A maximum depositional age (MDA) of 551.2 ± 4.2 Ma for the black argillites of the Kalyus Beds, Nagoryany Formation (East European Platform, northeastern Republic of Moldova) is reported based on the youngest cluster of detrital zircons dated by LA-ICP-MS. Their source can be linked to an arc-related volcanism that fed the tuffite layers interbedded in the basal part of the Kalyus Beds and reasonably support our inference that the reported MDA is consistently compatible with the true depositional age (TDA) of the Kalyus Beds. The volcanic event that led to ash deposition for the tuffites may be related to the active margin processes which developed adjacent to the Baltica palaeocontinent. Hf isotope values of two detrital zircons from the youngest cluster suggest mantle input, and a third detrital zircon was derived from felsic rocks that originated from re-melting of the older crustal rocks. The older detrital zircon clusters correlate well with known published ages of the different lithotectonic units from the East European Platform. The precise geochronological U–Pb ages, including the Kalyus detrital zircon age, offer outstanding data to calibrate the sedimentary and volcanic events, and the evolution of the Ediacaran biota in the Moldova-Podillya Basin, specifically the Miaohe biota biozone, for which a few newly identified taxa significantly increase its taxonomic diversity. The anoxic conditions together with the associated phosphorites that controlled the deposition of the Kalyus argillites represent a major depositional event in this area of the Baltica palaeocontinent, and can be correlated with other worldwide anoxic events during the late Ediacaran.

根据LA-ICP-MS测得的最年轻碎屑锆石簇，据报道Nagoryany组（摩尔多瓦共和国东北部的东欧平台）的Kalyus床的黑色浮泥的最大沉积年龄（MDA）为551.2±4.2 Ma。 。它们的来源可以与弧相关的火山作用联系在一起，该火山提供了埋藏在Kalyus床基部中的辉灰岩层，并合理地支持了我们的推断，即所报道的MDA始终与Kalyus床的真实沉积年龄（TDA）兼容。导致凝灰岩灰分沉积的火山事件可能与在波罗的海古大陆附近发展的活动边缘过程有关。来自最年轻星团的两个碎屑锆石的Hf同位素值表明地幔输入，第三个碎屑锆石则来自长老地壳岩石重熔产生的长英质岩石。较旧的碎屑锆石团簇与东欧平台不同岩相构造单元的已知已公布年龄相关。精确的年代学U–Pb年龄，包括Kalyus碎屑锆石年龄，为校准沉积和火山事件以及摩尔多瓦-波迪利亚盆地Ediacaran生物区系（特别是Miaohe生物区系）的演化提供了出色的数据。新近确定的分类单元大大增加了其分类学多样性。缺氧条件以及控制磷钾钾钾榴石的沉积的相关磷矿一起，代表了该地区波罗的海古大陆的主要沉积事件，