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| DOI | 10.1016/j.lithos.2023.107488 |
| Identical metamorphic record in distinct petrochemical systems: Case study of microscopically interlayered garnet amphibolite and metapelite from the Danba dome, SW China | |
| 发表日期 | 2024 |
| ISSN | 0024-4937 |
| EISSN | 1872-6143 |
| 起始页码 | 468 |
| 卷号 | 468 |
| 英文摘要 | It is known that different metamorphic rocks may have different abilities in recording metamorphic processes. Here, we report microscopically interlayered garnet amphibolite and metapelite layers in a rock from the Danba dome in eastern Tibetan Plateau, SW China. Both rock types exhibit similar garnet zoning patterns, biotite and plagioclase compositions, as well as peak P-T conditions (7.3-8.0 kbar / 700-725 C-degrees for metapelite and 7.1-8.4 kbar / 690-710 C-degrees for garnet amphibolite, respectively), indicating a global thermodynamic equilibrium state and the same metamorphic record of the two distinct layers. However, medium-sized garnet exhibits homogeneous core compositions and biotite preserves lower Ti and Fe# [= Fe2+ / (Fe2+ + Mg)] at the lithological interface, possibly indicating more intense chemical homogenization at the metamorphic peak and retrograde modification at the interface caused by the possible presence of vast fluid. Sensitive high -resolution ion microprobe (SHRIMP) U-Pb dating of metamorphic zircon show a wide dispersion of ages (c. 200-155 Ma), overlapping previous age data reported for this region. These results indicate that differences in petrochemical compositions may not lead to significant distortion in the metamorphic records, including garnet zoning patterns and peak P-T conditions. This further suggests that metamorphic rocks originating from diverse protoliths, which exhibit varying peak P-T conditions within the same locality, could either be a result of the tectonic juxtaposition of distinct tectonic slices or the influence of varying fluid conditions. |
| 英文关键词 | Amphibolite; Intercalation; Metamorphic record; Metapelite; Petrochemical system |
| 语种 | 英语 |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:001164978200001 |
| 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/301664 |
| 作者单位 | Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Carleton University |
| 推荐引用方式 GB/T 7714 | . Identical metamorphic record in distinct petrochemical systems: Case study of microscopically interlayered garnet amphibolite and metapelite from the Danba dome, SW China[J],2024,468. |
| APA | (2024).Identical metamorphic record in distinct petrochemical systems: Case study of microscopically interlayered garnet amphibolite and metapelite from the Danba dome, SW China.LITHOS,468. |
| MLA | "Identical metamorphic record in distinct petrochemical systems: Case study of microscopically interlayered garnet amphibolite and metapelite from the Danba dome, SW China".LITHOS 468(2024). |
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