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《GEOCHIMICA》 1995-S1
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OXYGEN ISOTOPE GEOCHEMISTRY OF EARLY PROTEROZOIC HUTUO GROUP DOLOMITES WUTAISHAN MOUNTAIN AREA

Zhong Hua(Institute of Geology, The Chinese Academy of sciences, Beijing 100029)Ma Yongsheng (Research institute of Petroleum Exploration and Development, Beijing 100083)  
Oxygen isotope compositions of Early Proterozoic Hutuo Group dolomites from the typical profile in Wutaishan Mountain area, Shanxi Province, North China, are reported. The mean sampling interval was 8m and total 484 micritic dolomites were analysed for oxygen isotope. The whole rock dolomite oxygen isotope results show that the δ ̄(18)O values distinctly change with geological time, but are relatively stable in certain horizon. The δ ̄(18)O values are regularly distributed in the profile studied. It is difficult to interpret theδ ̄(18)O variation using dolomite diagenesis. So the trend of oxygen isotope evolution is a reflection of δ ̄(18)O change in early Proterozoic sea water. The good relationship between δ ̄(18)O and the horizon of strata may provide a new method for carbonate strata correlation in early Proterozoic. There are higher δ ̄(18)O values in Beidaxing Formation. The higher δ ̄(18)O value is -3.7‰ (PDB) which is 4‰ higher than the highestδ ̄(18)O in early Proterozoic dolomites reported.
【Fund】: 国家自然科学基金 北京中关村联合分析测试中心资助
【CateGory Index】: P588.2
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