</p>

Geochemical and Nd isotopic constraints for the origin of eclogite protoliths, northern Cordillera: implications for the Paleozoic tectonic evolution of the Yukon-Tanana terrane

1999 ◽  
Vol 36 (10) ◽  
pp. 1697-1709 ◽  
Author(s):  
Robert A Creaser ◽  
Jo-Anne S Goodwin-Bell ◽  
Philippe Erdmer
Keyword(s):  
High Pressure ◽  
Subduction Zone ◽  
Convergent Margins ◽  
Metasedimentary Rocks ◽  
High Pressure Metamorphism ◽  
Distal Edge ◽  
History Of ◽  
Convergent Plate Margin ◽  
Ocean Ridge ◽  
Subduction Zone Magmatism

On the basis of trace-element data, basaltic protoliths for Paleozoic eclogites from the Yukon-Tanana terrane (YTT) have diverse origins. Eclogites from Stewart Lake and the Simpson Range have characteristics of basaltic protoliths generated by subduction-zone magmatism, are hosted by serpentinitic-gabbroic rocks, and record Mississippian high-pressure metamorphism and cooling. In contrast, eclogites from Faro, Ross River, and Last Peak show either within-plate geochemistry or mid-ocean ridge protolith geochemistry with a small subduction component, are hosted by continental metasedimentary rocks of the Nisutlin assemblage, and record Permian high-pressure metamorphism and cooling. We interpret these results to derive from the following tectonic events in the Paleozoic history of the YTT: (1) activity at a Devonian-Mississippian convergent plate margin at the distal edge of North America, with near-contemporaneous subduction-zone magmatism and high-pressure metamorphism; (2) Mississippian rifting of that margin to form the outboard YTT, the Slide Mountain marginal basin, and the Faro, Ross River, and Last Peak eclogite protoliths; and (3) west-dipping subduction of the Slide Mountain Ocean under the outboard YTT in Permian time, to produce the Faro, Ross River, and Last Peak eclogites and Permian arc magmatism throughout the YTT. The basaltic protoliths of the Paleozoic YTT eclogites bear close similarity to those produced in rifted convergent margins, such as the Miocene Japanese arc - back-arc system.

scholarly journals THE INFLUENCE OF MAGNITUDES TYPES IN THE NONEXTENSIVITY APPLIED AT THE CIRCUM-PACIFIC SUBDUCTION ZONES

2018 ◽  
Vol 36 (4) ◽  
pp. 1
Author(s):  
Thaís Machado Scherrer ◽  
George Sand França ◽  
Raimundo Silva ◽  
Daniel Brito de Freitas ◽  
Carlos da Silva Vilar
Keyword(s):  
Solid Earth ◽  
Subduction Zone ◽  
Subduction Zones ◽  
Time Interval ◽  
Data Sets ◽  
Data Set ◽  
Different Types ◽  
Data Source ◽  
The Impact

ABSTRACT. Following our own previous work, we reanalyze the nonextensive behavior over the circum-Pacific subduction zones evaluating the impact of using different types of magnitudes in the results. We used the same data source and time interval of our previous work, the NEIC catalog in the years between 2001 and 2010. Even considering different data sets, the correlation between q and the subduction zone asperity is perceptible, but the values found for the nonextensive parameter in the considered data sets presents an expressive variation. The data set with surface magnitude exhibits the best adjustments.Keywords: Nonextensivity, Seismicity, Solid Earth, Earthquake.RESUMO. No mesmo caminho do nosso trabalho anterior, reanalisamos o comportamento não extensivo sobre as zonas de subducção do círcuo de fogo do Pacífico, avaliando o impacto do uso de diferentes tipos de magnitude nos resultados. Utilizamos o mesmo intervalo de dados e fonte de nosso trabalho anterior, do catálogo NEIC entre os anos 2001 e 2010. Mesmo considerando diferentes conjuntos de dados, a correlação entre q e a aspereza das zonas de subducção é perceptível, mas os valores encontrados para o parâmetro não extensivo no conjuntos de dados considerados apresentam uma variação expressiva. O conjunto de dados com magnitude de superfície exibe os melhores ajustes.Palavras-chave: Não extensividade, Sismicidade, Terra Sólida, Terremotos.

scholarly journals Differences in Epicentral Location of Mexican Earthquakes between Local and Global Catalogs: An update

2016 ◽  
Vol 55 (1) ◽  
Author(s):  
Vala Hjörleifsdóttir ◽  
Shri Krishna Singh ◽  
Allen Husker
Keyword(s):  
Subduction Zone ◽  
Velocity Structure ◽  
The United States ◽  
The State ◽  
The Pacific ◽  
Different Types ◽  
The Pacific Ocean ◽  
Epicentral Location ◽  
Large Earthquakes ◽  
Mexican Subduction Zone

Differences in epicentral locations between local and global catalogs for earthquakes in the Mexican subduction zone were first observed to be biased in the 1980s, based on a few well studied events. In this study we compare locations between two local catalogs; (1) a recent high precision catalog of events in the state of Guerrero and (2) the catalog of the Servicio Sismológico Nacional (SSN), to the global catalog of the United States Geological Service (USGS). We find that on average epicentral locations in the global catalog of earthquakes larger than M 5 in the Mexican subduction zone are 26 km towards N54°E of those in the local catalogs. We investigate how the errors vary for different types of earthquakes in Guerrero, and how they vary along the trench, from the state of Jalisco to the state of Chiapas. The average differences are largest for thrust events occurring close to the trench, and for events in Michoacán. The differences are greater on average for large earthquakes than for small. There is a trade-off between the distance from the trench and timing, suggesting a poor resolution of these parameters, due to the lack of stations the Pacific Ocean. We attribute the differences in locations to systematic patterns in the velocity structure of the mantle, with consistently fast paths to the northeast and relatively slow paths towards the southwest.

