【摘要】 测试了四川盆地东部L2井三叠系飞仙关组碳酸盐样品87Sr/86Sr比值,以及相应的Mg,Sr和Mn的含量。在对样品进行成岩蚀变性评价的基础上,根据锶同位素地层学的原理,尝试对这些样品进行了年龄标定。4个样品分别位于L2井深度为3 297.6 m,3 290.0 m,3 268.8 m和3 201.6 m处;其87Sr/86Sr比值分别为0.707 330,0.707 340,0.707 348和0.707 383;年龄的标定结果分别为245.3 Ma,245.2 Ma,245.1 Ma和245.0 Ma。除深度3 201.6 m的样品因成岩蚀变,其年龄值的可靠程度较低以外,其余3个样品的年龄值都具有较高的可靠程度。更多还原

【Abstract】 ⁸⁷Sr/⁸⁶Sr ratios of the 4 carbonate samples collected from the Triassic Feixianguan Formation,Well Luojia 2,Eastern Sichuan were measured.The Sr concentrations of the 4 samples are（1 080）^{3 100} ppm（average（1 795） ppm）,Mn 6.2⁴2 ppm（average 16.3 ppm）,and Mn/Sr 0.007⁰.039（average 0.013）,so,it is thought that they contain information on the original seawater strontium isotope composition. According to the principle of strontium isotope stratigraphy,the authors attempt to calibrate the ages of the samples.4 samples are located at the well depths of（3 297.6） m,（3 290.0） m,（3 268.8） m and（3 201.6） m,corresponding（）⁸⁷Sr/（）⁸⁶Sr ratios are（0.707 330）,（0.707 340）,（0.707 348） and（0.707 383）,and the ages calibrated are 245.3 Ma,245.2 Ma,245.1 Ma和245.0 Ma,respectively.The age calibrated of the sample with a depth 3201.6 m,because of its higher Mn concentration（（42 ppm））,has lower reliability,but the ages calibrated from the other 3 samples are believed reliable.更多还原