| Geochronology and petrogenesis of Neoproterozoic S-type granites from the Qilian Block, north-west China, and their geological implications | |
Liu, Xiuting; Ren, Erfeng; Li, Binkai ; Du, Yongsheng; Gao, Donglin; Ren, Qianhui; Gao, Liang
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| 2019-07 | |
| 发表期刊 | GEOLOGICAL JOURNAL
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| ISSN | 0072-1050 |
| 卷号 | 54期号:4页码:2364-2381 |
| 摘要 | Early Neoproterozoic granites rarely outcrop in the Qilian Orogenic Belt (QOB) at the north-eastern margin of the Qinghai-Tibet Plateau; however, they are vital to understanding the Precambrian evolution of the QOB. Thus, we present an integrated study, comprising petrology, geochronology, and whole-rock geochemistry of two Early Neoproterozoic granitic plutons (Baihuagou and Yamacha plutons) in the eastern Qilian Block (QB). The results provide three key findings. First, their magma emplacement age is ca. 900 Ma (i.e., 918 Ma for Baihuagou and 910 Ma for Yamacha), and the two plutons have similar high-K calc-alkaline, strongly peraluminous characteristics, with slight enrichment in light rare earth elements; weak negative Eu anomalies; enrichment in large-ion lithophile elements (e.g., K, Th, Ba, and Rb); strong depletion in Ti; and weak depletion in Nb, Ta, and, Sr. These characteristics indicate that the granites from these plutons are S-type granites. Second, the two-mica granite and gneissic granite samples may have been formed by partial melting of ancient crustal material (mainly psammitic rocks), with contributions from a meta-igneous component, under high-temperature and low-pressure conditions. Third, new data from this study, combined with previously reported dates, indicate a continental margin arc setting for the QB during the Early Neoproterozoic (ca. 900 Ma). |
| DOI | 10.1002/gj.3301 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.isl.ac.cn/handle/363002/34025 |
| 专题 | 盐湖地质与环境实验室 中国科学院青海盐湖研究所 |
| 推荐引用方式 GB/T 7714 | Liu, Xiuting,Ren, Erfeng,Li, Binkai,et al. Geochronology and petrogenesis of Neoproterozoic S-type granites from the Qilian Block, north-west China, and their geological implications[J]. GEOLOGICAL JOURNAL,2019,54(4):2364-2381. |
| APA | Liu, Xiuting.,Ren, Erfeng.,Li, Binkai.,Du, Yongsheng.,Gao, Donglin.,...&Gao, Liang.(2019).Geochronology and petrogenesis of Neoproterozoic S-type granites from the Qilian Block, north-west China, and their geological implications.GEOLOGICAL JOURNAL,54(4),2364-2381. |
| MLA | Liu, Xiuting,et al."Geochronology and petrogenesis of Neoproterozoic S-type granites from the Qilian Block, north-west China, and their geological implications".GEOLOGICAL JOURNAL 54.4(2019):2364-2381. |
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