气候变化领域集成服务门户(CCPortal): Development of a synorogenic composite sill at deep structural levels of a continental arc (Odenwald, Germany). Part 1: Sederholm-type emplacement portrayed by contact melt in shrinkage cracks

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DOI	10.1016/j.tecto.2021.228774
	Development of a synorogenic composite sill at deep structural levels of a continental arc (Odenwald, Germany). Part 1: Sederholm-type emplacement portrayed by contact melt in shrinkage cracks
	Zulauf G.; Gerdes A.; Hattingen E.; Hoefer H.E.; Loeckle F.; Marschall H.R.; Nesbor H.-D.; Petschick R.; Reischmann T.; Schmeling H.; Zulauf J.
发表日期	2021
ISSN	00401951
卷号	805
英文摘要	We present geochronological, thermobarometric and computertomographic data from a composite sill exposed in the Weschnitz pluton of the Variscan Odenwald. The wall rock consists of quartzmonzodiorite, which intruded at deep structural levels (P = ca. 0.50 GPa, ca. 18 km depth) in a continental arc setting. Zircons and titanites of the quartzmonzodiorite yielded similar U[sbnd]Pb ages at 344.3 ± 0.6 and 343.2 ± 2.1 Ma, respectively, reflecting fast initial cooling (≥76 °C/m.y.) until the solidus was attained at ca. 680 °C. Under these conditions, the quartzmonzodiorite was cut by a spessartite sill, which yielded a U[sbnd]Pb titanite age at 342.0 ± 1.0 Ma. The short period between wall rock and sill emplacement (≤3.9 m.y.) suggests that both are genetically related. The quartzmonzodiorite situated adjacent to the spessartite sill is enriched in quartz and plagioclase and depleted in hornblende. As geothermobarometric data of these felsic parts yielded T = ca. 710 °C and P = 0.42 GPa (ca. 15 km depth), they are interpreted as contact melt, which invaded into shrinkage cracks of the cooling sill resulting in thin felsic veins. The migration of contact melt from the wall rock into the shrinkage cracks was suction-induced because of volume gain by contact melting in the wall rock and volume loss by cooling of the sill. The formation of such Sederholm-type composite veins seems to be very fast. Titanites of the felsic veins yielded a U[sbnd]Pb age at 341.8 ± 1.5 Ma, which is the same like that of the sill. Moreover, results of thermal modelling indicate a maximum period of 4 months between sill emplacement and the time when both the quartzmonzodiorite and the sill had attained the ambient temperature. The modelling further explains, why Sederholm-type veins, described from several places around the world, are restricted to deep crustal levels. © 2021 Elsevier B.V.
关键词	Composite vein Sederholm-type vein Spessartite sill Thermal modelling Variscides Weschnitz pluton
英文关键词	Cooling; Feldspar; Geochronology; Rocks; Shrinkage; Contact melting; Crustal levels; Initial cooling; Short periods; Shrinkage cracks; Structural levels; Thermal modelling; Volume loss; Composite structures; continental arc; crack; emplacement; geobarometry; geochronology; Hercynian orogeny; melt; modeling; pluton; sill; tectonic setting; vein (geology); Germany; Odenwald
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208124
作者单位	Institut für Geowissenschaften, Goethe-Universität Frankfurt a.M., Altenhöferallee 1, Frankfurt a.M., D-60438, Germany; Frankfurt Isotope and Element Research Center (FIERCE), Goethe-Universität Frankfurt a.M., Altenhöferallee 1, Frankfurt a.M., D-60438, Germany; Institut für Neuroradiologie, Universitätsklinikum, Goethe-Universität, Schleusenweg 2-15, Frankfurt a.M., D-60528, Germany; Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, Hannover, 30655, Germany; Hessisches Landesamt für Naturschutz, Umwelt und Geologie, Rheingaustraße 186, Wiesbaden D-65203, Germany
推荐引用方式 GB/T 7714	Zulauf G.,Gerdes A.,Hattingen E.,et al. Development of a synorogenic composite sill at deep structural levels of a continental arc (Odenwald, Germany). Part 1: Sederholm-type emplacement portrayed by contact melt in shrinkage cracks[J],2021,805.
APA	Zulauf G..,Gerdes A..,Hattingen E..,Hoefer H.E..,Loeckle F..,...&Zulauf J..(2021).Development of a synorogenic composite sill at deep structural levels of a continental arc (Odenwald, Germany). Part 1: Sederholm-type emplacement portrayed by contact melt in shrinkage cracks.Tectonophysics,805.
MLA	Zulauf G.,et al."Development of a synorogenic composite sill at deep structural levels of a continental arc (Odenwald, Germany). Part 1: Sederholm-type emplacement portrayed by contact melt in shrinkage cracks".Tectonophysics 805(2021).