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The Altered Mineral Assemblage Research in Jiama Porphyry-skarn copper deposit

Author: GuoNa
Tutor: GuoKe
School: Chengdu University of Technology
Course: Earth Exploration and Information Technology
Keywords: hyperspectral shortwave infrared technology altered mineralassemblage Jiama porphyry-skarn copper deposit
CLC: P618.41
Type: PhD thesis
Year: 2012
Downloads: 68
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Abstract


Recently, high frequency wave infrared technology has been applied to mineprocessing and metallurgy, which has more than twenty years history on geologicalsurvey and prospecting. The core of this technology is making sure the differentmineral types, through altered minerals O-H radical vibrating with strong and weakor interval change triggered in high frequency wave infrared interval. Therefore,Hyperspectral high frequency wave infrared technology has accumulated some canbe used for successful reference on geology application in abroad, but it still stay onunderway stage in china. Hyperspectral high frequency wave infrared technology justhas been applied on altered minerals identifying and mapping, while analyzing alteredmineral assemblage to conduct the metallogenic prediction is not yet have a greatprocess. Hyperspectral high frequency wave infrared technology which used in TibetJia Ma porphyry-skarn copper deposit has been chosen as the research object in thispaper is that we obtained twenty-nine thousand two hundred and fifty curve ofspectrum by measuring forty-eight boring-cores and seventeen thousands one hundredand ninety-one rock samples. Carry out the research on altered mineral assemblage,building the high frequency wave prospecting model. The author use 《The alteredmineral assemblage research in Jiama porphyry-skarn copper deposit—based onHyperspectral high frequency wave infrared technology》as doctoral dissertation tittle, because of a mass of spectroscopic data analysis and altered mineral assemblagefeatures research, then obtain conclusions as follows:1.By high frequency wave infrared technology, distinguishing various alteredmineral, and make a system conclusion and research on altered mineral assemblagefeatures, then divided the altered mineral belt.(1) there are17kinds of altered mineralin drill core include: paragonite, muscovite, phengite, daphnite, Fe-Mg chlorite,amesite, epidote, gypsum, biotite, montmorillonite, tourmaline, kaolinite, topaz,jarosite, illite and calcite etc. from SW to NE, and superficial part to deep part that ispropylitization→potash feldspathization overlying with argillization, they all show themulti-magma emplacement. mineral assemblage are:｛（paragonite is the most, a littlemuscovite）+（a large number of daphnite, a little Fe-Mg chlorite）+calcite｝→｛muscovite+Fe-Mg chlorite+biotite+a little gypsum+the kaolinite with lowcrystallization extent）+calcite｝→｛(muscovite, phengite）+（Fe-Mg chlorite+amesite）+a large number of biotite+kaolinite+dickite+topaz+gypsum+calcite｝→｛（muscovite, phengite）+a small number of amesite+epidote+a large number ofbiotite+（kaolinite with high crystallization extent）+montmorillonite+gypsum+jarosite+tourmaline+illite-muscovite+calcite｝→｛（muscovite+phengite）+（kaolinitewith high crystallization extent）+montmorillonite+gypsum+illite-muscovite｝.(2)there are10samples in1:10000altered mineral, they are include paragonite,muscovite, daphnite, Fe-Mg chlorite, amesite, kaolinite, epidote, pyrophyllite, calciteetc.from north par to XiangBei mountain about two kilometers appeared（paragonite+daphnite）→（muscovite+Fe-Mg chlorite+epidote+pyrophyllite+calcite）→（phengite+amesite+epidote+pyrophyllite+calcite）is a circle distributioncharacteristics with ecto-entad.2. According to altered mineral assemblage change deduced that the deepporphyry location in Jia Ma porphyry-skarn copper deposit is near the north ofZK2420-ZK2871. It can indicated that the altered mineral assemblage in deepporphyry location is phengite+kaolinite with high extent+montmorillonite+biotite+gypsum+jarosite+illite-muscovite. With the temperature rising, Al is reducing inmuscovite, and chlorite as the ambient altered mineral that the Mg is increasing, butapproach to the deep porphyry location will not have Chlorite mineral, with thekaolinite crystallization extent increasing,the obvious products appearing in potassiczone these are gypsum+biotite.3.By analyzing the relationship between ore body and altered mineralassemblage, the thickness of ore body and quantity of argillization altered mineral kaolinite and montmorillonite have positive correlativity. Metallogenic process hasmulti-stages magmatic emplacements, lead to argillization overlying on theberesitization, it is very important to find mine in periphery,because ofkaolinite+montmorillonite advanced argillization altered mineral is the importantindication for finding concealed ore body.4.Combining with1:10000Rock geochemical survey,1:10000high-precisionmagnetic survey,building multielement ore prospecting model.By geology test andverify,confirming that prospecting model is effectiveness and practical applicabilityThe main Innovations:1.By buliding high frequency wave infrared technology altered mineralassemblage and alteration zone exploration model to make sure mineralization zoningand alteration zoning relationship,from this can deduce the deep of Jia Ma porphyry-skarn copper deposit.2.Enclosing multi-prospective areas,put forward the new cognition is the hiddenporphyry rock mass in deep.3.The wavelength change indicates the content of Al in muscovite.The alternantchange of muscovite’s wavelength evident the magma intrusion periods.From the14drillholes close to heat source, it can be at least5periods magma intrusion.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals > Copper
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