苏拉威西埃达克岩、类埃达克岩分布与特征  

Distribution and Geochemical Characteristics of Adakites and Adakite-Like Rocks in Sulawesi,Indonisia

作　　者：朱章显[1] 赵财胜[2] 杨振强[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003 [2]中国地质调查局发展研究中心,北京100083

出　　处：《吉林大学学报（地球科学版）》2009年第1期80-88,共9页Journal of Jilin University：Earth Science Edition

基　　金：中国地质调查局项目(1212010661308)

摘　　要：在东南亚一带的地质研究工作中,查阅了近10多年来地质文献上发表的有关印度尼西亚苏拉威西岛弧的岩石化学数据,查出符合埃达克岩条件的中、酸性岩岩石样品25个。样品分布于南苏拉威西、中苏拉威西、北西苏拉威西和北苏拉威西,构成巽他古大陆边缘新生代埃达克岩分布带。埃达克岩岩石类型分别属于岛弧拉斑系列、钙碱性系列和高钾钙碱性系列,以重稀土元素Y、Yb含量低和高Sr值为特征。微量元素蛛网图上有明显的Th,Sr峰。大离子亲石元素(LILE)和高场强元素(HFSE)相对富集。本区埃达克岩和埃达克质岩可划分为两种类型:第一种为岛弧拉斑/钙碱性系列,见于大洋岛弧和陆缘火山弧,其REE配分模式属于大洋岛弧型(O型);另一种产于大陆板块内部,与陆-陆碰撞和后碰撞构造环境有成因联系,属于大陆型(C型)埃达克岩。The authors recently worked on the geological research project about East-Southern Asia, read a lot of geological publications of Sulawesi during the latest 10 years and discovered about 25 midacidic rock samples that may be considered as normal adakites or adakite-like rock according to rock-chemical analysis data. These adakites and adakite-like rock samples are distributed in southern, central, northwestern and northern Sulawesi respectively to form a Cenozoic adakite belt at the Sundaland margin. The rock types Of adakites in Sulawesi belonging to the tholeiitic, calc alkaline and high potassium calc alkaline series, are characterized by low values of Y and Yb of heavy REE elements and high contents of Sr. There are positive Th ,Sr anomaly value peaks and negative Nb,Ta anomaly value valley on the spider grams of the trace elements. And there are enrichments in high-field strength elements （HFSE） and large ion thophytes elements （LITE）. The adakites and adakiteqike rocks of Sulawesi can be divided into two types： the first belonging to tholeiitic/calc-alkaline series may be considered to be oceanic island arc and/or continental margin volcano arc with characteristics of REE pattern of oceanic island arcs（O type）. The other type belonging to high potassium calc alkaline series may be related to continental adakites（C type） is located at continental within plat related to main continent - continent collision or post-collision of Sulawesi.

关 键 词：苏拉威西(印度尼西亚) 埃达克岩 类埃达克岩 大洋岛弧 陆陆碰撞或后碰撞 

分 类 号：P588.1[天文地球—岩石学]