CAJ | 학술논문

新疆备战铁矿是西天山阿吾拉勒铁铜金成矿带上重要的铁矿床之一,矿区南部出露有钾长花岗岩和钾长花岗斑岩,两者之间呈脉动侵入接触关系.岩石地球化学研究表明,分析样品均属于高硅、富钾钙碱性系列,富集大离子亲石元素 Rb、K,亏损高场强元素,具有明显的 Ba、Sr、P、Ti 负异常,轻、重稀土元素分馏明显.LA-ICP-MS 锆石 U-Pb 测年结果表明,钾长花岗岩和钾长花岗斑岩形成时代分别为(320．5±1．9)Ma 和(306．8±1．6)Ma.依据岩石地球化学、年代学,结合区域地质资料,矿区出露的钾长花岗岩和钾长花岗斑岩为同源岩浆产物,可能形成于早石炭世末-晚石炭世时期的南天山洋俯冲结束向陆内碰撞造山带转换阶段中.
신강비전철광시서천산아오랍륵철동금성광대상중요적철광상지일,광구남부출로유갑장화강암화갑장화강반암,량자지간정맥동침입접촉관계.암석지구화학연구표명,분석양품균속우고규、부갑개감성계렬,부집대리자친석원소 Rb、K,우손고장강원소,구유명현적 Ba、Sr、P、Ti 부이상,경、중희토원소분류명현.LA-ICP-MS 고석 U-Pb 측년결과표명,갑장화강암화갑장화강반암형성시대분별위(320．5±1．9)Ma 화(306．8±1．6)Ma.의거암석지구화학、년대학,결합구역지질자료,광구출로적갑장화강암화갑장화강반암위동원암장산물,가능형성우조석탄세말-만석탄세시기적남천산양부충결속향륙내팽당조산대전환계단중.
Beizhan iron deposit in Xinjiang is one of the important deposits of Awulale iron-copper-gold metallogenic belt in the western Tianshan.K-feldspar granite and K-feldspar granite porphyry, which have pulsating intrusive contact relationship,are exposed in the southern of iron district. Geochemical characteristics show that the rocks are high potassium calc-alkaline,enriched in large iron lithophile element (Rb and K),and relatively depleted in high field strength elements, and Ba,Sr,P and Ti are significantly negative anomaly;fractionation of light and heavy rare earth elements is obvious.Ages of K-feldspar granite and K-feldspar granite porphyry from Beizhan iron deposit are respectively (320.5 ± 1.9 )Ma and (306.8 ± 1.6 )Ma by the method of LA-ICP-MS zircon U-Pb dating.Combined with regional geological data,the geochemical and geochronological results show that K-feldpar granite and K-feldspar granite porphyry exposed have the same magma source,and probably form in the tectonic setting transformed from the subduction of southern Tianshan oceans to the continental collision orogeny from Early Carboniferous to Late Carboniferous.