Exploration Targeting in the Shadan Porphyry Gold–Copper Deposit, Lut Block, Iran: Analysis of Spatial Distribution of Sheeted Veins and Lithogeochemical Data

Abstract

The Lut Block is a potential porphyry-style mineralized region in Iran including the well-explored Shadan porphyry gold-copper deposit, which has an extensive zone of gold- and copper-bearing stockwork-like sheeted veins. The structural setting of this deposit is a key to understanding the genesis of the mineralization. Our field studies show that the mineralization occurs as steeply dipping ore bodies along NW–SE transpressional faults. The zones with a high frequency of veins and volume of veins have a NW–SE trend, which is closely related to transpressional faults. We propose that such a compressional regime inhibits focused ore-forming fluid flow to higher levels in the crust. After a local change in stress field, fluid depressurization and channeling along transpressional faults generated the sheeted veins. This indicates an important role of these transpressional faults in focusing and controlling mineralization within this porphyry deposit, which has important implications for the exploration of porphyry deposits on a regional scale. The spatial distribution of sheeted veins is used to examine gold anomalies from lithogeochemical data extracted by fractal models. The results show that a combination of high vein density and high vein volume areas with gold anomalies could result in identifying areas with greater potential at the deposit to regional scale.

Zircon U–Pb–Hf and whole‐rock Sr–Nd isotopic insights on the Silurian syenite–monzonite shoshonitic magmatism of Central Iran

“…The Posht-e-Badam Block, which is located between the Yazd and Tabas blocks, is the epitome of strata where Late Neoproterozoic formations and Lower Palaeozoic rocks are abundant. In addition to the investigations on the Cadomian detrital sequences, many studies have been carried out to decipher the geochemical, geochronology and isotopic signatures for the igneous rocks of Central Iran (e.g., Nayebi et al, 2023;Raeisi et al, 2019Raeisi et al, , 2023Mehdipour Ghazi et al, 2020;Moghadam et al, 2015;Ramezani & Tucker, 2003). The north Posht-e-Badam (hereafter NPB) igneous rocks are the most recently explored magnetite-apatite anomaly in Central Iran.…”