Geochronological, geochemical and isotopic study of detrital zircon suites from late Neoproterozoic clastic strata along the NE margin of the East European Craton : implications for plate tectonic models
Geochronological, geochemical and isotopic study of detrital zircon suites from late Neoproterozoic clastic strata along the NE margin of the East European Craton : implications for plate tectonic models
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DOI：
10.1016/j.gr.2009.08.005
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发表时间：
2010-03
影响因子：
6.1
通讯作者：
N. Kuznetsov;L. Natapov;E. Belousova;S. Y. OReilly;W. Griffin
中科院分区：
文献类型：
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作者：
N. Kuznetsov;L. Natapov;E. Belousova;S. Y. OReilly;W. Griffin
利用LA-ICPMS研究东欧东缘新元古代硅质岩碎屑锆石U/Pb定年、稀土元素地球化学和Lu/Hf同位素（Djejim组砂岩，Djejim-Parma丘陵，Timan海岭南部，Engane-Pe组砂岩，北方Engane-Pe隆起，极地乌拉尔）被用来评估沉积物的来源，并测试晚前寒武纪大陆组装的构造模型。数据支持的结论，新元古代复合体的Timan-Pechora地区（TPR）主要是由沉积岩（SW Pre-Uralides-Timanides）侵蚀从波罗的海和沉积沿着被动边缘的波罗的海。然而，晚前寒武纪-早寒武纪火山-沉积岩和火山岩，花岗岩类，以及TPR（NE Pre-Uralides-Timanides）的稀有蛇绿岩包含更多的年轻物质，从波罗的海发展了一些距离。NE向Pre-Uralides-Timanides和冈瓦纳周边新元古代杂岩的锆石U/Pb年龄和Lu/Hf同位素体系存在重要差异，不支持NE向Pre-Uralides-Timanides的冈瓦纳周边起源。在我们的解释中，SW Pre-Uralides-Timanides沉积于新元古代沿着波罗的海的被动Timanian-Uralian边缘，但NE Pre-Uralides-Timanides形成沿着称为Arctida的古大陆的活动（Bolshezemel）边缘，并被捕获在两个古大陆，Arctida和波罗的海之间的碰撞带。
U/Pb dating, REE geochemistry and Lu/Hf isotopic studies utilizing LA-ICPMS on detrital zircon suites from Neoproterozoic siliciclastic rocks from the northeast periphery of the East European Craton (sandstones of Djejim Formation, Djejim-Parma Hills, Southern Timan Ridge and sandstones of the Engane-Pe Formation, Northern Engane-Pe uplift, Polar Urals) are used to assess the provenance of sediments and test tectonic models for the late Precambrian assembly of continents. The data support the conclusion that Neoproterozoic complexes of the Timan–Pechora region (TPR) are composed mainly of sedimentary rocks (SW Pre-Uralides–Timanides) eroded from Baltica and deposited along the passive margin of Baltica. However, late Precambrian–Early Cambrian volcanic-sedimentary and volcanic rocks, granitoids, and rare ophiolites of the TPR (NE Pre-Uralides–Timanides) comprise more juvenile material developed some distance from Baltica. Important differences exist between the U/Pb ages and Lu/Hf isotopic systematics of zircons from rocks of the NE Pre-Uralides–Timanides and the Neoproterozoic complexes of the Peri-Gondwanan terranes and do not support a Peri-Gondwanan origin for the NE Pre-Uralides–Timanides. In our interpretation, the SW Pre-Uralides–Timanides were deposited in the Neoproterozoic along the passive Timanian–Uralian margin of Baltica, but the NE Pre-Uralides–Timanides were formed along the active (Bolshezemel) margin of a paleocontinent called Arctida and were caught in the collision zone between the two paleocontinents, Arctida and Baltica.