| 新生代埃达克岩两种成因类型的含矿性和源区:西南太平洋带与东太平洋带的对比 |
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| 引用本文： | 杨振强,朱章显.新生代埃达克岩两种成因类型的含矿性和源区:西南太平洋带与东太平洋带的对比[J].华南地质与矿产,2010(3):1-11. |
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| 作者姓名： | 杨振强 朱章显 |
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| 作者单位： | 武汉地质矿产研究所,武汉,430205 |
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| 基金项目： | 中国大陆周边地区主要成矿带成矿规律对比及潜力评价 |
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| 摘 要： | 埃达克岩是一种新型的火成岩(Sr/Y值≥20),形成于环太平洋带的大洋岛弧、大陆边缘造山带和陆缘火山弧环境,依据REE配分模式可将其划分为两种成因类型:大洋型(O-型)埃达克岩和大陆型(C-型)埃达克岩。西南太平洋带是世界上新生代埃达克岩和类埃达克岩广泛分布的地区之一。这些中酸性岩浆岩广泛分布于东南亚地区的菲律宾群岛、苏拉威西和加里曼丹中部、印度尼西亚几内亚岛和巴布亚新几内亚至所罗门群岛一带,零星见于班达岛弧、苏门答腊和西爪哇等地。研究结果表明:不同成因类型的埃达克岩具有不同的含矿性,反映各自来源于不同的岩浆岩源区。无论在西南太平洋带还是东太平洋带(智利),C-型埃达克岩(La/Yb值≥12)是俯冲板块的部分熔融作用叠加岩浆上侵过程中MASH(熔融-混染-储存-均一化)和AFC(混染-分异-结晶)作用的产物,与世界级斑岩铜-金矿床共生;而O-型埃达克岩(La/Yb比值≤12)则与俯冲的海洋平缓板块部分熔融作用有关,在西南太平洋带主要与浅成热泉金矿带和喷气型矿床有成因联系。
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| 关 键 词： | C-型和O-型埃达克岩 弧-陆碰撞 超大型斑岩铜-金矿床 |
The Metallogeny and Magma Source Areas for Two Types of Cenozoic Adakites: West-South Pacific Zone Versus East Pacific Zone |
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| YANG Zhen-qiang,ZHU Zhang-xian.The Metallogeny and Magma Source Areas for Two Types of Cenozoic Adakites: West-South Pacific Zone Versus East Pacific Zone[J].Geology and Mineral Resources of South China,2010(3):1-11. |
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| Authors: | YANG Zhen-qiang ZHU Zhang-xian |
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| Institution: | (Wuhan Institute of Geology and Mineral Resources,Wuhan 430205) |
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| Abstract: | The adakite and adakite-like rocks are a new kind of igneous rocks（Sr/Y ratio≥20）located at the oceanic island arc areas,continental margin orogenic zone and volcanic arcs of continental margin around circum-pacific zone.Based on the characteristics of REE distribution pattern types,the adakites and adakite-like rocks can obviously be subdivided into two types：oceanic type（O-type）and continental type （C-type）adakites.The southwestern Pacific zone has recently become one of the most pervasive distribution areas for Cenozoic adakite and adakite-like rocks in the world.However,these middle-acid magmatic rocks widely occur within Philippines archipelago,Sulawesi（Indonesia）,Central Kalimantan,Guinea Island（both Indonesia and New Papua Guinea）to Solomon Islands as well as really rare in Sumatra,western Java,and Banda island arc of Sotheastern Asia region.According to the literature investigation,we summarize that the two different types of adakites create different ineralization and reflect that they are derived from different magmatic source areas.C-type of adakites（La/Yb ratio≥12）can extremely be produced from slab melting plus upper plate magmatic processes such as MASH（melting-assimilation-storage-homogenization）and AFC（assimilation-fractional-crystallization）and associated with world-class porphyry Cu-Au deposits both in southwestern Pacific zone or eastern Pacific zone,whereas O-type of adakites（La/Yb ratio≤12）are likely related to partly melting of subducted oceanic flat-slab and mainly related to the origin of the world-class epithermal hot-spring gold zone and exhalation ore deposits in southwestern Pacific zone. |
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| Keywords: | C-type and O-type adakite arc-continent collision giant porphyry Cu-Au deposits |
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