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首页> 外文期刊>International Journal of Earth Sciences >Evolution of the Lower Permian Rochlitz volcanic system, Eastern Germany: reconstruction of an intra‑continental supereruption
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Evolution of the Lower Permian Rochlitz volcanic system, Eastern Germany: reconstruction of an intra‑continental supereruption

机译：德国东部罗克利茨火山系统的演变：重建欧陆内超硬化的重建

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摘要

Extensional tectonics in the Late Paleozoic Central Europe was accompanied by rift magmatism that triggered voluminous intracontinental caldera-forming eruptions. Among these, the Lower Permian Rochlitz Volcanic System (RVS) in the North Saxon Volcanic Complex (Eastern Germany, Saxony) represents a supereruption (VEI 8, estimated volume of 1056 km(3)) of monotonous rhyolites followed by monotonous intermediates. Mapping, petrography, whole-rock geochemistry along with mineral chemistry and oxygen isotopes in zircon display its complex eruption history and magma evolution. Crystal-rich (35 vol%), rhyolitic Rochlitz-alpha Ignimbrite with strong to moderate welding compaction erupted in the climactic stage after reheating of the magma by basaltic injections. Due to magma mixing, low-volume trachydacitic-to-rhyolitic Rochlitz-beta Ignimbrite succeeded, characterized by high Ti and Zr-values and zircon with mantle delta O-18. Randomly oriented, sub-horizontally bedded fiamme, and NW-SE striking subvolcanic bodies and faults suggest pyroclastic fountaining along NW-SE-oriented fissures as the dominant eruption style. Intrusion of the Leisnig and the Grimma Laccoliths caused resurgence of the Rochlitz caldera forming several peripheral subbasins. In the post-climactic stage, these were filled with lava complexes, ignimbrites and alluvial to lacustrine sediments. Significant Nb and Ta anomalies and high Nb/Ta ratios (11.8-17.9) display a high degree of crustal contamination for the melts of the RVS. Based on homogenous petrographic and geochemical composition along with a narrow range of delta O-18 in zircon Rochlitz-alpha Ignimbrite were classified as monotonous rhyolites. For the Rochlitz-beta Ignimbrites, underplating and mixing with basic melts are indicated by Mg-rich annite-siderophyllite and delta O-18 6.0 in zircon. The wide spectrum of delta O-18 on zircon suggests an incomplete mixing process during the formation of monotonous intermediates in the RVS.
机译：晚古生代中欧的扩展构造伴随着裂谷的裂缝岩浆广告，引发了大量的肿瘤内破碎的爆发。其中，北撒克逊火山复合物（德国东部，萨克森州）的下二叠纪罗奇利茨火山系统（RVS）代表了一种超级关键（VEI 8，估计的1056 km（3）个体积）单调的脉灰，然后单调的中间体。 Zircon中的矿物化学和氧同位素以及矿物化学和氧同位素的绘图，岩化，展示其复杂的喷发历史和岩浆进化。富含水晶的（＆ 35体积％），血管罗氏罗氏甲基αIgnimbrite，在通过玄武岩注射再加热岩浆后，在高温阶段爆发的中等焊接压实。由于岩浆混合，低体积的曲静脉曲卟啉rochlitz-beta Ignimbrite成功，其特征在于高Ti和Zr值和带有搭式δO-18的锆石。随机定向，潜水层玻璃玻璃和NW-SE引人注目的亚脱石体和故障表明了沿着NW-SE导向的裂缝的发球式喷射，作为主要的喷发风格。 leisnig的侵入和Grimma Laccoliths引起了Rochlitz Caldera的复苏，形成了几个外周亚酶。在后期后期，这些液体充满了熔岩综合体，Ignimbrites和Elluvial，以湖泊沉积物。显着的Nb和Ta异常和高Nb / ta比（11.8-17.9）显示RV的熔体的高度地壳污染。基于均匀的岩体和地球化学组合物以及锆石罗奇利茨-αGronmbite的狭窄范围的Delta O-18被归类为单调脉灰岩。对于Rochlitz-Beta Ignimbrites，用碱性熔体的底层和混合由Mg富含镁的Annite-Siderophyllite和Delta O-18＆ 6.0在锆石。在锆石上的齐全的ΔO-18型ΔO-18表明在RVS中单调中间体的形成过程中不完全混合过程。

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