Timing and setting of Guanjiagou conglomerate in South Qinling and their tectonic implications
文献类型：期刊论文
| 作者 | Yan, QR; Hanson, AD; Wang, ZQ; Druschke, PA; Yan, Z; Wang, T; Lu, HF |
| 刊名 | CHINESE SCIENCE BULLETIN
 |
| 出版日期 | 2004-08-01 |
| 卷号 | 49期号:16页码:1722-1729 |
| 关键词 | South Qinling Mountains Guanjiagou Formation Ar-40/ar-39 Dating Remnant Ocean Basin Anyemaqen-mianlue Ocean |
| ISSN号 | 1001-6538 |
| DOI | 10.1360/03wc0160 |
| 文献子类 | Article |
| 英文摘要 | Located in the southern Qinling Mountains of central China, the Guanjiagou Formation has been a controversial issue with regard to its depositional age and tectonic implications. Being comprised of an approximately 2050 m thick succession of texturally and compositionally immature, presumed marine turbiditic sandstones and conglomerate, the Guanjiagou Formation consists of an overall prograding- and coarsening-upward megasequence. Although bounded by faults on both its northern and southern margins, it is weakly metamorphosed and deformed. To the north is the Devonian Sanhekou Group and to the south is the Neoproterozoic Hengdan Group. The lower portion of the sequence contains granitic and volcanic clasts (Guanjiagou conglomerate). The feldspars from these clasts were dated using the Ar-40/Ar-39 method. Two cooling ages of 219.69 +/- 0.49 and 216.46 +/- 0.59 Ma, for K-feldspar from a granitic clast and plagioclase from a volcanic clast, respectively, were obtained. These ages are identical to the time of regional igneous activities (ca. 240-220 Ma) and are interpreted as the products of magmatism associated with collision in the Qinling orogenic belt in the Early Mesozoic, suggesting that the Guanjiagou Formation was deposited in the Norian of the Late Triassic, ca. 220 Ma. Therefore, Ar-40/Ar-39 and sedimentary analyses suggest that the Guanjiagou Formation contains sediments that may have filled in a remnant ocean basin, which might be part of the Anyemaqen-Mianlue ocean, or Tethys on the southern side of Central Orogenic Belt in China during the Late Paleozoic to Early Mesozoic. |
| WOS关键词 | CHINA |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| WOS记录号 | WOS:000224549400010 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/64680]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yan, QR |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan, QR,Hanson, AD,Wang, ZQ,et al. Timing and setting of Guanjiagou conglomerate in South Qinling and their tectonic implications[J]. CHINESE SCIENCE BULLETIN,2004,49(16):1722-1729. |
| APA | Yan, QR.,Hanson, AD.,Wang, ZQ.,Druschke, PA.,Yan, Z.,...&Lu, HF.(2004).Timing and setting of Guanjiagou conglomerate in South Qinling and their tectonic implications.CHINESE SCIENCE BULLETIN,49(16),1722-1729. |
| MLA | Yan, QR,et al."Timing and setting of Guanjiagou conglomerate in South Qinling and their tectonic implications".CHINESE SCIENCE BULLETIN 49.16(2004):1722-1729. |
入库方式： OAI收割
来源：地质与地球物理研究所
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