Adakites are volcanic rocks of intermediate to felsic composition that have geochemical characteristics of magma originally thought to have formed by partial melting of altered basalt that is subducted below volcanic arcs. [2] .

埃达克岩是指由角闪安山岩到英安岩、流纹岩等一套中酸性熔岩组合的特殊类岛弧岩石，以缺少玄武岩特点，通常被认为是玄武岩俯冲到火山岛弧后部分熔融形成。

2012年3月1日 · Adakite was originally proposed as a genetic term to define intermediate to high-silica, high Sr/Y and La/Yb volcanic and plutonic rocks derived from melting of the basaltic portion of oceanic crust subducted beneath volcanic arcs.

2022年8月1日 · Adakite studies have generated some confusions because (1) the definition of adakite combines compositional criteria with a genetic interpretation (melting of subducted basalt), (2) the definition is fairly broad and relies on chemistry as its distinguishing characteristic, (3) the use of high pressure melting experiment results on wet basalts ...

2019年12月23日 · Taking account of their importance in inferring continental geodynamic processes, adakites have been the subject of considerable research since their discovery and identification.

2005年1月1日 · The two main types of modern adakites can be defined on the basis of their silica content, amongst other compositional attributes. The contrasting distinction between high-SiO 2 adakite and low-SiO 2 adakite is not only a mineralogical or chemical compositional difference, but essentially emphasizes difference in source and petrogenesis. The ...

Adakites are rare extrusive and intrusive igneous rocks that are silicic and sodium-rich. They were originally associated with the subduction of young oceanic lithosphere (≤ 25 Ma); however, they are now also commonly identified in non-subduction zone settings.

adakite是一类高铝的中酸性火山岩或侵入岩 ,主要特点是 :高Sr (40 0× 10 - 6～ 2 0 0 0× 10 - 6) ,低Y和Yb (Y≤ 18× 10 - 6,Yb≤ 1.9× 10 - 6) ,轻重稀土元素强烈分异 ,不具有明显的Eu负异常 ,K2 O/Na2 O比值低 (<0 .5 )。 adakite主要分布于环太平洋地区 ,少数分布于一些古老造山带中 ,它的形成主要与年轻的 (<2 5Ma)俯冲洋壳的部分熔融有关 ,也可能与老的俯冲洋壳或底侵玄武岩的部分熔融、或者与增厚地壳的底部发生拆沉作用有关。 熔融残留相主要是含榴角闪岩或榴辉岩 ,也可能为麻 …

2020年11月5日 · Adakitic rocks are intermediate-acid magmatic rocks characterized by enrichment in light rare-earth elements, depletion in heavy rare-earth elements, positive to negligible Eu and Sr anomalies, and high La/Yb and Sr/Y ratios.

Adakites are represented by different subtypes and are found in spatial and temporal association with specific Nb-enriched basalts and Cu-Au mineralization. The adakites are compared with Precambrian tonalite-trondhjemite-granodiorite (TTG) series showing similarities and differences.