TY - JOUR
T1 - Oscillation of carbon and oxygen isotope compositions of carbonate rocks between evaporative and open marine environments, Upper Permian of East Greenland
AU - Magaritz, Mordeckai
AU - Stemmerik, Lars
N1 - Funding Information:
We would like to thank W.T. Holser for helpful discussionsR, . Selnlkov and N. Awad for mass spectrometrayn d X-ray measurementas,n d B. Sikker Hansen for drafting.T his work has been supportedb y grant 11-7010f rom the Danish Natural Science Research Foundation (SNF). This paperis publishedw ith permissiono f the Director
PY - 1989/6
Y1 - 1989/6
N2 - Carbon isotope data from the Upper Permian sequence of East Greenland show large variations which can be correlated with changes in sea-level and salinity. During transgression, 13C in carbonate minerals becomes enriched by 2-4‰ relative to carbonate representing regressive-evaporitic phases. Similar changes have been found in Zechstein sequences in northern Europe. It is suggested that these δ13C variations are not of basinal origin but rather represent changes in the global carbon cycle. These changes may be similar to changes in δ13C values in the glacial-interglacial cycles of the Quaternary. During regressive phases, oxidation of organic matter both on land (coal beds) and on exposed shelf areas caused 13C depletion in the dissolved inorganic carbon in the ocean. δ18O values of carbonate minerals from the evaporite part of the sequence are higher by 5-10‰ relative to carbonate from the open marine environment. Because δ18O values in the open marine carbonate samples are relatively 18O depleted (up to -9‰) it is reasonable to assume that these values cannot represent the original marine values. It is suggested that the oxygen isotope record reflects the environmental water during stages of diagenesis of the carbonate minerals; the 18O-depleted values reflect meteoric water, whereas the 18O-enriched values in the evaporitic part of the sequence reflect evaporated seawater.
AB - Carbon isotope data from the Upper Permian sequence of East Greenland show large variations which can be correlated with changes in sea-level and salinity. During transgression, 13C in carbonate minerals becomes enriched by 2-4‰ relative to carbonate representing regressive-evaporitic phases. Similar changes have been found in Zechstein sequences in northern Europe. It is suggested that these δ13C variations are not of basinal origin but rather represent changes in the global carbon cycle. These changes may be similar to changes in δ13C values in the glacial-interglacial cycles of the Quaternary. During regressive phases, oxidation of organic matter both on land (coal beds) and on exposed shelf areas caused 13C depletion in the dissolved inorganic carbon in the ocean. δ18O values of carbonate minerals from the evaporite part of the sequence are higher by 5-10‰ relative to carbonate from the open marine environment. Because δ18O values in the open marine carbonate samples are relatively 18O depleted (up to -9‰) it is reasonable to assume that these values cannot represent the original marine values. It is suggested that the oxygen isotope record reflects the environmental water during stages of diagenesis of the carbonate minerals; the 18O-depleted values reflect meteoric water, whereas the 18O-enriched values in the evaporitic part of the sequence reflect evaporated seawater.
UR - http://www.scopus.com/inward/record.url?scp=0024484307&partnerID=8YFLogxK
U2 - 10.1016/0012-821X(89)90071-X
DO - 10.1016/0012-821X(89)90071-X
M3 - Article
AN - SCOPUS:0024484307
VL - 93
SP - 233
EP - 240
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
IS - 2
ER -