Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1007/s12517-020-05706-y |
| Elemental substitutions and compositional evolution during tourmaline formation in metasomatic schistose rocks of Sikait area in the Southern Eastern Desert, Egypt | |
| Harraz, Hassan; Abd El Monsef, Mohamed | |
| 通讯作者 | Abd El Monsef, M (corresponding author), Tanta Univ, Fac Sci, Dept Geol, Tanta 31527, Egypt. |
| 会议名称 | 2nd Conference of the Arabian-Journal-of-Geosciences (CAJG) |
| 会议日期 | NOV 25-28, 2019 |
| 会议地点 | Sousse, TUNISIA |
| 英文摘要 | Tourmaline deposit in Sikait area (Southern Eastern Desert of Egypt [SEDE]) is closely associated with metapelitic schistose rocks that belong to Neoproterozoic time. The distribution of tourmaline was mostly controlled by Nugrus shearing, along with schist leucocratic rock varieties (leucogranite, pegmatite, and aplite dikes), which are syntectonically dissected by hydrothermal quartz veins. Local concentrations of tourmaline occur either as discontinuous tourmalinite bands/pockets or as disseminated isolated clusters of crystals within the metapelitic schistose rocks, pegmatites, and quartz veins. Chemical and mineralogical changes accompanying with tourmaline formation have been observed within the schistose rocks in contact with a pegmatitic bodies in Sikait area. Four mineral assemblages were identified on approaching to the pegmatite contact: (1) Quartz-Biotite-Potassium Feldspar-Chlorite assemblage (Q-B-K-C); (2) Quartz-Biotite-Tourmaline-Chlorite assemblage (Q-B-T-C); (3) Tourmaline-Quartz-Muscovite assemblage (T-Q-M); and (4) Tourmaline-Quartz assemblage (T-Q). Toward the pegmatite contact, K, Li, Rb, SiO2, CaO, MgO, Sr, and Ba are decreased, while Al2O3, B2O3, Na2O, Fe (tot), Zr, Y, and Th are moderately increased. Variations in the mineral assemblages and whole-rock chemistry within the four alteration zones appear to be controlled by boron metasomatism and potash leaching. The normalized rare earth element patterns of rock samples from the four alteration zones suggest a partial alteration of the original sedimentary patterns by the metasomatic-magmatic fluids. The alteration could be either a single phase of interactions between pegmatite fluid and schists with B-, Li-, Rb-carrying fluid or a couple of phases (B-, Mn-, Be-rich fluid and Rb-, Li-, K-rich fluid). In all cases, boron from the pegmatite-associated fluids reacts with the surrounding schistose rocks to breakdown of sheet silicate which acts as traps for Rb, Sr, Li, Ba, and K and hence leads to tourmaline-rich assemblages. |
| 英文关键词 | Boron metasomatism Tourmaline Compositional evolution Substitutions Metapelitic schist Sikait Egypt |
| 来源出版物 | ARABIAN JOURNAL OF GEOSCIENCES |
| ISSN | 1866-7511 |
| EISSN | 1866-7538 |
| 出版年 | 2020 |
| 卷号 | 13 |
| 期号 | 15 |
| 出版者 | SPRINGER HEIDELBERG |
| 类型 | Article; Proceedings Paper |
| 语种 | 英语 |
| 收录类别 | CPCI-S |
| WOS记录号 | WOS:000552403600003 |
| WOS关键词 | RARE-EARTH-ELEMENTS ; COUPLED SUBSTITUTIONS ; ABU-RUSHEID ; ORIGIN ; BORON ; GEOCHEMISTRY ; GRANITE ; EXAMPLE ; CRYSTALLIZATION ; PETROGENESIS |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS研究方向 | Geology |
| 资源类型 | 会议论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/337044 |
| 作者单位 | [Harraz, Hassan; Abd El Monsef, Mohamed] Tanta Univ, Fac Sci, Dept Geol, Tanta 31527, Egypt |
| 推荐引用方式 GB/T 7714 | Harraz, Hassan,Abd El Monsef, Mohamed. Elemental substitutions and compositional evolution during tourmaline formation in metasomatic schistose rocks of Sikait area in the Southern Eastern Desert, Egypt[C]:SPRINGER HEIDELBERG,2020. |
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