Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1127/0077-7757/2007/0074 |
Chromite mineralization in ultramafic rocks of the Wadi Ghadir area, Eastern Desert, Egypt: mineralogical, microchernical and genetic studies | |
Khalil, Khalil I. | |
通讯作者 | Khalil, Khalil I. |
来源期刊 | NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN
![]() |
ISSN | 0077-7757 |
出版年 | 2007 |
卷号 | 183期号:3页码:283-296 |
英文摘要 | The chromite deposit of Wadi Ghadir is situated in the Eastern Desert of Egypt and belongs to a Precambrian ophiolitic complex. The mineralization consists of lenses, pod-like bodies or of disseminated grains of chromite (Cr-spinel) and is found mainly in serpentinites and talc-carbonate rocks of the ophiolitic complex. The morphology of the chromitite bodies is deformed, slickensided and sometimes brecciated. The lenses strike NE-SW and so show the same main shear trend of the region. Chromite within the main chromitite ore bodies is generally homogeneous in geochemical composition, in cr-number and in mg-number while the disseminated grains of Cr-spinel show variations in the chemical composition and are often zoned with an inner core of Al-chromite, a transitional zone of Fe-chromite and an outer rim of Cr-magnetite. The cores of the zoned Cr-spinel represent the original composition of the disseminated grains and show less variation in composition than the chromite of the chromitite ore. These compositional differences are attributed to magmatic processes. The compositions of "ferritchromit" and chromian magnetite are markedly variable in terms of cr- and mg-numbers compared to the cores of the Cr-spinel. Compositional zonation is suggested to be achieved during the major phase of serpentinization. The formation of antigorite and chromiferous chlorite belongs to the same stage. A minimum temperature of 550 degrees C was estimated for antigorite-chlorite-ferritchromit assemblage. On the basis of field observations, textures of minerals and of geochemical composition, the chromite mineralization of Wadi Ghadir area displays features that are characteristics of the Alpine-type chromitite ore deposits. The rock assemblage is interpreted to be derived from harzburgite-dunite parental rocks, is suggested to have been formed at a mid-oceanic ridge and subsequently have been reemplaced by thrusting in a subduction zone setting. |
英文关键词 | chromite Alpine-type ophiolite complex serpentinization zonation |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000246629700004 |
WOS关键词 | PERIDOTITE XENOLITHS ; SPINEL ; COMPLEX ; CRYSTALLIZATION ; EVOLUTION ; OPHIOLITE ; SERPENTINIZATION ; FERRITCHROMIT ; DISTRICT ; MARYLAND |
WOS类目 | Mineralogy |
WOS研究方向 | Mineralogy |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/155496 |
作者单位 | (1)Univ Alexandria, Fac Sci, Dept Geol, Alexandria, Egypt |
推荐引用方式 GB/T 7714 | Khalil, Khalil I.. Chromite mineralization in ultramafic rocks of the Wadi Ghadir area, Eastern Desert, Egypt: mineralogical, microchernical and genetic studies[J],2007,183(3):283-296. |
APA | Khalil, Khalil I..(2007).Chromite mineralization in ultramafic rocks of the Wadi Ghadir area, Eastern Desert, Egypt: mineralogical, microchernical and genetic studies.NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN,183(3),283-296. |
MLA | Khalil, Khalil I.."Chromite mineralization in ultramafic rocks of the Wadi Ghadir area, Eastern Desert, Egypt: mineralogical, microchernical and genetic studies".NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN 183.3(2007):283-296. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Khalil, Khalil I.]的文章 |
百度学术 |
百度学术中相似的文章 |
[Khalil, Khalil I.]的文章 |
必应学术 |
必应学术中相似的文章 |
[Khalil, Khalil I.]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
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。