【摘要】 本文运用电子探针和氧同位素测试等手段,分析了和田河流域沙物质及某些有关基岩所含角闪石的种类、普通角闪石的化学成分和石英的δ¹⁸O值。沙物质和岩浆岩（钾长花岗岩）在所含角闪石种类以及普通角闪石化学成分上的差异性明显大于相似性,说明后者为前者提供的角闪石有限。另外,沙丘沙含有多种变质成因的角闪石。产生这种现象的合理解释是:变质岩风化产物是沙的重要物源。沙物质中石英δ¹⁸O值介于变质石英氧同位素成分范围,并且粒度愈细的石英,δ¹⁸O值愈高。根据基岩中云母片岩所含石英颗粒最细、δ¹⁸O值最高的特点判断,细沙物质在风扬过程中混入了较多的高δ¹⁸O值细粒变质石英。更多还原

【Abstract】 With EPMA and analysis of oxygen isotope composition, the typies of amphibole, chemical composition of hornblende and oxygen isotope composition of quartz in sands and bedrocks in the Hotan River basin were determined. There are a number of amphiboles developed in metamorphic rocks in sands, and the oxygen isotope compositions of quartz in dune sands and similar to that of metamorphic quartz. These cases are considered to results from the mixing of material dertived from metamorphic rocks.更多还原