نتایج جستجو برای: petrogenesis
تعداد نتایج: 1010 فیلتر نتایج به سال:
In this paper, we report analysis of various basaltic lunar samples including 14053 and 14072, KREEP basalt 15386, thirty basalt clasts from Apollo 14 breccia 14321, as well as impact-generated samples (matrix from breccia 14168, olivine vitrophyres 14321,1180 and 14321,1539, and impact melt 14310) using a combination of solution and laser ablation inductively coupled plasma mass spectrometry (...
Northwest Africa (NWA) 4898 is the only low-Ti, high-Al basaltic lunar meteorite yet recognized. It predominantly consists of pyroxene (53.8 vol%) and plagioclase (38.6 vol %). Pyroxene has a wide range of compositions (En12–62Fs25–62Wo11–36), which display a continuous trend from Mg-rich cores toward Ca-rich mantles and then to Fe-rich rims. Plagioclase has relatively restricted compositions (...
The physical behavior of silicate melts during the final stages of intrusion in the earth's crust are poorly understood. In particular, the low temperature limit of igneous petrogenesis is poorly constrained. The extreme differentiates of granitic magmatism that lead to pegmatite genesis span a very large range of composition not normally considered to be within the domain of igneous melt compo...
Stable Ca isotopes are an increasingly useful tool for understanding the sources and processes leading to formation of magmatic rocks, yet isotope fractionation during genesis silicic continental crust is still poorly understood. Here, we present Ca, Sr, Nd isotope, as well major- trace-element whole-rock geochemical data A-, I-, S-type granites (n = 30) from Australia/Tasmania, Canada, France ...
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