A new set of δS,δSand δCvalues has been reported from Neoproterozoic sedimentary rocks in southern China.The i...
CHU Xuelei~(1,2**),ZHANG Qirui~1,ZHANG Tonggang~(1,2) and FENG Lianjun~(1,2) (1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
Along the Proterozoic stratigraphic sections of Jixian, Tianjin, the ??13C values of carbonates are mostly negative in the Changchengian (Changcheng System), varying approximately within a range of (0±1)‰ in the Jixianian (Jixian System), and have commonly positive values of (2±2)‰ in the Qingbaikouan (Qingbaikou System). From Chuanlinggou Formation to Dahongyu Formation, i.e. from ca. 1700 Ma to 1600 Ma, the δ13C values of carbonates increase from about -3‰ to 0‰, but oscillate with large excursion in Dahongyu Formation. Two large excursions occur in the Jixianian, one in Yangzhuang Formation and the other in the third submember of Wumishan Formation overlaying. These integrated and continuous records of carbon isotope reflect secular variations of δ13C value in ancient seawater from ca. 1700 Ma to ca. 800 Ma. The increase and subsequent oscillation of seawater δ13C value occurring from the ages of ca. 1700 to ca. 1600 Ma and ＜1300 Ma may signify two correlative global tectonic events.
CHU Xuelei, ZHANG Tonggang, ZHANG Qirui, FENG Lianjun & ZHANG Fusong1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Along the Proterozoic stratigraphic sections of Jixian,Tianjin,theδC values of carbonates are mostly negative ...
CHU Xuelei~(1,2),ZHANG Tonggang~(1,2),ZHANG Qirui~1,FENG Lianjun~(1,2) & ZHANG Fusong~1 1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China
