John M. McArthur
University College London
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Publications 124
Abstract The Early Toarcian, organic-rich, black shales of the Cleveland Basin, Yorkshire UK, are the type sediments for the supposed early Toarcian oceanic anoxic event. The sediments have values of Cd/Mo that are 0.4. These values are typical of sediment deposited in modern basins that are hydrographically restricted and show that the Cleveland Basin was hydrographically restricted when depositing organic-rich sediments. These palaeo-proxies confirm earlier interpretations, based on Mo/TOC val...
#1Marco Rotiroti (University of Milano-Bicocca)H-Index: 7
#2Tullia Bonomi (University of Milano-Bicocca)H-Index: 7
Last. Barbara Leoni (University of Milano-Bicocca)H-Index: 13
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Abstract For several hundred years, farming in the Po Plain of Italy (46,000 km2, 20 million inhabitants) has been supported by intensive surface irrigation with lake and river water. Despite the longevity of irrigation, its effects on the quality and quantity of groundwater is poorly known and so is investigated here through seasonal measurements of hydraulic heads and water quality in groundwaters, rivers, lake, springs and rainwaters. In the north of the study region, an unconfined coarse-gra...
1 CitationsSource
#1John M. McArthur (UCL: University College London)H-Index: 45
This chapter in not a review of arsenic (As) in groundwater. It is, rather, a brief summary of As pollution in the areas shown in Fig. 12.1. For a comprehensive account of the problem of As worldwide, the reader is referred to Ravenscroft et al. (2009).
5 CitationsSource
#1Ruoqi Wan (China University of Geosciences)
#2Wenjian Liu (Queensborough Community College)
Last. Zhengrong Wang (CCNY: City College of New York)
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Abstract The ages of carbonate rocks can be determined by comparing their 87Sr/86Sr ratios with the well-established seawater 87Sr/86Sr curve. Current models and databases provide no explicit solution to the problem of accurately assigning uncertainties to derived ages when the 87Sr/86Sr ratios of carbonate rocks contain analytical uncertainties. This is particularly concerning as significant amount of 87Sr/86Sr ratios are being measured by multi-collector inductively-coupled-plasma mass-spectro...
#1Peter RavenscroftH-Index: 10
#2John M. McArthur (UCL: University College London)H-Index: 45
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A Sr-isotope chronostratigraphy is presented for Miocene sediments deposited by the “Paranense” Sea along 1200 km of the southwestern Atlantic coast of Argentina and Uruguay. Numerical ages were obtained for shells of Aequipecten paranensis from the Argentinean Puerto Madryn Formation, Facies Balneario La Loberia, “Entrerriense Beds” of the Salado Basin, and Parana Formation, and from the Camacho Formation (Uruguay). The87Sr/86Sr ages fall into five age-groups that encompass the “Paranense” floo...
3 CitationsSource
#1Sadaf Naseem (KU: University of Karachi)H-Index: 3
#2John M. McArthur (UCL: University College London)H-Index: 45
Groundwater beneath the alluvial plain of the Indus River, Pakistan, is reported to be widely polluted by arsenic (As) and to adversely affect human health. In 79 groundwaters reported here from the lower Indus River plain, in southern Sindh Province, concentrations of As exceeded the WHO guideline value of 10 g/L in 38%, with 22% exceeding 50 g/L, Pakistan’s guideline value. The As pollution is caused by microbially-mediated reductive dissolution of sedimentary iron-oxyhydroxides in anoxic gr...
7 CitationsSource
#1John M. McArthur (UCL: University College London)H-Index: 45
#2P. K. Sikdar (Indian Institute of Social Welfare and Business Management)H-Index: 7
Last. I. Sen (Indian Institute of Social Welfare and Business Management)H-Index: 1
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Kolkata, the capital city of West Bengal, exploits groundwater for public water-supply. The groundwater has been reported to be widely polluted by arsenic (As). Analysis for As in 280 groundwaters from across Kolkata, failed to detect As concentrations >10 μg/L from natural processes. Arsenic concentrations between 10 and 79 μg/L found in 14 of the 280 groundwaters are remnant from a pollution-plume emanating from a single factory site where Paris Green, an arsenical pesticide, was manufactured ...
1 CitationsSource
The faunas of the highly fossiliferous Pirabas Formation belong to the southern part of the biogeographical unit known as "Neogene Tropical America". This unit developed prior to the closure of the Central American Seaway by the Isthmus of Panama. Until now, the age of the Pirabas Formation was inferred only from biostratigraphy. The Sr-isotope (87 Sr/86 Sr) values of pectinid shells from the Pirabas Formation show that most parts of this unit were deposited during the Late Burdigalian (about 16...