ДУНД-ДЭЭД ЮРЫН ХУЖИРТ ОРДЫН НҮҮРСНИЙ ГЕОХИМИЙН СУДАЛГАА: ХОЙД МОНГОЛЫН ЮРЫН УУР АМЬСГАЛ, ГЕОДИНАМИКИЙН НӨХЦЛИЙН АСУУДАЛД
Keywords:
юра, нүүрс, сарнимал элемент, үндсэн исэл, тектоник, форландAbstract
Khujirt is a syncline that hosts Jurassic coal deposit in Northern Mongolia. Nine coal samples collected from exploration borehole were selected for analyses of major oxide and trace elements of coal ash. The average value of CAI for the samples is 82.8, reflecting intensive weathering in the source area. The plotted data on A-CN-K diagram displays that rocks in coal were sourced mainly from Early Permian andesite and basalt and Early Paleozoic granodiorite, which borders Khujirt syncline. It is also supported by Al2O3/TiO2 (avg. 18.4) and Ti/Zr (avg. 37.1) ratios. To infer tectonic setting, two multi-dimensional discrimination diagrams were used. The results suggest that the tectonic setting of Khujirt was foreland basin that was probably formed by closure of Mongol-Okhotsk Ocean. Low Rb/Sr (0.02-0.04) and high Sr/Cu (13.8-30.6) ratios of the studied samples indicate that arid climate condition was dominant during the deposition of Khujirt peat accumulation. This conclusion is supported by C-values. Due to arid condition, salinity was high, reflected by substantially high Sr/Ba ratio varying from 1.7 to 2.7.
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