Anhydrite in Kuroko DepositsMode of Occurrence and Depositional Mechanisms

1983 ◽  
Author(s):  
Naotatsu Shikazono ◽  
Heinrich D. Holland ◽  
Robert F. Quirk
Keyword(s):  
Mode Of Occurrence ◽  
Kuroko Deposits

Preliminary report on the International Energy Agency mode of occurrence inter-laboratory comparison; Phase I, USGS results

1999 ◽  
Author(s):  
Curtis A. Palmer ◽  
Allan Kolker ◽  
Jason C. Willett ◽  
Stanley J. Mroczkowski ◽  
Robert B. Finkelman ◽  
...  
Keyword(s):  
Phase I ◽  
Preliminary Report ◽  
International Energy Agency ◽  
Energy Agency ◽  
Mode Of Occurrence

scholarly journals Distribution and Mode of Occurrence of Co, Ni, Cu, Zn, As, Ag, Cd, Sb, Pb in the Feed Coal, Fly Ash, Slag, in the Topsoil and in the Roots of Trees and Undergrowth Downwind of Three Power Stations in Poland

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 133
Author(s):  
Henryk R. Parzentny ◽  
Leokadia Róg
Keyword(s):  
Inductively Coupled Plasma ◽  
Coal Fly Ash ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Plasma Atomic Emission Spectrometry ◽  
X Ray ◽  
Inductively Coupled ◽  
Power Stations ◽  
Mode Of Occurrence ◽  
Feed Coal

It is supposed that the determination of the content and the mode of occurrence of ecotoxic elements (EE) in feed coal play the most significant role in forecasting distribution of EE in the soil and plants in the vicinity of power stations. Hence, the aim of the work was to analyze the properties of the feed coal, the combustion residues, and the topsoil which are reached by EE together with dust from power stations. The mineral and organic phases, which are the main hosts of EE, were identified by microscopy, X-ray powder diffraction, inductively coupled plasma atomic emission spectrometry, and scanning electron microscope with an energy dispersive X-ray methods. The highest content of elements was observed in the Oi and Oe subhorizons of the topsoil. Their hosts are various types of microspheres and char, emitted by power stations. In the areas of long-term industrial activity, there are also sharp-edged grains of magnetite emitted in the past by zinc, lead, and ironworks. The enrichment of the topsoil with these elements resulted in the increase in the content of EE, by between 0.2 times for Co; and 41.0 times for Cd in the roots of Scots pine, common oak and undergrowth, especially in the rhizodermis and the primary cortex and, more seldom, in the axle roller and cortex cells.

scholarly journals 2. On the mode of occurrence of Gypsum in Nova Scotia, and on its probable origin.

1851 ◽  
Vol 2 ◽  
pp. 141-142
Author(s):  
J. W. Dawson
Keyword(s):  
Nova Scotia ◽  
General Description ◽  
Regular Arrangement ◽  
Mode Of Occurrence ◽  
Probable Origin

In this paper, the author, after a general description of the geological character of the country, describes the superficial deposits which he divides into—1.The unstratified drift or boulder formation. This, the lower of the two superficial deposits, is characterised by the circumstance, that most of the materials have been derived from the rocks on which they now rest, or those in the vicinity. The fragments are angular, and altogether devoid of any regular arrangement. This unstratified drift, however, does contain boulders from distant localities, which may generally be traced. The appearances indicate that the materials have been transported from the northward, and also, to a less extent, from the southward, and, indeed, in various directions.

Mineralogy and geochemistry of an Archean tuffaceous exhalite: the Main Contact Tuff, Millenbach mine area, Noranda, Quebec

1989 ◽  
Vol 26 (1) ◽  
pp. 88-105 ◽  
Author(s):  
Stavros I. Kalogeropoulos ◽  
Steven D. Scott
Keyword(s):  
Trace Elements ◽  
Hydrothermal System ◽  
The Other ◽  
Mine Area ◽  
The North ◽  
Metalliferous Sediment ◽  
Multiple Input ◽  
Variable Contribution ◽  
Rock Specimens ◽  
Kuroko Deposits

