Poster Number 124
See more from this Division: General Discipline Sessions
See more from this Session: Sediments, Carbonates / Clastic (Posters)
Abstract:
Two of the cores are from the Forest City Basin (FCB) in northwest Missouri and two are from the Nemaha Uplift (NU) in northern Kansas, approximately 185km west. The two basinal cores are characterized by relatively high TOC (>25% max values), good correlation between TOC and trace metal variation, relatively low Si/Al ratios, and relatively high (CIA-CaO) values. The uplift cores are characterized by comparatively low TOC (<25%), poor correlation between TOC and trace metal variation, relatively high Si/Al ratios, and relatively low (CIA-CaO) values.
We interpret these patterns as follows. The FCB is dominated by subaqueous deposition of clay- and organic detritusrich sediment from a mature source under protracted anoxic/euxinic conditions, which is a clear signature of the equatorial estuarine circulation system. However, the NU experienced a weaker, fluctuating redox system with a subtle but significant contribution of non-clay detritus from a less mature source area. We interpret this contribution as eolian dust derived from paleo-northeastern cratonic sources.
See more from this Division: General Discipline Sessions
See more from this Session: Sediments, Carbonates / Clastic (Posters)