Constraints on unconsolidated pyroclastic flow sediments related REE enrichments originated from potassic-alkaline Gölcük stratovolcano: Darıdere-Direkli-Yakaören (DDY) table 4deposits,southwestern Anatolia of Turkey

Acta Geochimica - In the last five decades, Rare Earth Elements (REE) are mostly produced from carbonatite complexes and alkaline magmatic environments. In this respect, pyroclastic flows produced...     

Sulfur-isotope distribution and contamination related to the Balya Pb–Zn Mine in Turkey

Sulfur-isotope (³⁴S) values and weight (%) of acid-volatile sulfur (AVS), chrome-reducible sulfide (CRS), elemental sulfur (ES), and acid-soluble sulfates were determined in Balya Mine ore rock, mine wastes, and Kocacay River and Lake Manyas sediments. Estimation of isotopic fractionation (³⁴S) between product sulfate and initial CRS (pyrite) was used to evaluate the progress of sulfide oxidation in the mine-waste area. Water- and acid-soluble sulfate produced from different mine-waste samples, such as metallurgical waste (MW) and waste rock (WR), in laboratory experiments also shows distinct ³⁴S values and allows identification of the acid-mine-drainage sources in the mine-waste area. Average ³⁴S_SO4values are –1.43 for MW (n=4) and +2.06 for WR (n=8). Short (24 hr) and long (60 days) term leach experiments were considered using alternating wet/dry conditions to simulate sulfate-production capacity and metal-discharge characteristics for MW and WR piles. Release of heavy metals follows the order of Pb²⁺ >Mn²⁺ >Zn²⁺ >Cu²⁺ for these pile samples. Values of ³⁴S_SO4 for river water that was collected after 3–4 h of heavy rainfall are close to values of ³⁴S_SO4 for water-soluble sulfates from mine-waste piles used in laboratory leach experiments.This revised version was published in February 2005 with corrections to the placement of the figures.