Phenocryst Zonation in Porphyry-Related Rocks of the Baguio District, Philippines: Evidence for Magmatic and Metallogenic Processes

doi:10.1093/petrology/egy046

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Phenocryst Zonation in Porphyry-Related Rocks of the Baguio District, Philippines: Evidence for Magmatic and Metallogenic Processes
	Cao, MingJian 1,2,3; Evans, Noreen J.3; Hollings, Pete 4; Cooke, David R.5; McInnes, Brent I. A.3; Qin, KeZhang 1,2; Li, GuangMing 1,2
刊名	JOURNAL OF PETROLOGY
	2018-05-01
卷号	59 期号:5 页码:825-847
关键词	magmatic process mineral zonation porphyry Cu deposit systems Baguio district
ISSN号	0022-3530
DOI	10.1093/petrology/egy046
文献子类	Article
英文摘要	Mantle-derived mafic magmas may be the source of ore-forming metals in large Cu porphyry systems, but evidence of primary petrogenetic and metallogenetic processes can be masked by hydrothermal alteration. The Baguio district of Northern Luzon, Philippines is a world-class mineral province containing approximately 40 Moz of gold and 5 Mt of copper, distributed across many porphyry Cu and epithermal Au deposit systems which are spatially related to Pliocene pre-ore Liw-Liw Creek (LCC) basaltic dikes (3.59-4.73 Ma) and a syn-ore plagioclase-hornblende diorite porphyry (2.81-2.98 Ma). A range of phenocryst phases (plagioclase, amphibole and clinopyroxene) are well preserved in both the basaltic dike suite and diorite porphyry suite, and provide an excellent natural laboratory to investigate magmatic processes and the relationship between metallogenesis and mafic magma. Widespread normally zoned clinopyroxene and amphibole grains in the basaltic dike suite show sharp decreases in Mg#, but increasing Mn, Sr, Cu, Y, Zr and REE from core to rim. Mixing of evolved felsic magma into the mafic magma is the most likely cause of these trends as fractional crystallization would typically result in gradual variations. In the diorite porphyry suite, reversely zoned amphibole is characterised by sharp increases in Mg#, Cu and Ni, but decreasing Mn, while oscillatory zoned plagioclase with distinct regions of patchy zonation shows repeated variations of An, Mg, Fe and Sr from core to rim. These signatures indicate the addition of basaltic magma to the diorite porphyry magma. The modeled Mg# of the melts (estimated assuming mineral-melt equilibrium) is also consistent with magma mixing. For example, the high Mg# of 66-72 and low Mg# of 38-44 estimated from the LLC clinopyroxene cores and rims, respectively, support the presence of basaltic magma, mixed with evolved felsic magma. All normally zoned clinopyroxene and amphibole in the basaltic dike suite and reversely zoned amphibole in the diorite porphyry suite show consistent increases in Cu from core to rim, suggesting relative enrichment of Cu in both types of injected magma. The pre-ore basaltic and ore-forming dioritic hybrid melts are estimated to have contained 45-96ppm and 319-351ppm Cu, respectively, based on Cu partition coefficients and zone area percentage. The Cu content of the basaltic hybrid melt is typical of arc magmas (Cu 50-100 ppm), whereas the Cu in the dioritic melt was 3-6 times higher than typical arcs magma. Both the clinopyroxene-melt thermobarometer and Al-in-hornblende geobarometer indicate similar crystallization pressures for both suites (8.6 similar to 8.8, 4.4 similar to 4.7, 2.1 similar to 2.8 kbar), suggesting that both pre-ore basaltic and syn-ore dioritic suites formed in different magma chambers at similar depths. The addition of Cu enriched mafic magma may contribute ore-forming elements to the mineralising magmas and significantly increase the mineralization potential of coeval felsic rocks. Studies of phenocrysts have the potential to elucidate the role of magmatic process in the formation of porphyry systems and allow for the recognization of the key characteristics of fertile magmatic systems.
WOS关键词	OXIDATION-STATE ; WESTERN JUNGGAR ; TRACE-ELEMENTS ; CU DEPOSIT ; ORE FLUIDS ; PARTITION-COEFFICIENTS ; COPPER MINERALIZATION ; AU MINERALIZATION ; GRANITIC MAGMAS ; VOLCANIC-ROCKS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000440954000002
资助机构	National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; 41672090) ; 41672090) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; 41672090) ; 41672090) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; 41672090) ; 41672090) ; 41672090) ; 41672090) ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; National Natural Sciences Foundation of China(41390444 ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; International Postdoctoral Exchange Fellowship Program of China(20150085) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Youth Innovation Promotion Association CAS(2018086) ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Geophysical Observing System grant by AQ44 Australian Education Investment Fund program ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Australian Mineral Industry Research Association (AMIRA) project(P765) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; Natural Sciences and Engineering Research Council (NSERC) ; 41672090) ; 41672090) ; 41672090) ; 41672090)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88151]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Cao, MingJian
作者单位	1.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, John de Laeter Ctr, Sch Earth & Planetary Sci, Perth, WA, Australia 4.Lakehead Univ, Geol Dept, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada 5.Univ Tasmania, Transforming Min Value Chain, Australian Res Council,Ctr Excellence Ore Deposit, Australia Res Council Ind Transformat Res Hub, Hobart, Tas 7001, Australia
推荐引用方式 GB/T 7714	Cao, MingJian,Evans, Noreen J.,Hollings, Pete,et al. Phenocryst Zonation in Porphyry-Related Rocks of the Baguio District, Philippines: Evidence for Magmatic and Metallogenic Processes[J]. JOURNAL OF PETROLOGY,2018,59(5):825-847.
APA	Cao, MingJian.,Evans, Noreen J..,Hollings, Pete.,Cooke, David R..,McInnes, Brent I. A..,...&Li, GuangMing.(2018).Phenocryst Zonation in Porphyry-Related Rocks of the Baguio District, Philippines: Evidence for Magmatic and Metallogenic Processes.JOURNAL OF PETROLOGY,59(5),825-847.
MLA	Cao, MingJian,et al."Phenocryst Zonation in Porphyry-Related Rocks of the Baguio District, Philippines: Evidence for Magmatic and Metallogenic Processes".JOURNAL OF PETROLOGY 59.5(2018):825-847.