کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9522664 | 1634961 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A plate tectonic mechanism for methane hydrate release along subduction zones
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
Negative carbon isotope excursions from a new record of terrestrial organic carbon (δ13Corg = â 2.3â°) and from marine carbonate (δ13Ccarb = â 0.8â°) were used to calculate a methane hydrate release of 1137 Gt of carbon over â¼Â 1 Myr during the early Aptian (Early Cretaceous). We show how the coincident and sudden near-cessation of subduction along the northern boundaries of the Farallon plate resulted in uplift along the continental margin by up to 4.0 km, which may have triggered the release. We conservatively estimated the amount of methane hydrate carbon likely to have been destabilized during the uplift and found it to be within 20% of the amount of carbon implied by the isotopic records within the same â¼Â 1 Myr time frame. Linking subduction-triggered destabilization with isotopic evidence for methane release reveals a plate tectonic mechanism for the incorporation of methane hydrate release into long-term carbon cycling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 236, Issues 3â4, 15 August 2005, Pages 691-704
Journal: Earth and Planetary Science Letters - Volume 236, Issues 3â4, 15 August 2005, Pages 691-704
نویسندگان
A. Hope Jahren, Clinton P. Conrad, Nan Crystal Arens, German Mora, Carolina Lithgow-Bertelloni,