کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8907084 | 1634669 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation of fast-spreading lower oceanic crust as revealed by a new Mg-REE coupled geospeedometer
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Formation of fast-spreading lower oceanic crust as revealed by a new Mg-REE coupled geospeedometer Formation of fast-spreading lower oceanic crust as revealed by a new Mg-REE coupled geospeedometer](/preview/png/8907084.png)
چکیده انگلیسی
Applications of this new geospeedometer to oceanic gabbros from the fast-spreading East Pacific Rise at Hess Deep reveal that the lower oceanic crust crystallized at temperatures of 998-1353â°C with cooling rates of 0.003-10.2â°C/yr. Stratigraphic variations of the cooling rates and crystallization temperatures support deep hydrothermal circulations and in situ solidification of various replenished magma bodies. Together with existing petrological, geochemical and geophysical evidence, results from this new speedometry suggest that the lower crust formation at fast-spreading mid-ocean ridges involves emplacement of primary mantle melts in the deep section of the crystal mush zone coupled with efficient heat removal by crustal-scale hydrothermal circulations. The replenished melts become chemically and thermally evolved, accumulate as small magma bodies at various depths, feed the shallow axial magma chamber, and may also escape from the mush zone to generate off-axial magma lenses.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 487, 1 April 2018, Pages 165-178
Journal: Earth and Planetary Science Letters - Volume 487, 1 April 2018, Pages 165-178
نویسندگان
Chenguang Sun, C. Johan Lissenberg,