Low river levels are crippling barge traffic and grain exports
Barges are moving along the Mississippi River much more slowly and with lighter loads as they try to get corn and soybean harvest to ports.
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Barges are moving along the Mississippi River much more slowly and with lighter loads as they try to get corn and soybean harvest to ports.
Barges are moving along the Mississippi River much more slowly and with lighter loads as they try to get corn and soybean harvest to ports.
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Jian Xu; Xiao-Ping Xia; Qiang Wang; Christopher J. Spencer; Bin He ... Abstract: The mechanisms and processes by which subducted slab interacted with mantle plume remain controversial, as direct observation of such interaction is difficult to impossible. Compositional heterogeneity of large igneous provinces (LIPs) additionally makes plume-slab interaction hard to detect. Oxygen isotopes are sensitive enough to trace the source of magmas. Here we provide evidence for plume-slab interaction mainly based on in situ zircon Hf-O isotope analyses, as well as whole-rock elemental and Sr-Nd-Hf isoto...