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| DOI | 10.1016/j.lithos.2024.107556 |
| Genesis and metallogenic potential of the ca.90 Ma Jiangcisha magmatic rocks in the western Shiquanhe suture zone, Xizang, China | |
| 发表日期 | 2024 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 起始页码 | 472 |
| 卷号 | 472 |
| 英文摘要 | Numerous mineral deposits related to the ca.90 Ma magmatic activity were found in the northern and central Lhasa terrane. Recently, many Late Cretaceous intermediate and felsic magmatic rocks were discovered in the Jiangcisha area in the western Shiquanhe-Nam Tso Me ' lange Zone, separating the Lhasa terrane into northern and central subterranes. In this study, zircon U-Pb dating, whole -rock major and trace element geochemistry, zircon Hf isotopes and trace element compositions are used to determine the petrogenesis and mineralization potential of the Jiangcisha intermediate and felsic magmatic rocks. The zircon U-Pb ages of the diorite porphyry, dacite porphyry, and diorite sample are 92.2 +/- 1.6 Ma, 90.0 +/- 1.3 Ma, and 85.8 +/- 1.7 Ma, respectively. The diorite porphyry and diorite samples have A/CNK values ranging from 0.65 to 0.91 and show elevated Mg# (44.78-53.11), Cr (108-338 ppm) and Ni (53.2-119 ppm) concentrations. These rocks also have high Sr/Y values (30.37-58.03) and low Rb/Sr ratios (0.04-0.33), with weak negative Eu anomalies (delta Eu = 0.75-0.95). Based on these values, these samples are high -Mg# calc-alkaline and metaluminous adakitic rocks. The dacite porphyry has a high SiO2 content (73.54-74.07 wt%) and significant negative Eu (delta Eu = 0.69-0.73) and Sr anomalies. Their Sr contents are 10 times lower than those of the diorite porphyry and diorite samples. The zircon epsilon Hf(t) values of these three magmatic rocks are high (7.61-12.69), and the Hf isotope two -stage model ages are young (0.41-0.78 Ga). The geochemical characteristics mentioned above indicate that the diorite porphyry and diorite were derived from the partial melting of the delaminated juvenile lower crust. However, the dacite porphyry is the product of plagioclase and K -feldspar fractional crystallization from the diorite porphyry. The zircons in the diorite porphyry and diorite samples have low Ce/Nd (3.66-29.04), logfO2 (- 16.022--12.976), and Delta FMQ (0.08-1.99) values and moderate Dy/Yb (0.22-0.37), 10,000 x delta Eu/Y (1.48-9.66), and (Ce/Nd)/Y (0.0025-0.0224) ratios. Compared to typical large porphyry-skarn Cu-Au deposits with dioritic rocks developed in the Tibetan Plateau, the relatively low oxygen fugacity and magma water content of the Jiangcisha dioritic rocks indicate their limited potential to form large porphyry and skarn Cu-Au deposits. |
| 英文关键词 | Late Cretaceous; Adakitic rocks; Mineralization potential; Jiangcisha; Shiquanhe suture zone |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001202046700001 |
| 来源期刊 | LITHOS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/306473 |
| 作者单位 | China University of Petroleum |
| 推荐引用方式 GB/T 7714 | . Genesis and metallogenic potential of the ca.90 Ma Jiangcisha magmatic rocks in the western Shiquanhe suture zone, Xizang, China[J],2024,472. |
| APA | (2024).Genesis and metallogenic potential of the ca.90 Ma Jiangcisha magmatic rocks in the western Shiquanhe suture zone, Xizang, China.LITHOS,472. |
| MLA | "Genesis and metallogenic potential of the ca.90 Ma Jiangcisha magmatic rocks in the western Shiquanhe suture zone, Xizang, China".LITHOS 472(2024). |
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