2.1 similar to 1. 7 Ga geological event group and its geotectonic significance.
文献类型：期刊论文
| 作者 | Zhai, MG |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2004-11-01 |
| 卷号 | 20期号:6页码:1343-1354 |
| ISSN号 | 1000-0569 |
| 关键词 | North China craton 2. 1 similar to 1. 7 Ga orogenic event rifting event |
| 英文摘要 | Recently, the geological events and their significance during period of ca 2.1 similar to 1.7 Ga are attracted as an interesting study focus. Our study shows that a series of geological events occurred in the North China craton at that time do not belong to a simple orogenic or rifting tectonic process. These events could be divided into two event-subgroups, i.e. 2.1 similar to 1.9 Ga orogenic event-subgroup and 1.85 similar to 1.7 Ga rift event-subgroup. The major indications of the 2.1 similar to 1.9 Ga event-subgroup are listed below; (1) several mobile belts developed within the Neoarchean craton; (2) strong folded deformation and metamorphism of greenschist-epidote amphibolite facies; (3) magmatic intrusion of K-granite sills and Mafic dyke swarm. This event-subgroup is represented by the Jinyu and Liaohe mobile belts, and was possibly related to the Pre-Rodinia (Columbia) orogeny. This event-subgroup ended at ca 1.93 Ga. The 1.85 similar to 1.7 Ga event-subgroup is a rifting event. Its major indications are: (1) mantle upwelling and lower crust uplifting to the surface at whole, accompanied by strong migmatization and ductile deformation; (2) high-pressure granulites underwent moderate-pressure granulite-amphibolite facies overprint with 1820 similar to 1800 Ma and 1790 similar to 1760 Ma metamorphic ages and decompressional P-T path; (3) rifting event closely followed the basement uplifting, and the Xionger-Angou-Zhongtiao rift and Yanshan rift are of a same rift regime; (4) old mantle rapidly became richer at ca 1900 similar to 1760 Ma from a depleted composition. Therefore, we suggest that the similar to 1.8 Ga event-subgroup represents a continental geological process within craton; an upwelling mantle caused the craton basement uplifting at whole and closely followed by an aulacogen system. Our new study shows that mafic dykes can be, divided into two types.. metamorphosed and unmetamorphosed. The former has 2150 Ma forming age and 1970 similar to 1930 Ma (high-pressure granulite facies) and 1830 Ma (granulite facies) metamorphic ages. The later has 1780 similar to 1750 Ma forming age which is similar to that of amphibolite facies overprint of the metamorphosed dykes. The unmetamorphosed dykes obviously intruded after the craton basement uplifting. |
| 语种 | 英语 |
| 出版者 | SCIENCE CHINA PRESS |
| WOS记录号 | WOS:000226179100004 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79563]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhai, MG |
| 作者单位 | Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhai, MG. 2.1 similar to 1. 7 Ga geological event group and its geotectonic significance.[J]. ACTA PETROLOGICA SINICA,2004,20(6):1343-1354. |
| APA | Zhai, MG.(2004).2.1 similar to 1. 7 Ga geological event group and its geotectonic significance..ACTA PETROLOGICA SINICA,20(6),1343-1354. |
| MLA | Zhai, MG."2.1 similar to 1. 7 Ga geological event group and its geotectonic significance.".ACTA PETROLOGICA SINICA 20.6(2004):1343-1354. |
入库方式： OAI收割
来源：地质与地球物理研究所
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