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Strauss, H. (1993). The sulfur isotopic record of Precambrian sulfates; new data and a critical evaluation of the existing record. Precambrian Research 63(3-4): 225-246. doi: 10.1016/0301-9268(93)90035-Z. |
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Sulfur isotopic compositions of Precambrian sulfates, both new and previously measured, are summarized and critically evaluated in relation to a seawater sulfate sulfur isotope age curve. A fragmentary Archaean record with delta -values near 0per mil suggests a mantle-dominated sulfur signature for seawater in the early history of the earth. Slightly higher delta (super 34) S-values between +10 and +18per mil characterize Palaeoproterozoic seawater, with evidence coming mainly from trace sulfate data. More continuous records for the Meso- and Neoproterozoic indicate a fairly constant average isotopic composition close to +20per mil, followed by a pronounced increase in delta (super 34) S to values around +30per mil at the Precambrian/Cambrian transition. A negative correlation between the delta (super 34) S (sub sulfate) and delta (super 13) C (sub carbonate) curves is indicated at least for the Neoproterozoic. This would suggest the operation of an exogenic cycle comparable to that in the Phanerozoic for at least the past 1000 Ma. |
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Samples & Analytical Methods |
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Keywords
Africa; alkaline earth metals; Archean; Asia; Australasia;, Australia; Bakoye Group; Bitter Springs Formation; C-13/C-12;, Canada; carbon; equations; evolution; Fig Tree Series; geochemical, cycle; geochemistry; Hormuz Formation; Huttenberg Formation; Iran;, isotope ratios; isotopes; Mackenzie Mountains; Mesoproterozoic;, metals; Middle East; Montana; Namibia; Newland Limestone;, oceanography; Precambrian; Proterozoic; Redstone River Formation;, S-34/S-32; sea water; Southern Africa; Sr-87/Sr-86; stable, isotopes; strontium; sulfates; sulfur; United States; upper, Precambrian; Warrawoona Group; West Africa, 02D, Isotope geochemistry |
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Publisher
Elsevier Science
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1000 AE Amsterdam
The Netherlands
(+31) 20 485 3757
(+31) 20 485 3432
nlinfo-f@elsevier.com |
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