Detrital zircon U-Pb and Hf isotopic and whole-rock geochemical study of the Bayan Obo Group, northern margin of the North China Craton: Implications for Rodinia reconstruction
Detrital zircon U-Pb and Hf isotopic and whole-rock geochemical study of the Bayan Obo Group, northern margin of the North China Craton: Implications for Rodinia reconstruction
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华北克拉通北缘白云鄂博群碎屑锆石U-Pb、Hf同位素及全岩地球化学研究：对Rodinia重建的启示
DOI：
10.1016/j.precamres.2017.04.033
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发表时间：
2017-12
影响因子：
3.8
通讯作者：
Shi Jianrong
中科院分区：
文献类型：
--
作者：
Liu Chaohui;Zhao Guochun;Liu Fulai;Shi Jianrong
位于华北陆缘北方的扎尔台-巴彦敖包-化德裂谷带，其上地壳序列自西向东分为狼山群、扎尔台群、巴彦敖包群和化德群。巴彦鄂博群不整合于晚新太古代-古元古代基底岩石之上，并被两个显著的不整合面划分为三个层序。根据最年轻的碎屑锆石和晚期侵入体的年龄，可将下、中、上层序的沉积年龄分别限定在1.81- 1.65Ga、1.56- 1.35Ga和1.19- 0.92Ga。变质沉积样品的地球化学特征表明，它们大多直接来源于中长英质岩浆岩和变质岩，只有中系列的哈拉霍格特样品具有改造特征。碎屑锆石U-Pb年龄峰值分别为2.52- 2.48Ga、1.95- 1.85Ga、1.74- 1.61Ga、1.55- 1.53Ga、1.37- 1.34Ga和1.18- 1.13Ga。新太古代晚期至古元古代中期的碎屑锆石记录在低、中层序中，并来自于约。2.5阴山地块的尕古阳、西乌兰不浪地区和约1.9尕哈拉沁、凉城地区。晚古元古代比鲁特组中的低εHf（t）碎屑锆石可能来源于北方华北克拉通同时代的裂谷花岗岩和火山岩。另一方面，北克拉通北方和东南缘中元古代晚期至新元古代早期沉积单元的碎屑锆石年龄模式与芬诺斯堪地盾西部和北方边缘的碎屑锆石年龄模式相似。结合最近的古地磁和地质资料，我们推断，NCC和波罗的海没有分离，直到0.89 Ga在Rodinia超大陆。
The Zha’ertai-Bayan Obo-Huade rift zone is located in the northern margin of the North China Craton (NCC), where rift-related supracrustal successions are divided into the Langshan, Zha’ertai, Bayan Obo and Huade groups from west to east. The Bayan Obo Group unconformably overlies the Late Neoarchean to Paleoproterozoic basement rocks and has been subdivided into three successions by two prominent unconformities. Depositional ages of the lower, middle and upper succession can be constrained in the period of 1.81–1.65 Ga, 1.56–1.35 Ga and 1.19–0.92 Ga respectively based on ages of the youngest detrital zircons and latter intrusions. Geochemistry of the meta-sedimentary samples suggest that most of them were directly sourced from intermediate to felsic magmatic and metamorphic rocks and only the Halahuogete samples from the middle succession display reworking features. U-Pb ages of detrital zircons from the group yielded age peaks of 2.52–2.48 Ga, 1.95–1.85 Ga, 1.74–1.61 Ga, 1.55–1.53 Ga, 1.37–1.34 Ga and 1.18–1.13 Ga. The late Neoarchean to middle Paleoproterozoic detrital zircons are documented in the lower and middle successions and are derived from the ca. 2.5 Ga Guyang and Xi Ulanbulang areas and ca.1.9 Ga Halaqin and Liangcheng areas in the Yinshan Block. The late Paleoproterozoic detrital zircons with lowεHf(t) values from the Bilute Formation are interpreted to be sourced from the coeval rift-related granitic plutons and volcanic rocks in the northern NCC. On the other way, detrital zircon age patterns of the late Mesoproterozoic to early Neoproterozoic sedimentary units at the northern and southeastern margins of the NCC are similar with those from the western and northern margin of the Fennoscandian shield. Combined with recent paleomagnetic and geological data, we infer that the NCC and Baltica have not separated until 0.89 Ga in the Rodinia supercontinent.
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