In the supercontinent of Rodinia, Baltica occurred next to Amazonia, then the two drifted away when Rodinia broke up. By the end of the Neoproterozoic, Baltica became an independent continent. At that time, Timanide orogen developed at its modern northeastern margin. In most paleogeographical reconstructions, the opposite (SW, Tornquist) edge faced the Tornquist Ocean and remained just a passive margin till the arrival of the Gondwana-born East Avalonia in the late Ordovician. However, preliminary isotopic studies of detrital zircons from the Tornquist passive margin succession hinted that rock components of Gondwana derivation reached Baltica already in the early Cambrian. In this paper, we examine 18 drill-cores of Ediacaran-Cambrian and Ordovician siliciclastic rocks from the tectonostratigraphic units along the SW–NE transect from Upper Silesia (USB) via Małopolska (MB) and the Holy Cross Mts (HCM) to the East European Platform (EEP), SE Poland, in terms of the provenance data gained from the LA-ICP-MS and SHRIMP analyses of 32 zircon samples. Rocks from all the units revealed abundant Cadomian 0.7–0.55 Ga detrital zircons (15–50% of the total analyzed grains) and other grains that yielded peaks at 0.9–1.2, 1.4–1.6, 1.8–2.2, 2.7–3.0 Ga assignable to Baltica rather than Amazonia. Such age spectra in the USB, HCM and EEP prove the proximity of peripheral (peri-Gondwanan) fragments of the Cadomian orogen to Baltica. These fragments formed the Teissyere-Tornquist Terrane Assemblage (TTA) that obliquely docked and overrode the thinned southwestern edge of Baltica which earlier accumulated Neoproterozoic rift and passive margin deposits. Our data show that in the late Ediacaran-early Cambrian, parts of the Cadomian orogenic belt became accreted to Baltica.

在罗迪尼亚州的超大陆上，波罗的海发生在亚马逊河附近，然后当罗迪尼亚州分手时，两个人就漂流了。到了新元古代，波罗的海成为一个独立的大陆。那时，Timanide造山带是在其现代东北边缘发育的。在大多数古地理重建中，相对的（SW，Tornquist）边缘面对着Tornquist海洋，并且一直是一个被动边缘，直到出生于冈瓦纳的东阿瓦罗尼亚在奥陶纪晚期才到达。然而，对Tornquist被动边缘演替的碎屑锆石的同位素初步研究表明，冈瓦纳派生的岩石成分早在寒武纪就已到达波罗的海。在本文中，我们研究了18个Ediacaran-Cambrian和Ordovician硅质碎屑岩的钻芯，这些岩心来自上西里西亚（USB），Małopolska（MB）和Holy Cross Mts（HCM）沿SW–NE断面的SW–NE断面到东欧平台（EEP） ），根据从LA-ICP-MS和SHRIMP分析得到的32个锆石样品获得的出处数据。所有单位的岩石都显示出丰富的卡多马碎屑锆石0.7-0.55 Ga（占总分析晶粒的15-50％），其他晶粒的峰值分别为0.9-1.2、1.4-1.6、1.8-2.2、2.7-3.0 Ga波罗的海而不是亚马逊。USB，HCM和EEP中的这种年龄谱证明了Cadomian造山带的外围（外围Gondwanan）碎片接近Baltica。这些碎片形成了Teissyere-Tornquist地形组合（TTA），斜向对接并覆盖了较薄的Baltica西南边缘，该边缘较早地积累了新元古代裂谷和被动边缘沉积物。我们的数据表明，在Ediacaran-Cambrian早期，Cadomian造山带的一部分开始向Baltica增生。