新疆哈密黄园山沉积变质型铁磷矿岩石地球化学特征及其原岩恢复
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摘要
沉积变质型铁磷矿床是我国铁磷矿的重要成矿类型。新疆哈密黄园山地区铁磷矿化点是在那拉提—红柳河缝合带北缘发现的沉积变质型铁磷矿化点,赋矿地层为一套长城系星星峡群中—深程度变质岩系,主要岩石类型为黑云角闪岩。岩石地球化学特征分析及原岩恢复表明:赋矿的星星峡群变质岩的原岩主要为一套杂砂岩夹火山碎屑岩;微量元素Sr、Ba、Ti明显亏损,含矿岩石稀土元素配分型式基本一致,基本上呈弱"V"型平滑曲线,均显示Eu、Gd严重亏损。在上述分析的基础上,进一步分析认为:黄园山地区具有良好的沉积变质型铁磷矿的成矿条件,铁磷矿化主要受NWW向断裂控制,同时与磁异常高值关系密切,航磁高值异常为最直接的找矿标志。
Sedimentary metamorphic iron and phosphate deposit is the important metallogenic types in our country. The iron and phosphate mineralization point in Huayuanshan area in Hami County,Xinjiang belongs to sedimentary metamorphic iron and phosphate mineralization types that is found in the north margin of Nalati-Hongliuhe suture zone. The ore-hosting of the mineralization point is the mediumdeep metamorpic rock series of Xingxingxia Group of Changchengian System,the main rock types is stavrite. The analysis results of lithogeochemical characteristics and protolith reconstruction show that the original rock is mainly for a set of graywacke contains volcanic clastic rock; the trace elements of Sr,Ba and Ti are obviously missing,the distribution pattern of rare earch elements is basically consistent of the ore-bearing rocks,the distribution pattern of rare earch elements basically presents with a smooth curve of weak " V" type,which both show the significant lossess phenomenon of Eu and Gd. Based on the above discussion results,the further study results indicated that the metallogenic conditions of iron and phosphate deposit in Huangyuanshan area is good,the iron and phosphate mineralization is mainly controlled by NWW-trending faults,and the iron and phosphate mineralization is closely related to magnetic anomalies with high values,the aeromagnetic anomalies with high values can be taken as the most direct prospecting indicators of the area.
Sedimentary metamorphic iron and phosphate deposit is the important metallogenic types in our country. The iron and phosphate mineralization point in Huayuanshan area in Hami County,Xinjiang belongs to sedimentary metamorphic iron and phosphate mineralization types that is found in the north margin of Nalati-Hongliuhe suture zone. The ore-hosting of the mineralization point is the mediumdeep metamorpic rock series of Xingxingxia Group of Changchengian System,the main rock types is stavrite. The analysis results of lithogeochemical characteristics and protolith reconstruction show that the original rock is mainly for a set of graywacke contains volcanic clastic rock; the trace elements of Sr,Ba and Ti are obviously missing,the distribution pattern of rare earch elements is basically consistent of the ore-bearing rocks,the distribution pattern of rare earch elements basically presents with a smooth curve of weak " V" type,which both show the significant lossess phenomenon of Eu and Gd. Based on the above discussion results,the further study results indicated that the metallogenic conditions of iron and phosphate deposit in Huangyuanshan area is good,the iron and phosphate mineralization is mainly controlled by NWW-trending faults,and the iron and phosphate mineralization is closely related to magnetic anomalies with high values,the aeromagnetic anomalies with high values can be taken as the most direct prospecting indicators of the area.
引文
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[3]夏学惠,谭云基,杨辉艳,等.新疆天山成矿带铁磷矿地质及成矿专属性[J].中国地质,2012(2):486-496.
[4]夏学惠,谭云基,武亦立,等.新疆库鲁克塔格地区铁磷矿成矿条件及找矿预测[J].化工矿产地质,2008,30(2):91-98.
[5]胡霭琴,韦刚健,邓文峰,等.天山东段1. 4 Ga花岗闪长质片麻岩SHRIMP锆石U-Pb年龄及其地质意义[J].地球化学,2006,35(4):333-345.
[6]郭琳.新疆东天山喀拉塔格地区星星峡岩群地质特征及时代讨论[D].西安:长安大学,2009.
[7]卞翔,伊其安,杨硕,等.巴伦台地区星星峡岩群岩石地球化学特征、锆石U-Pb年龄及原岩恢复[J].新疆地质,2016,34(1):76-83.
[8]王元龙,成守德.新疆地壳演化与成矿[J].地质科学,2001,36(2):129-143.
[9]董连慧,屈迅,朱志新,等.新疆大地构造演化与成矿[J].新疆地质,2010,28(4):351-357.