Elevation or alteration? Evaluation of isotopic constraints on paleoaltitudes surrounding the Eocene Green River Basin
作者： Carrie Morrill , Paul L. Koch
DOI: 10.1130/0091-7613(2002)030<0151:EOAEOI>2.0.CO;2
关键词: Snowmelt 、 Isotope 、 Seawater 、 Drainage basin 、 Geology 、 Diagenesis 、 Paleontology 、 Geochemistry 、 Green River Formation 、 Calcite 、 Isotopes of oxygen
摘要: Low oxygen isotope values (∼−16‰, relative to Peedee belemnite standard) obtained from microbial carbonates of the Green River Formation have been interpreted as evidence for snowmelt and high elevations surrounding this early Eocene lake basin. However, low precipitates could also represent a diagenetic overprint. We investigate these alternate hypotheses by measuring composition altered unaltered freshwater bivalves analyzed subannual samples 3 individuals bulk 54 individuals. Subannual exhibit clear seasonal fluctuations in values. These are large enough require shifts temperature and/or value water. lowest any sample (either or resolution) corresponds lake-water δ 18 O ∼−12‰ (relative standard mean ocean water) is not addition lake. A few very values, which would seem suggest snowmelt. show calcite X-ray diffraction patterns, demonstrating presence precipitates. Given that (1) alteration plausible explanation (2) has examined carbonates, (3) aragonitic provide no independent waters, we conclude robust isotopic Basin during currently lacking.
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J. R. Gat, Stable Isotopes of Fresh and Saline Lakes Springer, Berlin, Heidelberg. pp. 139- 165 ,(1995) , 10.1007/978-3-642-85132-2_5
Richard D. Norris, Richard M. Corfield, Karen Hayes-Baker, Warm Climates in Earth History: Mountains and Eocene climate ,(1999) , 10.1017/CBO9780511564512.007
Kazimierz Rozanski, Luis Araguás-Araguás, Roberto Gonfiantini, Isotopic Patterns in Modern Global Precipitation Washington DC American Geophysical Union Geophysical Monograph Series. ,vol. 78, pp. 1- 36 ,(2013) , 10.1029/GM078P0001
Irving Friedman, J.R. O'Neil, Compilation of stable isotope fractionation factors of geochemical interest Data of geochemistry. ,(1977) , 10.3133/PP440KK
H.W. Roehler, Introduction to greater Green River basin geology, physiography, and history of investigations Professional Paper. ,(1992) , 10.3133/PP1506A
J. A. D. DICKSON, M. L. COLEMAN, Changes in carbon and oxygen isotope composition during limestone diagenesis Sedimentology. ,vol. 27, pp. 107- 118 ,(1980) , 10.1111/J.1365-3091.1980.TB01161.X
Richard G. Hoy, Kenneth D. Ridgway, Structural and sedimentological development of footwall growth synclines along an intraforeland uplift, east-central Bighorn Mountains, Wyoming Geological Society of America Bulletin. ,vol. 109, pp. 915- 935 ,(1997) , 10.1130/0016-7606(1997)109<0915:SASDOF>2.3.CO;2
Christina L. Negus, A quantitative study of growth and production of unionid mussels in the River Thames at Reading Journal of Animal Ecology. ,vol. 35, pp. 513- 532 ,(1966) , 10.2307/2489
Ethan L Grossman, Teh-Lung Ku, OXYGEN AND CARBON ISOTOPE FRACTIONATION IN BIOGENIC ARAGONITE: TEMPERATURE EFFECTS Chemical Geology: Isotope Geoscience Section. ,vol. 59, pp. 59- 74 ,(1986) , 10.1016/0168-9622(86)90057-6
Kathryn M. Gregory, Clement G. Chase, Tectonic significance of paleobotanically estimated climate and altitude of the late Eocene erosion surface, Colorado Geology. ,vol. 20, pp. 581- 585 ,(1992) , 10.1130/0091-7613(1992)020<0581:TSOPEC>2.3.CO;2