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Rapid orthopyroxene growth induced by silica assimilation: constraints from sector-zoned orthopyroxene, olivine oxygen isotopes and trace element variations in the Huangshanxi Ni-Cu deposit, Northwest China
Mao, Ya-Jing1,2; Barnes, Stephen J.3; Qin, Ke-Zhang1,2,4; Tang, Dongmei1,2; Martin, Laure5,6; Su, Benxun1,2,4; Evans, Noreen J.7
2019-04-01
Source PublicationCONTRIBUTIONS TO MINERALOGY AND PETROLOGY
ISSN0010-7999
Volume174Issue:4Pages:24
AbstractThe Permian Huangshanxi Ni-Cu-hosted intrusion, located in the southern Central Asian Orogenic Belt in NW China, is dominated by cumulus olivine and orthopyroxene. Various types of compositional zonings in cumulate phases were studied using high-resolution synchrotron X-Ray fluorescence imaging, electron microprobe, laser ablation inductively coupled plasma mass spectrometry and secondary ion mass spectrometry, to shed light on the relationship between the orthopyroxene-rich cumulate and sulfide accumulation. Normal, oscillatory, and sector zonings of Cr in orthopyroxene from both lherzolites and olivine websterites were noted, likely due to the different cut orientation of orthopyroxene crystals composed of sector-zoned cores and reverse-zoned rims. Significant Fe-Mg-Al-Si variations found in the exterior regions of the grains do not correspond to the Cr zoning. However, Cr content is positively correlated with Ti-Al contents in interior regions of orthopyroxene, reflecting coupled charge substitution during the development of sector zoning, and indicating diffusion-modified Fe-Mg-Al-Si variation in the exterior regions. Primary Cr-sector zoning in the core is likely the result of rapid in situ growth in a boundary layer at the cumulus stage, probably induced by Si addition from wall rocks and crystallization under supersaturated conditions. In addition, some olivine shows Mg-Fe-Mn-Ca-Cr variations in the rim but not in the core, and both core and rim of olivine show a uniform O isotope composition, illustrating that they have not been modified by post-cumulus processes. Given the distinct difference in O isotopic signatures between mantle-derived melts and crustal materials, olivine O isotope composition could be used to decipher the relative degree of Si addition at crystallization. The Fo value, O isotopic signature and trace element content in the cores of olivine grains from different depths show systematic variations, dividing the sulfide-bearing cumulate into two intervals; the lower and upper lherzolite zones with harzburgitic rocks at the contact. In the lower zone, the olivine O-18 values increase upward from6 to7 parts per thousand and the oxygen fugacity decreases from QFM to QFM-2, suggesting increasing contamination by more reduced crustal materials. Over the same interval, the modal proportion of orthopyroxene and modal orthopyroxene/olivine ratio increase with increasing depth with little variation in whole-rock Mg#, clearly illustrating that the non-cotectic orthopyroxene proportions resulted from Si addition from the wall rock. In the upper zone, the decrease in O-18 values, and increase in olivine nucleation density, Fo value and oxygen fugacity suggest there was a pulse of sulfide- and olivine-charged magma into the magma chamber, that mixed with resident magma to form a hybrid bottom layer in contact with the early-crystallized orthopyroxene-rich cumulate pile. The sulfide content decreases up-section in the lower zone, and then increases again towards the top of the cumulate sequence. This, combined with the compositional variations with depth, suggests that sulfides in the Huangshanxi Ni-Cu deposit settled downward during at least two sulfide-loaded magma pulses. The fast-growing orthopyroxene-rich cumulate may have acted as a permeability barrier, preventing sulfide percolation into the lower cumulate formed during the first magma pulse. Overall, sector zoning in orthopyroxene and compositional variations in olivine suggest that Si and reduced material addition during contamination is of great importance in forming magmatic Ni-Cu deposits hosted by olivine- and orthopyroxene-dominated intrusions.
KeywordHuangshanxi magmatic Ni-Cu deposit Orthopyroxene sector zoning Olivine oxygen isotopes Contamination Oxygen fugacity Crystal size distribution
DOI10.1007/s00410-019-1574-6
Funding OrganizationNature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program
WOS KeywordCRYSTAL SIZE DISTRIBUTIONS ; MAFIC-ULTRAMAFIC INTRUSION ; SULFIDE DEPOSIT ; GEOCHEMICAL CONSTRAINTS ; DIFFUSION-COEFFICIENTS ; EASTERN TIANSHAN ; MINOR-ELEMENT ; PETROGENESIS ; XINJIANG ; FE
Language英语
Funding ProjectNature Science Foundation of China[41872094] ; Nature Science Foundation of China[41830430] ; Nature Science Foundation of China[41472075] ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program
Funding OrganizationNature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Nature Science Foundation of China ; Nature Science Foundation of China ; CSIRO Research Plus Science Leader program ; CSIRO Research Plus Science Leader program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by the AQ44 Australian Education Investment Fund program
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000465936700001
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/91388
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Univ Western Australia, ARC Ctr Excellence Core Crust Fluid Syst, Perth, WA 6009, Australia
6.Univ Western Australia, Ctr Microscopy Characterizat & Anal, Perth, WA 6009, Australia
7.Curtin Univ, Sch Earth & Planetary Sci, John de Laeter Ctr, Perth, WA 6151, Australia
Recommended Citation
GB/T 7714
Mao, Ya-Jing,Barnes, Stephen J.,Qin, Ke-Zhang,et al. Rapid orthopyroxene growth induced by silica assimilation: constraints from sector-zoned orthopyroxene, olivine oxygen isotopes and trace element variations in the Huangshanxi Ni-Cu deposit, Northwest China[J]. CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,2019,174(4):24.
APA Mao, Ya-Jing.,Barnes, Stephen J..,Qin, Ke-Zhang.,Tang, Dongmei.,Martin, Laure.,...&Evans, Noreen J..(2019).Rapid orthopyroxene growth induced by silica assimilation: constraints from sector-zoned orthopyroxene, olivine oxygen isotopes and trace element variations in the Huangshanxi Ni-Cu deposit, Northwest China.CONTRIBUTIONS TO MINERALOGY AND PETROLOGY,174(4),24.
MLA Mao, Ya-Jing,et al."Rapid orthopyroxene growth induced by silica assimilation: constraints from sector-zoned orthopyroxene, olivine oxygen isotopes and trace element variations in the Huangshanxi Ni-Cu deposit, Northwest China".CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 174.4(2019):24.
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