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Petrogenesis of ore-bearing porphyry in non-subduction setting: a case study of the Eocene potassic intrusions in the western Yangtze Block
Liu, Zheng1,2; Liao, Shi-Yong3; Zhou, Qing4; Zhang, Xin2
2018-12-01
Source PublicationMINERALOGY AND PETROLOGY
ISSN0930-0708
Volume112Issue:6Pages:801-817
Abstract

In the western Yangtze Block, abundant Eocene (similar to 38-34 Ma) potassic adakite-like intrusions and associated porphyry copper deposits are exposed in non-subduction setting, including Machangjing, Beiya, Binchuan, Habo and Tongchang intrusions. All these ore-bearing porphyries share many geochemical characteristics of adakite such as depletion in heavy rare earth elements (HREEs), enrichment in Sr and Ba, absence of negative Eu anomalies, high SiO2, Al2O3, Sr/Y, La/Yb and low Y, Yb contents. They also exhibit affinities of potassic rocks, e.g., alkali-rich, high K2O/Na2O ratios and enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs). Their Sr-Nd isotopic ratios are similar to coeval shoshonitic lamprophyres. Geochemical data indicate that they were probably produced by partial melting of newly underplated potassic rocks sourced from a modified and enriched lithospheric mantle. These underplated rocks have elevated oxygen fugacity, water and copper contents, with high metallogenic potential. We propose that all the studied potassic rocks were emplaced in a post-collisional setting, associated with the local removal of lithospheric mantle.

KeywordPotassic rocks Lithospheric mantle Porphyry copper deposit Eocene Western Yangtze
DOI10.1007/s00710-018-0597-4
WOS KeywordTIBETAN PLATEAU IMPLICATIONS ; LOWER CONTINENTAL-CRUST ; RIVER SHEAR ZONE ; MO-AU DEPOSIT ; SR-ND-PB ; YUNNAN PROVINCE ; SOUTH CHINA ; COPPER MINERALIZATION ; SOUTHWESTERN CHINA ; U-PB
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000450530700004
PublisherSPRINGER WIEN
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/20867
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, Zheng
Affiliation1.Yunnan Univ, Sch Resource Environm & Earth Sci, 2 Cuihuabei Rd, Kunming 650091, Yunnan, Peoples R China
2.Lanzhou Univ, Sch Earth Sci, Gansu Key Lab Mineral Resources Western China, Lanzhou 730000, Gansu, Peoples R China
3.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Chengdu Inst Geol & Mineral Resources, Chengdu 610081, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Liu, Zheng,Liao, Shi-Yong,Zhou, Qing,et al. Petrogenesis of ore-bearing porphyry in non-subduction setting: a case study of the Eocene potassic intrusions in the western Yangtze Block[J]. MINERALOGY AND PETROLOGY,2018,112(6):801-817.
APA Liu, Zheng,Liao, Shi-Yong,Zhou, Qing,&Zhang, Xin.(2018).Petrogenesis of ore-bearing porphyry in non-subduction setting: a case study of the Eocene potassic intrusions in the western Yangtze Block.MINERALOGY AND PETROLOGY,112(6),801-817.
MLA Liu, Zheng,et al."Petrogenesis of ore-bearing porphyry in non-subduction setting: a case study of the Eocene potassic intrusions in the western Yangtze Block".MINERALOGY AND PETROLOGY 112.6(2018):801-817.
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