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Two origins of illite at the Dexing porphyry Cu deposit, East China: Implications for ore-forming fluid constraint on illite crystallinity
Jin, ZD; Zhu, JC; Ji, JF; Li, FC; Lu, XW
2002-06-01
Source PublicationCLAYS AND CLAY MINERALS
Volume50Issue:3Pages:381-387
AbstractIllite is a distinctive clay mineral formed by K alteration within hydrothermal alteration zones in porphyry Cu deposits. Based on differences in spatial distribution, Kubler index, number of swelling layers, and polytype, two kinds of illite are recognized within the Dexing porphyry Cu deposit, East China. One is a hydrothermal mineral within hydrothermally-altered granodiorite porphyry and altered tuffaceous phyllite near the contact zone with the granodiorite porphyry cupola. The hydrothermal illite is formed by illitization of plagioclase and/or micas during hydrothermal fluid-rock interaction. The considerable variation of their higher Kubler indices (0.17-1.41 degreesDelta2theta) with swelling layer is affected by fluid/rock ratio or fluid flux. The other type of illite is a product of low-grade metamorphism Within tuffaceous phyllite away from the porphyry cupola (>2 km), and has a lower Kubler index (0.06-0.13 degreesDelta2theta), a 2M(1) polytype, and no swelling layers. We suggest that, within the mineralized alteration zone, the lower the Kubler index, the stronger the degree of alteration, and the higher the copper grade. This is caused by a higher fluid/rock ratio in the middle-upper portions of the contact zone.
SubtypeArticle
KeywordAlteration Hydrothermal Fluid Kubler Index Low-grade Metamorphism Porphyry Cu Deposit
WOS HeadingsScience & Technology ; Physical Sciences ; Life Sciences & Biomedicine
WOS Subject ExtendedChemistry ; Geology ; Mineralogy ; Agriculture
WOS KeywordRAY-DIFFRACTION PATTERNS ; HYDROTHERMAL SYSTEM ; CLAY-MINERALS ; SMECTITE ; TRANSFORMATION ; GEOTHERMOMETER ; TEMPERATURE ; REFLECTANCE ; TRANSITION ; DIAGENESIS
Indexed BySCI
Language英语
WOS SubjectChemistry, Physical ; Geosciences, Multidisciplinary ; Mineralogy ; Soil Science
WOS IDWOS:000176966600011
PublisherCLAY MINERALS SOCIETY
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/68344
Collection中国科学院地理科学与资源研究所
Corresponding AuthorJin, ZD
Affiliation1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Lake Sediment & Environm Lab, Nanjing 210008, Peoples R China
2.Nanjing Univ, Dept Earth Sci, State Key Lab Res Mineral Deposits, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Inst Geog, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Jin, ZD,Zhu, JC,Ji, JF,et al. Two origins of illite at the Dexing porphyry Cu deposit, East China: Implications for ore-forming fluid constraint on illite crystallinity[J]. CLAYS AND CLAY MINERALS,2002,50(3):381-387.
APA Jin, ZD,Zhu, JC,Ji, JF,Li, FC,&Lu, XW.(2002).Two origins of illite at the Dexing porphyry Cu deposit, East China: Implications for ore-forming fluid constraint on illite crystallinity.CLAYS AND CLAY MINERALS,50(3),381-387.
MLA Jin, ZD,et al."Two origins of illite at the Dexing porphyry Cu deposit, East China: Implications for ore-forming fluid constraint on illite crystallinity".CLAYS AND CLAY MINERALS 50.3(2002):381-387.
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