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Morphology and Particle Size Distribution of Olivines and Sulphides in the Jinchuan Ni-Cu Sulphide Deposit: Evidence for Sulphide Percolation in a Crystal Mush
Mao, Ya-Jing1,2,3; Barnes, Stephen J.3; Duan, Jun4; Qin, Ke-Zhang1,2,5; Godel, Belinda M.3; Jiao, Jiangang4
2018-09-01
Source PublicationJOURNAL OF PETROLOGY
ISSN0022-3530
Volume59Issue:9Pages:1701-1729
AbstractThe Jinchuan intrusion is the largest single magmatic nickel sulphide deposit in the world. Sulphide mineralization mainly occurs in two segments (I and II). The crystal size distributions (CSDs) of olivines in the two segments are distinctly different. For all olivines in the two segments, their grain sizes and values of the clustering index R increase with increasing olivine abundance in the cumulates, illustrating overgrowth trends for Segment II olivines and a combination of overgrowth and compaction trends for Segment I olivines. Kinked olivine CSDs and compaction trends in the olivine cumulates of Segment I suggest the presence of two olivine populations with different nucleation rates, one of which most probably grew in a deeper chamber and then became entrained in the ascending magma. In contrast, the simple log-linear CSDs of the olivine cumulates of Segment II could be the result of a single nucleation event in the current magma chamber. In both segments, olivine chadacrysts in orthopyroxene and in clinopyroxene oikocrysts show a progression in grain size from small grains in Ti-poor pyroxene cores to larger grains in Ti-rich rims. This strongly suggests simultaneous in situ nucleation and growth of olivine and both pyroxenes at the top of the crystal mush, with the poikilitic textures developing as the result of faster growth of the pyroxenes relative to olivines. Sulphides in both segments, distributed in the pore spaces between cumulus olivines, form interconnected networks on a scale of centimetres, separated by domains poor in sulphide and occupied by oikocrysts and late-crystallizing interstitial silicates. The small sulphide droplets, having equivalent sphere diameters (ESD) between 80 and 400 mu m, are relatively round and show log-linear PSDs, suggesting that they may have nucleated and grown in the mush zones. The irregular morphology and the concave PSDs of the larger sulphide droplets (ESD > 400 mu m) suggest that these sulphides are the result of coalescence. CSDs of olivines in sulphide-poor (similar to 4 vol. % disseminated sulphide) cumulates are indistinguishable from those in sulphide-rich samples (similar to 20 vol. % sulphide, net-textured) for both segments. This, along with other textural observations, suggests that the sulphides in sulphide-rich samples percolated through the pore space of the olivine framework and displaced the interstitial silicate liquid, after significant (40-70%) olivine crystallization. Both wetting and non-wetting textures are observed between the sulphides and surrounding olivine, which suggests the presence of two liquids in the pore space and indicates that the extent of displacement of silicate by sulphide melt is rather more extensive than predicted by theory. These textural results for olivine and sulphides suggest that downward and/or sideward sulphide percolation through the inter-olivine pore space in the mush zone plays a key role in generating the disseminated and net-textured ores in the Jinchuan magmatic Ni-Cu deposit.
KeywordJinchuan magmatic Ni-Cu deposit olivine crystal size distribution crystal mush sulphide morphology sulphide percolation cumulate
DOI10.1093/petrology/egy077
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council
WOS KeywordIN-SITU CRYSTALLIZATION ; RAY COMPUTED-TOMOGRAPHY ; MAGMATIC SULFIDE ; SKAERGAARD INTRUSION ; ULTRAMAFIC INTRUSION ; FIELD RELATIONSHIPS ; OXYGEN BAROMETRY ; SATURATED MAGMAS ; DISTRIBUTION CSD ; WESTERN CHINA
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC0601204] ; Nature Science Foundation of China[41502095] ; Basic Scientific Research of Central Colleges of Chang'an University[310827171007] ; China Postdoctoral Science Foundation[2015M570146] ; Australian Government ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; China Scholarship Council
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Nature Science Foundation of China ; Nature Science Foundation of China ; Basic Scientific Research of Central Colleges of Chang'an University ; Basic Scientific Research of Central Colleges of Chang'an University ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Australian Government ; Australian Government ; Government of Western Australia ; Government of Western Australia ; CSIRO Science Plus Science Leader program ; CSIRO Science Plus Science Leader program ; China Scholarship Council ; China Scholarship Council
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000450289900002
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89436
Collection矿产资源研究院重点实验室
Corresponding AuthorMao, Ya-Jing
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.CSIRO Mineral Resources, Perth, WA 6151, Australia
4.Changan Univ, Sch Earth Sci & Recourses, MOE Key Lab Western Chinas Mineral Resources & Ge, Xian 710054, Shaanxi, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Mao, Ya-Jing,Barnes, Stephen J.,Duan, Jun,et al. Morphology and Particle Size Distribution of Olivines and Sulphides in the Jinchuan Ni-Cu Sulphide Deposit: Evidence for Sulphide Percolation in a Crystal Mush[J]. JOURNAL OF PETROLOGY,2018,59(9):1701-1729.
APA Mao, Ya-Jing,Barnes, Stephen J.,Duan, Jun,Qin, Ke-Zhang,Godel, Belinda M.,&Jiao, Jiangang.(2018).Morphology and Particle Size Distribution of Olivines and Sulphides in the Jinchuan Ni-Cu Sulphide Deposit: Evidence for Sulphide Percolation in a Crystal Mush.JOURNAL OF PETROLOGY,59(9),1701-1729.
MLA Mao, Ya-Jing,et al."Morphology and Particle Size Distribution of Olivines and Sulphides in the Jinchuan Ni-Cu Sulphide Deposit: Evidence for Sulphide Percolation in a Crystal Mush".JOURNAL OF PETROLOGY 59.9(2018):1701-1729.
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