Affordable Access

Access to the full text

Timescales from magma mixing to eruption in alkaline volcanism in the Eifel volcanic fields, western Germany

Authors
  • Sundermeyer, Caren1
  • Gätjen, Jochen1
  • Weimann, Lena1
  • Wörner, Gerhard1
  • 1 Georg-August Universität, Göttingen, Germany , Göttingen (Germany)
Type
Published Article
Journal
Contributions to Mineralogy and Petrology
Publisher
Springer-Verlag
Publication Date
Jul 25, 2020
Volume
175
Issue
8
Identifiers
DOI: 10.1007/s00410-020-01715-y
Source
Springer Nature
Keywords
License
Green

Abstract

Diffusion profiles in olivine crystals from the final mafic eruption products of the compositionally zoned Laacher See tephra deposit were measured to identify recharge and eruption-triggering events prior to the eruption of the Laacher See volcano (12.9 kyr). These products represent the hybrids of mixing between phonolite and intruding basanite at the bottom of the reservoir, which is likely related to the eruption-triggering event. Additionally, olivine crystals from ten basanitic scoria cones and maar deposits (East Eifel) and two nephelinites (West Eifel) were analyzed to constrain histories of olivine in Quaternary basanite magmas. Olivine crystals from the Laacher See hybrids vary in core composition (Fo83–89) and show reversely zoned mantles with high Fo87.8–89 compared to olivine in East Eifel basanites erupted in nearby, older scoria cones. Towards the crystal margin, olivine in the hybrids develop a normally zoned overgrowth (Fo86.5–87.5). Olivine from East Eifel basanites show similar zonation and core compositions (Fo80–88) but have less forsteritic mantles (Fo83–88) indicating that these basanites are less primitive than those recharging the Laacher See reservoir (> Fo89). Olivine in the West Eifel nephelinites show mantles similar to those from Laacher See (Fo87.5–90), but have normal zoning and high-Fo cores (Fo88–92). This indicates that olivine in the Laacher See hybrids were entrained by a near-primary basanite from older cumulates just before hybridization of the basanite with the phonolite. Diffusion modeling indicates maximum timescales between entrainment and eruption of Laacher See of 30–400 days that are comparable to those calculated for olivine from basanitic scoria cones (10–400 days).

Report this publication

Statistics

Seen <100 times