云南省香格里拉春都铜矿区斑岩体岩石地球化学特征及成岩机理研究
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摘要
论文在《云南省香格里拉春都斑岩铜矿床成矿规律研究》项目的资助下完成。春都斑岩铜矿床地处著名的印支期中甸-义敦岛弧成矿带南端。本文在充分了解区域地质背景、矿区及矿床地质特征的基础上,主要通过春都矿区侵入岩岩石学特征的研究,对区内围岩蚀变及矿化特征进行了分析,查明了围岩蚀变与矿化之间的关系。同时通过侵入岩主量、微量、稀土元素地球化学特征,以及同位素年代学的研究,对春都斑岩体的成岩构造环境、物质来源、岩浆演化、成岩温度和压力等进行了探讨,并初步建立了成岩模式,为春都斑岩铜矿床成矿规律的研究奠定了基础。本文主要取得以下认识：
矿区围岩蚀变强烈,区内围岩蚀变分带较明显,铜矿主要产出于硅化钾化带,以及蚀变较强的硅化黑云母化带、硅化带和绢英岩化带,其余蚀变带中矿化微弱。蚀变与矿化关系密切,蚀变类型决定矿化程度,蚀变带分布控制矿体产状,沿走向NW、倾向NE的硅化钾化带,是矿区重要的找矿靶区。
矿区主要岩石类型为闪长玢岩,还有花岗闪长斑岩、安山质火山角砾岩等。矿区主要岩石类型为闪长玢岩和花岗闪长斑岩。二者的主量元素与中国闪长玢岩、花岗闪长斑岩相近,属于钙碱性系列,微量元素均富集大离子亲石元素Sr、K、Rb、Ba、Th,相对亏损高场强元素Ta、Nb、P、Hf、Ti,稀土元素为轻稀土富集型。闪长玢岩的形成早于花岗闪长斑岩,二者均为印支期产物。
二者形成的环境均为俯冲环境,春都闪长玢岩的岩浆演化过程主要受结晶分异作用控制；花岗闪长斑岩的岩浆演化过程受部分熔融和分离结晶作用同时控制。二者具有结晶分异演化关系,是同源岩浆房,但初始岩浆受到的部分熔融程度不同而形成,属于同源异相的产物。春都侵入岩均显示埃达克岩特征,表明春都侵入岩具有埃达克质岩的特征,反映了春都矿区具有埃达克质岩成矿的特征,具有良好的找矿前景。
春都闪长玢岩、花岗闪长斑岩是甘孜-理塘洋壳向西俯冲作用下形成的原始岩浆在不断演化过程中,岩浆演化晚期不同时间不同成分岩浆的产物。闪长玢岩形成后,春都底部的安山质岩浆已经演化至英安质岩浆,并沿着闪长玢岩底部的构造薄弱带上侵进入闪长玢岩体内形成春都花岗闪长斑岩。
The completion of my thesis was subsidized by project of mineralization regularity study of Chundu porphyry copper deposit, Xianggelila,Yunnan. The Chundu porphyry copper deposit lies in the southern of famous Zhongdian-Yidun arc orogen.The thesis find out the relation of mineralization and alteration by analysing the feature of mineralization and wall rock alteration.The analysis by researching the petrological feature of intrusive rock in Chundu orefield that based on learning about regional geological background,geologic feature of orefield and deposit.The mode of petrosal formation was established preliminary by exploring surroundings of plate tectonics when rock was formed,source of material of rock, evolution of magma and temperature and pressure force when rock was produced.The exploring was based on the study of the geochemical feature of major element,microelement,rare earth elements and chronology of isotope.The mode is foundation that research mineralization regularity Chundu copper ore deposit.The main cognition from the thesis is:
There are fierce alteration of wall rock and visible zonality of alteration in the orefield surrounding the metallogenic rock mass.The copper mine is major distribution in kali silicification zone, silicification and biotitization zone, silification zone and sericitolite zone.There are little copper mine in other zone.The connection of alteration and mineralization is close.The level of mineralization are decided by the types of alteration and the production situation of orebody are conditioned by the distribution of alteration zone.The kali silicification zone that trended to NW and sloped to NE is important targetvolume that prospecting mine in orefield.
The diorite porphyrite and granodiorite-porphyry are major intrusive rock in the Chundu orefield.Their content of oxides are close to approximate Chinese diorite porphyrite and Chinese granodiorite-porphyry.They all belong to calc-alkali magma series.Their LLE for example Sr、K、Rb、Ba、Th are enriched and HFSE for example Ta、N、P、Hf、Ti are deficit. The chondrite's standardized diagram of intrusive rock in Chundu belong to LREE enriched type.The diorite porphyrite's age is older than the granodiorite-porphyry in Chundu. They were produced in Indo-Chinese epoch.
The intrusive rock in Chundu were made indowngoing tectonic setting.It was controlled by crystallization differentiation that the evolutionary process of diorite porphyrite's magma.And it was jointly controlled by crystallization differentiation and partially fusion that the evolutionary process of granodiorite-porphyry's magma.Both rock are came from same magma but was produced in different stage of magmatic evolution.That is proved that differentiation level of intrusive rock in Chundu that is neutral-acidity rock series.The intrusive rock in Chundu is in the nature of adakites.It reflect that there are mineralize feature of adakitic rocks and prospecting foreground in orefield in Chundu.
