DOI: 10.1007/s00531-014-1005-x
Scopus记录号: 2-s2.0-84900014756
论文题名: Metasomatism of ferroan granites in the northern Aravalli orogen, NW India: Geochemical and isotopic constraints, and its metallogenic significance
作者: Kaur P. ; Chaudhri N. ; Hofmann A.W. ; Raczek I. ; Okrusch M. ; Skora S. ; Koepke J.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 4 起始页码: 1083
结束页码: 1112
语种: 英语
英文关键词: Albitisation
; Aravalli orogen
; Ferroan granites
; IOCG metallogeny
; Khetri complex
; Metasomatism
; NW India
Scopus关键词: albitization
; copper
; gold
; granite
; iron oxide
; metallogenesis
; metasomatism
; mineral deposit
; mineralization
; Proterozoic
; Aravalli Range
; India
; Rajasthan
英文摘要: The late Palaeoproterozoic (1.72-1.70 Ga) ferroan granites of the Khetri complex, northern Aravalli orogen, NW India, were extensively metasomatised ~900 Ma after their emplacement, at around 850-830 Ma by low-temperature (ca. 400 °C) meteoric fluids that attained metamorphic character after exchanging oxygen with the surrounding metamorphic rocks. Albitisation is the dominant metasomatic process that was accompanied by Mg and Ca metasomatism. A two-stage metasomatic model is applicable to all the altered ferroan intrusives. The stage I is represented by a metasomatic reaction interface that developed as a result of transformation of the original microcline-oligoclase (An12-14) granite to microcline-albite (An1-3) granite, and this stage is rarely preserved. In contrast, the stage II metasomatic reaction front, where the microcline-bearing albite granite has been transformed to microcline-free albite granite, is readily recognisable in the field and present in most of the intrusives. Some of them lack an obvious reaction interface due to the presence of stage II albite granites only. When studied in isolation, these intrusives were incorrectly classified and their tectonic setting was misinterpreted. Furthermore, our results show that the mafic mineralogy of metasomatised granites has a significant impact on the characterisation of such rocks in the magmatic classification and discrimination diagrams. Nevertheless, the stage I metasomatised granites can be appropriately characterised in these diagrams, whereas the characterisation of the stage II granites will lead to erroneous interpretations. The close spatial association of these high heat producing ferroan granites with iron oxide-copper-gold (IOCG), U and REE mineralisation in the region indicates a genetic link between the metasomatism and the mineralisation. World-class IOCG, U and REE deposits are associated with metasomatised ferroan granites, suggesting that such a relationship may act as a critical first-order exploration target for undiscovered mineral deposits. © 2014 Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84900014756&doi=10.1007%2fs00531-014-1005-x&partnerID=40&md5=4e023c8b71fbd8458abb290847b1ddc0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70392
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Centre of Advanced Study in Geology, Panjab University, Chandigarh, 160 014, India; Max-Planck-Institut für Chemie, Postfach 3060, 55020 Mainz, Germany; Lehrstuhl für Geodynamik und Geomaterialforschung, Institut für Geographie und Geologie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany; Institute of Mineralogy and Geochemistry, University of Lausanne, 1015 Lausanne, Switzerland; School of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS81JP, United Kingdom; Institut für Mineralogie, Leibniz Universität Hannover, Callinstr. 3, 30167 Hannover, Germany
Recommended Citation:
Kaur P.,Chaudhri N.,Hofmann A.W.,et al. Metasomatism of ferroan granites in the northern Aravalli orogen, NW India: Geochemical and isotopic constraints, and its metallogenic significance[J]. International Journal of Earth Sciences,2014-01-01,103(4)