Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s12517-012-0824-y |
Geology and geochemistry of Kurkur bentonites, southern Egypt: provenance, depositional environment, and compositional implication of Paleocene-Eocene thermal maximum | |
Abou Elmagd, Kamal1; Ali-Bik, Mohamed Wahbi2; Abayazeed, Salwa Dahab2 | |
通讯作者 | Ali-Bik, Mohamed Wahbi |
来源期刊 | ARABIAN JOURNAL OF GEOSCIENCES
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ISSN | 1866-7511 |
EISSN | 1866-7538 |
出版年 | 2014 |
卷号 | 7期号:3页码:899-916 |
英文摘要 | A large lower Eocene bentonite deposit at the top of Sinn El-Kaddab plateau, southern Egypt, is investigated. It forms isolated anticlinal hills as mesa and cuesta geomorphic units. The Sinn El-Kaddab plateau (497 m above sea level) with Gebel Abyad in northern Sudan represent the most southern margin of Tethys realm in East Africa. Clay and silt fractions constitute up to 95 % of the bentonite and calcium montmorillonite is the predominant phase (70-87 %). These sediments were deposited during the Paleocene-Eocene Thermal Maximum (PETM) event. Grain-size distribution in conjunction with their geologic setting argues in favor of a low energy deep hemipelagic, restricted basin within the outer shelf zone. They suggest sporadic deposition in a basin characterized by relief oscillation, in response to continuous tectonic uplifting. The sediments of the peripheral parts of the basin are more calcareous and were deposited in an arid climatic condition. Calcium montmorillonite was deposited in subtropical warm climate, with alternating wet and dry seasons. Compositionally, the bentonite shales are basic to intermediate and exhibit a rather limited range of K2O/Na2O and SiO2/Al2O3 ratios. They suggest mature polycyclic silici-clastics as the main provenance and within-plate alkali basalts as a main igneous precursor. They are the product of intensive physical weathering process in response to combined effects of both tectonic disturbance and prevailed climatic conditions during the PETM event. Geochemically, they are interpreted in terms of mixing of two end-members: pure clastic terrigenous component (inherited from the source area) and carbonate-rich matrix. |
英文关键词 | Geology Geochemistry Kurkur bentonite PETM |
类型 | Article |
语种 | 英语 |
国家 | Egypt |
收录类别 | SCI-E |
WOS记录号 | WOS:000332487800006 |
WOS关键词 | SEA-LEVEL ; SEDIMENTS ; DIAGENESIS ; ELEMENTS ; SECTION ; ZR |
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/2XILL650/180765 |
作者单位 | 1.Aswan Univ, Fac Sci, Dept Geol, Aswan, Egypt; 2.Natl Res Ctr, Dept Geol Sci, Cairo, Egypt |
推荐引用方式 GB/T 7714 | Abou Elmagd, Kamal,Ali-Bik, Mohamed Wahbi,Abayazeed, Salwa Dahab. Geology and geochemistry of Kurkur bentonites, southern Egypt: provenance, depositional environment, and compositional implication of Paleocene-Eocene thermal maximum[J],2014,7(3):899-916. |
APA | Abou Elmagd, Kamal,Ali-Bik, Mohamed Wahbi,&Abayazeed, Salwa Dahab.(2014).Geology and geochemistry of Kurkur bentonites, southern Egypt: provenance, depositional environment, and compositional implication of Paleocene-Eocene thermal maximum.ARABIAN JOURNAL OF GEOSCIENCES,7(3),899-916. |
MLA | Abou Elmagd, Kamal,et al."Geology and geochemistry of Kurkur bentonites, southern Egypt: provenance, depositional environment, and compositional implication of Paleocene-Eocene thermal maximum".ARABIAN JOURNAL OF GEOSCIENCES 7.3(2014):899-916. |
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