کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6437320 1637970 2016 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fluid composition of the sediment-influenced Loki's Castle vent field at the ultra-slow spreading Arctic Mid-Ocean Ridge
ترجمه فارسی عنوان
ترکیب مایع لایه گودال قلعه لکی تحت تاثیر رسوب در ناحیه اقیانوس آرام غربی اقیانوس آرام
کلمات کلیدی
قلعه لکی، قطب شمال میانه اقیانوس ها، ردیف گسترش بسیار کم، مایعات هیدروترمال، رسوب تحت تأثیر، گازها،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی

The hydrothermal vent field Loki's Castle is located in the Mohns-Knipovich bend (73°N) of the ultraslow spreading Arctic Mid-Ocean Ridge (AMOR) close to the Bear Island sediment fan. The hydrothermal field is venting up to 320° C hot black smoker fluids near the summit of an axial volcanic ridge. Even though the active chimneys have grown on a basaltic ridge, geochemical fluid data show a strong sedimentary influence into the hydrothermal circulation at Loki's Castle. Compelling evidence for a sediment input is given by high alkalinity, high concentrations of NH4+, H2, CH4, C2+ hydrocarbons as well as low Mn and Fe contents. The low δ13C values of CO2 and CH4 and the thermogenic isotopic pattern of the C2+ hydrocarbons in the high-temperature vent fluids clearly point to thermal degradation of sedimentary organic matter and illustrate diminution of the natural carbon sequestration in sediments by hydrothermal circulation. Thus, carbon-release to the hydrosphere in Arctic regions is especially relevant in areas where the active Arctic Mid-Ocean Ridge system is in contact with the organic matter rich detrital sediment fans.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 187, 15 August 2016, Pages 156-178
نویسندگان
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