Petrogenesis of the Chakabeishan pegmatites, North Qaidam Terrane: Implications for Indosinian lithium mineralization in the northern Tibetan Plateau
文献类型：期刊论文
| 作者 | Liu, Jin-Heng; Wang, Qiang; Wang, Bing-Zhang; Li, Wu -Fu; Xu, Chuan-Bing; Li, Shan -Ping; Wang, Zi-Long; Hao, Lu-Lu; Song, Tai-Zhong; Wang, Chun-Tao |
| 刊名 | LITHOS
 |
| 出版日期 | 2023 |
| 卷号 | 440页码:107025 |
| 关键词 | LI ISOTOPE FRACTIONATION RARE-METAL PEGMATITES KUNLUN OROGENIC BELT GRANITIC PEGMATITES TECTONIC EVOLUTION CONTINENTAL-CRUST SYSTEM MELTS AREA DISEQUILIBRIUM |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2023.107025 |
| 英文摘要 | Pegmatite-type Li deposit is a critical metal, which has been attracting extensive attention. However, its petrogenesis and Li-mineralization mechanism remain under debate. Recently, four types of Late Triassic (222-212 Ma) pegmatites are recognized in the Chakabeishan area of Markam-Yajiang-Karakoram (MYK) giant Li ore belt in northern Tibet: tourmaline-, garnet-. spodumene-, and lepidolite-bearing pegmatites. The tourmaline-bearing pegmatites show uniform Nd isotopic compositions (epsilon Nd(t) =-13.8 to-14.5), closed to those of the metasedimentary wall rocks (epsilon Nd(t) =-15.2 to-17.8), but significantly lower than those of the sur-rounding Middle Triassic (-244 Ma) syenogranites (epsilon Nd(t) =-4.7 to-5.5) that are typical I-type granites. These data, together with their higher Sm/Nd ratios, lower Y and LREE contents relative to the metasedimentary wall rocks, and lack of biotite, demonstrate that the tourmaline-bearing pegmatites were formed by the disequilibrium melting of the metasedimentary wall rocks involving water-absent muscovite dehydration melting with monazite in the residue. From the tourmaline-bearing pegmatites through the garnet-bearing pegmatites to the spodu- mene-and lepidolite-bearing pegmatites, gradually increasing whole-rock Li-Be contents as well as decreasing K/Rb ratios and increasing Cs contents in the K-feldspar and muscovite suggest that they were generated by continuous evolution of magmas similar to the tourmaline-bearing pegmatites. In addition, mineralogical observation and variable Nb and Ta contents in muscovite indicate that the Chakabeishan pegmatites experi-enced a three-stage evolution process, i.e., magmatic stage for tourmaline-and garnet-bearing pegmatites, coexisting aqueous and silicic magma to hydrothermal transition stage for spodumene-bearing pegmatites, and hydrothermal stage for lepidolite-bearing pegmatites. Taking into account regional geological constraints and our data, we suggest that the low-degree partial melting of clay-rich sedimentary rocks initially control the Li enrichment. The subsequent exsolution and accumulation of a fluid phase during magmatic evolution process occurred in the Li-poor and Li-rich pegmatites, respectively, which is responsible for the further Li mineralization. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000926454300001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80397]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Liu, Jin-Heng,Wang, Qiang,Wang, Bing-Zhang,et al. Petrogenesis of the Chakabeishan pegmatites, North Qaidam Terrane: Implications for Indosinian lithium mineralization in the northern Tibetan Plateau[J]. LITHOS,2023,440:107025. |
| APA | Liu, Jin-Heng.,Wang, Qiang.,Wang, Bing-Zhang.,Li, Wu -Fu.,Xu, Chuan-Bing.,...&Wang, Jin-Shou.(2023).Petrogenesis of the Chakabeishan pegmatites, North Qaidam Terrane: Implications for Indosinian lithium mineralization in the northern Tibetan Plateau.LITHOS,440,107025. |
| MLA | Liu, Jin-Heng,et al."Petrogenesis of the Chakabeishan pegmatites, North Qaidam Terrane: Implications for Indosinian lithium mineralization in the northern Tibetan Plateau".LITHOS 440(2023):107025. |
入库方式： OAI收割
来源：广州地球化学研究所
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。