The diorite porphyrite and granodiorite-porphyry are products from constantly tachytely magma of different component and produced in different times when Ganzi-Litang oceanic lithosphere subduct to west. After time that produced diorite porphyrite when andesite-basalt magma evolved into dacite magma,the granodiorite-porphyryIt was produced through the dacite magma intruded on vulnerable zone on the bottom of diorite porphyrite mass.
矿区围岩蚀变强烈,区内围岩蚀变分带较明显,铜矿主要产出于硅化钾化带,以及蚀变较强的硅化黑云母化带、硅化带和绢英岩化带,其余蚀变带中矿化微弱。蚀变与矿化关系密切,蚀变类型决定矿化程度,蚀变带分布控制矿体产状,沿走向NW、倾向NE的硅化钾化带,是矿区重要的找矿靶区。
矿区主要岩石类型为闪长玢岩,还有花岗闪长斑岩、安山质火山角砾岩等。矿区主要岩石类型为闪长玢岩和花岗闪长斑岩。二者的主量元素与中国闪长玢岩、花岗闪长斑岩相近,属于钙碱性系列,微量元素均富集大离子亲石元素Sr、K、Rb、Ba、Th,相对亏损高场强元素Ta、Nb、P、Hf、Ti,稀土元素为轻稀土富集型。闪长玢岩的形成早于花岗闪长斑岩,二者均为印支期产物。
二者形成的环境均为俯冲环境,春都闪长玢岩的岩浆演化过程主要受结晶分异作用控制；花岗闪长斑岩的岩浆演化过程受部分熔融和分离结晶作用同时控制。二者具有结晶分异演化关系,是同源岩浆房,但初始岩浆受到的部分熔融程度不同而形成,属于同源异相的产物。春都侵入岩均显示埃达克岩特征,表明春都侵入岩具有埃达克质岩的特征,反映了春都矿区具有埃达克质岩成矿的特征,具有良好的找矿前景。
春都闪长玢岩、花岗闪长斑岩是甘孜-理塘洋壳向西俯冲作用下形成的原始岩浆在不断演化过程中,岩浆演化晚期不同时间不同成分岩浆的产物。闪长玢岩形成后,春都底部的安山质岩浆已经演化至英安质岩浆,并沿着闪长玢岩底部的构造薄弱带上侵进入闪长玢岩体内形成春都花岗闪长斑岩。
The completion of my thesis was subsidized by project of mineralization regularity study of Chundu porphyry copper deposit, Xianggelila,Yunnan. The Chundu porphyry copper deposit lies in the southern of famous Zhongdian-Yidun arc orogen.The thesis find out the relation of mineralization and alteration by analysing the feature of mineralization and wall rock alteration.The analysis by researching the petrological feature of intrusive rock in Chundu orefield that based on learning about regional geological background,geologic feature of orefield and deposit.The mode of petrosal formation was established preliminary by exploring surroundings of plate tectonics when rock was formed,source of material of rock, evolution of magma and temperature and pressure force when rock was produced.The exploring was based on the study of the geochemical feature of major element,microelement,rare earth elements and chronology of isotope.The mode is foundation that research mineralization regularity Chundu copper ore deposit.The main cognition from the thesis is:
There are fierce alteration of wall rock and visible zonality of alteration in the orefield surrounding the metallogenic rock mass.The copper mine is major distribution in kali silicification zone, silicification and biotitization zone, silification zone and sericitolite zone.There are little copper mine in other zone.The connection of alteration and mineralization is close.The level of mineralization are decided by the types of alteration and the production situation of orebody are conditioned by the distribution of alteration zone.The kali silicification zone that trended to NW and sloped to NE is important targetvolume that prospecting mine in orefield.
The diorite porphyrite and granodiorite-porphyry are major intrusive rock in the Chundu orefield.Their content of oxides are close to approximate Chinese diorite porphyrite and Chinese granodiorite-porphyry.They all belong to calc-alkali magma series.Their LLE for example Sr、K、Rb、Ba、Th are enriched and HFSE for example Ta、N、P、Hf、Ti are deficit. The chondrite's standardized diagram of intrusive rock in Chundu belong to LREE enriched type.The diorite porphyrite's age is older than the granodiorite-porphyry in Chundu. They were produced in Indo-Chinese epoch.
The intrusive rock in Chundu were made indowngoing tectonic setting.It was controlled by crystallization differentiation that the evolutionary process of diorite porphyrite's magma.And it was jointly controlled by crystallization differentiation and partially fusion that the evolutionary process of granodiorite-porphyry's magma.Both rock are came from same magma but was produced in different stage of magmatic evolution.That is proved that differentiation level of intrusive rock in Chundu that is neutral-acidity rock series.The intrusive rock in Chundu is in the nature of adakites.It reflect that there are mineralize feature of adakitic rocks and prospecting foreground in orefield in Chundu.
The diorite porphyrite and granodiorite-porphyry are products from constantly tachytely magma of different component and produced in different times when Ganzi-Litang oceanic lithosphere subduct to west. After time that produced diorite porphyrite when andesite-basalt magma evolved into dacite magma,the granodiorite-porphyryIt was produced through the dacite magma intruded on vulnerable zone on the bottom of diorite porphyrite mass.
引文
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