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PGE and isotopic characteristics of Shergol and Suru Valley Ophiolites,Western Ladakh:Implications for supra-subduction tectonics along Indus Suture Zone

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Geoscience Frontiers 2021年第3期12卷 473-488页

作者： Irfan Maqbool Bhat talat ahmad D.V.Subba Rao Srinivasan Balakrishnan N.V.Chalapathi Rao Department of Earth Sciences University of KashmirSrinagar 190006India Vice Chancellors Office University of KashmirSrinagar 190006India Geochemistry Division CSIR-National Geophysical Research Institute(NGRI)Hyderabad 500007India Department of Earth Sciences Pondicherry UniversityPuducherry 605014India Centre of Advanced Study in Geology Institute of ScienceBanaras Hindu UniversityVaranasi 221005India

Present study reports the PGE-geochemistry of mantle peridotites and Nd-isotope geochemistry of arc related mafic rocks from the Indus Suture Zone(ISZ),western *** total PGE concentration of the Shergol and Suru Valley peridotites(∑PGE=96-180 ppb)is much higher than that of the primitive mantle and global ophiolitic mantle *** studied peridotites show concave upward PGE-distribution patterns with higher palladium-group PGE/Iridium-group PGE ratios(i.e.,0.8-2.9)suggesting that the partial melting is not the sole factor responsible for the evolution of these *** observed PGE-distribution patterns are distinct from residual/refractory mantle peridotites,which have concave downward or flat PGE-distribution *** enrichment of palladium-group PGE as well as other whole-rock incompatible elements(e.g.,LILE and LREE)and higher Pd/Ir ratio(1.1-5.9)reflects that these peridotites have experienced fluid/melt interaction in a supra-subduction zone(SSZ)tectonic ***,the Shergol mafic intrusives and Dras mafic volcanics,associated with the studied peridotites,have high^(143)Nd/^(144)Nd ratios(i.e.,0.512908-0.513078 and 0.512901-0.512977,respectively)and positiveε_(Nd)(t)(calculated for t=140 Ma)values(i.e.,+5.3 to+8.6 and+5.1 to+6.6,respectively),indicating derivation from depleted mantle sources within an intra-oceanic arc setting,similar to Spongtang and Nidar ophiolites from other parts of Ladakh *** transition from SSZ-type Shergol and Suru Valley peridotites to Early Cretaceous tholeiitic Shergol mafic intrusives followed by tholeiitic to calc-alkaline Dras mafic volcanics within the Neo-Tethys Ocean exhibit characteristics of subduction initiation mechanism analogous to the Izu-Bonin-Mariana arc system within western Pacific.

关键词： PGE Nd-isotope Mantle peridotites Ophiolites Ladakh Neo-Tethys Ocean

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SARS-CoV-2 Seroprevalence in People Referred to Private Medical Laboratories in Different Districts of Tehran, Iran from May 2020 to April 2021

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Virologica Sinica 2021年第5期36卷 1236-1240页

作者： Zahra Heydarifard Sevrin Zadheidar Jila Yavarian Shirin Kalantari ahmad Nejati talat Mokhtari-Azad Nazanin Zahra Shafiei-Jandaghi Virology Department School of Public HealthTehran University of Medical SciencesTehran ***Iran

Dear Editor,The first cases of severe acute respiratory syndrome coronavirus 2(SARS-Co V-2)in Iran were identified in Qom on February 19,2020,which soon spread throughout the country(Yavarian et al.2020).As of May 12,2021,2,691,352 confirmed cases of COVID-19(the disease caused by SARS-Co V-2)and 75,568 associated deaths have been reported in the country by Iran Ministry of Health.

关键词： acute respiratory

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A Systematic Review of Observational Studies, Demonstrating Smoking among School Going Adolescents

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Open Journal of Epidemiology 2019年第2期9卷 173-189页

作者： Shafquat Rozi Gillian Lancaster Sadia Mahmud Zahid ahmad Butt talat Roome Nida Zahid Department of Community Health Sciences Aga Khan University Karachi Pakistan Department of Mathematics and Statistics Lancaster University Lancashire United Kingdom Visiting Faculty Department of Medicine Consultancy Department of Pediatrics & Child Health Aga Khan University Karachi Pakistan School of Population and Public Health University of British Columbia Vancouver Canada Department of Pathology Dow University of Health Sciences Karachi Pakistan Department of Surgery Aga Khan University Karachi Pakistan

Objective: To characterize the methods of design and analysis currently adopted in survey research of school-based observational studies for smoking, and to identify the common pitfalls made by researchers. Methods: The systematic review was conducted in 2009 and consisted of observational studies in school settings published between January 2005 and January 2009. Smoking status was the main outcome of interest. Following Cochrane style, five steps were followed: setting selection criteria for studies and conducting a literature search;review of abstracts;review of complete articles;data extraction and quality assessment of included studies;and, finally, synthesis of studies. Results: Of the 292 abstracts retrieved, 45 (15.4%) articles were selected for the final review. Inconsistencies were found in the definition of smoking behaviour which impeded generalisability. Individual-level factors had importance, but environmental level factors were also important in studying the aetiology of smoking. Results showed that studies inappropriately reported sample size estimation and important confounding factors. Hierarchical linear modelling, random effects modelling and structural equation modelling were employed in comparatively few studies. Conclusions: There were concerns regarding data analysis of complex surveys. Fifty five percent of reviewed studies ignored environmental effects which may have produced unreliable inferences. Multi-level analysis assisted in understanding school-level effects.

关键词： Adolescent Smoking Observational Studies School-Based Survey

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