|Title||Stable carbon and oxygen isotopes in Quaternary soil caronates as indicators of ecogeomorphic changes in the northern Chihuahuan Desert, USA|
|Publication Type||Journal Article|
|Year of Publication||1998|
|Authors||H. Monger C, Cole DR, Gish J.W, Giordano T.H|
|Keywords||article, articles, climate,paleoclimate, isotopes, stable, journal, journals, paleoclimate, paleosols, soil, paleoclimate, soil, paleosols, soil, pedogenic carbonates, soil, stable isotopes|
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 d13C and d18O 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 d13C variability, ranging from -0.6‰ in buried soils to -11.1‰ (PDB) in surface soils. Soils of the basin floor had greatest variability in d18O values, ranging from -0.6 ‰ to -7.6‰ (PDB). Fossil pollen patterns roughly paralled d13C shifts, with Cheno-Am pollen exhibiting greatest changes. Both isotope and pollen data across stratigraphic discontinuities suggest that a conversion from C4 grasses to C3 desert shrubs accomopanied Holocene erosion. © 1998 Elsevier Science B.V.