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Mineralogy and geochemistry of trachytic rocks from the Lichi Volcanics, Eastern Himalaya: insights into the Kerguelen mantle plume activity in the Eastern Himalayan Region

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Acta Geochimica 2024年第1期43卷 180-197页

作者： pallabi basumatary Deepshikha Borah Hiredya Chauhan Tribujjal Prakash Bibhuti Gogoi Department of Geology Cotton UniversityGuwahatiAssam 781001India Wadia Institute of Himalayan Geology DehradunUttarakhand 248001India

The Lichi volcanics are a suite of mafic-intermediate-felsic rocks and are considered coeval with the Abor volcanics(~132 Ma) of the Siang window in the Eastern Himalaya. Here, we present the first report of trachytic rocks from the Lichi volcanics, which are exposed in the Ranga valley, along the Kimin-Yazali road section in the Eastern Himalayan Region, Northeast India. The trachytes occur in close association with sandstones of the Gondwana Group of rocks and are characterised based on field, petrographical, and geochemical *** fine-grained trachytes are composed of alkali feldspar, biotite, plagioclase, sodic-amphibole, apatite, illmenite, and titanite. The REE profiles of the evolved trachytic rocks(higher SiO_(2)content) display fractionated trends. The fractionation of accessory mineral phases, like apatite and titanite, was possibly responsible for the strongly fractionated REE patterns of the evolved *** trachytic rocks demonstrate high apatite saturation temperatures of 988 ± 14 ℃(1σ, n = 8). The Aluminium Saturation Index(< 1.1) and binary discrimination diagrams of these peralkaline trachytes define their affinity with A-type granitoids. Elemental ratios like Y/Nb, Nb/U,and Ce/Pb signify that the Lichi trachytes are differentiated products of mantle-derived ocean island basalts. Trace elemental discrimination diagrams Th/Yb versus Nb/Yb, Y versus Nb, and Y + Nb versus Rb reflect a within-plate tectonic regime for the trachytes. From the results presented in this work, we infer that the development of rifting events during the breakup of eastern Gondwana due to the onset of Kerguelen plume activity further led to underplating of basic magma in lower crustal levels. These parental basaltic magmas underwent fractionation processes forming differentiated trachyandesites and *** into consideration the similarities recorded between the Lichi volcanics and Abor volcanics, this study supports the idea that Kerguelen plume ac

关键词： Peralkaline trachytes Trachyandesites A-type granitoids Apatite saturation temperature Abor volcanics Eastern Gondwana

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Petrogenesis of the Borjuri diorite pluton in the Mikir Massif of Northeast India:implications for post-collisional intermediate magmatism during the Pan-African orogeny

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Acta Geochimica 2023年第4期42卷 747-764页

作者： Tribujjal Prakash Ashima Saikia pallabi basumatary Bibhuti Gogoi Department of Geology Cotton UniversityGuwahatiAssam 781001India Department of Geology University of DelhiDelhi 110007India

The Assam-Meghalaya Gneissic Complex(AMGC)of northeast India contains numerous Pan-African granitic bodies that have been attributed to post-collisional rift-related *** present study is concerned with the first appraisal of intermediate magmatism(diorite,monzonite,and monzodiorite)found in the Borjuri Pluton of Mikir Massif,which is the eastern extension of *** diorites are strongly metaluminous and exhibit enriched LREE([La/Yb]N=1.63–7.37)with respect to HREE([Gd/Yb]N=1.95–2.27).The studied rocks do not show any mineralogical or textural indication of *** discrimination diagrams indicate that these rocks originated in a within-plate tectonic *** lower Mg#(33.49–38.69),low Cr(below detection limit),and Ni(27–41 ppm)contents along with elemental ratios such as Rb/Sr(0.32–0.95),La/Nb(0.49–4.21),and Nb/Ce(0.11–0.64)suggest a crustal source for the *** diagrams coupled with elemental ratios suggest that these rocks originated due to partial melting of mafic components in the crust with possible contribution from mantle *** P–T conditions of diorite emplacement(7.4 kbar,688℃)were calculated using the amphibole-plagioclase *** and geochronological data of the Pan-African felsic plutons reported from the AMGC indicate that these rocks were emplaced in a post-collisional extensional *** Borjuri Pluton is in close proximity with the Kathalguri Pluton,which has been reported as a product of PanAfrican *** view of the numerous extensional Pan-African felsic magmatism reported from the AMGC and based on the close vicinity of the Borjuri diorites with the Kathalguri granites,we speculate that the Borjuri diorites are products of the Pan-African post-collisional magmatism.

