印度尼西亚中爪哇穆里亚半岛高钾火山岩的岩石学和火山地层学

S. Mulyaningsih, S. Bronto, A. Kusniadi, Lilis Apriyanti, L. Budiyanto, Danis Agoes Wiloso
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引用次数: 1

摘要

穆里亚半岛是位于巽他弧北部的第四纪火山。其活动受高钾和极高钾岩浆系列控制,形成富白石质粗面岩和富辉石质玄武安山岩。它是一个层状火山,由熔岩、角砾岩和凝灰岩层组成,一些岩脉上有一些年龄和组成不同的火山口和火星。研究区域覆盖了穆里亚火山、格努克火山和帕蒂亚亚火山。本文旨在描述不同火山物质的岩石学、矿物学和火山地层学。数据和材料来源于一次和二次数据。方法包括野外测绘、地层测量、样品采集、薄片分析和x射线荧光(XRF)主要元素地球化学。结果描述了两组火山岩,由富辉石岩的安山岩-玄武岩火山物质和富白石岩的粗质火山物质组成。安山岩玄武岩中有奥辉石、小粒橄榄石、少量钙长石和铁矿物。石墨烯(na -辉石)存在于富含白铁矿的粗壁岩中,通常与黑云母和角闪石相结合。钠钙斜长石,如拉布拉长安山岩,常存在于玄武岩-粗灰岩-安山岩中,通常很少有白石质。主要元素表现为% K2O为4-5.9%的高钾火山岩、% K2O为6-8.24%的超高钾火山岩和% K2O为2-3,9%的低钾火山岩。富硅火山物质(SiO2含量~57 ~ 64%)和低硅火山物质(SiO2含量~46 ~ 50%)组成了高钾至超高钾火山物质组。TAS图识别翠玉、phonolite和气管岩。地层资料确定布鲁组钙质沉积物为穆里亚粗面岩的基底岩。富浮石的Ujungwatu组火山角砾岩层是Genuk火山玄武岩-软质岩的基岩,暴露的Ujungwatu凝灰岩也由Patiayam火山玄武岩-软质岩-phonolite组成。像白长石一样的长石在构成穆里亚火山口的安山岩熔岩和岩脉中非常常见。穆里亚火山物质大多以白石质为主,部分火山含有富浮石的火山碎屑流和玄武岩熔岩。主要元素分析结果表明,岩石具有中高K亲和性(~2% K2O)。格努克和更老的穆里亚由富含白铜矿的软辉-蓝纹岩组成。穆里亚半岛发育的两期岩浆活动形成了高钾至极高钾岩浆活动和中钾钾碱性岩浆活动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Petrology and Volcano-Stratigraphy of The Muria-Peninsula High-K Volcanic Rocks, Central Java, Indonesia
The Muria-Peninsula is a Quaternary volcano located in the northern Sunda arc. Its activity was controlled under high potassic and very high potassic magma series resulting in leucite-rich trachyte and pyroxene-rich basaltic-andesite. It is a strato-type volcano that is composed of lava, breccia, and tuff layers, and some dikes have some volcanic craters and maars varying in age and composition. The study area is covering the volcanoes of Muria, Genuk, and Patiayam. This paper aims to describe the petrology, mineralogy, and volcano-stratigraphy of the different volcanic materials. The data and materials were sourced from the primary and secondary data. The methods are field mapping, stratigraphy measurements, collecting samples, thin section analyses, and major element geochemistry using X-Ray fluorescence (XRF). The results describe two groups of volcanic rocks consisting of pyroxene-rich andesitic-basaltic volcanic materials and leucite-rich trachytic volcanic materials. Augite presents in the andesitic basalt together with small grains of olivine and a few anorthite and foid minerals. Aegirine (Na-Pyroxene) is present in the leucite-rich trachyte that is often associated with biotite and hornblende. Na-Ca Plagioclase such as labradorite-andesine is often present in the basaltic-trachy-andesite that is usually rarely leucite. The major elements show high-K volcanic rocks with % K2O is 4-5.9% and very high-K volcanic rocks (with % K2O is between 6-8.24%) and low-K volcanic rocks that contain % K2O is 2-3,9%. There are two groups of high-K to very high-K volcanic materials consisting of silicic-rich volcanic materials (~57-64% of SiO2) and low-silicic volcanic materials (~46-50%). The TAS diagram identifies tephrite, phonolite, and trachyte. Stratigraphic data identifies calcareous sediments of the Bulu Formation as the basement rocks of the Muria trachyandesite. Beds of pumice-rich volcanic breccia of the Ujungwatu Formation are the basement rocks of the basanite-tephrite of the Genuk Volcano, and the tuff of the Ujungwatu is also exposed consisting of the basanite-tephritic-phonolite of the Patiayam Volcano. The leucite-like feldspars are very common in the andesite lava and dikes that compose the crater of Muria. Most of the Muria volcanic materials are rarely in leucite, while some maars contain pumice-rich pyroclastic flows and basaltic lava. The results of the major elemental analysis of the Muria materials indicate that the rock tends to be of medium to high K affinity (~2% K2O). The Genuk and older Muria are consisting of leucite-rich tephrite-phonolite. It was two periods of magmatic series developed in the Muria-Peninsula that was resulting in the high-K to very high-K magmatism and the medium K Kalk-alkaline magmatism.
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