scholarly journals First Report of Florencite from the Singhbhum Shear Zone of the East Indian Craton

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Maitrayee Chakraborty ◽  
Sayan Biswas ◽  
Nandini Sengupta ◽  
Pulak Sengupta
Keyword(s):  
Shear Zone ◽  
Small Proportion ◽  
Indian Shield ◽  
First Report ◽  
Precambrian Rocks ◽  
East Indian ◽  
Singhbhum Shear Zone ◽  
Geological Features ◽  
The World ◽  
Indian Craton

Metamorphic florencite is being reported from kyanite-rich rocks from the eastern part of the Palaeo- to Mesoproterozoic Singhbhum shear zone. This is the first report of florencite from the Precambrian rocks of the Indian Shield. Host rock of florencite is a kyanite-rich rock (>80  vol%) with small and variable amounts of quartz, lazulite, augelite, and rutile. Florencite forms small (<20 microns) idioblastic-to-subhedral crystals that are included in large kyanite grains. Rarely, florencite replaces kyanite. The florencite has small proportion of crandallite (8.7–11.8 mol%) and goyazite (<2 mol%) components. Florencite of this study is dominated by Ce (~49 mol%) with significant La (~30 mol%) and Nd (~21 mol%). Compared to other florencite occurrences of the world, florencite of the studied rock is impoverished in S, Sr, and Ba and rich in P. Stability of the assemblage florencite-kyanite-augelite-lazulite and the quantitative thermobarometry in the adjoining rocks suggest that florencite was formed during Palaeoproterozoic metamorphism that culminated at the P-T range of 490±40∘C and 6.3±1 kbar. Integrating all the geological features it is postulated that florencite was formed due to metasomatism of some aluminous protolith by infiltration of acidic fluids charged with PO4-3 and LREE.

Geological, geochemical and geophysical studies on the non-volcanic hot springs, Atri and Tarbalo in the Indian shield: potential unconventional renewable energy sources

2021 ◽  
Author(s):  
Asmita Maitra ◽  
Saibal Gupta ◽  
Anand Singh ◽  
Tirumalesh Kessari
Keyword(s):  
Renewable Energy ◽  
Shear Zone ◽  
Geothermal Energy ◽  
Hot Springs ◽  
Hot Water ◽  
Eastern Ghats ◽  
Tectonic Activity ◽  
Indian Shield ◽  
Thermal Groundwater ◽  
The World

&lt;p&gt;In the fast-growing economies around the world, the demand for energy as well as environmental concerns make geothermal energy a potential renewable energy source. Most geothermal provinces across the world have the capacity to generate enormous amounts of hydrothermal energy, and hot springs in these areas are generally associated with active volcanic or tectonic activity. With modern technical advancement, low enthalpy geothermal systems (&lt; 100&amp;#176;C) are also being considered for geothermal energy production. In non-volcanic hot springs, the water temperature remains low compared to volcanic hot springs. We study two such hot springs located within Neoproterozoic granulites of the tectonically stable Eastern Ghats Belt (EGB) of the Indian shield. The source of heat for these amagmatic hot springs may either be deep-seated fracture zones, or alternative heat sources at shallow crustal levels. A combination of geological, geochemical, hydrological and geophysical techniques has been applied to characterize non-volcanic hot springs in India. The hot springs at Atri and Tarbalo are located to the south of the Mahanadi Shear Zone within the EGB. Penetrative granulite facies planar structural fabrics in rocks of the northern EGB are reoriented within an E-W striking, northerly dipping ductile shear zone that is subsequently dissected by WNW-ESE trending, sub-vertical pseudotachylite-bearing faults and fractures. Tube and dug wells around the shear zone yield both hot (~ 60&amp;#176;C) and cold (~ 28&amp;#176;C) water, sometimes spatially only 20 metres apart. Chemical analyses indicate both have distinct compositions, with hot waters rich in Na&lt;sup&gt;+&lt;/sup&gt;, K&lt;sup&gt;+&lt;/sup&gt; and Cl&lt;sup&gt;-&lt;/sup&gt; while cold-waters have higher Ca&lt;sup&gt;2+&lt;/sup&gt; and HCO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; concentration. Stable isotope analyses (&amp;#948;&lt;sup&gt;2&lt;/sup&gt;H and &amp;#948;&lt;sup&gt;18&lt;/sup&gt;O) of both waters indicate that both are meteoric in origin. Tritium (&lt;sup&gt;3&lt;/sup&gt;H) and &lt;sup&gt;14&lt;/sup&gt;C analyses indicate that hot spring waters are much older than the non-thermal groundwater. The hot water is 17714 years old, while the non-thermal groundwater indicates modern day recharge. This suggests that both waters come from different reservoirs. VLF-electromagnetic studies indicate that water exists in isolated pockets beneath the crystalline country rocks, but also circulated through WNW-ESE trending fracture systems. Heat production studies reveal that the EGB is a high radiation zone, and some host rocks have exceptionally high heat producing element (HPE) concentrations (primarily thorium) within the minerals monazite and thorite. Hence, meteoric water is entrapped in those &amp;#8220;perched aquifers&amp;#8221; near HPE-rich pockets for a long duration and has sufficient time to undergo radiogenic heating, shielded from the non-thermal groundwater circulating within the fracture system. These isolated pockets act as sources for the hot springs,with HPE being the source of heat. The high HPE distribution in the crust resulting from Neoproterozoic geological events has, thus, elevated the present-day equilibrium geotherm in the EGB, forming sources for shallow-level, non-volcanic hot springs within a tectonically inactive terrane. Therefore, the hot springs in these regions, as well as the hot dry rocks of these areas can be considered as potential geothermal resources.&lt;/p&gt;

