کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9522714 | 1634970 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shock-induced dehydrogenation of polycyclic aromatic hydrocarbons with or without serpentine: Implications for planetary accretion
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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
Polycyclic aromatic hydrocarbons (PAHs) were shocked across a peak shock pressure range of 5.8 to 36.6 GPa with or without serpentine and were then evaluated with an elemental analyzer, an X-ray diffractometer, a gas chromatograph, and a gas chromatograph-mass spectrometer. On the basis of the results, we examined the shock-induced dehydrogenation of PAHs and the matrix's effects on it. Moreover, we discussed the hydrogen amounts supplied to the Earth's atmosphere and interior during its formation, as well as the δD values of those amounts. We did not find any matrix effects on the dehydrogenation of PAHs in the pressure range used in this study. The incipient dehydrogenation of PAHs occurred at 10 GPa and dehydrogenation was almost completed at 36.5 GPa. Assuming that carbonaceous chondrites, such as the Murchison meteorite accreted on and formed the Earth, they should have started and completed dehydrogenation at a point where the growing Earth reached a radius of 1020 km and 3060 km, respectively. By the end of the accretion, most of the hydrogen delivered to the Earth had been discharged into the atmosphere. The cumulative amount of hydrogen in the Earth's interior at that point and its δD value were calculated to be 3.3Ã1021 kg and â47â°, respectively. These calculated data were comparable to those already established for the Earth's interior. However, to explain the isotopically light-juvenile hydrogen (D=â125â°) in the deep Earth reported by Hauri, Chem. Geol. 183 (2002) 115-141, we should consider materials that have low δD values (e.g., â850â° of the presolar nebular) as sources of the Earth's hydrogen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 232, Issues 1â2, 30 March 2005, Pages 143-156
Journal: Earth and Planetary Science Letters - Volume 232, Issues 1â2, 30 March 2005, Pages 143-156
نویسندگان
Koichi Mimura, Seiji Toyama, Kenichiro Sugitani,