The Main Contact Tuff, in the vicinity of Millenbach mine, Noranda, Quebec, is an extensive, although discontinuous, ore-related volcanic exhalative metalliferous sediment, or "tuffaceous exhalite," of Archean age. It was formed by the variable contribution of two constituents: (1) exhalite (chemical) composed mainly of pyrite, quartz, sphalerite, pyrrhotite, and chalcopyrite and (2) tuff (clastic) composed of quartz, chlorite, and sericite.Tuffaceous exhalites such as the Main Contact Tuff and the similar tetsusekiei of the Japanese Kuroko deposits (Miocene age) indicate a fossil hydrothermal system that may or may not have produced economic concentrations of metallic sulfides. The Main Contact Tuff displays cryptic variations, which provide exploration guides at different scales: (1) the Fe/[Fe + Mg] ratios of chlorite decrease from 0.63 to 0.32 over a distance of 0.3 km approaching ore from the north, and from 0.72 to 0.32 over 1.5 km from the south; (2) the FeO/[FeO + MgO] (sulfide-free) ratios of whole-rock specimens decrease from about 0.8 to 0.3 approaching the ore; (3) ilmenite is replaced in the ore zone by rutile and (or) sphene; and (4) the most manganiferous ilmenite is found close to ore. On the other hand, trace elements of exhalative origin (e.g., Ag, Co) in the Main Contact Tuff appear not to provide useful vectors towards ore. They are concentrated relative to normal pelagic rocks, but their distributions with respect to ore are complicated by multiple input sources and postexhalative redistributions of elements.

On a new mode of occurrence of ruby in North Carolina

1899 ◽  
Vol s4-8 (47) ◽  
pp. 370-381
Author(s):  
J. W. Judd ◽  
W. E. Hidden
Keyword(s):  
North Carolina ◽  
Mode Of Occurrence

III.—On the Occurrence of Concretionary Masses of Flint and Chert in the Maltese Limestones

1893 ◽  
Vol 10 (4) ◽  
pp. 157-160 ◽  
Author(s):  
John H. Cooke
Keyword(s):  
Restricted Area ◽  
Maltese Islands ◽  
Mode Of Occurrence

The late Admiral Spratt, R.N., and Dr. John Murray, of the “Challenger” Expedition, have, in their brochures on Maltese Geology, made allusion en passant to the occurrence of chert nodules in the Globigerina limestones of the Maltese islands. Neither of these gentlemen, however, gave any details of the nature, mode of occurrence, or distribution of the concretions, an omission which was probably due to the restricted area of the horizon at which the nodules are found, and to the irregular and sparse manner in which thev are distributed.

scholarly journals Assessment of Incident of Road Traffic Accident along Yola Gombe Route

2021 ◽  
Vol 04 (07) ◽  
Author(s):  
Innocent Reuben ◽  
Keyword(s):  
Developing Countries ◽  
Hot Spots ◽  
Road Traffic Accident ◽  
Traffic Accident ◽  
Road Traffic ◽  
Road Accident ◽  
Economic Losses ◽  
Gis And Remote Sensing ◽  
Mode Of Occurrence ◽  
Road Data

Road traffic accident has become a prevalent and re-occurring phenomenon in Nigeria which constitutes a menace in modern times. Although all the developed and developing countries have suffer from various degrees of road accidents the developing countries clearly dominates with Nigeria having the second highest road accident among the 193 ranked countries of the world. This research aimed at identifying and assessing road accident hot spots between 2012 and 2016 along Yola/Gombe road. Data was collected from the accident hot spots using GIS/GPS techniques. The data was used to map out these accident hot spots. It also assessed the nature, mode of occurrence and types of injuries associated with the accidents within the study area. It further assesses the types and condition of the vehicle with the highest involvement in the accident within the study area.. GIS and Remote sensing method were used to analyse and georeference the map by throwing the coordinates of the accident hotspots that were picked and Data was also collected from Federal Road Safety Commission. These were analysed statistically. Result was used in this research. The study shows that between 2012 and 2016 about 2846 accidents were witnessed, 1,027 people died, 9017 people sustained various degrees of injuries and 3,384 vehicles were involved in the accidents. The causes of accident were observed. The preventive measures were suggested. The study recommended the need to seriously view road traffic regulations seeing them as human induced problem that demand an urgent attention. Such action is aimed at preventing untimely deaths, social, and economic losses and impacts on average Nigerians.

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