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A new analytical method for the determination of elemental sulfur using gas chromatography-mass spectrometry (GC-MS) was developed. Elemental sulfur, S 0 , was extracted from a fresh sediment sample with the aid of CCl 4 . One microliter of CCl 4 extract was directly injected into and analyzed by GC-MS. In comparison with the few existing methods for S 0 determination,...
We report SHRIMP U-Pb ages of 49 zircons from a sand sample from the lower Orinoco River, Venezuela, and Nd model ages of the fine sediment load from the main river and tributaries. The U-Pb ages reflect individual magmatic or metamorphic events, the Sm-Nd model ages reflect average crustal-residence ages of the sediment sources. Together they allow delineation of the crust-formation history of...
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