Late Campanian Climatic-Continental Weathering Assessment and Its Influence on Source Rocks Deposition in Southern Tethys, Egypt

Climatic variability and silicate weathering are remarkable features throughout the Late Cretaceous period. Campanian black shale is considered most significant source rock in southern Tethys. Here, we used mineralogical geochemical data to evaluate continental intensity climatic changes as well their impact on deposition of Western Desert Egypt. The studied has a relatively high concentration Al, Fe, Mg, Ca, Sr, Ga, Co, Cr, V when compared average Post-Archean Australian Shales (PAAS). samples have elevated values Ga/Rb, low Rb/Sr, Sr/Cu, K2O/Al2O3, supporting under warm/humid conditions. Furthermore, chemical index alteration (CIA, 78.6%), (CIW; 83.8%), C-value (1.26), Fe/Mn (408), Mg/Ca (1.54) reveal predominance climate. proxies CIW, PIA, LnAl2O3/Na2O) ACNK diagram imply that were exposed moderate grade alteration. occurred seawater salinity conditions based Sr/Ba (Avg = 3.6). Additionally, indices correlated with paleoclimatic proxies, suggesting strongly affected by paleoclimate. However, during weak influence oceanic nutrient fluxes. No substantial paleoclimate water was reported.