. Smithsonian miscellaneous collections . Fig. 10.—Relative percent of iron-stained quartz in the various size fractions(calculated from the total quartz content only) in Sable Island HEAVY MINERALS Relative % Fig. 11,—Relative percent of various heavy minerals in the 125 to 250 micronsize fraction including opaque heavies (percent of the total heavy mineralfraction), garnet, hornblende, and tourmaline (percent of the transparentportion only). NO. 7 SEDIMENT TRANSPORT, SABLE ISLAND JAMES & STANLEY 15 Rock fragments.—Lithic fragments are concentrated in areas thatare rich in pebbles
. Smithsonian miscellaneous collections . Fig. 10.—Relative percent of iron-stained quartz in the various size fractions(calculated from the total quartz content only) in Sable Island HEAVY MINERALS Relative % Fig. 11,—Relative percent of various heavy minerals in the 125 to 250 micronsize fraction including opaque heavies (percent of the total heavy mineralfraction), garnet, hornblende, and tourmaline (percent of the transparentportion only). NO. 7 SEDIMENT TRANSPORT, SABLE ISLAND JAMES & STANLEY 15 Rock fragments.—Lithic fragments are concentrated in areas thatare rich in pebbles and shell fragments, suggesting that lithic grainsare derived, in part, by the abrasion of pebbles. Heavy minerals (Fig. 11).—The specific gravity of the heaviesrange from (tourmaline) to (magnetite). Greatest concen-trations of heavies occur at the base of dunes along the beaches,particularly on the southern margin of the island, east of the meteoro-logical station. This is not in every case a true reflection of the totalheavy mineral assemblage, but rather of garnet and magnetite whichmake up about 70 percent of most heavy mineral fractions. Garnet, the most prolific
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
