塔里木盆地柯坪地区下寒武统肖尔布拉克组地球化学特征及其沉积和成岩环境意义
郑剑锋,黄理力,袁文芳,朱永进,乔占峰

Geochemical features and its significance of sedimentary and diagenetic environment in the Lower Cambrian Xiaoerblak Formation of Keping area, Tarim Basin
Jian-feng ZHENG,Li-li HUANG,Wen-fang YUAN,Yong-jin ZHU,Zhan-feng QIAO
表4 肖尔布拉克组微生物白云岩及其碳酸盐胶结物U—Pb同位素年龄测试结果
Table 4 U-Pb isotopic dating of Xiaoerblak Formation microbial dolomite
样品编号产状同位素年龄/Ma样号产状同位素年龄/Ma
X1-C1a微生物岩围岩517±30X1-C3b孔洞中方解石471±10
X1-C1b孔缝中鞍状白云石45±69X1-C4a微生物岩围岩512±11
X1-C1b孔缝中鞍状白云石29±43X1-C4b裂缝中方解石204±37
X1-C2a微生物岩围岩515±32X1-C4c裂缝中方解石205±10
X1-C2b孔洞中方解石495±12X1-C5a微生物岩围岩499.6±8.3
X1-C3a微生物岩围岩480±25X1-C5b孔洞中方解石481±29