巴西亚马逊克拉通Carajás省太古宙charnockites的地温大气特征及地球化学模拟

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Bhrenno Marangoanha, D. Oliveira, C. Lamarão, G. T. Marques, L. Silva
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引用次数: 0

摘要

在巴西北部Carajás省Canaã dos Carajás域中部的3个新太古代岩体中,出现了含正辉石晶长/闪长岩,石英闪长岩稀少。基于斜长石、黑云母、角闪石和辉石的矿物化学特征参数约束结晶条件为1150 ~ 850℃,750 ~ 600 MPa,熔体含水量适中(4.8 ~ 5.6 wt.%),相对氧化条件介于费长石-磁铁矿-石英(FMQ)和镍-氧化镍(NNO) + 1.7缓冲液之间。地球化学模拟表明,卡弗莱恩德长石至少经历了石英闪长岩-正闪石晶长岩和正闪石晶长岩-正闪石晶长岩两个分步结晶阶段,结晶含量高(45-60%,甚至更高)。在分馏结晶过程中,这种高结晶含量是岩浆体系中保留正辉石的关键因素,因为只有相对较小比例的熔体与早期形成的正辉石反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geothermobarometry and geochemical modeling of Archean charnockites from Carajás Province, Amazonian craton, Brazil
Orthopyroxene-bearing tonalites/trondhjemites with scarce quartz diorites comprise the Café enderbite that crops out in three Neoarchean plutons in the central portion of the Canaã dos Carajás domain, Carajás Province, northern Brazil. Intrinsic parameters based on the mineral chemistry of plagioclase, biotite, amphibole, and pyroxene constrain crystallization conditions to 1150–850°C and 750–600 MPa, moderate water content in the melt (4.8–5.6 wt.%) and relatively oxidizing conditions, between the fayalite–magnetite–quartz (FMQ) and nickel– nickel oxide (NNO) + 1.7 buffers. Geochemical modeling indicates that the Café enderbite evolved via at least two fractional crystallization stages – quartz diorite to orthopyroxene tonalite and orthopyroxene tonalite to orthopyroxene trondhjemite – with high crystal content (45–60%, or even higher). This high crystal content during fractional crystallization was the key factor to the preservation of orthopyroxene in the magmatic system as it left only a relatively small proportion of melt to react with early-formed orthopyroxene.
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来源期刊
Brazilian Journal of Geology
Brazilian Journal of Geology GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.20
自引率
7.10%
发文量
12
审稿时长
11 weeks
期刊介绍: The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history. The BJG publishes articles (including review articles), rapid communications, articles with accelerated review processes, editorials, and discussions (brief, objective and concise comments on recent papers published in BJG with replies by authors). Manuscripts must be written in English. Companion papers will not be accepted.
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