Recognition of a Cretaceous outlier in northwestern Ontario

1990 ◽  
Vol 27 (2) ◽  
pp. 306-311 ◽  
Author(s):  
Pierre A. Zippi ◽  
Andrew F. Bajc
Keyword(s):  
Heavy Mineral ◽  
Quaternary Sediments ◽  
Northwestern Ontario ◽  
Clastic Sediments ◽  
Angiosperm Pollen ◽  
Mineral Analyses

Borehole F-88-33, located near Rainy River, Ontario, intersected Cretaceous nonmarine clastic sediments. This is the first documented occurrence in Ontario of Cretaceous sediments associated with the western interior. Lithologie and heavy-mineral analyses were used to differentiate this unit from the overlying Quaternary sediments. Seventy-five species of fossil angiosperm pollen, gymnosperm pollen, spores, megaspores, and algal cysts were recovered from borehole F-88-33 and used to date the pre-Quaternary sediments as late Albian to early Cenomanian. The occurrence of these nonmarine sediments in northwestern Ontario helps to better define the limits of Cretaceous sedimentation in the western interior.

scholarly journals Hazardous radioactivity levels and heavy mineral concentrations in beach sediments of Lake Peipsi, northeastern Estonia

Geologos ◽  
2018 ◽  
Vol 24 (1) ◽  
pp. 1-12
Author(s):  
Johanna-Iisebel Järvelill ◽  
Rein Koch ◽  
Anto Raukas ◽  
Tiit Vaasma
Keyword(s):  
Mineral Content ◽  
Heavy Mineral ◽  
Western Coast ◽  
Northern Coast ◽  
Quaternary Sediments ◽  
Lake Peipsi ◽  
Beach Sediments ◽  
Mineral Concentrations ◽  
Mineral Analyses ◽  
Radioactivity Levels

Abstract The present study discusses results of heavy mineral analyses and radioactivity of beach sediments of Lake Peipsi. Such analyses are commonly done globally, but had not yet been conducted for the fourth largest lake in Europe. The average heavy mineral content in Lake Peipsi beach sediments along the northern and western coast is higher than usual for Estonian coastal and Quaternary sediments. Concomitantly, elevated radioactivity levels have been measured in several places, with the highest concentrations observed at Alajõe (1885.5 Bq/kg), which is over five times more than the recommended limit. The aim of the present study is to find sites with higher radioactivity levels, because the northern coast of Lake Peipsi is a well-known recreational area.

scholarly journals Heavy-mineral derived provenance study of Quaternary sediments of the Mazovian Lowland, Central Poland

Baltica ◽  
2017 ◽  
Vol 30 (1) ◽  
pp. 1-14
Author(s):  
Edyta Kalińska-Nartiša ◽  
Māris Nartišs
Keyword(s):  
Time Frame ◽  
Heavy Minerals ◽  
Provenance Study ◽  
Quaternary Sediments ◽  
Aeolian Process ◽  
Source Areas ◽  
Central Poland ◽  
Clastic Sediments ◽  
Aeolian Sediments ◽  
Geological Conditions

This study makes an attempt to characterise Quaternary sediments in terms of their heavy minerals (HM) composition. Authors focus on the Mazovian Lowland, Central Poland, where a number of clastic sediments of different age and origin overlap. Five sedimentary settings, covering the Saalian-Holocene (MIS 1-6) time frame, have been studied to reveal whether these sediments have single or multiple source areas and to decipher sediment transformations. In the glacial setting either garnet- or amphibole-dominated sediments occur. This unequivocal mineral combination likely reflects a multi-sourcing resulting from multi-directional ice advance. The HM taken from fan-like forms and aeolian sediments are closely related; these sediments are largely multicyclic and likely derived from pre-existing recycling sediments. Similar mineral suite is also typical for long-lasting aeolian processes and is observed in dune sediments. Ultrastable components are less frequent in the coversand, which points at a shorter-lived aeolian process. Finally, the fluvial setting reveals multi-sourcing largely depending on local geological conditions.

An Upper Eocene Outlier at St. Ann's Hill, Chertsey

1950 ◽  
Vol 87 (4) ◽  
pp. 279-284
Author(s):  
H. G. Midgley
Keyword(s):  
Heavy Mineral ◽  
Upper Eocene ◽  
Pebble Bed ◽  
Indicator Minerals ◽  
Mineral Analyses

AbstractAn outlier of the Bagshot Series occurs at St. Ann' Hill, Chertsey, where beds of the Bagshot, Bracklesham, and Barton sub-divisions are exposed. The division into these beds by pebble bed junctions is suggested. Heavy mineral analyses using percentages of fresh and abraded grains of three indicator minerals, viz. tourmaline, rutile, and zircon, suggests that the divisions postulated are justified.

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