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DOI | 10.1078/0009-2819-00009 |
The role of fractional crystallization and assimilation in the evolution of the zoned Mukhattata pluton, Eastern Desert, Egypt | |
El-Nisr, SA; El-Sayed, MM | |
通讯作者 | El-Nisr, SA |
来源期刊 | CHEMIE DER ERDE-GEOCHEMISTRY
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ISSN | 0009-2819 |
出版年 | 2002 |
卷号 | 62期号:3页码:216-236 |
英文摘要 | The zoned Mukhattata pluton, covering an area of about 25 km(2), is composed of three zones becoming more felsic towards the centre of the pluton (normal zoning). The most outer zone consists of gabbro/diorite composition changing into tonalite (second zone) and granodiorite in the core (third zone). The tonalite is characterized by abundant gabbroid xenoliths, their number and size decreases towards the granodiorite in the core. The Mukhattata pluton exhibits geochemical features of I-type calc-alkaline rocks emplaced in a volcanic arc environment. The geochemical variations of major, trace and REE of gabbro/diorite, tonalite and granodiorite provide evidence that the different intrusions result from a progressive fractional crystallization of a single parental magma. Low and variable Mg# (33-48) of the gabbro/diorite outer zone and transitional contacts between them suggest that they were derived by fractional crystallization. A tonalitic magma intruded the gabbro/diorite producing the outer zone of gabbro/diorite composition. The presence of gabbroid xenoliths in the tonalite suggests that the assimilation process played some role during the formation of tonalitic rocks. Finally, the tonalite was intruded by granodioritic magma producing the core of the Mukhattata pluton. The petrological and geochemical results for the Mukhattata pluton reveal a transition from an early passive style of emplacement involving stoping of the tonalite by gabbro/diorite, to forceful emplacement of later granodiorite in the core. |
英文关键词 | Eastern Desert Zoned Mukhattata pluton calc-alkaline fractional crystallization assimilation |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000178835500003 |
WOS关键词 | A-TYPE GRANITES ; GEOCHEMICAL CHARACTERISTICS ; CRUSTAL EVOLUTION ; PETROGENESIS ; ROCKS ; GENESIS ; DISCRIMINATION ; SERIES ; MASSIF ; NOMENCLATURE |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/142298 |
作者单位 | (1)Univ Alexandria, Fac Sci, Dept Geol, Alexandria, Egypt |
推荐引用方式 GB/T 7714 | El-Nisr, SA,El-Sayed, MM. The role of fractional crystallization and assimilation in the evolution of the zoned Mukhattata pluton, Eastern Desert, Egypt[J],2002,62(3):216-236. |
APA | El-Nisr, SA,&El-Sayed, MM.(2002).The role of fractional crystallization and assimilation in the evolution of the zoned Mukhattata pluton, Eastern Desert, Egypt.CHEMIE DER ERDE-GEOCHEMISTRY,62(3),216-236. |
MLA | El-Nisr, SA,et al."The role of fractional crystallization and assimilation in the evolution of the zoned Mukhattata pluton, Eastern Desert, Egypt".CHEMIE DER ERDE-GEOCHEMISTRY 62.3(2002):216-236. |
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