The carbonate rock-hosted epithermal gold deposit of Agdarreh, Takab geothermal field, NW Iran—hydrothermal alteration and mineralisation

Micro-Raman spectroscopy in the identification of wulfenite and vanadinite in a Sasanian painted stucco fragment of the Ghaleh Guri in Ramavand, western Iran

“…The chemistry of the red vermilion may however give a hint about its origin. Natural sources of cinnabar in Iran are rare and only reported to occur in gold deposits of north-western Iran [21,22], where late ore fluids of silica (SiO 2 ) and barite (BaSO 4 ) are enriched in As and Hg, and precipitated orpiment (As 2 S 3 ) and cinnabar are in open spaces [22]. Thus, the absence of As and Ba in the composition of the red paint (Table 1) may pose a serious question on the natural provenance of the red vermilion.…”

Right-lateral shear across Iran and kinematic change in the Arabia-Eurasia collision zone

“…11a). It is conventionally mapped as west‐directed thrust, placing the Angouran block westwards over the Takab Basin (Alavi & Amidi 1976; Daliran 2008). However, there is no consistent older‐over‐younger relationship across the fault: Lower‐Middle Miocene intermediate‐acidic pyroclastics and lavas crop out on both sides of the fault trace (Fig.…”

“… Geology of the Takab (Geynardjeh‐Charhartagh) Fault (Alavi & Amidi 1976; Daliran 2008). (a) Topography (SRTM) and extent of the apparent offset of Lower‐Middle Miocene volcanics from A‐A′.…”

“…A strike-slip component to the fault displacement is supported by the sub-vertical dip of the fault at exposed levels (Sahandi 1992) and the changing age relationships across it: older rocks are present on the southwest side of the fault in the northwest, whereas in the southeast the older rocks are on the northeast side. These relationships are not compatible with a simple dip-slip structure, but make sense (1976), Daliran (2008) if a folded region is cut by a strike-slip fault, possibly with a helicoidal form, that is, changing in dip direction along its length. There are no major (magnitude >5) instrumentally recorded earthquakes along the Dehu Fault ( Fig.…”

Epithermal Origin and Environmental Evolution of Iron-Hosted Thallium and Kerogen Deposits: The Lodares Area Case (Soria, Spain)

“…[8][9][10][11][12][13][14]. The Lodares (Soria, Spain) area deposits and other similar carbonate rock-hosted epithermal deposits could be interesting polymetallic sources, e.g., the Jas Roux deposit (France) with Tl phases hosted in Triassic calcareous rocks [15], the Alshar Au-As-Sb-Tl deposit (Macedonia) developed as a mineralized breccia at the contact of volcanic rocks with dolomites, jasperoid beds in the carbonate rocks, and vein-disseminated zones in dolomites and Tertiary volcanic rocks [16], or the case of Agdarreh (Iran) [17] which includes: (1) pre-ore decalcification with dolomite dissolution re-precipitation, (2) a first-stage silicification process associated with pyrite, (3) a second-stage silicification linked with precipitation of galena and, Hg-Tl-Sb-As sulfides, (4) late-stages of cinnabar and baryte in pockets; (5) oxide ore stage and carbonate alteration, e.g., complex Mn-Fe-rich oxy-hydroxides, arsenates, sulfates in residual leached rock and infill of karstic cavities. A possible explanation for the frequent Fe and Mn coupling and redox sensitive elements could be its hydrothermal origin associated to cap carbonates [18].…”