Late Paleoproterozoic to Neoproterozoic Geological Events of the North China Craton: Evidences from LA-ICP-MS U-Pb Geochronology of Detrital Zircons from the Cambrian and Jurassic Sedimentary Rocks in Western Hills of Beijing
详细信息
- 责任者：Hu Bo (Key Laboratory of Western Mineral Resources and Geological Engineering ; Ministry of Education ; College of Earth Sciences and Resources ; Chang’an University ; Xi’an 710054 ; China) ; Zhai Mingguo
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(7)
- 关键词：元古宙 ; Proterozoic ; 铀—铅计时 ; U-Pb dating ; 地质事件 ; geological event ; 华北地区 ; North China
- 页码：p.2508-2536
- 图表：9 illus., 3 tables, 116 refs.
- 分类号：1200
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Whether any age records about the assemblage and rifting of the Rodinia supercontinent are preserved in the North China Craton ( NCC) like in the South China Craton ( SCC) is a key issue to understand the Proterozoic tectonic evolution of the NCC. This study focuses on LA-ICP-MS U-Pb dating of detrital zircons from the Cambrian and Jurassic clastic rocks in Western Hills of Beijing to reveal significant Precambrian,especially Late Paleoproterozoic to Neoproterozoic geological events of the NCC. U-Pb age data of detrital zircons show that age peaks of the detrital zircon grains of the calcareous fine sandstone from the Cambrian Xuzhuang Formation focus on ～ 1. 38Ga and ～ 1. 14Ga. There are also ～ 1. 56Ga,～ 912Ma,～ 814Ma,～ 740Ma,～ 630Ma and ～ 507Ma age groups in this sandstone. The age peaks of the detrital zircon grains of the feldspar lithic fine sandstone and the silty mudstone from the Jurrasic Yaopo Formation focus on ～ 2. 5Ga,1. 88 ～ 1. 8Ga, ～ 1. 74Ga, ～ 1. 6Ga and 186Ma. Besides,there are ～ 2. 77Ga, ～ 2. 0Ga, ～ 1. 2Ga,～ 488Ma, ～ 256Ma and ～ 233Ma age groups. All the three rocks have low compositional and textural maturity,which indicates nearer provenances. So the detrital material of the three rocks may mainly derive from the interior and the north margin of the NCC,that means,the age groups of the detrital zircons may record significant Precambrian geological events of the NCC. Detrital zircon ages of ～ 2. 77Ga, ～ 2. 5Ga,2. 1 ～ 2. 0Ga and 1. 88 ～ 1. 8Ga correspond respectively to Precambrian significant events of crustal growth,cratonization,rifting and orogenesis in the NCC; Detrital zircon ages of ～ 1. 74Ga,～ 1. 6Ga,～ 1. 56Ga,～ 1. 38Ga, ～ 912Ma and ～ 814Ma record Late Paleoproterozoic to Neoproterozoic multi rifting events developing after the final cratonization at about 1. 8Ga of the NCC. Magmatic and metamorphic rocks corresponding to 1. 3 ～ 1. 0Ga,～ 740Ma and ～ 630Ma detrial zircon ages seldom crop out in the NCC,whereas develop broadly in the SCC and may correlate to various stages of assemblage and rifting of the Rodinia supercontinent. Age records of Late Paleoproterozoic to Neoproterozoic geological events of the NCC preserved in detrital zircons from the Phanerozoic clastic rocks in the NCC may provide significant evidences to discuss the geological evolution of the NCC in the Proterozoic and the relationship of the NCC and the SCC.
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