نتایج جستجو برای: type flood basalts
تعداد نتایج: 1365507 فیلتر نتایج به سال:
Oxygen and iron isotope analyses of low-Ti and high-Timare basalts are presented to constrain their petrogenesis and to assess stable isotope variations within lunar mantle sources. An internally-consistent dataset of oxygen isotope compositions of mare basalts encompasses five types of low-Ti basalts from the Apollo 12 and 15 missions and eight types of high-Ti basalts from the Apollo 11 and 1...
Major, trace element, and Nd–Sr–Pb isotopic compositions of mantle xenolith-bearing Cenozoic basalts in southeastern China are measured to provide an insight into the nature of their mantle sources and processes. Application of a modified Ž . dynamic melting inversion DMI method presented here to SE China basalts suggests that Nushan and Fangshan basalts are formed by 4–11% partial melting of a...
Abstract Two subvertical gabbroic dikes with widths of ~ 350 m (East-Muren) and ≥ 500 (West-Muren) crosscut continental flood basalts in the Antarctic extension 180 Ma Karoo large igneous province (LIP) Vestfjella, western Dronning Maud Land. The exhibit unusual geochemical profiles; most significantly, initial (at Ma) ε Nd values increase from dike interiors towards hornfelsed wallrock (from −...
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