An overview on the origin of adakites/adakitic rocks and related porphyry Cu-Au mineralization, Northern Luzon, Philippines
An overview on the origin of adakites/adakitic rocks and related porphyry Cu-Au mineralization, Northern Luzon, Philippines
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菲律宾吕宋岛北部埃达克岩/埃达克岩成因及相关斑岩铜金矿化概述
DOI：
10.1016/j.oregeorev.2020.103610
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发表时间：
2020-09
影响因子：
3.3
通讯作者：
He Liu
中科院分区：
文献类型：
--
作者：
Jianghong Deng;Xiaoyong Yang;Lipeng Zhang;Liuan Duan;Abdul Shakoor Mastoi;He Liu
菲律宾岛弧以广泛发育的大型斑岩和浅成热液铜金矿床以及伴生的新生代埃达克岩/埃达克岩而闻名。吕宋岛北部是菲律宾铜金最富集的地区之一，在中部科迪勒拉山脉和卡加延谷盆地最南端发育晚渐新世至更新世斑岩矿和浅成热液铜金矿床。本文对吕宋岛北部典型斑岩型和浅成热液型铜金矿床的新生代岩浆事件和地质特征进行了概述和简要总结。重新研究了该地区三个时期岩浆事件的矿化或未矿化火成岩的地球化学数据，以研究不同的成因并揭示与铜金矿化的联系。中部科迪勒拉碧瑶和曼卡延地区的上新世-更新世铜金矿床大多与闪长岩到英安斑岩有关。这些岩石的成分为中间至长英质，显示出“过渡”埃达克岩到典型埃达克岩的特定地球化学特征。它们可能是由于吕宋岛弧下方平坦俯冲的斯卡伯勒海脊在相当浅的深度和低压下部分熔化而产生的。在岩浆演化过程中，它们还经历了一定程度的磷灰石±钛铁矿分馏。这些上新世-更新世斑岩的板片熔融成因导致了中部科迪勒拉地区强烈的铜金矿化。位于卡加延河谷盆地最南端迪迪皮奥地区的晚渐新世丁基迪碱性斑岩铜金矿床与高度演化的丁基迪二长岩-正长岩矿床直接相关，也显示出埃达克质地球化学特征。然而，它并不是直接来自板坯熔化，而是由角闪石 + 磷灰石 ± 单斜辉石 ± 钛矿从碱性玄武质岩浆中组合分步结晶产生。玄武质岩浆可能是由晚渐新世俯冲的南海板块板片回滚引起的弧后裂谷环境中熔融交代地幔的部分熔融产生的。丁基迪矿床主要来源中的板片熔体交代作用与高氧逸度岩浆演化过程中的后期铜-金富集相结合，促进了丁基迪矿床中斑岩铜-金矿化。中央科迪勒拉山脉的早中新世中央科迪勒拉闪长岩杂岩（也称为安戈岩基）显示出明显的角闪石±单斜辉石分馏，从地球化学角度演化而来非埃达克质玄武质岩浆至埃达克质花岗闪长质岩浆。没有与中央科迪勒拉闪长岩杂岩相关的值得注意的斑岩或浅成热液铜-金矿床，主要是因为它们主要源自由有限板片流体交代的富集程度较低的地幔源。中央科迪勒拉闪长岩杂岩的主要来源中最初缺乏铜-金，阻碍了该杂岩的进一步铜-金矿化，尽管它们已经经历了高度的演化。
The Philippine island arc is famous for the widely developed large porphyry and epithermal Cu-Au deposits and associated Cenozoic adakites/adakitic rocks. Northern Luzon is one of the most Cu-Au enriched areas in the Philippines, which develops Late-Oligocene to Pleistocene porphyry and epithermal Cu-Au deposits in the Central Cordillera Range and southernmost of Cagayan Valley Basin. In this paper, Cenozoic magmatic events and geological characteristics of typical porphyry and epithermal Cu-Au deposits in Northern Luzon have been overviewed and briefly summarized. Geochemical data of the mineralized or unmineralized igneous rocks from three period of magma events in the area have been revisited, to investigate the different geneses and reveal the connections to Cu-Au mineralization.The Pliocene-Pleistocene Cu-Au deposits in the Baguio and Mankayan districts of Central Cordillera are mostly related to dioritic to dacitic porphyries. These rocks are intermediate to felsic in compositions, displaying specific geochemical features of “transitional” adakite to typical adakite. They were probably generated by partial melting of the flat-subducted Scarborough Ridge beneath the Luzon Arc at quite shallow depths and low pressures. They also underwent a certain degree of apatite ± ilmenite fractionation during magma evolution. The slab-melting genesis of these Pliocene-Pleistocene porphyries gives rise to the intense Cu-Au mineralization in the Central Cordillera.The Late Oligocene Dinkidi alkalic porphyry Cu-Au deposit in the Didipio area, southernmost Cagayan Valley Basin is directly related to the highly evolved Dinkidi monzonite-syenite stock, which also shows adakitic geochemical features. However, it was not directly derived from slab melting, but generated by combination fractional crystallization of hornblende + apatite ± clinopyroxene ± titanite from an alkalic basaltic magma. The basaltic magma was probably produced by partial melting of a melt-metasomatized mantle in a backarc rift setting caused by slab rollback of the subducted South China Sea plate in the Late Oligocene. Slab melt metasomatism in the primary source of the Dinkidi stock combined with late stage Cu-Au enrichment during magma evolution at high oxygen fugacities facilitates the porphyry Cu-Au mineralization in the Dinkidi deposit.The Early Miocene Central Cordillera Diorite Complex (also called Ango Batholith) in the Central Cordillera range shows clear fractionation of hornblende ± clinopyroxene, evolving geochemically from non-adakitic basaltic magma to adakitic granodioritic magma. There is no noteworthy porphyry or epithermal Cu-Au deposit related to the Central Cordillera Diorite Complex, mostly because they are primarily derived from a less enriched mantle source metasomatized by limited slab fluids. The initial lack of Cu-Au in the primary source of the Central Cordillera Diorite Complex prevents further Cu-Au mineralization of the complex, although they have undergone high degree evolution.
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影响因子：
2.6
作者：
C. Dimalanta;G. Yumul
通讯作者：
C. Dimalanta;G. Yumul
影响因子：
1.5
作者：
G. Yumul;C. Dimalanta;H. Bellon;D. Faustino;J. De Jesus;Rodolfo A. Tamayo;Ferdinand T. Jumawan
通讯作者：
G. Yumul;C. Dimalanta;H. Bellon;D. Faustino;J. De Jesus;Rodolfo A. Tamayo;Ferdinand T. Jumawan
DOI：
--
发表时间：
1999
期刊：
--
影响因子：
--
作者：
R. R. Claveria-R.
通讯作者：
R. R. Claveria-R.
菲律宾中部宿雾岛早白垩世高镁埃达克岩与铜金矿化有关：对古太平洋板块部分熔融的影响
影响因子：
3.3
作者：
Deng Jianghong;Yang Xiaoyong;Qi Huasheng;Zhang Zhao-Feng;Mastoi Abdul Shakoor;Sun Weidong
通讯作者：
Sun Weidong
DOI：
--
发表时间：
1984
期刊：
--
影响因子：
--
作者：
R. Sillitoe;Irineo M. Gappe
通讯作者：
R. Sillitoe;Irineo M. Gappe