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Titolo:
Brines in the Carboniferous Sydney Coalfield, Atlantic Canada
Autore:
Martel, AT; Gibling, MR; Nguyen, M;
Indirizzi:
Dalhousie Univ, Dept Earth Sci, Halifax, NS B3H 3J5, Canada Dalhousie Univ Halifax NS Canada B3H 3J5 Sci, Halifax, NS B3H 3J5, Canada
Titolo Testata:
APPLIED GEOCHEMISTRY
fascicolo: 1, volume: 16, anno: 2001,
pagine: 35 - 55
SICI:
0883-2927(200101)16:1<35:BITCSC>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SALINE FORMATION WATERS; ZN-PB DEPOSIT; SOUTH-CENTRAL TEXAS; CAPE-BRETON ISLAND; NOVA-SCOTIA; ISOTOPIC COMPOSITION; SEDIMENTARY BASIN; MINERALIZING BRINES; EASTERN CANADA; PARIS BASIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
98
Recensione:
Indirizzi per estratti:
Indirizzo: Gibling, MR Dalhousie Univ, Dept Earth Sci, Halifax, NS B3H 3J5, Canada Dalhousie Univ Halifax NS Canada B3H 3J5 , NS B3H 3J5, Canada
Citazione:
A.T. Martel et al., "Brines in the Carboniferous Sydney Coalfield, Atlantic Canada", APPL GEOCH, 16(1), 2001, pp. 35-55

Abstract

Formation waters within Upper Carboniferous sandstones in the sub-sea Prince and Phalen coal mines, Nova Scotia, originated as residual evaporative fluids, probably during the precipitation of Windsor Group (Lower Carboniferous) salts which underlie the coal measures. Salinity varies from 7800 to 176,000 mg/l: and the waters are Na-Ca-Cl brines enriched in Ca. Sr and Br and depleted in Na, K, Mg and SO4 relative to the seawater evaporation curve. Br:CI and Na:Cl ratios suggest that the brine composition corresponds to an evaporation ratio of as much as 30, The brines lie close to the meteoricline on H/O isotopic plots but with a compositional range of delta O-18 from -4.18 to -6.99 and of deltaD from -42.4 to -23.5, distant from modern meteoric or ocean water. Mine water composition contrasts with that of nearbysalt-spring brines, which are inferred to have originated through dissolution of Windsor Group evaporites by modern meteoric waters. However, a contribution to the mine waters from halite dissolution and from Br in organic matter cannot be ruled out. Present concentrations of several elements in the brines can be explained by water-rock interaction. The original Windsor brines probably moved up into the overlying coal-measure sandstones along faults, prior to the Late Triassic. The high salinity and irregular salinity distribution in the Phalen sandstones suggests that the brines have undergone only modest dilution and are virtually immobile. In contrast, Prince waters show a progressive increase in salinity with depth and are inferred to have mixed with surface waters. Basinal brines from which these modern formation fluids were derived may have been important agents in base-metal and Ba mineralisation from the mid-Carboniferous onwards, as saline fluid inclusions are common in Zn-Pb sulphide deposits in the region. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 16:01:47