弗洛雷斯弧后盆地火山块状硫化物矿床构造研究进展

N. C. Aryanto, H. Kurnio
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引用次数: 2

摘要

测深、岩石学、海洋磁学和地震SBP数据已经确定了显示热液活动的西北-东南方向海底山脊。这一活动发生在巴鲁纳孔巴山、阿邦孔巴山和伊布孔巴山。火山岩为安山岩、玄武岩熔岩流、凝灰岩和浮石。安山岩-玄武质熔岩呈现斑状、粒间、层间到球墨斑状结构。岩石由钾长石、斜长石和辉石组成。这些矿物呈小尺寸、短棱柱状,分散在非常细的基质矿物或玻璃中。大多数火山岩都经历了不同程度的蚀变。钾长石和斜长石在钠长石化过程中主要转化为绢云母、粘土矿物、碳酸盐、绿帘石和氧化物矿物、不透明矿物和次生斜长石,辉石被绿泥石取代。其他矿物有黑云母和石英,贱金属有铜、锌、银、砷、铅和金。矿化分为在250-400摄氏度的温度范围内形成的千枚带、亚丙基带和千枚钾质带。Komba山脊的海底热液蚀变与火山成因硫化物矿床有关,该矿床受弧后构造环境中地壳裂谷导致的地壳变薄控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tectonics of Volcanogenic Massive Sulphide (VMS) Deposits at Flores Back Arc Basin: A Review
The bathymetry, petrology, marine magnetic, and seismic-SBP data have identified the northwest-southeast direction submarine ridge that shows hydrothermal activity. This activity occurred through Mount Baruna Komba, Abang Komba, and Ibu Komba. The volcanic rocks are andesite basaltic lava flows, tuff, and pumice. The andesite basaltic lava shows porphyritic, intergranular, intersertal to glomeroporphyritic textures. The rock composes anhedral minerals of k-feldspar, plagioclase, and pyroxene. These minerals present in small-sized, short prismatic dispersed in very fine groundmass minerals or glasses. Most of the volcanic rocks have experienced various degrees of alteration. The k-feldspar and plagioclase are most dominantly transformed into sericite, clay mineral, carbonate, epidote and oxide mineral, opaque mineral, and secondary plagioclase through the albitization process, while pyroxene replaced by chlorite. Other minerals are biotite and quartz, and base metals are present Cu, Zn, Ag, As, Pb, and gold. Mineralization categorizes as the phyllic zone, sub-prophylithic zone, and phyllic-potassic zone that formed at a temperature range of 250-400oC. The submarine hydrothermal alteration in the Komba Ridge is associated with a volcanogenic sulphide deposit controlled by crust thinning due to the crust rifts in the back-arc tectonic setting.
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