. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 170' 168° 164 160° 158 Figure 19-16. Distribution of illite (%) in <2 idm size fraction of surficial sediments of southeastern Bering Sea. Island. The region extending off the Yukon River north up to the eastern margin of the Chirikov Basin, the western portion of Norton Sound, and the Shpanberg Strait demonstrate significantly higher kaohnite/chlorite ratios. This is attributable to a local terrigenous source and current dispersal. The presence of notably high concentrations of expan
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . 170' 168° 164 160° 158 Figure 19-16. Distribution of illite (%) in <2 idm size fraction of surficial sediments of southeastern Bering Sea. Island. The region extending off the Yukon River north up to the eastern margin of the Chirikov Basin, the western portion of Norton Sound, and the Shpanberg Strait demonstrate significantly higher kaohnite/chlorite ratios. This is attributable to a local terrigenous source and current dispersal. The presence of notably high concentrations of expand- able component south of St. Lawrence Island is difficult to explain. Possibly clays of the region are relict and have been formed by alteration of local volcanic debris. The distribution patterns of clay minerals, together with corresponding information from north of the Bering Strait not considered above, support the common thesis that the Chukchi Sea is the major depositional site for clay-size sediment from the Yukon River. SEDIMENT HEAVY METALS Since the specialized sampler required to obtain contamination-free surficial sediment samples could not operate in sandy or coarser sediment, only a limited set of samples was available to us for this phase of the study. Both total and extractable (
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