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Distribution of Carbon and Oxygen Isotopes in the Sequence Stratigraphic Framework of the Middle and Upper Proterozoic in the Ming Tombs Area, Beijing
Author(s) -
Rufeng LI
Publication year - 1998
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1998.tb00396.x
Subject(s) - terrigenous sediment , sedimentary depositional environment , geology , proterozoic , isotopes of carbon , sequence (biology) , sedimentary rock , paleontology , isotopes of oxygen , carbonate , carbon fibers , isotope , geochemistry , mineralogy , total organic carbon , chemistry , environmental chemistry , structural basin , biochemistry , materials science , physics , organic chemistry , quantum mechanics , composite number , composite material , tectonics
This paper discusses the distribution pattern and geological significance of the carbon and oxygen isotopes (δ 13 C and δ 18 O) in the depositional sequences of Gaoyuzhuangian, Yangzhuangian and Wumishanian ages of the established Middle and Upper Proterozoic sequence stratigraphic framework in the Ming Tombs area lying in western Yanshan Mountain of Beijing. Besides, sketchy determination of δ 13 C and δ 18 O was also performed for other formations and members. The analytical results show the following: under the condition of clear‐water carbonate sediments, δ 13 C and δ 18 O, featuring smaller variation of δ 13 C but larger variation of δ 18 O, can well delineate the relative change of sea level, which reflects the difference of primary sedimentary settings; in the presence of terrigenous substances, δ 13 C values vary greatly while δ 18 O slightly; the carbon and oxygen isotopes show marked changes at sequence boundaries. Besides, particular patterns can be found in regard to the distribution of carbon and oxygen isotopes within the sequences.