| 两类埃达克岩的含矿性和成因:东南亚地区与东太平洋带对比 |
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| 引用本文： | 朱章显,杨振强,向文帅,胡鹏.两类埃达克岩的含矿性和成因:东南亚地区与东太平洋带对比[J].吉林大学学报(地球科学版),2012(Z1):237-246. |
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| 作者姓名： | 朱章显 杨振强 向文帅 胡鹏 |
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| 作者单位： | 中国地质调查查局武汉地质调查中心 |
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| 基金项目： | 中国地质调查局项目(1212010661308) |
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| 摘 要： | 新生代埃达克岩是一种新型的火成岩(Sr/Y≥20),多产出于大洋岛弧、大陆边缘造山带(东南亚地区)和陆缘火山弧环境(东太平洋带),依据REE配分模式可将其划分为2种成因类型:大洋型(O型)和大陆型(C型)。埃达克岩分别广泛分布于东南亚地区的菲律宾群岛、苏拉威西、中加里曼丹、印度尼西亚几内亚岛、巴布亚新几内亚至所罗门群岛一带,及东太平洋带的北美洲、墨西哥、中美洲、南美洲的北部至南部。研究表明:不同成因类型的埃达克岩具有不同的含矿性,反映各自岩浆源区不同。C型埃达克岩(La/Yb12)是俯冲海洋板块部分熔融叠加增厚的地壳底部部分熔融MASH(熔融-混染-储存-均一化)和AFC(混染-分异-结晶)作用的产物,多半与世界级斑岩铜金矿床共生;O型埃达克岩(La/Yb≤12)则与平缓俯冲的海洋板片部分熔融作用有关,在东南亚地区主要与浅成热泉金矿有成因联系。
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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 火成岩 |
Metallogeny and Origin for Two Types of Cenozoic Adakites: Southeastern Asia Region Versus East Pacific Zone |
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| Zhu Zhang-xian,Yang Zhen-qiang,Xiang Wen-shuai,Hu Peng.Metallogeny and Origin for Two Types of Cenozoic Adakites: Southeastern Asia Region Versus East Pacific Zone[J].Journal of Jilin Unviersity:Earth Science Edition,2012(Z1):237-246. |
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| Authors: | Zhu Zhang-xian Yang Zhen-qiang Xiang Wen-shuai Hu Peng |
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| Institution: | Wuhan Center of Geological Survey,China Geological Survey,Wuhan 430223,China |
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| Abstract: | The Cenozoic adakite,usually located at the oceanic island arcs,continental margin orogenic zone(in southeastern Asia) and volcanic arcs of continental margin(around eastern circum-Pacific zone),is a new kind of igneous rock(Sr/Y ratio≥20),which can be subdivided into two kinds of origin types: oceanic type(O-type) and continental type(C-type) based on their REE distribution patterns.The adakites in southeastern Asia are widely distributed within Philippines archipelago,Sulawesi(Indonesia),Central Kalimantan,Guinea Island(both Indonesia and New Papua Guinea) to Solomon Islands,but relatively rare in Sumatra,wes-tern Java,and Banda island arc;adakites around eastern circum-Pacific zone include North America,Mexico,Central America,and South America.According to the research results,the two subtypes of adakite show diffe-rent metallogenic features,reflecting that they derived from diffe-rent magmatic sources.C-type adakites(La/Yb ratio>12) formed from partial melting of subducted oceanic slab plus partial melting of thickened lower portion of crust,which can be considered as products of MASH(melting-assimilation-storage-Homogenization) and AFC(assimilation-fractional-crystallization) and mostly associated with world-class porphyry Cu-Au ore deposits both in southeastern Asia region and eastern Pacific zone,whereas O-type adakites(La/Yb ratio≤12) are likely related to partial melting of flatly subducted oceanic slab and genetically related to those world-class epithermal hot-spring gold zone in southeastern Asia region. |
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| Keywords: | C-type and O-type adakites arc-continent collision giant porphyry Cu-Au deposits igneous rocks |
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