碎屑锆石U-Pb年代学数据获取、分析与比较

张凌, 王平, 陈玺赟, 殷勇

Review in Detrital Zircon U-Pb Geochronology: Data Acquisition, Analysis and Comparison

Ling Zhang, Ping Wang, Xiyun Chen, Yong Yin

图8 由4个年龄组分[(100±10) Ma、(200±10) Ma、(300±10) Ma和(400±10) Ma]经不同比例混合得到的多个虚拟样品的2D-MDS和3D-MDS结果 (a)2D-MDS图，其中灰色的实线和虚线连接的点表示最相似的和次相似的样品;(b)2D-MDS的谢帕德图,点位分散说明样品间差异与转换结果之间的线性关系差;(c)3D-MDS（圆圈的大小仅用于增强视觉效果）;(d)3D-MDS的谢帕德图,点位相对集中1∶1线附近，改进后的拟合结果验证了增加的维数在解决样品差异方面的价值（据参考文献[58]修改）

Fig.8 The results of 2D-MDS and 3D-MDS of multiple virtual samples obtained by mixing four component[(100±10) Ma、(200±10) Ma、(300±10) Ma and(400±10) Ma] in different proportions (a) Two-dimensional MDS solid and dashed gray lines = nearest and next-nearest neighbors; (b) Shepard plot for two-dimensional MDS, The poor linearity between dissimilarities and distances indicates poor translation of the dissimilarity matrix; (c) Three-dimensional MDS (circle sizes are scaled to reflect distance of the circle from point of view of viewer, smaller is more distant); (d) Shepard plot for three-dimensional MDS. Points are relatively concentrated around the 1∶1 line. The improved fit demonstrates the value of the added dimension in resolving sample difference(modified after reference [58] )