Isotope geochemistry of fluid inclusions in Permian halite with implications for the isotopic history of ocean water and the origin of saline formation waters

Knauth, L. Paul; Beeunas, Mark A.

doi:10.1016/0016-7037(86)90195-x

Cited by 239 publications

(114 citation statements)

References 32 publications

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“…For this high-temperature model, the oxygen isotopic values obtained for the chlorite-forming fluid are markedly positive (Figure 6), and consistent with an assumed composition of Paleozoic seawater that had evaporated partially (Knauth and Beeunas, 1986). However, most hydrogen-isotope values calculated for the fluid (-55 to +5%o) are more negative than expected for such an origin (-10 to +10%o), even for brines that were more highly evaporated (Figure 6).…”

Section: Chlorite Formationsupporting

confidence: 71%

“…The 8D and B180 values of fluids responsible for secondary clay formation, calculated at 150~ for chlorite and 40~ for illite using Equations (1) to (4) (see text). The trajectories for evaporation of modern and Paleozoic seawater are modified from Holser (1979) and Knauth and Beeunas (1986). The ends of these curves (arrow) correspond to halite saturation.…”

Section: Chlorite Formationmentioning

confidence: 99%

“…The ends of these curves (arrow) correspond to halite saturation. The solid diamond is the estimate from Knauth and Beeunas (1986) for Paleozoic seawater. Inset: the stable isotopic compositions of fluids responsible for secondary illite formation, as modified by calculation for core #159 at a temperature of 50~…”

Section: Chlorite Formationmentioning

confidence: 99%

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Multiple Episodes of Clay Alteration at the Precambrian/Paleozoic Unconformity, Appalachian Basin: Isotopic Evidence for Long-Distance and Local Fluid Migrations

Ziegler

Longstaffe

2000

Clays and clay miner.

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Abstract--Chlorite and illite are commonly associated with ubiquitous secondary K-rich feldspar in the rocks located immediately above and below the Precambrian-Paleozoic unconformity in southwestern Ontario, and elsewhere in the mid-continent of North America. This alteration assemblage is attributed to long-distance migration of hot brines driven westward by orogenic processes originating along the eastern seaboard of North America. The ~D and 8180 values of chlorite and illite, plus K-Ar dates for secondary K-rich feldspar and illite, were used to determine the nature, origin, and timing of the fluids that altered Precambrian granites and their overlying rocks in southwestern Ontario. The ~80 values of the chlorite-forming fluids are best explained by initial hot brines (~ 150~ evolved mostly from seawater. Secondary K-rich feldspar formation followed shortly thereafter, as the fluids cooled and perhaps mixed with meteoric water. Regional migration of the brines was induced by Taconic orogenic events to the east. The hydrogen and oxygen isotopic compositions for the secondary illite of the early to mid-Carboniferous indicate its crystallization from local meteoric water at low temperatures (40-55~ Infiltration of local meteoric water into the Paleozoic and uppermost altered Precambrian rocks occurred during uplift, erosion, and subaerial exposure of local arches in southern Ontario. The local basement reactivation and associated secondary illite formation in this portion of the North American hinterland was likely a distal expression of east-coast Acadian and Alleghanian orogenic activity.

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Section: Chlorite Formationsupporting

confidence: 71%

Section: Chlorite Formationmentioning

confidence: 99%

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Multiple Episodes of Clay Alteration at the Precambrian/Paleozoic Unconformity, Appalachian Basin: Isotopic Evidence for Long-Distance and Local Fluid Migrations

Ziegler

Longstaffe

2000

Clays and clay miner.

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“…Thus, the low D signature could be merely a product of evaporation past halite 832 precipitation (cf. Knauth and Beeunas, 1985). …”

mentioning

confidence: 99%

A Review of Fluid Inclusion Constraints on Mineralization in the Irish Ore Field and Implications for the Genesis of Sediment-Hosted Zn-Pb Deposits

Wilkinson¹

2010

Economic Geology

106

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higher salinity than is typical of the Waulsortian-hosted deposits further south (Tynagh, Silvermines, 22Lisheen and Galmoy). Subeconomic prospects tend to display a narrower range in salinity, mostly at 23 the lower end of the range observed in the ore deposits. In some prospects, and on the margins of 24 some ore deposits, evidence for dilution is observed, interpreted to reflect mixing between 25 hydrothermal fluids and unmodified seawater. This process is inferred to be unfavorable for 26 mineralization. 27Homogenization temperatures, a reasonable proxy for true trapping temperatures in the orefield, 61The coincidence of structurally-controlled, high temperature reaction zones, brine-producing 62 footwalls, and hangingwall traps, with bacterial blooms above upwelling plumes of hydrothermal 63 fluids, can be interpreted as a self-organizing system that locally converged on ore-forming 64 conditions. Understanding the first-order structural control of the ore systems will therefore be 65 critical for predicting new deposits. 66The Irish orefield presents arguably the best database available on the thermal and chemical

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“…The D/H ratio of water in fluid inclusions in halite was first reported by Holser et al (1963). Knauth and Beeunas (1986) carried out an extensive isotopic study on brine inclusions in Permian halites. However, their result has serious problems.…”

Section: Introductionmentioning

confidence: 99%

Extraction and isotopic analysis of fluid inclusions in halites.

Horita

Matsuo

1986

Geochem. J.

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Basic techniquefor the extraction and isotopic analysis of fluid inclusions in halite was investigated using synthetic single crystals of halite and three natural halite samples from China.Vacuum ball-mill, vacuum decrepitation and vacuum melting methods were examined for the extraction of fluid inclusions.Results of analyses on SD and 6'x0 of the water in fluid inclusions extracted by the ball-mill method from synthetic single crystals agreed with those of the mother solution from which the single crystals were formed. Although the 8'80 value of the water extracted by the melting method agrees well with that of the mother solution, the bD value was about 7 % more negative than that of the mother solution .There was a great difference in both SD and S'50 of the water extracted by the two methods applied to the identical natural halite samples; the melting method gave consistently more negative values for both SD and b'x0 compared with those by the ball-mill method.

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Isotope geochemistry of fluid inclusions in Permian halite with implications for the isotopic history of ocean water and the origin of saline formation waters

Cited by 239 publications

References 32 publications

Multiple Episodes of Clay Alteration at the Precambrian/Paleozoic Unconformity, Appalachian Basin: Isotopic Evidence for Long-Distance and Local Fluid Migrations

Multiple Episodes of Clay Alteration at the Precambrian/Paleozoic Unconformity, Appalachian Basin: Isotopic Evidence for Long-Distance and Local Fluid Migrations

A Review of Fluid Inclusion Constraints on Mineralization in the Irish Ore Field and Implications for the Genesis of Sediment-Hosted Zn-Pb Deposits

Extraction and isotopic analysis of fluid inclusions in halites.

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