干旱区生态环境知识资源中心(Arid): Alteration patterns related to copper mineralization in dioritic rocks at the Dara area, north Eastern Desert, Egypt

Arid

DOI	10.1007/s12517-021-07495-4
	Alteration patterns related to copper mineralization in dioritic rocks at the Dara area, north Eastern Desert, Egypt
	Helba, Hossam A.; Ghonaim, Mohamed A.; Khalil, Sobhy O.; El Makky, Ahmed M.
通讯作者	Helba, HA (corresponding author), Alexandria Univ, Geol Dept, Fac Sci, Alexandria 21511, Egypt.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2021
卷号	14 期号:12
英文摘要	The Dara copper mineralization is one of more than 15 copper occurrences distributed in the Neoproterozoic crust of the Eastern Desert of Egypt. The mineralization is hosted by calc-alkaline diorite and granodiorite rocks of I-type affinity and occurs as disseminated grains within NW trending veins and shear zones. Hydrothermal and supergene alteration signs were observed around the mineralized quartz veins. Major oxide and selected trace element analysis combined with textural relations and mineral associations was used to characterize and quantify the alteration processes in the Dara occurrence and to shed light on the nature of the invading hydrothermal fluids. Sericite-pyrite and chlorite-sericite alteration zones were recognized. Based on mass balance data, two successive hydrothermal stages were suggested. Initial fluids characterized by high aH(+) and K+ activity are suggested for both stages. However, the first hydrothermal stage is characterized by fluids enriched in Cu content, whereas the second hydrothermal stage is characterized by fluids of higher Fe2+ and Mg2+ activities. Magmatic- rather than metamorphic-related fluids can be suggested based on the physicochemical conditions of formation of the hosted rocks and alteration products. Copper may be leached from the gabbro-diorite country rock that contains up to 0.9 wt.% Cu. The copper mineralization of the Dara area may belong to the magmatic-hydrothermal iron oxide-copper-gold (IOCG) deposit category rather than to the porphyry copper system.
英文关键词	Copper mineralization Hydrothermal alteration Mass balance Mineral paragenesis Dara area-Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000677556200024
WOS关键词	HYDROTHERMALLY ALTERED ROCKS ; ARABIAN-NUBIAN SHIELD ; CU-AU DEPOSIT ; GOLD MINERALIZATION ; PORPHYRY ; GEOCHEMISTRY ; STOICHIOMETRY ; STABILITY ; COMPLEXES ; EVOLUTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362530
作者单位	[Helba, Hossam A.; Khalil, Sobhy O.] Alexandria Univ, Geol Dept, Fac Sci, Alexandria 21511, Egypt; [Ghonaim, Mohamed A.] Egyptian Mineral Resources Author EMRA, Cairo, Egypt; [El Makky, Ahmed M.] Alexandria Univ, Biol & Geol Sci Dept, Fac Educ, Alexandria, Egypt
推荐引用方式 GB/T 7714	Helba, Hossam A.,Ghonaim, Mohamed A.,Khalil, Sobhy O.,et al. Alteration patterns related to copper mineralization in dioritic rocks at the Dara area, north Eastern Desert, Egypt[J],2021,14(12).
APA	Helba, Hossam A.,Ghonaim, Mohamed A.,Khalil, Sobhy O.,&El Makky, Ahmed M..(2021).Alteration patterns related to copper mineralization in dioritic rocks at the Dara area, north Eastern Desert, Egypt.ARABIAN JOURNAL OF GEOSCIENCES,14(12).
MLA	Helba, Hossam A.,et al."Alteration patterns related to copper mineralization in dioritic rocks at the Dara area, north Eastern Desert, Egypt".ARABIAN JOURNAL OF GEOSCIENCES 14.12(2021).