marine bio chem processes

Aug 14th, 2016
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MARINE BIOLOGICAL AND CHEMICAL PROCESSESI.INTRODUCTIONA.B.C.Largest volume of chemical/biol. activity in sed. env. associated with oceanic/marinedepositional systems1.70% of Earth's surface convered by ocean water: marine deposits comprise a majorportion of the sedimentary record2.Other significant chemical/biological environments include fresh-water lacustrine andsaline/brine evaporite basins.Chemical composition of surface waters1.Ocean water abundant in array of dissolved ions; major components include Cl, Na, SO4,Mg, Ca, K, HCO3, Br, and Sr. (in order of decreasing abundance see attached table)2.River water abundant in HCO3, Ca, H4SiO4, SO4, Cl, Na, Mg, and K (in order ofdecreasing abundance, see attached table)Sources of Dissolved Ionic Species1.2.3.4.D.Residence time of ionic species in seawater1.E.Residence Time: the average amount of time that a particular chemical element remainsin solution in the oceanm before precipitating. (average range in 100's of thousands tomillions of years: refer to attached table)Depositional Products Associated with Chemical/Biological Processes1.2.II.Subaerial chemical weathering of primary silicate bearing rocks, release of dissolvedions for transport in solution (rivers to oceans)Groundwater dissolution below surface, percolation and discharge to surface waterbodiesCorrosion or chemical dissolution by flowing rivers over river channel materialsVolcanic influx at mid-oceanic ri

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