Geologic control on soil composition and properties, Lake Ojibway clay plain, Matagami, Quebec

Varved clays deposited in proglacial Lake Ojibway at Matagami, Quebec, were derived from two source areas: carbonate-deficient, Precambrian crystalline igneous rocks from New Quebec to the east and carbonate-rich Palaeozoic rocks from the James Bay lowlands in Ontario to the west. About 50% of the 12–15 m thick clay section consists of varved clays containing less than 3% carbonate, reflecting the New Quebec source. The remaining 50% of the section consists of two pulses of carbonate-enriched varves (15–30% carbonate) derived from rock flour in two glacial advances known as Cochrane I and Cochrane II, which advanced to within 20 km of Matagami.The clays are preconsolidated at the site by a combination of desiccation, groundwater level drawdown, and bonding, in such a way that σp′ is almost constant at 70 kPa at depths from 3.5 to 10 m.High in situ water contents correlate with thinner, low-carbonate, distal varves of high activity. The est correlations are obtained for relative activity, Ac(rel), defined as plasticity index ÷ specific surface area (Ip ÷ SS). Carbonate seems to have effectively neutralized smectite in the Cochrane proximal varves, rendering the distal varves (of New Quebec source) the most active clays at the site. Key words: varved clay, activity, carbonate, turbidity currents, glacial geology.

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Soil composition and properties: a case study of Shilovsky Upland Oak Forest (Russia)

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/226/1/012015 ◽

2019 ◽

Vol 226 ◽

pp. 012015

Author(s):

T Deviatova ◽

L Alaeva ◽

L Jablonskikh

Keyword(s):

Oak Forest ◽

Soil Composition ◽

Soil Composition And Properties

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Elemental analysis of medicinal plants from different sites by instrumental neutron activation analysis

International Journal of Bioassays ◽

10.21746/ijbio.2016.03.0010 ◽

2016 ◽

Vol 5 (03) ◽

pp. 4892 ◽

Cited By ~ 2

Author(s):

Ratna Raju M.* ◽

Madhusudhana Rao P. V. ◽

Seshi Reddy T. ◽

Raju M. K. ◽

Brahmaji Rao J. S. ◽

...

Keyword(s):

Neutron Activation Analysis ◽

Instrumental Neutron Activation Analysis ◽

Activation Analysis ◽

Medicinal Plants ◽

Neutron Activation ◽

Gamma Ray ◽

Elemental Content ◽

Soil Composition ◽

Gamma Ray Spectrometer ◽

Instrumental Neutron Activation

A study was undertaken to evaluate the inorganic elements for humans in two Indian medicinal plants leaves, namely Sphaeranthus indicus, and Cassia fistula by Instrumental Neutron Activation Analysis (INAA). INAA experiment was performed by using 20 kW KAMINI Reactor at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam. The emitted gamma rays were measured using gamma ray spectrometer. The concentrations of Al, Br, Ca, Fe, K, La, Mg, Mn, Na, Sc, V and Zn were determined in the selected medicinal plants. The medicinal leaves are using in treatment of various important ailments. The elemental content in selected medicinal leaves is various proportions depending on the soil composition, location of plant specimen and the climate in which the plant grows.

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Detection of oasis soil composition and analysis of environmental parameters based on hyperspectral image and GIS

Arabian Journal of Geosciences ◽

10.1007/s12517-021-07407-6 ◽

2021 ◽

Vol 14 (11) ◽

Author(s):

Yingfeng Chen ◽

Zhongyong Xiao ◽

Guoqiang Chen ◽

Weimin Su ◽

Jiongfeng Chen

Keyword(s):

Hyperspectral Image ◽

Environmental Parameters ◽

Soil Composition

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Validation of the soil dielectric spectroscopic models with input parameters based on soil composition

2007 IEEE International Geoscience and Remote Sensing Symposium ◽

10.1109/igarss.2007.4422905 ◽

2007 ◽

Author(s):

V.L. Mironov ◽

L.G. Kosolapova ◽

S.V. Fomin

Keyword(s):

