The generations and U-Pb dating of baddeleyites from the Taihang dyke swarm in North China and their implications for magmatic evolution
文献类型：期刊论文
| 作者 | Wang Chong1,2; Peng Peng1; Wang XinPing1,2; Li QiuLi1; Xu XiYang1,2; Yang ShuYan1,2 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2016-03-01 |
| 卷号 | 32期号:3页码:646-658 |
| 关键词 | North China Craton Paleoproterozoic Taihang dyke swarms Baddeleyite U-Pb dating Magmatic evolution |
| 文献子类 | Article |
| 英文摘要 | It's an effective way to determine the ages of mafic dykes by the U-Pb isotopes of baddeleyites in them. Although a bunch of ages had been reported for the high-differentiated Taihang dykes (generally TiO2 > 1% and MgO < 6%), there is no precise dating for the low-differentiated ones (TiO2 similar to 1% and MgO > 6%). The age relationship of the two groups of dykes is important in constraining their petrogenetic correlations. In this study, we analyze baddeleyite Pb-207/Pb-206 ages of the low-differentiated and high differentiated dykes from the Fengzhen area using SIMS method. The results show that the low-differentiated Chedaogou dyke crystallized at 1768 +/- 4Ma (n = 9, MSWD = 2.1); whereas the age of high-differentiated Suanciwan dyke has two distinct age groups, one at 1780 +/- 3Ma (n = 8, MSWD = 0.65) and the other at 1760 +/- 3Ma (n = 5, MSWD = 1.7). Two groups of baddeleyites from the Suanciwan dyke have some differences in composition, e.g., the baddeleyites of similar to 1760Ma group are richer in Ti and have narrower Zr/Hf ratio range than the similar to 1780Ma ones. This may indicate that the baddeleyites were crystallized at different magmatic stages: the older one (similar to 1780Ma) probably crystallized in the magma chamber with more primitive compositions; whereas the younger one (similar to 1760Ma) could be formed in the conduit with more evolved compositions during the ascent and differentiation of the dyke or also in magma chamber at later stages. The negative correlations between ages and Zr/Hf may be due to the fractional crystallization of clinopyroxene. All the reported ages of the Taihang dyke swarm are between 1785Ma and 1760Ma. Our study suggests that the magma of the Taihang dyke swarm may have existed for similar to 20Myr, i.e., it formed at similar to 1785Ma, and emplaced during 1785 similar to 1760Ma. |
| WOS关键词 | TI-IN-ZIRCON ; MAFIC DYKES ; SUPERCONTINENT COLUMBIA ; SOUTHERN MARGIN ; SOLOMON-ISLANDS ; MANTLE SOURCE ; HIGH-PRESSURE ; CRATON ; PETROGENESIS ; GA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000374429500002 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53482]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang Chong,Peng Peng,Wang XinPing,et al. The generations and U-Pb dating of baddeleyites from the Taihang dyke swarm in North China and their implications for magmatic evolution[J]. ACTA PETROLOGICA SINICA,2016,32(3):646-658. |
| APA | Wang Chong,Peng Peng,Wang XinPing,Li QiuLi,Xu XiYang,&Yang ShuYan.(2016).The generations and U-Pb dating of baddeleyites from the Taihang dyke swarm in North China and their implications for magmatic evolution.ACTA PETROLOGICA SINICA,32(3),646-658. |
| MLA | Wang Chong,et al."The generations and U-Pb dating of baddeleyites from the Taihang dyke swarm in North China and their implications for magmatic evolution".ACTA PETROLOGICA SINICA 32.3(2016):646-658. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。