Subduction zone metamorphic pathway for deep carbon cycling: I. Evidence from HP/UHP metasedimentary rocks, Italian Alps

2014 ◽  
Vol 386 ◽  
pp. 31-48 ◽  
Author(s):  
Jennie Cook-Kollars ◽  
Gray E. Bebout ◽  
Nathan C. Collins ◽  
Samuel Angiboust ◽  
Philippe Agard
Keyword(s):  
Carbon Cycling ◽  
Subduction Zone ◽  
Italian Alps ◽  
Metasedimentary Rocks

An Evaluative study of tourism Industry in Jammu and Kashmir: A Northern state of India.

2018 ◽  
Vol 1 (1) ◽  
pp. 1-9
Author(s):  
Suresh Sachdeva ◽  
Ishfaq Ahmad Ganai
Keyword(s):  
Foreign Exchange ◽  
Cultural Exchange ◽  
Tourism Industry ◽  
The State ◽  
Jammu And Kashmir ◽  
Evaluative Study ◽  
The People ◽  
Different Types ◽  
Depth Study ◽  
Northern State

This paper attempts to make an in-depth study of tourism, which would help in developing the course of tourism industry in the state of Jammu and Kashmir. Tourism is considered as one sector that can propel growth, contribute foreign exchange, and provide employment that too to low skilled persons. One of the important dimensions of tourism is the cultural exchange among various nationalities and among the people of different states. As on one hand, tourism is seen as an economic option and on the other side the greater social and human effect. Jammu and Kashmir offers different types of tourism, which are highlighted in this paper, which type of tourism is most liked and is popular among tourists, is also presented in this paper for proper development of tourism industry in the state of Jammu and Kashmir Keywords: In-depth, Foreign exchange, community development, Harmony.

scholarly journals Monitoring of Mite Population and Pest Management Practices in some Apple Orchards in Kashmir Region

2019 ◽  
Vol 16 (2) ◽  
pp. 417-424
Author(s):  
Ishana Qadir ◽  
Ayesha Qamar
Keyword(s):  
Management Practices ◽  
Apple Scab ◽  
Sampling Technique ◽  
Mite Population ◽  
Apple Orchards ◽  
Pest Population ◽  
Sampling Device ◽  
Jammu And Kashmir ◽  
Different Types ◽  
Pesticide Usage

In the present study, a preliminary survey was carried out in two apple orchards (O1 and O2) belonging to the central region of the state of Jammu and Kashmir to ascertain the prevalence of different types of pests infesting the orchards across different phases, i.e., pre-bloom, bloom and post bloom which spread across the months of end March till the harvest stage (apple picking) in October. Among various types of pests documented, the incidence of red mites was highest. Apple scab was recorded highest in the post bloom stage. The mite population was recorded by using Binomial sampling technique and calculating the Cumulative Mite Days (CMD). Mite infested leaves were 24.8% and16% in O1 and O2 respectively. Similarly, CMD increased linearly in O1 reaching to a maximum of 7.17 on the last sampling day, whereas in the 2nd orchard it showed increased to 7.42 on the last sampling day. In addition to monitoring pest population, the pesticide usage regime was also studied and extensive usage of which was recorded in both the orchards. Yellow fly trap with its corresponding synthetic pheromone was used as quantitative sampling device in monitoring the general pest population

scholarly journals A review of disasters in Jammu and Kashmir, and Ladakh region in India

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Sangram Kishor Patel ◽  
Ankit Nanda ◽  
Govind Singh ◽  
Sunita Patel
Keyword(s):  
Early Warning Systems ◽  
Management Systems ◽  
Warning Systems ◽  
Development Programs ◽  
Jammu And Kashmir ◽  
The People ◽  
Different Types ◽  
The Government ◽  
Resilience Mechanisms ◽  
The Impact

India has always been a disaster-prone country, with multiple states afflicted by different types of disasters. The impact of these disasters is exacerbated when an area is prone to multiple types of disasters. This study attempts to understand the impact of natural and man-made disasters on the people of Jammu and Kashmir (J&K) and Ladakh region in India as well as it also examines the resilience mechanisms adopted by the people, and identifies measures taken by the government in response to these disasters. To understand these disasters’ dynamics, we conducted both offline and online desk reviews for this study. The review suggests that J&K and Ladakh region is afflicted not only by multiple natural disasters such as floods, earthquakes, avalanches, and landslides but also by the terrorism and violence, which has caused unparalleled death and destruction. These natural and man-made disasters have adversely affected most aspects of life and development in the region. To mitigate the risks, effective disaster risk reduction and management systems, early warning systems and infrastructure need to be strengthened. In addition, community engagement needs to be enhanced with the goal of addressing the grievances of the population and engaging them in the design and implementation of sustainable development programs.

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