First report of Rinamba opacicollis Cameron (Hymenoptera: Braconidae, Doryctinae) in India as parasitoid of coffee stem borer, Xylotrechus quadripes (Chevrolat) (Coleoptera: Cerambycidae)

ENTOMON ◽  
2020 ◽  
Vol 44 (4) ◽  
pp. 311-314
Author(s):  
A. Roobakkumar ◽  
H.G. Seetharama ◽  
P. Krishna Reddy ◽  
M.S. Uma ◽  
A. P. Ranjith
Keyword(s):  
Integrated Control ◽  
Host Record ◽  
Stem Borer ◽  
Arabica Coffee ◽  
First Report ◽  
The World ◽  
First Time

Rinamba opacicollis Cameron (Hymenoptera: Braconidae) was collected from Chikkamagaluru, Karnataka, India for the first time from the larvae of white stem borer, Xylotrechus quadripes Chevrolat infesting arabica coffee. Its role in the biological or integrated control of X. quadripes remains to be evaluated. White stem borer could be the first host record of this parasitoid all over the world.

EAST INDIAN AND OTHER DOCKS IN LONDON: IMPERIAL ARCHITECTURE, COLONIAL TRADE AND POSTCOLONIAL MEMORY

2020 ◽  
pp. 190-205
Author(s):  
S. E. Sidorova ◽  
Keyword(s):  
20Th Century ◽  
Industrial Revolution ◽  
Historical Memory ◽  
Visual Image ◽  
East Indian ◽  
Architectural Representation ◽  
The World ◽  
The Status ◽  
Postcolonial History ◽  
The City

The article concentrates on the colonial and postcolonial history, architecture and topography of the southeastern areas of London, where on both banks of the River Thames in the 18th–20th centuries there were located the docks, which became an architectural and engineering response to the rapidly developing trade of England with territories in the Western and Eastern hemispheres of the world. Constructions for various purposes — pools for loading, unloading and repairing ships, piers, shipyards, office and warehouse premises, sites equipped with forges, carpenter’s workshops, shops, canteens, hotels — have radically changed the bank line of the Thames and appearance of the British capital, which has acquired the status of the center of a huge empire. Docks, which by the beginning of the 20th century, occupied an area of 21 hectares, were the seamy side of an imperial-colonial enterprise, a space of hard and routine work that had a specific architectural representation. It was a necessary part of the city intended for the exchange of goods, where the usual ideas about the beauty gave way to considerations of safety, functionality and economy. Not distinguished by architectural grace, chaotically built up, dirty, smoky and fetid, the area was one of the most significant symbols of England during the industrial revolution and colonial rule. The visual image of this greatness was strikingly different from the architectural samples of previous eras, forcing contemporaries to get used to the new industrial aesthetics. Having disappeared in the second half of the 20th century from the city map, they continue to retain a special place in the mental landscape of the city and the historical memory of the townspeople, which is reflected in the chain of museums located in this area that tell the history of English navigation, England’s participation in geographical discoveries, the stages of conquering the world, creating an empire and ways to acquire the wealth of the nation.

