冀东地区孤山子铜镍—钛铁矿地质特征、矿床成因及找矿预测

发布时间：2018-06-15 11:32

本文选题：矿床地质特征 + 矿床成因　；参考：《吉林大学》2017年硕士论文

【摘要】：孤山子铜镍-钛铁矿床位于河北省承德市宽城县,中朝准地台燕山台褶带东段,马兰峪复式背斜的北缘。孤山子基性-超基性岩体主要有辉石岩和角闪辉石岩组成,岩石组合的类型处于铜镍硫化物矿床和钛铁氧化物矿床的过渡。孤山子岩体源岩来源于受俯冲作用改造的交代地幔部分熔融,岩浆上升过程中混染少量地壳物质。厘定孤山子岩体侵位时代为275Ma±,成岩成矿构造背景为古亚洲洋后碰撞时期;54Ma±区内有一期热液叠加成矿事件。孤山子矿床的成矿过程和矿床的成因类型很复杂,由早到晚形成不同类型的矿床。海西晚期的岩浆晚期结晶分异作用形成岩浆分结矿床,此时主要形成钛铁氧化物矿床。随后发生岩浆熔离成矿作用而形成岩浆熔离矿床,主要为铜镍硫化物矿床。始新世初期有一期热液叠加的成矿事件。一般来说,与基性-超基性岩体相关的岩浆类型的铜镍矿床并不能跟钛铁矿床共生。形成孤山子铜镍、钛铁矿床共生关系的原因,可能是岩浆剧烈的活动以及演化,而钛铁氧化物和铜镍硫化物的分离并不充分。二者共生矿床的形成是由于产于造山带造山后的伸展环境,而不是大陆边缘环境。矿床形成受大洋俯冲的流体作用,并且后期有一期热液的叠加。成矿预测方面,重点围绕白相沟一带铜异常进行,孤山子岩体与北西侧NE向断层分布区是另一预测重点,除铜、铁外,也应注意金的找矿潜力。
[Abstract]:The Gushanzi Cu-Ni-ilmenite deposit is located in Kuancheng County, Chengde City, Hebei Province. The basic-ultrabasic rock bodies in Gushanzi are mainly composed of pyroxenite and hornblende. The types of rock assemblages are in the transition of Cu-Ni sulphide deposit and titanium-iron oxide deposit. The source rocks of the Gushanzi rock body originated from the partial melting of the metasomatic mantle modified by subduction and mixed with a small amount of crustal materials during the magma rise. The emplacement age of the Gushanzi rock body is 275Ma 卤, and the tectonic setting of diagenetic and metallogenic structure is a hydrothermal superimposed metallogenic event in the area of 54 Ma 卤during the post-oceanic collision in Paleo-Asia. The metallogenic process and genetic types of the Gushanzi deposit are very complicated and different types of deposits are formed from early to late. The late Hercynian magma crystallization differentiation formed magmatic stratification deposit, which mainly formed titanium-iron oxide deposit. Magmatic melt deposit was formed by magmatic melt mineralization, mainly copper nickel sulfide deposit. In the early Eocene, there was a phase of hydrothermal superposition metallogenic event. Generally speaking, magmatic type copper-nickel deposits associated with basic-ultrabasic rock bodies cannot be associated with ilmenite deposits. The reason for the symbiotic relationship between copper and nickel deposits in Gushanzi and ilmenite may be the violent magma activity and evolution, but the separation of iron titanate and copper nickel sulfide is not sufficient. The formation of the coore-deposits is due to the extensional environment after orogenic belt rather than the continental margin environment. The deposit was formed by oceanic subduction, and there was a superposition of hydrothermal solution in the later stage. In the aspect of metallogenic prediction, the copper anomaly in Baixianggou area is focused on, and the distribution area of NE trending faults in Gushanzi rock body and northwestern side is another important point. In addition to copper and iron, attention should also be paid to the prospecting potential of gold.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.2

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