NDLI: Late Proterozoic older granitoids from the North Eastern desert of Egypt: petrogenesis and geodynamic implications

Please wait, while we are loading the content...

Kinematic vorticity technique for porphyroclasts in the metamorphic rocks: an example from the northern thrust in Wadi Mubarak belt, Eastern Desert, Egypt

Filtering of the gravimetric anomalies to the study of the geological structures of Oued Zarga (Septentrional Tunisia): structural implications

Arabian Journal of Geosciences : Volume 4

Arabian Journal of Geosciences : Volume 3

Arabian Journal of Geosciences : Volume 2

Arabian Journal of Geosciences : Volume 1

Late Proterozoic older granitoids from the North Eastern desert of Egypt: petrogenesis and geodynamic implications

Content Provider	Springer Nature Link
Author	Mahallawi, Mahmoud M. Ahmed, A. F.
Copyright Year	2010
Abstract	Major, trace, and REE data for three localities of calc–alkaline older granitoid rocks exposed in the north Eastern Desert of Egypt are presented. These rocks were selected to cover wide compositional spectrum of the Egyptian older granitoid varieties. They are petrographically represented by granodiorite, tonalite, quartz–diorite, and quartz–monzodiorite. The rocks are comparable with the peraluminous, unfractionated calc–alkaline suites and fall within the volcanic arc and I-type granite fields. So, they can be regarded as belonging to the volcanic arc collision stage (665–614 Ma). The granitoids are geochemically similar to other rocks recorded from continental margin arc-systems being exhibit light-REE enriched patterns with variable but chiefly positive Eu anomaly. The latter has reverse relationship with the ΣREE, which was attributed to the fractionation of hornblende during partial melting. These patterns are comparable with models involving partial melting of amphibolitic source. This source must represent basalts, gabbros, or volcanics of an island arc system that were transformed to the level of the island arc crust during continental growth where the P–T conditions are suitable for partial melting. Thus, it is plausible that the studied rocks were derived by partial melting of LREE-enriched, garnet-free, and amphibole-bearing (i.e., hydrated) mafic source. Wadi Milaha granitoids are consistent with the derivation by a high degree of partial melting (30–40%) of amphibolite protolith in the deep crust. However, the two other localities (Wadi Umm Anab and West Gharib) are matching with 20–30% partial melting. Within each locality, variation in rock types from granodiorite to tonalite is said to be dominated by variable degree of restite separation during magma ascent. The high water and volatile contents in Wadi Milaha granitoids allowed higher degree of partial melting (30–40%). Moreover, the lower volatile contents in the other two localities (Wadi Umm Anab and West Gharib) gave lower degrees of partial melting (20–30%). These processes may resemble important geodynamic features of the Arabo-Nubian Shield evolution in the north Eastern Desert of Egypt.صخور الجرانيتات القديمة لعصر البروتيروزوى المتأخر فى شمال الصحراء الشرقية بمصر: تطبيقات على أصلها ووضعها االجيوديناميكىتستعين الدراسة الحالية بتحاليل كيميائية للعناصر الشائعة والشحيحة والأرضية النادرة وذلك لصخور الجرانيتات االقديمة الواقعة بشمال الصحراء الشرقية المصرية ذات الطبيعة الكلس قلوية. وقد تم أنتقاء هذه الصخور بعناية لتغطى المدى التركيبى لتلك النوعية من الصخور ذات الأنتشار الواسع وهى ممثلة بتروجرافيا بنوعيات الجرانوديوريت والتوناليت والكورتز ديوريت والكورتز مونزوديوريت التى يمكن مقارنتها بالصخور الكلس قلوية المنتشرة بالجزر البركانية. لذلك فقد تم أعتبارها منتمية لمرحلة التصادم فى العمر الواقع بين 665-614 مليون سنة.وتتميز الصخور محل الدراسة بثراء نسبى فى العناصر الأرضية النادرة الخفيفة مع شذوذ ايجابى لعنصر الأوروبيم الذى يتناسب عكسيا مع مجموع العناصر الأرضية النادرة. هذه الخصائص الجيوكيميائية تدل على تفارق معدن الهورنبلند أثناء الأنصهار الجزئى لمصدر أمفيبوليتى وذلك تحت ظروف مائية.وقد وجد أن صخور الجرانيتات المتواجدة بوادى الملاحة قد أشتقت بدرجة أنصهار جزئى عالية نسبيا تتراوح بين 30 الى 40% وذلك لذيادة المحتوى المائى والغازى. بينما صخور منطقتى أم عنب وغرب غارب تتوافق مع أنصهار جزئى بدرجة 20 الى 30%. وأن الأختلافات المتواجدة بدخل صخور كل منطقة يمكن أن تعزى الى درجات متفاوتة لأنفصال المواد المقاومة للأنصهار أثناء صعود الصهير.ونشأة هذه الصخور بتلك العمليات يمكن أن تمثل أهمية بالغة للتطور الجيوديناميكى للدرع العربى النوبى بشمال الصحراء الشرقية المصرية.
Starting Page	15
Ending Page	27
Page Count	13
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	5
Issue Number	1
e-ISSN	18667538
Language	Arabic
Publisher	Springer-Verlag
Publisher Date	2010-03-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Egypt-north Eastern desert Arabo-Nubian shield Older granitoids Petrogenesis Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Dokhan volcanics of Gabal Monqul area, North Eastern Desert, Egypt: geochemistry and petrogenesis