Soil Composition ◽

Input Parameters

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Cosmogenic10Be dating of raised shorelines constrains the timing of lake levels in the eastern Lake Agassiz-Ojibway basin

Quaternary Research ◽

10.1017/qua.2017.40 ◽

2017 ◽

Vol 88 (2) ◽

pp. 265-276 ◽

Cited By ~ 7

Author(s):

Pierre-Marc Godbout ◽

Martin Roy ◽

Jean J. Veillette ◽

Joerg M. Schaefer

Keyword(s):

Lake Level ◽

Time Interval ◽

Lake Levels ◽

Lake Agassiz ◽

Cosmogenic Isotopes ◽

Exposure Dating ◽

Group 3 ◽

Lake Stage ◽

Lake Ojibway

AbstractSurface exposure dating was applied to erosional shorelines associated with the Angliers lake level that marks an important stage of Lake Ojibway. The distribution of 1510Be ages from five sites shows a main group (10 samples) of coherent10Be ages yielding a mean age of 9.9±0.7 ka that assigns the development of this lake level to the early part of the Lake Ojibway history. A smaller group (3 samples) is part of a more scattered distribution of older10Be ages (with 2 outliers) that points to an inheritance of cosmogenic isotopes from a previous exposure, revealing an apparent mean age of 15.8±0.9 ka that is incompatible with the Ojibway inundation and the regional deglaciation. Our results provide the first direct10Be chronology on the sequence of lake levels in the Ojibway basin, which includes the lake stage presumably associated with the confluence and subsequent drainage of Lakes Agassiz and Ojibway. This study demonstrates the potential of this approach to date glacial lake shorelines and underlies the importance of obtaining additional chronological constraints on the Agassiz-Ojibway shoreline sequence to confidently assign a particular lake stage and/or lake-level drawdown to a specific time interval of the deglaciation.

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THE INFLUENCE OF METHODS AND TECHNIQUES OF THE MAIN PROCESSING OF ORDINARY CHERNOZEM ON THE HUMIDITY, DENSITY OF SOIL COMPOSITION AND YIELD OF OILSEED FLAX IN THE CENTRAL ZONE OF THE KRASNODAR TERRITORY

Agro-industrial technologies of the Central Russia ◽

10.24888/2541-7835-2021-20-67-73 ◽

2021 ◽

Vol 2 (21) ◽

pp. 67-73

Author(s):

S.N. Osaulenko ◽

◽

V.S. Polous ◽

Keyword(s):

Soil Moisture ◽

Central Zone ◽

Ordinary Chernozem ◽

Net Income ◽

Zero Tillage ◽

Soil Composition ◽

Average Yield ◽

Methods And Techniques ◽

Optimal Values ◽

Complex Influence

The aim of the research was to study the complex influence of methods and techniques of the main processing of ordinary chernozem, its agrophysical indicators on the yield of oilseed flax. It was found that surface (6-8 cm) and zero tillage did not significantly affect the dynamics of soil moisture in comparison with plowing at 22-24 cm (control). In the spring of productive moisture in the layer of 0-100 cm accumulated 151,5-150-152, mm, respectively. During the growing sea-son of the crop, its number decreased to 60 mm. The density of soil addition on plots without me-chanical treatment before sowing oilseed flax in a layer of 0-10 cm was 1.03 g / cm3, which was 0.01 g/cm3 higher than the variant with surface treatment and 0.04 g/cm3 higher than the control. In the horizon of 20-30 cm, the indicators increased to 1.15 g / cm3 for plowing and 1.23 g/cm3 for zero processing. Before harvesting flax in this horizon, the density of the soil composition cor-responded to the values of 1.27-1.30 g / cm3 and did not significantly exceed the optimal values. Optimal agrophysical values of the soil, as well as the use of fertilizers, pesticides and growth stimulators, provided an average yield of oilseed flax in 2014-2016: 1.75 t/ha at surface and 1.70 t/ha at zero tillage. In relation to the control, this was less by 3% and 6%, respectively. For ener-gy-saving treatments, the conditional net income was 18.3 thousand rubles/ha, and the profitabil-ity was 70%.

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