Basins lacustrine

Arenas C, Pardo G (1999) Latest Oligocene-Late Miocene lacustrine systems of the north-central part of the Ebro Basin (Spain) sedimentary facies model and palaeogeographic synthesis. Palaeogeogr Palaeoclimatol Palaeoecol 151 127-148... 

With hydraulic residence times ranging from months to years, lakes are efficient settling basins for particles. Lacustrine sediments are sinks for nutrients and for pollutants such as heavy metals and synthetic organic compounds that associate with settling particles. Natural aggregation (coagulation) increases particle sizes and thus particle settling velocities (Eq. 7.1) and accelerates particle removal to the bottom sediments and decreases particle concentrations in the water column. 

Non-metamorphic equivalents of this Th-free mineralization may be sought in some rare limestone-hosted U-occurences, such as the Jurassic Todilto lacustrine formation in the Grant Uranium Belt (Rawson Richard 1980), the Cretaceous Toolebuc marine formation in Eromanga Basin (Ramsden 1982), the Mesoproterozoic Vempale marine formation in Cuddapah Basin (Sinha et al. 1989), and the Cretaceous Probeer marine formation in the Huab deposit (Hartleb 1988). 

After initial sedimentation, the burial of sediments is usually accomplished rapidly in nearshore or lacustrine basin environments. 

The initial increase in hydrostatic pressure in a sedimentary basin appears not to change mineral stabilities from those of the weathering environment. The formation of potassic, iron-rich micas such as ferric illite and glauconite both in lacustrine and shallow ocean basins demonstrates their stability at low pressures and temperatures. The same is true of the 7 8 chlorite chamosite or berthierine. Most likely the chemical variables of pH, Eh and the activity of the various ions in solution are predominant in silicate phase equilibria in sedimentary environments. 

Smedley, P.L., Zhang, M Zhang, G. and Luo, Z. (2003) Mobilisation of arsenic and other trace elements in fluvio-lacustrine aquifers of the Huhhot Basin, Inner Mongolia. Applied Geochemistry, 18(9), 1453-77. 

A final example comes from the Nima basin located 450 km northwest of Lhasa at about 4500 m, in the southern part of the Bangong suture zone, which separates the Qiangtang and Lhasa terranes in central Tibet (Fig. lb). The southern Nima basin contains more than 4 km of Tertiary alluvial, lacustrine, and lacustrine fan-delta deposits that accumulated next... 

Paleoelevation reconstruction is a relatively new science. Of the several approaches under development, the use of oxygen isotopes in pedogenic carbonates enjoys several advantages. As to soils themselves, pedogenic carbonate is relatively common in basin deposits of many orogens, especially on the drier leeside. Futhermore, soils form in the presence of local rainfall, and hence are not influenced by the 8lsO value of run-off from higher elevations in the way that, for example, riverine and lacustrine carbonates could be. 

The river mouth area is characterized by accumulative land forms flooded with river water and sometimes with water of the receiving basin, low-lying lands composed of interpenetrating layers of fluvial, marine, and lacustrine deposits. 

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