Magmatic evolution of the area around Wadi Kariem, Central Eastern Desert, Egypt

On the petrogenesis and evolution of U-rich granite: insights from mineral chemistry studies of Gattar granite, North Eastern Desert, Egypt

Late Neoproterozoic alkaline magmatism in the Arabian–Nubian Shield: the postcollisional A-type granite of Sahara–Umm Adawi pluton, Sinai, Egypt

Tectonic Evolution of Gabal Loman Area, North Eastern Desert, Egypt: Implications from Low-Temperature Multithermochronometry on the Arabian-Nubian Shield

Paleozoic alkaline volcanism: geochemistry and petrogenesis of Um Khors and Um Shaghir trachytes of the central Eastern Desert, Egypt

Origin and evolution of post-collisional volcanism: an example from Neoproterozoic Dokhan volcanics at Gabal Nugara area, Northeastern Desert, Egypt

Pan-African adakitic rocks of the north Arabian–Nubian Shield: petrological and geochemical constraints on the evolution of the Dokhan volcanics in the north Eastern Desert of Egypt

On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt

Late Proterozoic older granitoids from the North Eastern desert of Egypt: petrogenesis and geodynamic implications

Similar Documents

Dokhan volcanics of Gabal Monqul area, North Eastern Desert, Egypt: geochemistry and petrogenesis

Magmatic evolution of the area around Wadi Kariem, Central Eastern Desert, Egypt

On the petrogenesis and evolution of U-rich granite: insights from mineral chemistry studies of Gattar granite, North Eastern Desert, Egypt

Late Neoproterozoic alkaline magmatism in the Arabian–Nubian Shield: the postcollisional A-type granite of Sahara–Umm Adawi pluton, Sinai, Egypt

Tectonic Evolution of Gabal Loman Area, North Eastern Desert, Egypt: Implications from Low-Temperature Multithermochronometry on the Arabian-Nubian Shield

Paleozoic alkaline volcanism: geochemistry and petrogenesis of Um Khors and Um Shaghir trachytes of the central Eastern Desert, Egypt

Origin and evolution of post-collisional volcanism: an example from Neoproterozoic Dokhan volcanics at Gabal Nugara area, Northeastern Desert, Egypt

Pan-African adakitic rocks of the north Arabian–Nubian Shield: petrological and geochemical constraints on the evolution of the Dokhan volcanics in the north Eastern Desert of Egypt

On the cratonization of the Arabian-Nubian Shield: Constraints from gneissic granitoids in south Eastern Desert, Egypt

Late Proterozoic older granitoids from the North Eastern desert of Egypt: petrogenesis and geodynamic implications