کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6441445 | 1639082 | 2015 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
U-Th isotope constraints on gas hydrate and pockmark dynamics at the Niger delta margin
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
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چکیده انگلیسی
We hypothesize that the period of carbonate formation between 13 and 2.5Â ka was related to an upward migration of gas-hydrate reservoirs to the near seafloor environment. After this pulse of enhanced fluid flow, the diminution of methane fluxes at the base of the local gas-hydrate occurrence zone would have led to hydrate dissolution in sub-surface sediments and pockmark formation, thereby explaining the progressive increase in sedimentation rates, the absence of recent carbonate concretions and the deepening of the sulphate-methane transition zone at site N2-KS-44 inferred from pore water data. Overall, these results provide further constraints about the relationship between gas hydrate dynamics and the evolution of pockmarks at ocean margins through time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 370, 1 December 2015, Pages 87-98
Journal: Marine Geology - Volume 370, 1 December 2015, Pages 87-98
نویسندگان
Germain Bayon, Gideon M. Henderson, Joël Etoubleau, Jean-Claude Caprais, Livio Ruffine, Tania Marsset, Bernard Dennielou, Eric Cauquil, Michel Voisset, Nabil Sultan,