本文關(guān)鍵詞： 天池火山 千年大噴發(fā) 堿流質(zhì)噴發(fā)階段 粗面質(zhì)噴發(fā)階段 巖漿混合 巖漿過(guò)程模型　出處：《巖石學(xué)報(bào)》2017年01期 　論文類(lèi)型：期刊論文

【摘要】：千年大噴發(fā)是長(zhǎng)白山天池火山最近的一次大規(guī)模爆炸式噴發(fā)活動(dòng)。本文在天池火口及周邊的地質(zhì)調(diào)查中發(fā)現(xiàn),千年大噴發(fā)存在堿流質(zhì)和粗面質(zhì)兩套堆積物,且具有巖漿混合現(xiàn)象。進(jìn)一步巖相學(xué)與地球化學(xué)研究,證實(shí)千年大噴發(fā)應(yīng)存在先后兩個(gè)噴發(fā)階段,即堿流質(zhì)噴發(fā)階段(SiO_2,~75%)和粗面質(zhì)噴發(fā)階段(SiO_2,~65%)。同時(shí),通過(guò)微量元素和斑晶特征等分析認(rèn)為兩階段的巖漿來(lái)自于兩個(gè)獨(dú)立的巖漿房,巖漿房平衡溫度分別為743℃和862℃,相應(yīng)深度約為5km和7~9km。另外,根據(jù)條帶狀巖漿的混合特征,認(rèn)為噴發(fā)過(guò)程中堿流質(zhì)與粗面質(zhì)巖漿混合發(fā)生在上升通道中,排除巖漿房?jī)?nèi)混合的可能性。最后根據(jù)噴發(fā)過(guò)程和巖漿特征,綜合提出了千年大噴發(fā)的巖漿過(guò)程模型。本文對(duì)千年大噴發(fā)的噴發(fā)過(guò)程和巖漿過(guò)程取得的新認(rèn)識(shí),增進(jìn)了對(duì)天池火山活動(dòng)習(xí)性的理解。
[Abstract]:The Millennium eruption of the Tianchi volcano in Changbai Mountain is a recent massive explosive eruption. The geological survey found in and around the Tianchi crater, the Millennium eruption of alkali liquid and trachytic two sets of deposits, with magma mixing phenomenon. Further petrographic and geochemical studies, confirmed the Millennium there has two eruption eruption phase, namely liquid alkali eruptive stages (SiO_2, ~75%) and trachytic eruption phase (SiO_2, ~65%). At the same time, through the analysis of trace elements and features that the two stage phenocryst magma from two independent magma chambers, the magma chamber equilibrium temperature were 743 DEG C and 862 degrees, the corresponding depth is about 5km and 7~9km. in addition, according to the characteristics of mixed banded magma, that the eruption process of alkali liquid and trachytic magma mixing occurred in the rising channel, excluding mixed magma chamber may be based on. The eruption process and magma characteristics have brought forward a large scale eruption magma process model comprehensively. In this paper, a new understanding of the eruption process and magma process of millennial eruption has enhanced the understanding of the activity habits of Tianchi volcanoes.

【作者單位】： 中國(guó)地震局地質(zhì)研究所活動(dòng)構(gòu)造與火山重點(diǎn)實(shí)驗(yàn)室;吉林省長(zhǎng)白山天池火山監(jiān)測(cè)站;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41302267) 中國(guó)地震局地質(zhì)研究所基本科研業(yè)務(wù)專(zhuān)項(xiàng)(IGCEA1505)聯(lián)合資助
【分類(lèi)號(hào)】：P317.3

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