The Volcanical Rocks and Their Geochemical-Tectonic Setting Discrimination of Mesozoic to Cenozoic Sumatra(Indonesia)
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摘要: 本文介绍了苏门答腊(印度尼西亚)火山岩的时代、分布和产状。根据火山岩的岩石化学资料,应用PetroGraph和Minpet2.0岩浆岩地球化学作图软件对60多个中、新生代火山岩岩石化学分析数据进行处理,并对其地球化学-构造环境判别图解的解释,探讨新生代火山岩盆地及其中生代-古生代基底的火山岩形成构造环境。根据这些判别图,认为苏门答腊新生代火山岩盆地基底为大陆边缘裂谷(初始裂谷),并在渐新世以后转化为大陆边缘火山弧。高钾橄榄玄粗岩系列和埃达克岩与苏门答腊火山岩体系共生,显示该区具有寻找斑岩-低温热液型铜-金矿找矿远景。
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关键词:
- 苏门答腊(印度尼西亚)火山岩 /
- 地球化学-构造环境判别图借 /
- 高钾橄榄玄粗岩系列和埃达克岩 /
- 斑岩-低温热液型铜-金矿
Abstract: This paper introduces the volcanical ages,distribution and occurrences at Sumatra island(Indonesia),and presents a lot of geochemical-tectonic setting discrimination diagrams by using the new geochemical software of PetroGraph 2 beta and Minpet 2.0 processing petrologic data of igneous petrology,,and then discusses tectonic environments about Cenozoic volcanic basins as well as their Paleozoinic-Mesozoic basement through the volcanically chemical analyses.Based on these discrimination diagrams,therefore,the authors suggest that the Cenozoic(Pre-tertiary) volcanic basement in Sumatra may belong to continental margin rift(initial rift),and then became a volcanic arc of the continental margin after Oligocene.And the association of the shoshonitic and adakitic rocks with volcanics gives significant indications in searching for porphyry-hydrothermal Cu-Au mineralization. -
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