Proterozoic intracontinental basin: The Vindhyan example
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چکیده
منابع مشابه
Trace element and Nd-isotopic evidence for sediment sources in the mid-Proterozoic Vindhyan Basin, central India
Ancient sediments reflect the compositions of old eroded continental crustal material and preserve geochemical signatures of paleo-tectonic and volcanic events. Geochemical study of such sediments provides insight into tectonic events that shaped the face of the Earth. Nd isotopes are best suited for such studies because rare earth elements (REE), specifically Sm and Nd are not fractionated dur...
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Previous geochemical and biomarker studies of the late Paleo-Mesoproterozoic propose a stratified world, with strongly reducing (possibly sulfidic) deep-ocean conditions overlain by an oxygenated surface-ocean and atmosphere. To investigate such a scenario, we look to the structure of the biogeochemical sulfur cycle. We present sulfur (S, S, S, and S in sulfides) isotope data from the McArthur ...
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McMenamin, D.S., Kumar, S. and Awramik, S.M., 1983. Microbial fossils from the Kheinjua Format ion, Middle Proterozoic Semri Group (Lower Vindhyan), Son Valley area, central India. Precambrian Res., 21: 247--271. Abundant coccoid and filamentous microfosslls are found in petrographic thin sections of stratiform stromatoli t ic cherts from the z1200 Ma-old Fawn Limestone of the Kheinjua Format i...
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Figure 1. A: Map of Charleston-Nebo salient and northernmost Book Cliffs showing rock units, thrust faults (dashed where buried), key seismic coverage (gray lines), measured stratigraphic sections (1–7; 8 is location of additional Blackhawk sandstone samples), and wells. Rock units: KTs—Cretaceous–Tertiary strata (North Horn and younger formations), Kmv—Cretaceous Mesaverde Group (Blackhawk, Ca...
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Environmental policy discussions in the United States have been characterized by a constant tug-ofwar among an “unholy alliance of ignorance, ideology, and self-interest” since the early 1970s (see Blinder (1987) and Rolston (2000) for representative discussions of the roles scientists have played). Scientists are challenged in this tug-of-war when asked to interpret the social and biophysical ...
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ژورنال
عنوان ژورنال: Journal of Earth System Science
سال: 2006
ISSN: 0253-4126,0973-774X
DOI: 10.1007/bf02703022