中文摘要：

整个岩石的 Sm-Nd 同位素在华南从在扬采·布洛克和卡西西亚·布洛克之间的 Jinggangshan 区域为寒武纪奥陶纪的阶层被调查。这些阶层是被扔一极大地有设置的碳酸盐和器官的忍受碳的层的泥泞沙的薄板的厚单位。他们有低 ɛ _{到 −7.9 和旧 Nd 的 −13.9 的 Nd} (t) 价值为 1842 ～ 2375 妈的年龄建模。在 t _DM -t _Str 图，他们是远的离开一致的线，但是在进化地区以内掉落原生地华南的外壳。这显示寒武纪奥陶纪的阶层主要由事组成从可以主要在卡西西亚·布洛克与高成熟由导出大陆人的由岩屑形成的沉积组成的古老的 Paleoproterozoic 外壳侵蚀了。然而，奥陶纪 Jueshangou 形成和 Dui'ershi 形成有 ɛ _{在上述范围的高端和在上面的更低的结束的 1842 ～ 2059 妈的 Nd 模型年龄的 −10.5 和 −7.9 的 Nd} (t) 价值变化。这建议被侵蚀从的更多的岩屑的参与相对从迟了的 Paleoproterozoic 的少年外壳到早 Neoproterozoic。所有 Nd 模型在卡西西亚·布洛克为寒武纪奥陶纪的沉积岩石变老，扬采·布洛克的东南的边缘比 1800 妈旧，建议从早古生代的弄空的导出披风的岩浆的材料都不涉及这些区域。

英文摘要：

Whole-rock Sm-Nd isotopes were investigated for Cambrian-Ordovician strata from the Jinggangshan area between the Yangtze Block and Cathysia Block in South China. These strata were deposited as a greatly thick unit of muddy-sandy laminas with intercalated carbonate and organic carbon-bearing layers. They have low εNd（t） values of -13.9 to -7.9 and old Nd model ages of 1842 to 2375 Ma. In tDM-tStr diagram, they are far away from the concordant line but fall within the evolution zone of the Proterozoic crust of South China. This indicates that the Cambrian-Ordovician strata are mainly composed of matters eroded from ancient Paleoproterozoic crust that may mainly consist of continental-derived detrital sediments with high maturity in the Cathysia Block. However, the Ordovician Jueshangou Formation and Dui＇ershi Formation have εNd（t） values of -10.5 and -7.9 at the higher end of the above range and Nd model ages of 1842 to 2059 Ma at the lower end of the above range. This suggests involvement of more detritus that were eroded from the relatively juvenile crust from Late Paleoproterozoic to the Early Neoproterozoic. All the Nd model ages for the Cambrian-Ordovician sedimentary rocks in the Cathysia Block and the southeastern margin of the Yangtze Block are older than 1800 Ma, suggesting that no material from the Early Paleozoic depleted mantle-derived magmas was involved in these regions.