东安纳托利亚火山省(EAVP)凡湖(Lake Van)及其周围关键温层玻璃地球化学及温层地层学研究

IF 3.3 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
Rebecca J. Kearney , Jeremy Goff , Victoria Smith , Markus J. Schwab , Yavuz Özdemir , Özgür Karaoǧlu , Matthew Thirlwall , Dan N. Barfod , Oona Appelt , Christina Günter , Jan Fietzke , Nadine Pickarski , Ina Neugebauer , Rik Tjallingii , Achim Brauer
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引用次数: 0

摘要

东安纳托利亚火山省(EAVP)的Nemrut和s phan火山是重要的火山灰(tephra)来源,在地中海东部地区的古气候和考古记录中都有发现。然而,这些火山的玻璃地球化学研究很少,对其喷发历史也知之甚少,这限制了它们充分的温度年代学潜力。在这里,我们详细、全面地介绍了在Van湖周围新的和以前研究过的近端露头取样的tephra矿床的单碎片主要、次要和微量元素的地球化学特征,以及在Van湖ICDP Ahlat Ridge (AR)核心的14个可见tephra层(v层),跨度为130至30 ka。对近端喷发单元:下粗质浮石(LT-P)、下粗质火成岩(LT-I)、中浮石、上流纹浮石和火成岩(UR-PI)、上粗质火成岩(UT-I)以及所选v层的火山玻璃进行了地球化学表征。这一新的玻璃数据允许在近端单元和几个v层之间进行新的和修订的以前的年代地层对比。V-18a的混合流纹岩和粗裂玻璃与UR-P和UR-I近端tephra单元相关,并与先前发表的Middle Nemrut (M-NF)-O, M-NF- i, Tatvan Ignimbrite和AP-8单元的数据相关。这些都来自同一火山口形成的Nemrut火山喷发在~ 33 ka。较老的V-30层玻璃对应于一个中浮石单元和M-NF-R, V-45层代表“Çekmece组”。V-51的纤溶玻璃与LT-P、LT-I和m - nf -凝集素单位相关。V-60火山独特的玄武岩玻璃与İncekaya火山喷发有关,而V-64火山则是新近发现的一次喷发。在Nemrut发现和分析的旧v层是基于将新的玻璃成分与之前发表的全岩石和玻璃数据进行比较。这一比较表明,V-75 pantelleritic tephra与日期确定的AP-4近端单元相关。利用SiO2、FeOt、CaO和Al2O3可以很容易地对这些大喷发进行化学区分。将近端露头与连续的、约束良好的凡湖沉积内部记录相结合,在近端露头记录破碎且混乱的火山区提供了详细的地层记录。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Glass geochemistry and tephrostratigraphy of key tephra layers in and around Lake Van, Eastern Anatolian Volcanic Province (EAVP)
The volcanoes of Nemrut and Süphan in the Eastern Anatolian Volcanic Province (EAVP) are significant sources of volcanic ash (tephra), which are found in palaeoclimatic and archaeological records in the eastern Mediterranean region. However, there is sparse glass geochemistry and little known about the eruption history of these volcanoes, limiting their full tephrochronological potential. Here, we present detailed, comprehensive single-shard major, minor and trace elem geochemistry of tephra deposits sampled at new and previously studied proximal outcrops around Lake Van and fourteen visible tephra layers (V-layers) from the ICDP Ahlat Ridge (AR) core of Lake Van spanning 130 to 30 ka. The volcanic glass from the following proximal eruption units: Lower Trachytic Pumice (LT-P), Lower Trachytic Ignimbrite (LT-I), Middle Pumices, Upper Rhyolitic Pumice and Ignimbrite (UR-PI), Upper Trachytic Ignimbrite (UT-I), and the chosen V-layers were geochemically characterised. This new glass data allows new and revised previous chrono-stratigraphic correlations between the proximal units and several V-layers. Mixed rhyolitic and trachytic glasses of V-18a correlate to the UR-P and UR-I proximal tephra units, and to previously published data from the Middle Nemrut (M-NF)-O, M-NF-I, Tatvan Ignimbrite and AP-8 units. These are all from the same caldera forming eruption of Nemrut at ∼33 ka. Glasses of the older V-30 layer correlate to a Middle Pumice Unit and M-NF-R, and V-45 represents the ‘Çekmece Formation’. The trachytic glasses of V-51 correlate to LT-P, LT-I and the M-NF-Agglutinate unit erupted from Nemrut. The distinctive basaltic glasses from V-60 correlate to an eruption of İncekaya and V-64 is a newly identified eruption from the Süphan volcano. The older V-layers identified and analysed are from Nemrut based on comparing the new glass compositions to previously published whole-rock and glass data. This comparison indicates the V-75 pantelleritic tephra correlates to the dated AP-4 proximal unit. Each of these large eruptions are easily chemically differentiated using SiO2, FeOt, CaO and Al2O3. The integration of the proximal outcrops with the continuous, well-constrained Lake Van sedimentary medial record provides a detailed tephrostratigraphic record in a volcanic region where the proximal outcrop record is fragmented and confusing.
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来源期刊
Quaternary Science Reviews
Quaternary Science Reviews 地学-地球科学综合
CiteScore
7.50
自引率
15.00%
发文量
388
审稿时长
3 months
期刊介绍: Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.
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