| چکیده انگلیسی مقاله |
In this study, the trace element composition of various types of granitoids (I-type, S-type, and plagiogranites) at different geological settings was measured using the LA-ICP-MS method, and their distribution was investigated. The amounts of elements Al, Ti, Fe, Mn, Na, K, P, Li, Rb, Be, Sr, Ga, Ge, and Sn in quartz were determined to be above the detection limit. The resulting data indicate that despite variations in age and formation settings, the content and distribution of trace elements in quartz crystals of granitoids are influenced by the type and nature of granitic magma. The S-type granitoids have quartz crystals with the highest abundance of sum trace elements (710-1111 ppm), followed by I-type granitoids (287-438 ppm) and plagiogranites (201-116 ppm). Among the trace elements present in quartz, aluminum (ppm 18-216) exhibits the highest abundances, followed by titanium (ppm 44-183) and lithium (ppm 5-80), entering the crystal lattice with relatively high concentrations. The Aluminum Saturation Index (ASI) is the most significant factor in the distribution of Al in quartz crystals, and the Al content increases with an increase in the Ge/Ti differentiation coefficient. The concentration distribution and variation trends relative to the differentiation ratio of elements Ga, Ge, Li, and Rb in quartz crystals are similar to aluminum. The abundance of Ti decreases with increasing the Ge/Ti, and the distribution of this element in quartz crystals is dependent not only on the nature and composition of the parent magma but also on the ambient temperature-pressure conditions. Thermometric calculations using the Titan Q method (Ti in quartz) indicate that the crystallization temperature of quartz in S-type granitoids (average 776 °C) is higher than in I-type granitoids (average 707 °C) and plagiogranites (average 683 °C). Due to their very low concentrations and the influence of other factors such as involved fluids or very fine inclusions, other trace elements in quartz crystals exhibit irregular distributions. |
