Provenance of Neoproterozoic and early Paleozoic siliciclastic rocks of the Teplá-Barrandian unit (Bohemian Massif): Evidence from U–Pb detrital zircon ages

Provenance of Neoproterozoic and early Paleozoic siliciclastic rocks of the Teplá-Barrandian unit (Bohemian Massif): Evidence from U–Pb detrital zircon ages
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Teplá-Barrandian 单元(波希米亚地块)新元古代和早古生代硅质碎屑岩的物源:来自 UâPb 碎屑锆石年龄的证据

DOI:
10.1016/j.gr.2010.05.003
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发表时间:
2010
期刊:
影响因子:
6.1
通讯作者:
Storey
Storey
中科院分区:
地球科学1区
文献类型:
--
作者:
K. Gerdes;Jeffries;Linnemann;Storey

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利用来自埃迪卡拉纪和古生代硅质碎屑岩的新的LA-ICPMS碎屑锆石年龄,对波希米亚地块(中欧,捷克)中心的特普拉-巴兰迪亚单元(TBU)的物源和古地理亲缘关系进行了限制。采集的样品跨度从≤635 Ma到∼385 Ma,并允许识别反映大地构造制度变化的物源变化。两个埃迪卡拉纪、一个下寒武统和三个上奥陶统样品的碎屑锆石年龄谱与冈瓦那西北部非洲地区,特别是跨撒哈拉带的年龄相似,而从下寒武统较高到最低奥陶系的三块岩石含有可能完全来自当地来源的碎屑。泥盆纪岩石的年龄谱是北西贡德瓦南和当地特征的结合。这些新发现与广泛发表的数据相结合,与冈瓦那边缘新元古代俯冲相关的背景相一致,随后是寒武纪/早奥陶世裂谷阶段和奥陶纪被动边缘背景。此外,这些数据支持在整个瓦里斯卡期前的冈德瓦南边缘的TBU的位置。
New LA-ICP-MS U–Pb detrital zircon ages from Ediacaran and Paleozoic siliciclastic rocks are used to constrain provenance and paleogeographic affinities of the Teplá-Barrandian unit (TBU) in the centre of the Bohemian Massif (Central Europe, Czech Republic). The samples taken span the period from ≤635Ma to ∼385Ma and permit recognition of provenance changes that reflect changes in geotectonic regime. Detrital zircon age spectra of two Ediacaran, one Lower Cambrian and three Upper Ordovician samples resemble the ages known from the NW African proportion of Gondwana, particularly the Trans-Saharan belt, while three rocks from higher Lower Cambrian to Lowermost Ordovician strata contain detritus that may have been derived exclusively from local sources. The age spectrum of the Devonian rock is a combination of the NW Gondwanan and local features. These new findings in combination with a wide range of published data are in agreement with a Neoproterozoic subduction-related setting at the margin of Gondwana followed by a Cambrian/Early Ordovician rifting stage and an Ordovician passive margin setting. Furthermore the data are in favour of a position of the TBU at the Gondwanan margin throughout pre-Variscan times.
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