Study on the Ar-Ar Age Spectrum of Diagenetic I/S and the Mechanism of ~(39)Ar Recoil Loss——Examples from the Clay Minerals of P—T Boundary in Changxing, Zhejiang Province
Study on the Ar-Ar Age Spectrum of Diagenetic I/S and the Mechanism of ~(39)Ar Recoil Loss——Examples from the Clay Minerals of P—T Boundary in Changxing, Zhejiang Province
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发表时间：
2006
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通讯作者：
Zhang Yan
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作者：
Zhang Yan
采用K-Ar法和40Ar/ 39Ar法测定了浙江长兴P-T界线的成岩I/S。结果表明：(1)纯成岩I/S的K-Ar年龄小于P-T边界年龄；(2)它们的40Ar/ 39Ar年龄谱呈阶梯状，且当蒙脱石类夹层比例为零（纯伊利石）时，40Ar*/ 39Ar的增幅为零，呈现平坦的年龄谱；(3)粘土矿物的39Ar反冲损失不仅存在于粘土矿物的外部，也存在于粘土矿物的内部，反冲损失可达~48%；(4) 0.2 μm的分数可能是39Ar反冲损失的影响点，且39Ar反冲距离可达0.2 μm。
We dated the diagenetic I/S of P-T boundary in Changxing, Zhejiang Province using K-Ar and 40Ar/ 39Ar method. The results show that: (1) the K-Ar ages of pure diagenetic I/S is younger than the age of the P-T boundary, (2) their 40Ar/ 39Ar age spectrum show staircase-shaped and when the proportion of smectite-like interlayers is zero(pure illite) ,the rate of increase of the 40Ar*/ 39Ar is zero, showing flat age spectrum, (3) 39Ar recoil loss not only exist in the outer part but also in the inner part of the clay minerals and the recoil loss can up to ～48%, and (4) 0.2 μm fraction may be the inflection for the 39Ar recoil loss and the 39Ar recoil distance can up to 0.2 μm.