By Megan Lappi
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Extra resources for Birds (Prehistoric Life)
High concentrations of Ti, Cr, Pb, Ni, Cu and Zn in the C1 and C2 horizons seem mainly influenced by the mineralogical composition of the parent rock. 20 ~tg/g) represents an increase to values 10 times higher than those observed in the saprolite. 83) exists between Hg and aqua-regia-soluble A1 in both weathering profiles (Fig. 17), while almost no correlation between Hg and Fe exists (Fig. 14). e 0 5 10 15 0 5 A! 17 Correlation between Hg and aqua-regia-soluble A1 in both weathering profiles and between aqua-regia-soluble A1 and AI (XRF) in lake sediments.
Grain-size distribution illustrates the general dominance of the <20 ~am fraction (75%) accompanied by smaller amounts of both the 20-63 lain fraction (18%) and the >63 lam fraction (7%). However, contrasting patterns were observed in some layers characterized by silty-sandy sediments, which are concentrated in the upper zone IV (Fig. 2). Between depths of 40 and 80 cm, the occurrence of sandy materials was grouped into zone IVA. 9%. Mineralogical composition reflects environmental changes towards lacustrine sedimentation and more reducing conditions.
C r (pglg) 100 0 Ti (%) 1200 ~ 17n ~ ~ 300 ~ = i ~ ~=- , 39o ; "== i ~ --- ~-- 420 ~' ~ ~ ~ P-"--' 480 ~. ~ ! , 550 ~" ~ ~ 1,5 ..... ~ , ~ ............ ~ ---J A oE~0 6T0 " " 700 ," J~ 740 ~' =,, m m m m i 77o; u ~800~ 830 b, 8~o ~ , i ~ i ~ ' ' m B i J 930 " 1140 i ' m m 1230 . . . . 4 Summary diagram of chemical stratigraphy and grain size >20 Hm. Paleoenvironmental zones I to IVA as described in the text'. ,. Pollen Diagram @ o,o,o,o,o,ooot°,),,o . . . 320 ~::z,m ~ : Fe(%) Mn (pg/g) Hg (pg/g) C(org) ,20pm(%) ,ooo "°ZTI~ 20 0 i "='=" 2200 0 i ~" 0,5 " L~TLml ' ..............