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Petrographic examination of Pliocene-Pleistocene dropstones from the Northwest Pacific Ocean (ODP Sites 881-884) and from the Gulf of Alaska (ODP Site 887) reveals two contrasting clast populations. The Northwest Pacific Ocean dropstones consist largely of a suite of relatively pristine arc-derived basaltic-andesites and andesites and associated volcaniclastic rocks. Also present are older(?) variably metamorphosed felsic volcanic rocks and related volcaniclastic rocks, diverse mixed provenance sandstones, and argillite or phyllite. Plutonic crystalline rocks are a very minor component. The presence of both chert and rhodochrosite-rock clasts suggests that the dominant direction of ice rafting was from the western Bering Sea down the eastern coast of the Kamchatka Peninsula, and not eastward from across the Sea of Okhotsk. In marked contrast, the Site 887 dropstones are less diverse, being composed predominantly of arkosic and mixed-provenance sandstones, arenaceous quartzo-feldspathic foliated metasediments, semischists, and schists. Felsic and basic intrusives and highgrade metamorphic rocks constitute a subordinate contribution. Basaltic volcanic rocks are rare. Cherts are absent. The overall provenance suggested by the dropstones at Site 887 is from southeastern Alaska.

Provenance of PliocenePleistocene Ice-Rafted Debris, Leg 145, Northern Pacific Ocean

Provenance of PliocenePleistocene Ice-Rafted Debris, Leg 145, Northern Pacific Ocean