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In the central Oregon Cascades, extension of the arc has promoted eruption of primitive basalts that are of three types, calcalkaline (CAB), low K tholeiitic (LKT) and rare absarokitic (ABS) in the forearc. Based on a comparison with the distribution of primitive magma types and their 87 Sr/ 86 Sr and 143 Nd/ 144 Nd isotopic signature in the Cascades, we divide the...
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