Mineral composition of the Cambrian-Cretaceous Nubian Series of Jordan: Provenance, tectonic setting and climatological implications

Petrography and geochemistry of Pharaonic sandstone monuments in Tall San Al Hagr, Al Sharqiya Governorate, Egypt: implications for provenance and tectonic setting

“…The scarcity of unstable grains (feldspar and other rock fragments) at <0.3% suggests that the source area underwent an intensive chemical weathering in a warm humid climate (Pettijohn et. al., 1987;Amireh, 1991).…”

The Ediacaran–Cambrian and Ordovician rocks of Al Qasim Province, Saudi Arabia: Facies, depositional history and regional correlation

“…The abundance of bioturbation in the middle part of the Araba Formation near Taba (Khalifa et al, 2006) and the increase in carbonate cements suggests that there was deepening in sea level upwards and towards the northeast and northwest, where the calcite cement predominates and the carbonate facies first appeared (Burj Formation) within the Middle Cambrian as recorded in Jordan and Syria (Amireh, 1991).…”

Provenance, diagenesis, tectonic setting, and geochemistry of Hawkesbury Sandstone (Middle Triassic), southern Sydney Basin, Australia

“…These variations may be related to relative changes in the climatic conditions in the source area. The moderate crystallinity exhibited by the clay minerals indicates their detrital origin from weathering horizons and soils developed on silicic rocks, and transportation in a fluvial environment (Keller, 1956;Abu-Zeid et al, 1989, 1991. Source area weathering is confirmed by the absence of smectite and the low percentage of chlorite (Table 2; Figure 4).…”

“…Such a craton type reflects mature sandstones derived from relatively low-lying granitoid and gneissic sources, supplemented by recycled sands from associated platform or passive margin basins (Dickson et al, 1983). The low percentage of unstable grains (feldspar and other rock fragments; <8.0%), the dominance of monocrystalline quartz, and the alteration of feldspar grains suggest that the source area underwent a long period of intensive chemical weathering in a warm humid climate (Pettijohn et al, 1987;Amireh, 1991). Total 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 32.00 100 0.00 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.229 0.000 0.000 n = Number of samples; SD = standard deviation; (SiO The percentage of major elements (Table 3) was used to discriminate the tectonic setting of sandstones (Schwab, 1975;Bhatia, 1983;Korsch 1986, 1988;Armstrong-Altrin et al, 2004).…”

“…The polycrystalline quartz grains composed of 3 or more crystals with straight to slightly curved intercrystalline boundaries indicate that the Hawkesbury Sandstone Formation was derived from plutonic igneous rocks (Folk, 1974;Blatt et al, 1980). The scarcity of feldspar and low percentage of rock fragments or their absence in many samples favors a cratonic source, mature transport regime, and long moderate chemical weathering in a warm, dry climate (Amireh, 1991;AlHabri and Khan, 2008). The low sedimentary rock fragments and the coaxial crystal overgrowth (i.e.…”