捷克共和国热尔卡（Eisenbühl）更新世scoria锥中金云母和卡氏巨晶的40Ar/39Ar步进加热测年

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Geologica Carpathica Pub Date : 2020-08-01 DOI:10.31577/geolcarp.71.4.6

L. Krmíček, Martin J. TIMMERMAN, Martin A. ZIEMANN, M. Sudo, J. Ulrych

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引用次数: 1

摘要

40Ar/39Ar步进加热来自于埃列兹纳赫ůrka的含hauyne的橄榄石-辉橄榄岩-焦烧岩/火山灰岩的云母和角闪石巨晶，产生了金云母的435±108ka同位素相关年龄和卡苏特巨晶的更不精确的1.55Ma总气体年龄。角闪石巨晶可能构成镁铁质、含水岩质岩浆结晶的第一阶段，而较年轻的金云母巨晶则构成镁铁质和含水岩性岩浆结晶的后期。不能排除角闪石巨晶在岩相学上与火山灰岩和金云母巨晶无关，来源于地幔捕虏体或分解的较老的深地壳伟晶岩。这既符合热列日纳角闪石的稀有性，也符合在角闪石晶体边缘观察到的岩浆吸收迹象。

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40Ar/39Ar step-heating dating of phlogopite and kaersutite megacrysts from the Železná hůrka (Eisenbühl) Pleistocene scoria cone, Czech Republic

40Ar/39Ar step-heating of mica and amphibole megacrysts from hauyne-bearing olivine melilitite scoria/tephra from the Železná hůrka yielded a 435±108 ka isotope correlation age for phlogopite and a more imprecise 1.55 Ma total gas age of the kaersutite megacryst. The amphibole megacrysts may constitute the first, and the younger phlogopite megacrysts the later phase of mafic, hydrous melilitic magma crystallization. It cannot be ruled out that the amphibole megacrysts are petrogenetically unrelated to tephra and phlogopite megacrysts and were derived from mantle xenoliths or disaggregated older, deep crustal pegmatites. This is in line both with the rarity of amphibole at Železná hůrka and with the observed signs of magmatic resorption at the edges of amphibole crystals.

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来源期刊

Geologica Carpathica 地学-地球科学综合

CiteScore

2.40

自引率

23.10%

发文量

审稿时长

>12 weeks

期刊介绍： GEOLOGICA CARPATHICA covers a wide spectrum of geological disciplines including geodynamics, tectonics and structural geology, volcanology, stratigraphy, geochronology and isotopic geology, karstology, geochemistry, mineralogy, petrology, lithology and sedimentology, paleogeography, paleoecology, paleobiology and paleontology, paleomagnetism, magnetostratigraphy and other branches of applied geophysics, economic and environmental geology, experimental and theoretical geoscientific studies. Geologica Carpathica , with its 60 year old tradition, presents high-quality research papers devoted to all aspects not only of the Alpine-Carpathian-Balkanian geoscience but also with adjacent regions originated from the Mediterranean Tethys and its continental foreland. Geologica Carpathica is an Official Journal of the Carpathian-Balkan Geological Association.