关键词： Granites Rift-related magmatism Intermediate magmatism Within-plate tectonic setting Kathalguri Pluton Assam-Meghalaya Gneissic Complex

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Magma mixing dynamics in a vertically zoned granitic magma chamber inferred from feldspar disequilibrium assemblage and biotite composition: a case study from the Mikir Massif,eastern India

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Acta Geochimica 2022年第3期41卷 453-469页

作者： Gaurav Hazarika pallabi basumatary Tribujjal Prakash Hiredya Chauhan Bibhuti Gogoi Department of Geology Cotton UniversityGuwahatiAssam 781001India Inter University Accelerator Centre New Delhi 110067India

The Kathalguri Pluton is a granitic pluton confined within the Palaeo-Mesoproterozoic Shillong Group of rocks in the Mikir Massif, eastern India. The pluton is vertically zoned characterized by lower medium-to coarsegrained equigranular to porphyritic granite and upper finegrained equigranular granite. Small to large mafic magmatic enclaves(MME) are distributed within the lower granite, while homogeneous grey-coloured hybrid rocks dominate the upper granite. From field relationships, textural features, and mineral chemical analyses we infer that the Kathalguri Pluton was a vertically zoned felsic magma chamber that was intruded by mafic magma during its evolution. The lower portion of the magma chamber was occupied by crystal mush, while the upper portion was dominated by melt when mafic magma intruded it. The occurrence of upper and lower zonations was probably brought about by fractional crystallization. The presence of such zonations within the felsic reservoir caused the mafic magma to interact with the two distinct zones differently,forming MME in the lower granite and homogeneous hybrid rocks in the upper portion. The plagioclase compositions of the larger MME, smaller MME, hybrid rocks,and granitic host rocks vary between An;–An;, An;–An;, An;–An;,and An;–An;respectively. The alkali feldspar compositions of the hybrid rocks range from Or;to Or;, while that of the host granite varies from Or;to Or;. The biotite is eastonitic and siderophyllitic in composition, while the pyroxene is diopside. The apparent pressure range of biotite crystallization in the granitic rocks was calculated at 1.93 to 2.28 kbar, while the biotite crystallization temperature for the different rock types is in the range of 628 and 759 ℃. Oxygen fugacity estimates from the biotite suggest that the Kathalguri magmas crystallized at fO;conditions above the nickel-nickel oxide(NNO) buffer. Distinct disequilibrium textures indicating mixing and mingling between the mafic and felsic magmas are

关键词： Mafic magmatic enclaves Hybrid rocks Orthoclase-microcline transformation Shillong Group Kathalguri pluton

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An Analysis of the Lifestyle and Mental Health Status of Adult People Living in Dhaka City: A Cross-Sectional Study in Post COVID-19 Era

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Advances in Infectious Diseases 2024年第2期14卷 393-410页

作者： Tania Ahmed Chowdhury Nasrin Akhter Ishrat Hossain Rezwana Jahan pallabi Sultana Mohammad Jahangir Alam Radda MCH-FP Centre Dhaka Bangladesh Center for Higher Studies and Research (CHSR) Bangladesh University of Professionals (BUP) Dhaka Bangladesh

Introduction: The Novel Coronavirus or COVID-19 affected all the megacities of the world and made the mental health and lifestyle of people paralyzed. According to different studies, such difficulties were different in scale in different cities depending on the demographic attributes of the people. This phenomenon has created the essence of the current study to examine the health conditions in terms of their mental health, lifestyle, and demographic attributes during and immediate past of the COVID-19 era. Method: It was a cross-sectional study covering the people of Dhaka City Corporation. For this purpose, a multistage sampling method was applied, under which the respondents were selected randomly and a self-administered structured questionnaire was used to collect data. The questionnaire was developed based on the DASS 21, as it was suitable to measure the components of mental health in the form of depression, anxiety, and stress. Descriptive analysis and cross-tabulation were applied to find out the association between dependent and independent variables, whereas, a chi-square test was performed to examine the hypothesis. Finally, multivariate analysis was done to find out the risk factors. Three logistic regression models were developed for three dependent variables. Result: The findings of the analysis revealed that the lifestyle of people had severely influenced the components of their mental health conditions during and immediate past of COVID-19 in the Dhaka City Corporation, which varies to some extent depending on the demographic attributes of those. Conclusion: The above findings are statistically significant enough to conclude about the essence of taking preventive measures regarding mental health issues in the future. However, the limitations of this study-keeping it within the urban areas and the educated people, have also created the venue for future researchers to move with their research endeavors in the rural areas nationwide and thus generalize t

关键词： Lifestyle Mental Health Depression Stress Anxiety Dhaka City DASS 21 COVID-19

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Effects of Green Silver Nanoparticles on Soil Quality and Induced Germination: A Future Alternative Fertilizer or Environmental Toxicant?

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NASS Journal of Agricultural Sciences 2019年第1期1卷 18-25页

作者： pallabi Das Chaitali Roy Chowdhuri Soma Barman Soil and Agro Bio-engineering Lab Department of Environmental ScienceTezpur UniversityTezpur-784028India

Silver nanoparticles(AgNP)synthesized from It influenced the inherent soil properties like bulk density(BD),water holding capacity(WHC),available N,P,K,urease,phosphatase activity and *** apparent increment WHC,N,P,K,urease,and phosphatase in soil were observed whereas reduction of BD was *** to application of nanosolutions the pH of the soil shifted towards neutrality from 0 to 60 ***,they also did not have any toxicity upon plant as well as earthworm ecosystem.

关键词： AgNP Soil property Phytotoxicity Earthworm

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