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DOI | 10.1130/B35019.1 |
Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif | |
Tomek, Filip1,2; Zak, Jiri2; Svojtka, Martin1; Finger, Fritz3; Waitzinger, Michael3 | |
2019-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:997-1016 |
文章类型 | Article |
语种 | 英语 |
国家 | Czech Republic; Austria |
英文摘要 | The late Carboniferous Altenberg-Teplice caldera in the northwestern Bohemian Massif provides an intriguing example of rhyolite eruptions evolving to a trapdoor collapse and coeval ring dike emplacement. Geochemical data suggest that withdrawal of an underlying stratified magma chamber beneath the caldera took place in two steps. Eruptions of the reversely zoned Teplice rhyolite drained the chamber, followed by a trapdoor collapse of the caldera floor and emplacement of voluminous microgranite ring dike system at 312 Ma. The mechanism proposed here is that the subsiding caldera floor increased vertical load on the magma chamber and triggered remobilization of residual, cumulate-like, and otherwise non-eruptible magma mush. The magnetic fabrics (determined using the anisotropy of magnetic susceptibility [AMS]), carried by paramagnetic ferrosilicates and titanomagnetite, indicate that the ring dike magma first flowed upwards via four main feeder domains from which the magma was then distributed laterally. The asymmetric trapdoor collapse generated domains of dilation and contraction along the caldera limit, evidenced by different shapes of fabric ellipsoids and uneven apparent width of the individual ring dike segments. Based on this case example, we develop a general kinematic model for polyphase caldera collapse and ring dike emplacement, invoking a combination of multiple space-making processes: piston and trapdoor collapses together with downsag and faulting of the caldera floor, regional tectonic extension, reactivation of the preexisting structures, and volume changes in the caldera floor due to thermal stresses. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000466511700015 |
WOS关键词 | FREQUENCY-DEPENDENT SUSCEPTIBILITY ; W-LI DEPOSIT ; MAGMA FLOW ; DISTRIBUTION ANISOTROPY ; VOLCANOPLUTONIC COMPLEX ; MAGNETIC-SUSCEPTIBILITY ; CALDRON SUBSIDENCE ; ELLIPTIC CALDERAS ; PLUMBING SYSTEMS ; BAJA-CALIFORNIA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/182908 |
专题 | 地球科学 |
作者单位 | 1.Czech Acad Sci, Inst Geol, Rozvojova 269, Prague 16500, Czech Republic; 2.Charles Univ Prague, Fac Sci, Inst Geol & Paleontol, Albertov 6, Prague 12843, Czech Republic; 3.Univ Salzburg, Dept Chem & Phys Mat, Jakob Haringer Str 2A, A-5020 Salzburg, Austria |
推荐引用方式 GB/T 7714 | Tomek, Filip,Zak, Jiri,Svojtka, Martin,et al. Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:997-1016. |
APA | Tomek, Filip,Zak, Jiri,Svojtka, Martin,Finger, Fritz,&Waitzinger, Michael.(2019).Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,997-1016. |
MLA | Tomek, Filip,et al."Emplacement dynamics of syn-collapse ring dikes: An example from the Altenberg-Teplice caldera, Bohemian Massif".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):997-1016. |
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