Stable carbon and oxygen isotopes in Quaternary soil caronates as indicators of ecogeomorphic changes in the northern Chihuahuan Desert, USA. Monger, H. C., Cole, D. R., Gish, J. W., & Giordano, T. H. Geoderma, 1998.
abstract   bibtex   
Stable carbon and oxygen isotopes in soil carbonates provide an additional technique for investigating Quaternary ecogeomorphic changes in arid and semiarid regions. This study presents d$^{\textrm{13}}$C and d$^{\textrm{18}}$O values in surface and buried soils in a Basin and Range region of southern New Mexico and west Texas. Three landform categories were investigated for their isotopic content: (1) middle piedmont slopes; (2) a lower piedmont slope and adjacent playa depressions; and (3) an intermontane basin floor. Soils of the middle piedmont slopes had greatest d$^{\textrm{13}}$C variability, ranging from -0.6‰ in buried soils to -11.1‰ (PDB) in surface soils. Soils of the basin floor had greatest variability in d$^{\textrm{18}}$O values, ranging from -0.6 ‰ to -7.6‰ (PDB). Fossil pollen patterns roughly paralled d$^{\textrm{13}}$C shifts, with Cheno-Am pollen exhibiting greatest changes. Both isotope and pollen data across stratigraphic discontinuities suggest that a conversion from C$_{\textrm{4}}$ grasses to C$_{\textrm{3}}$ desert shrubs accomopanied Holocene erosion. © 1998 Elsevier Science B.V.
@article{monger_stable_1998,
	title = {Stable carbon and oxygen isotopes in {Quaternary} soil caronates as indicators of ecogeomorphic changes in the northern {Chihuahuan} {Desert}, {USA}},
	volume = {82},
	abstract = {Stable carbon and oxygen isotopes in soil carbonates provide an additional technique for investigating Quaternary ecogeomorphic changes in arid and semiarid regions.  This study presents d$^{\textrm{13}}$C and d$^{\textrm{18}}$O values in surface and buried soils in a Basin and Range region of southern New Mexico and west Texas.  Three landform categories were investigated for their isotopic content:  (1) middle piedmont slopes; (2) a lower piedmont slope and adjacent playa depressions; and (3) an intermontane basin floor.  Soils of the middle piedmont slopes had greatest d$^{\textrm{13}}$C variability, ranging from -0.6‰ in buried soils to -11.1‰ (PDB) in surface soils.  Soils of the basin floor had greatest variability in d$^{\textrm{18}}$O values, ranging from -0.6 ‰ to -7.6‰ (PDB).  Fossil pollen patterns roughly paralled d$^{\textrm{13}}$C shifts, with Cheno-Am pollen exhibiting greatest changes.  Both isotope and pollen data across stratigraphic discontinuities suggest that a conversion from C$_{\textrm{4}}$ grasses to C$_{\textrm{3}}$ desert shrubs accomopanied Holocene erosion.  © 1998 Elsevier Science B.V.},
	journal = {Geoderma},
	author = {Monger, H. C. and Cole, D. R. and Gish, J. W. and Giordano, T. H.},
	year = {1998},
	keywords = {JRN, stable isotopes, soil}
}

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