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Titolo:
SALINE GROUNDWATERS AND BRINES IN THE CANADIAN SHIELD - GEOCHEMICAL AND ISOTOPIC EVIDENCE FOR A RESIDUAL EVAPORITE BRINE COMPONENT
Autore:
BOTTOMLEY DJ; GREGOIRE DC; RAVEN KG;
Indirizzi:
ATOM ENERGY CONTROL BOARD,DIV WASTES & IMPACTS,280 SLATER ST OTTAWA K1P 5S9 ON CANADA GEOL SURVEY CANADA OTTAWA K1A 0E8 ONTARIO CANADA RAVEN BECK ENVIRONM LTD OTTAWA K1S 2E1 ON CANADA
Titolo Testata:
Geochimica et cosmochimica acta
fascicolo: 5, volume: 58, anno: 1994,
pagine: 1483 - 1498
SICI:
0016-7037(1994)58:5<1483:SGABIT>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLASMA MASS-SPECTROMETRY; FORMATION WATERS; PRECAMBRIAN SHIELD; CONTINENTAL-CRUST; SEDIMENTARY BASIN; SUPERIOR PROVINCE; FLUID INCLUSIONS; BORON; CHEMISTRY; EVOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
61
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Bottomley et al., "SALINE GROUNDWATERS AND BRINES IN THE CANADIAN SHIELD - GEOCHEMICAL AND ISOTOPIC EVIDENCE FOR A RESIDUAL EVAPORITE BRINE COMPONENT", Geochimica et cosmochimica acta, 58(5), 1994, pp. 1483-1498

Abstract

Saline Ca-Na/Cl type groundwaters and brines sampled in deep mines over an extensive area of the Canadian Precambrian Shield have elevated Br/Cl ratios which may indicate that the chlorinity of these waters was derived from the infiltration of residual evaporitic brines, remnants of the great marine incursions of the Paleozoic era. Boron concentrations in these waters are generally low (i.e.. < approximately 2 mg/L)relative to seawater or Alberta Basin Devonian formation waters. However, the B-11/B-10 ratios of these waters are significantly greater than the average value for continental crustal rocks with the highest values (approximately 4.19) approaching that of present-day seawater (4.20). Moreover, the boron isotopic ratios generally trend to higher values with increasing chlorinity which supports the conclusion from the Br-Cl relationship that most of the chloride in shield brines is of marine origin, rather than a product of water/rock interactions. If thisis correct, crystalline rocks must then be sufficiently permeable on a regional scale to have allowed the brine to infiltrate to depths of several kilometers where it now resides.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 19:21:29