Charlevoix County, Quebeci
نویسنده
چکیده
Introd,uction During the 1955 field season the writer was engaged in mapping radioactive deposits in the Province of Quebec for the Quebec Department of Mines. Several hand specimens collected in the vicinity of St.Sim€oq' Charlevoix County, were found to show up to 20X normal radioactive background. The source of the radioactivity appeared to be a yellov/ translucent mineral present in small grains, which was subsequently identified by an r-ray powder photograph to be xenotime. spectrographic analysis ofa sample of the pure mineral showed that it contained apprlciable quantities of both thorium and uranium and further work was carried out to establish its composition and physical properties. Xenotime is probably not an uncommon accessory constituent of Precambrian rocks in Canada but in view of the sparse literature concerning this mineral, especially for this country, it seemed worthwhile putting on record the properties of the specimen. The assistance of grants for geochemical research and development of spectrochemical melhods from the Geological Survey of Canada and from the National Research council is gratefully acknowled$ed.
منابع مشابه
SACS gene-related autosomal recessive spastic ataxia of Charlevoix-Saguenay from South India
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) is a neurodegenerative disorder characterized by late infantile onset spastic ataxia and other neurological features. Initially described in the Charlevoix-Saguenay region of Quebec, Canada, it is being increasingly reported from many other countries. Here, we present the case of a 20-year-old male from South India, who presente...
متن کاملNovel compound heterozygous mutation in SACS gene leads to a milder autosomal recessive spastic ataxia of Charlevoix‐Saguenay, ARSACS, in a Finnish family
Autosomal recessive spastic ataxia of Charlevoix-Saguenay is a rare disorder outside Quebec causing childhood-onset cerebellar ataxia, peripheral neuropathy, and pyramidal tract signs. A Finnish family with milder form of ARSACS was found to harbor three mutations, p.E1100K, p.N1489S, and p.M1359T, in SACS gene. The mutations segregated with the disease.
متن کاملA Probable Korean Case of Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay.
Autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) has been identified in diverse countries. However, outside of North America, North Africa, and Europe, ARSACS was recognized only in the Japanese population. Moreover, through genetic research, the disease is thought to exhibit no founder effect, except in the Quebec descent. Therefore, it is possible that ARSACS might be undere...
متن کاملAutosomal recessive spastic ataxia of Charlevoix-Saguenay: a report of MR imaging in 5 patients.
We present findings on MR imaging in 5 patients with autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS). In the literature, early atrophy of the superior vermis as well as progressive atrophy of the cerebellar hemispheres and cervical cord was described. We found linear hypointensity on T2 and T2 fluid-attenuated inversion recovery-weighted images in the pons in all of our 5 pat...
متن کاملNovel SACS Mutations Identified by Whole Exome Sequencing in a Norwegian Family with Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay
We employed whole exome sequencing to investigate three Norwegian siblings with an autosomal recessive spastic ataxia and epilepsy. All patients were compound heterozygous (c.13352T>C, p.Leu4451Pro; c.6890T>G, p.Leu2297Trp) for mutations in the SACS gene establishing the diagnosis of autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS). The clinical features shown by our patients ...
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تاریخ انتشار 2006