the nasirabad manganese deposit is located 5 km south of nasirabad, 8 km sw of neyriz in the fars province. structurally, the area is placed in the southeastern part of zagros thrust belt. in this area, the manganese mineralization occurred as ore layers and nodules, interlayered with pichakun radiolarite chert deposits. in this study, mineralogy and geochemistry of uranium, thorium and lead is...

The rare-earth element (REE) geochemistry of sedimentary deposits has been used in provenance investigations despite the transformation that this group elements may suffer during a depositional cycle. In present investigation, we and XRD mineralogy set sand mud fluvial to evaluate ability REE parameters tracing, changes associated with weathering sorting. analyzed were generated subtropical dra...

Abstract Knowledge of the timing closure Meso-Tethys Ocean as represented by Bangong–Nujiang Suture Zone, i.e., Lhasa-Qiangtang collision, is critical for understanding Mesozoic tectonics Tibetan Plateau. But this hotly debated; existing suggestions vary from Middle Jurassic (ca. 166 Ma) to Late Cretaceous 100 Ma). In study, we describe petrology Zhonggang igneous–sedimentary rocks in middle se...

A study on tin (Sn) mineralization indicator in Sungai Bahoi-Charok Jawa area was conducted through detailed field geological mapping and stream sediment geochemistry analysis. The consists mainly of Late Triassic igneous intrusion sedimentary rocks Carboniferous Kubang Pasu Formation. has successfully discovered a band brecciated phyllites along parts granite – phyllite contact zone limestone ...

Abundant pyrite in black shales at the Permian-Triassic Boundary (PTB) from several localities around world has been regarded as evidence of oceanic anoxia during end-Permian mass extinction (EPME). However, a significant amount “pyrite” these rocks is not actually but marcasite, orthorhombic polymorph FeS2. Marcasite particularly sensitive to changes pH and fO2, which theoretically enables it ...

Sedimentary iron sulfide minerals play a key role in maintaining the oxygenation of Earth’s atmosphere over geological timescales; they also record critical geochemical information that can be used to reconstruct paleo-environments. On modern Earth, sedimentary iron sulfide mineral formation takes places in low-temperature environments and requires the production of free sulfide by sulfate-redu...

petrography, modal analysis of sandstones and major elements geochemistry of shales of early cambrian zagun formation in sarbandan section, central alborz, are used to identify their provenance (including parent rocks, tectonic setting and paleo-weathering). petrography of the sandstones and plotting their point counting data on qt44, f47, l9 and qm44, f45 ,lt11 diagrams imply that they are ark...