江苏宁镇伏牛山岩体的铷锶等时线年龄  

Ru-Sr Isotime Line Age of Funiushan Rockbodies in Nanjing-Zhenjiang Area, Jiangsu Province

作　　者：叶水泉 

机构地区：[1]华东有色地质勘查局,江苏南京210007

出　　处：《江苏地质》1999年第3期148-150,共3页Jiangsu Geology

摘　　要：从伏牛山岩体采集了新鲜的花岗闪长斑岩作铷锶同位素年龄测定,得到了拟合度很好的RbSr岩体矿物等时线,获得111Ma±1Ma年龄和锶的初始比值(Sr87/Sr86)i为07058±00001。进一步印证该岩体形成于燕山晚期,为幔源岩浆受地壳物质混染后的产物。Based on the confirmation of the occurrences of Funiushan composite rockbodies, the author collected some fresh samples of granodiorite porphyry rockbodies for the dating of Rb Sr isotopic age. As a result, a well fitted Rb Sr rock mineral isotime line, 111±1 Ma isotopic age of the rockbodies and the initial strontium isotopic ratio(Sr 87 /Sr 86 ) 0 705 8±0 000 1 were obtained. The age and initial ratio can reflect the diagenetic age and the origin of magma of the rockbodies, and furtherly verify the formation of the rockbodies were in Late Yenshan Period,being originated from the mantle magma contaminated with crustal materials and classified as syntectic genetic series.

关 键 词：铷锶等时年龄 伏牛山岩体 江苏 花岗闪长斑岩 燕山晚期 拟合度 

分 类 号：P588.12[天文地球—岩石学] P597[天文地球—地质学]