Melt segregation from partially molten source regions: The importance of melt density and source region size
نویسندگان
چکیده
منابع مشابه
Stress-driven melt segregation in partially molten rocks
[1] We demonstrate that deformation of partially molten ductile rocks can produce melt segregation by two-phase flow. In simple shear experiments on several melt-rock systems at high temperature and pressure, melt segregates into distinct melt-rich layers oriented 20 to the shear plane. Melt segregates in samples in which pressure gradients can develop at length scales less than the sample thic...
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تشکیل ابرهای مسسفری در فصل تابستان و در ارتفاع ۸۰ تا ۹۰ کیلومتری از سطح زمین در نواحی قطبی دارای اهمیت بسیار زیادی می باشند. ارتباط مستقیم بین افزایش مشاهده این ابرها و پدیده گرم شدن کره زمین از دلایل اصلی اهمیت مطالعه این ناحیه می باشد. طبق تحقیقات انجام شده افزایش گازهای گلخانه ای باعث کاهش دما در این ناحیه از جو می شود. از طرف دیگر افزایش گاز متان و فرایند تجزیه آن توسط نور خورشید نیز باعث ا...
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[1] Anelasticity and diffusion creep viscosity of partially molten rock analogue were measured experimentally at various melt fractions (0.0025–0.04). The presence of even a small quantity of melt phase causes a significant increase in attenuation and dispersion, and decrease in viscosity (melt effect). Similar changes are additionally caused by the presence of a secondary solid component (chem...
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Acrylamide was grafted in low density polyethylene during melt processing in the presence of a free radical initiator using a torque rheometer in a closed system. Effects of processing time, acrylamide and benzoyl peroxide concentrations were studied. FTIR studies revealed that the degree of grafting increased by an increase in acrylamide concentration. Maximum grafting was obtained at 7 mi...
متن کاملMicrotomography of partially molten rocks: three-dimensional melt distribution in mantle peridotite.
The permeability of the upper mantle controls melt segregation beneath spreading centers. Reconciling contradictory geochemical and geophysical observations at ocean ridges requires a better understanding of transport properties in partially molten rocks. Using x-ray synchrotron microtomography, we obtained three-dimensional data on melt distribution for mantle peridotite with various melt frac...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 1981
ISSN: 0148-0227
DOI: 10.1029/jb086ib07p06261