GDGTs在黄土古环境重建中的研究进展

田少华, 肖国桥, 杨欢

Application of Glycerol Dialkyl Glycerol Tetraether Lipids in Paleoenvironment Reconstruction of Loess Deposits: A Review of Recent Progresses

Shaohua Tian, Guoqiao Xiao, Huan Yang

表1 黄土中常见的bGDGTs指标

Table 1 The common bGDGTs indicators in loess

指标 计算公式 参考文献 MBT MBT=(Ia+Ib+Ic)/(Ia+Ib+Ic+IIa+IIa'+IIb+IIb'+IIc+IIc'+IIIa+IIIa'+IIIb+IIIb'+IIIc+IIIc') [14] MBT' MBT'=(Ia+Ib+Ic)/(Ia+Ib+Ic+IIa+IIa'+IIb+IIb'+IIc+IIc'+IIIa+IIIa') [61] MBT'5ME MBT'5ME =(Ia+Ib+Ic)/(Ia+IIa+IIIa+Ib+IIb+Ic+IIc) [54] Index1 Index1=lg(Ia+Ib+Ic+IIa'+IIIa')/(Ic+IIa+IIc+IIIa+IIIa') [54] MBT5/6 MBT5/6=(Ia+Ib+Ic+IIa')/(Ia+IIa+IIIa+IIIa'+Ib+IIb+Ic+IIc) [62] CBT CBT=-lg[(Ib+IIb+IIb')/(Ia+IIa+IIa')] [14] CBT' CBT'=lg[(Ic+IIa'+IIb'+IIc'+IIIa'+IIIb'+IIIc')/(Ia+IIa+IIIa)] [54] IRIIa' IRIIa'=IIa'/(IIa+IIa') [63] IRIIIa' IRIIIa' =IIIa'/(IIIa+IIIa') [63] IBT IBT=-lg[(IIIa'+IIa')/(IIIa+IIa)] [62] rCBT rCBT=-lg[(Ib+IIb+IIb')/Ia] [64] Ri/b Ri/b=∑iGDGTs/∑bGDGTs [65] BIT BIT=(Ia+IIa+IIIa+IIa'+IIIa')/Crenarchaeol [66]