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首页> 外文期刊>Journal of Asian earth sciences >Reappraisal of ages of Triassic continental sedimentary successions in the Yanbian area (NE China): Implications for the Triassic Angaran and Cathaysian floral recovery
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Reappraisal of ages of Triassic continental sedimentary successions in the Yanbian area (NE China): Implications for the Triassic Angaran and Cathaysian floral recovery

机译：延边地区三叠纪大陆沉积演替衰退（NE中国）的重新评估：三叠纪安加伦和国防植物的影响

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摘要

In the Yanbian area, northeastern China, Late Paleozoic sedimentary successions are well developed and contain both Angaran and Cathaysian-derived floras. The flora-bearing successions were originally thought to be Permian in age and these flora fossils disappeared after the Permo-Triassic mass extinction (PTME). The Jiefangcun Formation was thus assigned a Permian age. In this study, the weighted mean 206Pb/238U ages of the youngest zircons from two samples from the Jiefangcun Formation are 246.8 +/- 2 Ma (MSWD = 0.65, n = 11) and 247.2 +/- 3 Ma (MSWD = 0.15, n = 7). One dacite above this formation is dated to 241 +/- 16 Ma (MSWD = 2.6, n = 3). Therefore, the Jiefangcun Formation was deposited during the Middle Triassic (247-241 Ma). This result further suggested that the Angaran and Cathaysian floras did not disappear after the PTME and recovered in the Middle Triassic. Moreover, the chemical index of alteration, index of compositional variability, and plagioclase index of alteration values suggest that the sediments of the Jiefangcun Formation were derived from an intermediate-felsic igneous source with a weak degree of weathering and simple sedimentary recycling history. The Rb/K, Sr/Ba, V/Ni and Sr/Cu values indicate that this formation was deposited in micro-saline water in an arid climate. Detrital zircon ages from the North China Craton and Jiamusi-Mongolia block in this formation suggest that the proximal provenance was bidirectional. The Paleo-Asian Ocean was therefore finally closed during the Middle Triassic with the witness of floral recovery in the Yanbian area.
机译：在中国东北地区延边地区，已故古生代沉积演员的开发良好，含有安巴兰语和安娜派生的植物群。菌群成交的继承最初被认为是白年龄段，这些植物群化石在渗透 - 三叠纪灭绝（PTME）后消失了。因此，解放村的形成被分配了一个二叠纪时代。在这项研究中，来自解放春季形成的两个样品的重量平均206pb / 238u时代最小的锆石是246.8 +/- 2 ma（mswd = 0.65，n = 11）和247.2 +/- 3 ma（mswd = 0.15， n = 7）。高于该形成的粘液型为241 +/- 16 mA（Mswd = 2.6，n = 3）。因此，在中间三叠系（247-241 mA）期间沉积了解放性的组成。这结果进一步表明，昂巴兰和国土群落在PTME之后并没有消失并在中间三叠系中恢复。此外，改变的化学指标，组成可变性指数和改变值的普发基酶指标表明，解放春季地层的沉积物源自中间铰接性火射源，具有薄弱程度的风化和简单的沉积回收历史。 RB / K，SR / BA，V / Ni和Sr / Cu值表明该形成沉积在干旱的气候中的微生物水中。此形成中，华北克拉顿和佳木斯蒙古块的替代锆石年代议案表明，近端的出处是双向的。因此，古亚洲海洋最终在中间地区的花卉复苏的见证期间关闭。

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  • 来源
    《Journal of Asian earth sciences》 |2021年第1期|104811.1-104811.18|共18页
  • 作者

    Du Qingxiang; Li Guangsu; Han Zuozhen; Shen Xiaoli;

  • 作者单位

    Shandong Univ Sci & Technol Coll Earth Sci & Engn Key Lab Deposit Mineralizat & Sedimentary Mineral Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Earth Sci & Engn Key Lab Deposit Mineralizat & Sedimentary Mineral Qingdao 266590 Peoples R China;

    Shandong Univ Sci & Technol Coll Earth Sci & Engn Key Lab Deposit Mineralizat & Sedimentary Mineral Qingdao 266590 Peoples R China|Qingdao Natl Lab Marine Sci & Technol Lab Marine Mineral Resources Qingdao 266237 Peoples R China;

    Shandong Univ Sci & Technol Coll Earth Sci & Engn Key Lab Deposit Mineralizat & Sedimentary Mineral Qingdao 266590 Peoples R China;

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  • 关键词

    Geochronology; Geochemistry; Floral recovery; Angaran and Cathaysian floras; Mass extinction; Yanbian area;

    机译：地理学;地球化学;花卉恢复;Angaran和Cathaysian Floras;群众灭绝;延边地区;

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