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.

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.

Rare metal indicator minerals in bedrock and till at the Strange Lake peralkaline complex, Quebec and Labrador, Canada

2019 ◽  
Vol 56 (8) ◽  
pp. 857-869
Author(s):  
M.B. McClenaghan ◽  
R.C. Paulen ◽  
I.M. Kjarsgaard
Keyword(s):  
Rare Earth ◽  
Specific Gravity ◽  
Rare Earth Element ◽  
Earth Element ◽  
Rare Metal ◽  
Heavy Mineral ◽  
Surficial Sediments ◽  
Heavy Rare Earth ◽  
Heavy Rare Earth Element ◽  
Indicator Minerals

A study of rare metal indicator minerals and glacial dispersal was carried out at the Strange Lake Zr – Y – heavy rare earth element deposit in northern Quebec and Labrador, Canada. The heavy mineral (>3.2 specific gravity) and mid-density (3.0–3.2 specific gravity) nonferromagnetic fractions of mineralized bedrock from the deposit and till up to 50 km down ice of the deposit were examined to determine the potential of using rare earth element and high fileld strength element indicator minerals for exploration. The deposit contains oxide, silicate, phosphate, and carbonate indicator minerals, some of which (cerianite, uraninite, fluorapatite, rhabdophane, thorianite, danburite, and aeschynite) have not been reported in previous bedrock studies of Strange Lake. Indicator minerals that could be useful in the exploration for similar deposits include Zr silicates (zircon, secondary gittinsite (CaZrSi2O7), and other hydrated Zr±Y±Ca silicates), pyrochlore ((Na,Ca)2Nb2O6(OH,F)), and thorite (Th(SiO4))/thorianite (ThO2) as well as rare earth element minerals monazite ((La,Ce,Y,Th)PO4), chevkinite ((Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22), parisite (Ca(Ce,La)2(CO3)3F2), bastnaesite (Ce(CO3)F), kainosite (Ca2(Y,Ce)2Si4O12(CO3)·H2O), and allanite ((Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH)). Rare metal indicator minerals can be added to the expanding list of indicator minerals that can be recovered from surficial sediments and used to explore for a broad range of deposit types and commodities that already include diamonds and precious, base, and strategic metals.

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.

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