Age of the Early Devonian Kangbutiebao Formation along the southern Altay Mountains and its northeastern extension.
文献类型：期刊论文
| 作者 | Liu Wei1; Liu LiJuan1; Liu XiuJin1; Shang HaiJun2; Zhou Gang2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2010-02-01 |
| 卷号 | 26期号:2页码:387-400 |
| 关键词 | Sims Zircon U-pb Age Kangbutiebao Formation Maizi Volcanic-sedimentary Basin Magmatic Arc Precambrian |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Such problems remain unsolved that include age of the Kangbutiebao Formation within the Maim volcanic-sedimentary basin and Its eastern boundary, northeastern extension, source rock and tectonic setting of the Early Devonian volcanic rocks along the southern Altay Mountains. The Sawusi Ph-Zn ore deposit, newly discovered to the east of the Maim basin as known to the present, occurs within volcanics of the Kangbutiebao Formation and spatially closely related to the Biesisala porphyrite This study performed SIMS zircon U-Pb dating of rhyolite from the Kangbutiebao Formation and Biesisala porphyrite, Sawusi deposit, and analyzed major and trace element compositions of these rocks, in an attempt to solve the above problems Eighteen analyses on 18 zircon grams from the rhyolite yielded identical concordant age and weighted mean age of 401 Ma, whereas 15 analyses on 15 zircons from a granodiorite porphyrite yielded identical concordant age and weighted mean age of 401 Ma. Therefore, rhyolite of the Kangbutiebao Formation and the Biesisala porphyrite, Sawusi, are coeval, age of the Kangbutiebao Formation is Early Devonian instead of Late Silurian to Early Devonian, and the Maim volcanic-sedimentary basin is extended as further east to the western side of the Kalaxiangar fault. At 400 Ma. extensive acidic volcanic eruption occurred concurrently with widespread granite plutonism within the Chinese Allay mountains Both of them collectively constitute the magmatic arc on the southern Allay continental margin However, unlike granites that occur throughout the Allay mountains, the Early Devonian volcanics focus on the southern Altay mountains as controlled by faults. Some zircons from the granodiorite porphyrite yielded ages of 513 8Ma and 3134Ma. These results suggest that basement of. the southern Altay mountains consists mainly of Cambrian to Ordovician rocks, with presence of Precambrian micro-continent Diagrams SiO(2)-alkalies SiO(2)-K(2)O, log tau-log sigma, SiO(2)-FeO/(FeO + MgO), and tectonic discrimination diagrams demonstrate that rhyolite, tuff, and quartz diorite-granodiorite porphyrite from the Sawusi, and volcanics of the Kangbutiebao Formation within the southern Altay mountains were formed in an active continental margin or island arc setting. While keratophyre of the middle-lower section of the Kangbutiebao Formation was erupted Oil the ocean island setting. rhyolite of the upper section erupted in the continental margin Primitive mantle-normalized multi-element diagrams show that the three types of igneous rocks in the Sawusi have pronounced Nb, Ta, Ti and Si, P, Ba anomalies, and are markedly enriched in Th, U, K, La, Ce, Pr, Zr and Hf. Based on the above features and zircon U-Pb ages, authors consider that source materials of the igneous rocks in the Sawusi deposit are dominantly Cambrian to Ordovician island are rocks with various amounts of Precambrian micro-continental rocks The three volcanic-sedimentary has Chonghuer, Kelan and Maim, show systematic variations from the west to the east in such aspects as tectonic affiliation, proportions of continental basement, petrology and geochemistry of volcanic rocks, and proportions of volcanic to sedimentary rocks These variations largely determine the variation metallogenetic element associations of sulfide and iron ore deposits along the southern Altay mountains. |
| WOS关键词 | PHANEROZOIC CRUSTAL GROWTH ; ND ISOTOPIC EVIDENCE ; TRACE-ELEMENT ; U-PB ; TECTONIC EVOLUTION ; CHINESE ALTAI ; CENTRAL-ASIA ; ACCRETIONARY OROGENESIS ; CONTINENTAL-CRUST ; NORTHERN XINJIANG |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000275734400003 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/73204]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu Wei |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Xinjiang Bur Geol & Mineral Explorat & Dev, Altay 836500, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu Wei,Liu LiJuan,Liu XiuJin,et al. Age of the Early Devonian Kangbutiebao Formation along the southern Altay Mountains and its northeastern extension.[J]. ACTA PETROLOGICA SINICA,2010,26(2):387-400. |
| APA | Liu Wei,Liu LiJuan,Liu XiuJin,Shang HaiJun,&Zhou Gang.(2010).Age of the Early Devonian Kangbutiebao Formation along the southern Altay Mountains and its northeastern extension..ACTA PETROLOGICA SINICA,26(2),387-400. |
| MLA | Liu Wei,et al."Age of the Early Devonian Kangbutiebao Formation along the southern Altay Mountains and its northeastern extension.".ACTA PETROLOGICA SINICA 26.2(2010):387-400. |
入库方式： OAI收割
来源：地质与地球物理研究所
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