Genetic significance of Triassic alkali-rich intrusive rocks in the Yinshan and neighboring areas
文献类型：期刊论文
| 作者 | Tang YanJie1; Zhang HongFu1,2; Ying JiFeng2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2014-07-01 |
| 卷号 | 30期号:7页码:2031-2040 |
| 关键词 | Alkali-rich intrusive Petrogenesis Yinshan Triassic Paleo-Asian Ocean North China Craton |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | Alkali-rich intrusive rocks mainly include alkaline rocks and alkaline granites as well as alkali-feldspar granites. The total alkali contents of these rocks are generally more than 8%. Alkaline rocks mainly include syenite, nepheline syenite, pyroxene syenite, aegirine-augite syenite and amphibole syenite. The most striking feature of their chemical composition is relatively poor in silica, but rich in aluminum and total alkali. Alkaline granites refer to the alkaline amphibole and alkaline pyroxene-bearing granites. They are relatively rich in silica and total alkali but poor in aluminum. Alkali-rich intrusive only account for a very small proportion of total intrusive rocks. Their outcrop area approximately occupies 2% of the total area of all kinds of intrusive rocks. However, alkalirich intrusive rocks have very important mineral and geological significance. As a result, the investigations of alkali-rich intrusive rocks not only are of important significance to reveal the characteristics of lithospheric mantle, the processes of crust-mantle interaction and their associated geodynamic background, but also can provide scientific basis for the research of lithospheric evolution, mineral exploration and resource evaluation. Based on the comprehensive summary of available information, there are lots of Triassic alkali-rich intrusions occurred in the Yanshan-Liaoning-Yinshan regions in the northern margin of the North China Craton. These alkali-rich intrusions start at the Baotou City in the Inner Mongolia in the west and end at the central part of Jilin Province and even the north part of North Korea in the east. They are generally located between north latitude 40 and north latitude 42 with width of about 100km and constitute a nearly east-west-direction and 1500-kilometer-long alkaline rock belt. The Triassic alkali-rich intrusive rocks in the Yinshan and its neighboring areas are mainly located in the territories of Baotou, Liangcheng, Siziwangqi, Chahar Right Back Banner and Chahar Right Middle Banner cities in the Inner Mongolia. The adjacent alkaline intrusive rocks to the east mainly occurred in the regions of the Tianzhen City in the Shanxi Province, Yangyuan and Fanshan cities in the Hebei Province. Base on early published data of whole-rock and mineral Rb-Sr isochron ages, these alkali-rich intrusions formed during 268 190Ma ( these data have large errors of about 5 11Ma). Compared to those in the Siziwangqi and Chahar regions, the Liangcheng and Baotou alkali-rich intrusions are relatively younger ( about 197 190Ma). The geochemical compositions of these alkali-rich intrusive rocks are highly variable, with SiO, contents ranging from 35% to 70%. In contrast, the syenites in the Siziwangqi and Chahar areas have higher contents of SiO, and A1,03, but lower contents of TiO,, Fe203 and MgO than those in other areas, which possibly reflect that these intrusive rocks are the products of higher-degree partial melting of mantle source and greater degree of fractional crystallization of pyroxene, olivine and amphibole. It should be noted that most of the syenites are very low in MgO contents, which are plotted in the field for the melt derived from plate in the experiments of 1 4GPa. Some of them have relatively high MgO contents and Me values and drop in the field for the adakites generated by the melting of oceanic slab. These signatures suggest that the formation of those alkali-rich intrusive rocks could be related to the melting of recycled subducted slab. |
| WOS关键词 | NORTH CHINA CRATON ; ULTRAMAFITE-SYENITE COMPLEX ; HEBEI PROVINCE ; ISOTOPIC CHARACTERISTICS ; MANTLE INTERACTION ; SR ; ND ; GEOCHEMISTRY ; BENEATH ; XENOLITHS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000339456100016 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/84812]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Tang YanJie |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang YanJie,Zhang HongFu,Ying JiFeng. Genetic significance of Triassic alkali-rich intrusive rocks in the Yinshan and neighboring areas[J]. ACTA PETROLOGICA SINICA,2014,30(7):2031-2040. |
| APA | Tang YanJie,Zhang HongFu,&Ying JiFeng.(2014).Genetic significance of Triassic alkali-rich intrusive rocks in the Yinshan and neighboring areas.ACTA PETROLOGICA SINICA,30(7),2031-2040. |
| MLA | Tang YanJie,et al."Genetic significance of Triassic alkali-rich intrusive rocks in the Yinshan and neighboring areas".ACTA PETROLOGICA SINICA 30.7(2014):2031-2040. |
入库方式： OAI收割
来源：地质与地球物理研究所
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