Secular variation in seawater chemistry and the origin of calcium chloride basinal brines
作者： Tim K. Lowenstein , Lawrence A. Hardie , Michael N. Timofeeff , Robert V. Demicco
DOI: 10.1130/G19728R.1
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摘要: CaCl 2 basinal brines, which are present in most Phanerozoic sedimentary basins, inherited their chemistries and salinities from evaporated paleoseawaters when the world oceans were Ca rich SO 4 poor (CaCl seas). seas coincided with periods of rapid seafloor spreading, high influxes mid-ocean-ridge brines , elevated sea levels, conditions that favored accumulation marine marginal interior continental basins. Typical Silurian-Devonian formations Illinois basin, United States, show same compositional trends as those progressively -rich Silurian seawater. Chemical deviations can be accounted for quantitatively by brine-rock reactions during burial (dolomitization, dolomite K-feldspar cement). This explanation origin contrasts others assume constancy seawater chemistry involve more complex interactions.
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