Sedimentation Characteristic and Carbon Isotope Composition in Late Paleoproterozoic Xingditage Group in Quruqtagh Region of Xinjiang, China

The Xingditage Group in the Quruqtagh region of Xinjiang is considered as the Late Paleoproterozoic stratigrap by whose age is 2063.28Ma to 2321.4Ma from Pb isotopic dating. The carbon isotopic composition of marble of the Xinge'er Formation of Xingditage Group shows that its carbon iso topic composition ranges from 5.15‰ PDB to-0.79‰ PDB,and most carbon isotopic data distribute In 2‰ PDB,much different from δ¹³C carb composition (0‰~1‰ PDB)in early Middle Proterozoic(1 600 ~1 400Ma).