气候变化领域集成服务门户(CCPortal): Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt

CCPortal

DOI	10.3390/min13020160
	Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt
	Fathy, Douaa; Abart, Rainer; Wagreich, Michael; Gier, Susanne; Ahmed, Mohamed S.; Sami, Mabrouk
发表日期	2023
EISSN	2075-163X
卷号	13 期号:2
英文摘要	Climatic variability and silicate weathering are remarkable features throughout the Late Cretaceous period. Late Campanian black shale is considered the most significant silicate source rock in the southern Tethys. Here, we used mineralogical and geochemical data to evaluate the continental weathering intensity and climatic changes as well as their impact on the deposition of the Late Campanian black shale in the Western Desert of Egypt. The studied black shale has a relatively high concentration of Al, Fe, Mg, Ca, Sr, Ga, Co, Cr, and V when compared to the average Post-Archean Australian Shales (PAAS). The studied samples have elevated values of Ga/Rb, and low values of Rb/Sr, Sr/Cu, and K2O/Al2O3, supporting the deposition of Late Campanian shale under warm/humid conditions. Furthermore, the average chemical index of alteration (CIA, 78.6%), chemical index of weathering (CIW; 83.8%), C-value (1.26), Fe/Mn (408), and Mg/Ca (1.54) reveal the predominance of warm/humid climate. The chemical weathering proxies (CIA, CIW, PIA, LnAl(2)O(3)/Na2O) and ACNK diagram imply that the Late Campanian samples were exposed to a moderate grade of chemical alteration. The deposition of black shale occurred under high seawater salinity conditions based on Sr/Ba (Avg = 3.6). Additionally, the weathering indices are well correlated with paleoclimatic proxies, suggesting that weathering intensity is strongly affected by paleoclimate. However, chemical weathering during the Late Campanian has a weak influence on oceanic nutrient fluxes. No substantial impact of the paleoclimate during the deposition of Late Campanian black shale on water salinity was reported.
英文关键词	paleoceanography; Abu Tartur; black shale; geochemistry; greenhouse climate; nutrients; salinity; source rocks
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000941514500001
来源期刊	MINERALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/281407
作者单位	Egyptian Knowledge Bank (EKB); Minia University; University of Vienna; University of Vienna; King Saud University
推荐引用方式 GB/T 7714	Fathy, Douaa,Abart, Rainer,Wagreich, Michael,et al. Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt[J],2023,13(2).
APA	Fathy, Douaa,Abart, Rainer,Wagreich, Michael,Gier, Susanne,Ahmed, Mohamed S.,&Sami, Mabrouk.(2023).Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt.MINERALS,13(2).
MLA	Fathy, Douaa,et al."Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt".MINERALS 13.2(2023).