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首页> 外文期刊>Arabian journal of geosciences >Rhonite in undersaturated alkaline gabbroic rocks, Central Alborz, North Iran: petrography and mineral chemistry
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Rhonite in undersaturated alkaline gabbroic rocks, Central Alborz, North Iran: petrography and mineral chemistry

机译：伊朗北部中部阿尔伯兹，不饱和碱性辉长岩中的菱铁矿：岩相学和矿物化学

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The Kamarbon alkaline gabbroic intrusion crops out in Central Alborz, north Iran, along the northern margin of the Alpine-Himalayan belt. The gabbroic intrusion includes theralites at marginswhich replace with teschenites toward the center. In teschenitic rocks, the main minerals are diopside, clinopyroxene, and rhnite. In this research, the occurrence of rhnite is reported in Kamarbon teschenitic gabbros, and also its mineralogical properties, paragenesis, and source magma are investigated. Based on whole rock and microprobe analysis data, we try to clarify the formation of Kamarbon gabbro and the crystallization condition of rhnite. In teschenitic gabbros, rhnite reveals the composition (Na, Ca)(1.97)(Ti, Al-VI, Fe+3, Fe+2, Mn, Mg)(5.99)(Si, Al-IV)(6.02)O-20. On the basis of petrographical observations and mineral chemistry, we suggest that the teschenites were formed in distinctive lower pressures and temperatures than theralites, below 1.9 kbar and 1075 degrees C. Rhnite was crystallized (at the mentioned P-T condition) as a primary phase, in the late stage of crystallization at shallow depth corresponding with 6-10 km, in teschenites. Important factors of the rhnite crystallization in undersaturated magmas can be regardarded as Al and Ti enrichment and Si depletion; the same enrichment and depletion are also observed in the associated clinopyroxenes.
机译：Kamarbon碱性辉长岩侵入体在伊朗北部的Alborz中部，沿着Alpine-Himalayan带的北部边缘播种。辉长岩侵入包括边缘的特瑞石，其向中心被替补石代替。在特氏岩中，主要矿物是透辉石，斜辉石和rhite。在这项研究中，据报道在卡马本特氏长辉石中出现了菱锰矿，并研究了其矿物学性质，共生作用和源岩浆。基于整个岩石和微探针分析数据，我们试图弄清Kamarbon gabbro的形成和rhite的结晶条件。在tesb的辉长岩中，菱锰矿显示其成分（Na，Ca）（1.97）（Ti，Al-VI，Fe + 3，Fe + 2，Mn，Mg）（5.99）（Si，Al-IV）（6.02）O- 20根据岩相学观察和矿物化学，我们建议在低于1.9kbar和1075摄氏度的条件下，钙钛矿形成的压力和温度要比铝矾石低得多，并且温度较低。在钛铁矿中，在较浅深度的结晶后期，对应于6-10 km。欠饱和岩浆中菱镁矿结晶的重要因素可以看作是Al和Ti的富集和Si的贫化。在相关的环吡咯烯中也观察到相同的富集和消耗。

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