Elephant Moraine 87521 : two pyroxenes , two chromites , and two ilmenites , but only one fractionation series
نویسنده
چکیده
Introduction: Elephant Moraine (EET) 87521 is a polymict mare basalt breccia containing very-low-titanium (VLT) basalt components and rarer KREEP components. [1] showed that within pyroxene from VLT lithic clasts of EET87521, there were two distinct trends in a plot of Ti/(Ti+Cr) versus Fe/(Fe+Mg) (Figure 1). They suggested that the two fractionation trends (A and B) were the result of different VLT lavas that had different original Ti/(Ti+Cr) and/or Fe/(Fe+Mg) ratios. They further suggested the two lavas may derive from the same source magma and simply experienced different degrees of olivine fractionation. [2] arrived at a similar conclusion that EET87521 pyroxenes represent two separate magmas based on their REE and major element compositions.
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