Pb, Sr isotopes in organic matter of Lower Tertiary hydrocarbon source rocks in Liaohe Fault Depression

• DOI: 10.1007/bf03182707
• Publication Date: 2010-03-05T06:38:40Z
• Authors: Jinglian Zhang; Bingquan Zhu; Yixian Cheng; Xianglin Tu; Zhengling Chao; Chengjun Zhang; Qianhua Xiao; Jingyou Li; Mingzhi Piao
• Keywords: Organic geochemistry

The Pb, Sr isotopic compositions in organic matters (kerogen and soluble organic matter) of Lower Tertiary hydrocarbon source rock in Liaohe Fault Depression is first reported. There is a great variable rang of Pb isotopic compositions in kerogen,206Pb/206Pb = 17.488–18.656,207 Pb/204 Pb = 15.388–15.692,208 Pb/204 Pb = 37.656–37.484. And soluble organic matters have a very stable Pb isotopic composition, that is206Pb/204Pb = 17.424–17.601,207Pb/204Pb = 15.376–15.448,208Pb/204Pb = 37.620–37.870. Sr isotopic composition varies in the range of 0.747 59–0.716 79 in kerogen and of 0.709 67–3.747 59 in soluble organic matters that have a great range. It is shown that mantle fluid can influence organic matters and make them form hydrothermal hydrocarbon in the geoglogic environment of rift basin.