微生物碳酸盐岩同生⁃早成岩阶段有机质降解示踪：以四川盆地灯影组四段为例

游杰,胡广,张玺华,沈安江,彭瀚霖,田兴旺,赵东方

Geochemical tracing of organic matter degradation in microbial carbonates during syngenetic⁃early diagenesis: A case study from the Member IV of Dengying Formation,Sichuan Basin

Jie You,Guang Hu,Xihua Zhang,Anjiang Shen,Hanlin Peng,Xingwang Tian,Dongfang Zhao

表1 灯四段微生物碳酸盐岩微区组构主量、微量元素特征 (×10-6)

Table 1 Major and trace elements concentrations of specific components in microbial carbonates

样品编号 HJB?K16 XJZ?K6 XJZ?K10 组别 第一组 第二组 第三组 第四组 测试点号 HJB?K16?01 HJB?K16?02 HJB?K16?03 HJB?K16?04 HJB?K16?05 HJB?K16?06 XJZ?K6?01 XJZ?K6?02 XJZ?K6?03 XJZ?K10?01 XJZ?K10?02 XJZ?K10?03 微区组构 微生物组构 微亮晶组构 亮晶组构 微生物组构 微亮晶组构 亮晶组构 微生物组构 微亮晶组构 亮晶组构 微生物组构 微亮晶组构 亮晶组构 MgCO3 (wt%) 43.62 43.29 43.03 43.11 42.23 42.57 42.57 39.87 40.32 42.90 42.71 42.58 CaCO3 (wt%) 55.87 56.23 56.49 56.32 56.84 56.91 56.10 55.36 55.19 54.92 55.87 56.02 Cr 0.71 0.64 0.08 1.03 1.27 1.32 1.26 0.65 1.06 2.13 0.33 0.11 Mn 72.24 51.34 101.06 32.88 21.69 176.24 175.72 142.62 175.20 227.11 141.03 129.06 Fe 216.88 219.00 217.11 389.27 197.78 205.86 230.03 205.76 184.58 1520.95 272.32 289.77 Cu 0.07 0.13 0.07 0.75 0.18 / 1.61 0.32 0.04 7.24 0.31 0.37 Mo / 0.03 / 0.12 0.06 / 0.07 / / / / 0.06 Sr 31.12 35.98 31.22 31.62 33.85 24.30 53.23 39.33 30.49 43.58 31.63 27.67 La 0.0025 0.0023 0.0025 0.0021 0.0048 0.0013 0.0041 0.0181 0.0114 0.0029 0.0012 0.0003 Ce 0.0017 0.0015 0.0013 0.0020 0.0026 0.0016 0.0048 0.0186 0.0165 0.0021 0.0009 0.0003 Pr 0.0025 0.0014 0.0008 0.0028 0.0057 0.0015 0.0074 0.0273 0.0208 0.0042 0.0011 0.0002 Nd 0.0015 0.0017 0.0017 0.0029 0.0044 0.0003 0.0078 0.0306 0.0236 0.0015 / / Sm 0.0021 0.0040 0.0079 / 0.0066 0.0048 0.0092 0.0378 0.0152 0.0084 / / Eu / 0.0075 / 0.0018 0.0162 / 0.0057 0.0604 0.0271 0.0069 0.0028 0.0053 Gd / / 0.0033 0.0066 / 0.0053 0.0024 0.0366 0.0478 0.0124 / 0.0024 Tb / / 0.0054 0.0036 0.0039 0.0044 0.0082 0.0261 0.0118 0.0151 0.0061 0.0039 Dy / 0.0061 0.0024 0.0049 0.0023 0.0015 0.0152 0.0458 0.0132 0.0013 / / Y 0.0030 0.0041 0.0038 0.0023 0.0049 0.0068 0.0237 0.0412 0.0291 0.0122 0.0029 0.0004 Ho 0.0045 0.0029 / 0.0015 0.0063 0.0070 0.0082 0.0322 0.0185 0.0182 0.0016 0.0016 Er 0.0056 0.0029 / 0.0088 0.0032 / 0.0215 0.0257 0.0079 0.0041 0.0016 0.0031 Tm 0.0055 0.0031 / 0.0031 / 0.0187 0.0141 0.0034 0.0034 0.0259 / 0.0033 Yb - 0.0020 / 0.0061 0.0044 0.0098 0.0116 0.0023 0.0132 0.0057 - - Lu 0.0059 0.0028 / / / / 0.0031 0.0094 / 0.0039 0.0032 / ΣREE+Y 0.426 0.465 0.438 0.529 0.818 0.487 1.766 5.355 4.002 0.881 0.220 0.080 (Nd/Yb)SN >1 0.84 >1 0.47 0.98 0.03 0.68 13.56 1.79 0.26 >1 >1 Ce/Ce* 0.69 0.78 0.78 0.83 0.50 1.15 0.84 0.82 1.03 0.60 0.77 1.39