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Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes
Cao, Mingjian1,2,3; Evans, Noreen J.3; Reddy, Steven M.3,4; Fougerouse, Denis3,4; Hollings, Pete5; Saxey, David W.4; McInnes, Brent I. A.3; Cooke, David R.6; McDonald, Bradley J.3; Qin, Kezhang1,2
2019-03-01
Source PublicationAMERICAN MINERALOGIST
ISSN0003-004X
Volume104Issue:3Pages:391-402
AbstractTextural and compositional microscale (10-100 mu m) and nanoscale (10-100 nm) zoning in a plagioclase phenocryst from a fresh, syn-mineralization diorite porphyry (Black Mountain porphyry Cu-Au deposit, Philippines) was characterized for major and trace elements using electron microprobe, laser ablation-inductively coupled plasma-mass spectrometry, and atom probe tomography. The complex plagioclase crystal (3.0 x 5.4 mm) has a patchy andesine core (An(41-48) mol%), eroded bytownite mantle (An(71-80) mol%), and oscillatory andesine rim (An(39-51) mol%). Microscale variations with a periodic width of 50 to 200 mu m were noted for most major and trace elements (Si, Ca, Al, Na, K, Fe, Mg, Ti, Sr, Ba, Pb, La, Ce, and Pr) with a Delta An amplitude of 4-12 mol% in both the core and rim. The mantle has a distinct elemental composition, indicating the addition of hotter mafic magma to the andesitic magma. Atom probe tomography shows an absence of nanoscale variations in the andesine rim but alternating nanoscale (25-30 nm) Al-rich, Ca-rich, and Si-rich, Na-rich zones with a Ca/(Ca+Na)(at%) amplitude of similar to 10 in the bytownite mantle. The restricted variations in physiochemical parameters (H2O-rich, T = 865 to 895 degrees C, P = 5.3 to 6.2 kbar; f(O2) = NNO+0.6 to NNO+1.1 recorded by co-precipitated amphibole) suggest microscale oscillatory zoning was likely controlled by internal crystal growth mechanisms, and not by periodic variations in physiochemical conditions. However, the uniform diffusion timescale for CaAl-NaSi interdiffusion in the mantle is far shorter than the crystallization timescale of the grain from mantle to rim, suggesting nanoscale zonation in the bytownite mantle formed by exsolution after crystallization. The occurrence of micro-scale zoning in plagioclase indicates a minimum cooling rate of 0.0005 degrees C/yr during crystallization, assuming an initial temperature of 880 degrees C, the width of 50 mu m, and NaSi-CaAl interdiffusion under hydrous conditions. Assuming a formation temperature of similar to 675 degrees C for the nanoscale exsolution texture as constrained by zircon crystallization temperatures, the retention of nanoscale zoning (similar to 28 nm) requires a minimum cooling rate of 0.26 degrees C/yr. Given that this is significantly faster cooling than would occur in a magma chamber, this texture likely records the post-crystallization emplacement history.
KeywordAtom probe tomography plagioclase zonation microscale nanoscale Black Mountain porphyry Cu deposit Philippines
DOI10.2138/am-2019-6609
Funding OrganizationNational Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program
WOS KeywordATOM-PROBE TOMOGRAPHY ; BAGUIO DISTRICT ; PARTITION-COEFFICIENTS ; MELT EQUILIBRIA ; PHILIPPINES ; EVOLUTION ; ZIRCON ; DECOMPOSITION ; DIFFUSION ; FELDSPARS
Language英语
Funding ProjectNational Key Research and Development Plan[2017YFC0601306] ; National Natural Sciences Foundation of China[41672090] ; Youth Innovation Promotion Association CAS[2018086] ; Australian Geophysical Observing System grant ; CSIRO ; Curtin University ; University of Western Australia ; Science and Industry Endowment Fund[SIEF RI13-01] ; AQ44 Australian Education Investment Fund program
Funding OrganizationNational Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program ; National Key Research and Development Plan ; National Key Research and Development Plan ; National Natural Sciences Foundation of China ; National Natural Sciences Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Australian Geophysical Observing System grant ; Australian Geophysical Observing System grant ; CSIRO ; CSIRO ; Curtin University ; Curtin University ; University of Western Australia ; University of Western Australia ; Science and Industry Endowment Fund ; Science and Industry Endowment Fund ; AQ44 Australian Education Investment Fund program ; AQ44 Australian Education Investment Fund program
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000460113200007
PublisherMINERALOGICAL SOC AMER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90892
Collection矿产资源研究院重点实验室
Corresponding AuthorCao, Mingjian
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Curtin Univ, Sch Earth & Planetary Sci, John de Laeter Ctr, TIGeR, Perth, WA 6945, Australia
4.Curtin Univ, John de Laeter Ctr, Geosci Atom Probe, Adv Resource Characterisat Facil, GPO Box U1987, Perth, WA 6845, Australia
5.Lakehead Univ, Geol Dept, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
6.Univ Tasmania, Ctr Ore Deposit & Explorat Sci, ARC Res Hub Transforming Min Value Chain & CODES, Private Bag 126, Hobart, Tas 7001, Australia
Recommended Citation
GB/T 7714
Cao, Mingjian,Evans, Noreen J.,Reddy, Steven M.,et al. Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes[J]. AMERICAN MINERALOGIST,2019,104(3):391-402.
APA Cao, Mingjian.,Evans, Noreen J..,Reddy, Steven M..,Fougerouse, Denis.,Hollings, Pete.,...&Qin, Kezhang.(2019).Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes.AMERICAN MINERALOGIST,104(3),391-402.
MLA Cao, Mingjian,et al."Micro- and nano-scale textural and compositional zonation in plagioclase at the Black Mountain porphyry Cu deposit: Implications for magmatic processes".AMERICAN MINERALOGIST 104.3(2019):391-402.
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