scholarly journals First report on the prevalence of Fasciola hepatica in the endangered Père David’s deer (Elaphurus davidianus) in China

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Si-Yang Huang ◽  
Jing-Zhi Gong ◽  
Yi-Jun Ren ◽  
Ming Pan ◽  
Wei-Min Cai ◽  
...  
Keyword(s):  
Fasciola Hepatica ◽  
Potential Threat ◽  
Prevalence Data ◽  
First Report ◽  
Natural Reserve ◽  
Zoonotic Parasite ◽  
The World ◽  
Père David’S Deer ◽  
Microscopy Examination ◽  
Elaphurus Davidianus

Abstract Background Fasciola hepatica is an important zoonotic parasite that causes fasciolosis in a broad range of animals. No information is available about the prevalence of F. hepatica in Père David’s deer (Elaphurus davidianus), an endangered species in the world. Therefore, the purpose of the study was to evaluate the prevalence of fasciolosis in Père David’s deer in the Dafeng Elk National Natural Reserve, Jiangsu province, China. Results In this study, 142 fecal samples from Père David’s deer were analyzed for F. hepatica by microscopy and nest-PCR. Only one sample was positive for F. hepatica according to microscopy examination, while 18 of 142 (12.68, 95%CI: 2.841–22.45%) samples were positive for F. hepatica according to nest-PCR results. Conclusions This is the first report of prevalence of F. hepatica in Père David’s deer. The prevalence data indicated that F. hepatica was also present in this endangered animal, which may cause a potential threat to this precious species.

First Report of Sapphirine-bearing Rocks from the Palghat-Cauvery Shear Zone System, Southern India

2004 ◽  
Vol 7 (2) ◽  
pp. 620-626 ◽  
Author(s):  
M. Santosh ◽  
Toshiaki Tsunogae ◽  
Saori Koshimoto
Keyword(s):  
Shear Zone ◽  
Southern India ◽  
First Report

Aphelenchoides besseyi parasitizing cowpea (Vigna unguiculata) in Brazil

Plant Disease ◽  
2021 ◽  
Author(s):  
Luciany Favoreto ◽  
Rafaela Bueno ◽  
Angélica Calandrelli ◽  
Patrícia Priscila França ◽  
Mauricio Conrado Meyer ◽  
...  
Keyword(s):  
Common Bean ◽  
Vigna Unguiculata ◽  
Host Reaction ◽  
First Report ◽  
Cowpea Cultivars ◽  
The World ◽  
Cotton Plants ◽  
Aphelenchoides Besseyi ◽  
Leaf Deformation

Several species of nematodes are known to cause losses to cowpea (Vigna unguiculata) throughout the world. In Brazil, Aphelenchoides besseyi was recently described causing damages on soybean, cotton, and common bean, but no report was found about the parasitism of this nematode in cowpea. The present study aimed to verify the host reaction of cowpea cultivars to A. besseyi. The experiment was conducted under greenhouse conditions, using as inoculum two A. besseyi populations, obtained from symptomatic soybean and cotton plants collected in naturally infested fields. Cultivars ‘Imponente’, ‘Aracê’, ‘Guariba’, ‘Tumucumaque’, ‘Nova Era’, and ‘Tracuateua’ were inoculated with 500 A. besseyi of each population, separately, into soil and after 30 days from the inoculation nematodes were extracted from shoot systems. Both populations were able to parasitize all the cowpea cultivars. Independently of the cultivar, cowpea plants exhibited symptoms of leaf deformation similar to those described for soybean, cotton, and common bean and, in addition, severe brooming was observed and the interior of the stems was porous and necrotic. To our knowledge, this is the first report of parasitism by A. besseyi of cowpea in Brazil, under greenhouse conditions, increasing the list of hosts of this nematode.

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