Episodic rapakivi magmatism due to distal orogenesis?: Correlation of 1.69–1.50 Ga orogenic and inboard, “anorogenic” events in the Baltic Shield

Abstract

Research Article| September 01, 2000 Episodic rapakivi magmatism due to distal orogenesis?: Correlation of 1.69–1.50 Ga orogenic and inboard, "anorogenic" events in the Baltic Shield Karl-Inge Åhäll; Karl-Inge Åhäll 1Earth Sciences Centre, Göteborg University, SE-405 30 Göteborg, Sweden Search for other works by this author on: GSW Google Scholar James N. Connelly; James N. Connelly 2Department of Geological Sciences, University of Texas at Austin, Austin, Texas 78712, USA Search for other works by this author on: GSW Google Scholar Tim S. Brewer Tim S. Brewer 3Department of Geology, University of Leicester, Leicester, LE1 7RH, UK Search for other works by this author on: GSW Google Scholar Geology (2000) 28 (9): 823–826. https://doi.org/10.1130/0091-7613(2000)28<823:ERMDTD>2.0.CO;2 Article history received: 18 Jan 2000 rev-recd: 16 Jun 2000 accepted: 07 Jul 2000 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Karl-Inge Åhäll, James N. Connelly, Tim S. Brewer; Episodic rapakivi magmatism due to distal orogenesis?: Correlation of 1.69–1.50 Ga orogenic and inboard, "anorogenic" events in the Baltic Shield. Geology 2000;; 28 (9): 823–826. doi: https://doi.org/10.1130/0091-7613(2000)28<823:ERMDTD>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGeology Search Advanced Search Abstract The temporal overlap of 1.69–1.55 Ga westward growth of the Baltic Shield and voluminous, episodic, 1.65–1.50 Ga rapakivi magmatism in the Svecofennian domain to the east has long been recognized. New U-Pb data from southwest Sweden indicate that this westward growth occurred in at least three distinct stages involving convergent-margin magmatism (Gothian orogenesis) at 1.69–1.65, 1.62–1.58, and 1.56–1.55 Ga. This improved resolution along the margin reveals an interesting temporal correlation between these events and the intracratonic rapakivi magmatism. Each stage of convergent-margin magmatism was echoed by a phase of bimodal rapakivi magmatism at 1.65–1.62, 1.58–1.56, and 1.55–1.50 Ga. In addition to this temporal correlation, rapakivi suites form distinct north-trending arrays that are subparallel to, but 500–1500 km east of, the active margin. These temporal and spatial links suggest that recurring subduction along oceanward-stepping zones provided first-order control(s) on episodic mantle melting and consequent bimodal rapakivi magmatism in distal, inboard settings. At the very least, emerging constraints from Baltica do not support previous, purely anorogenic models for the 1.65–1.50 Ga rapakivi magmatism or models that singularly implicate lingering effects from the preceding Svecofennian orogeny. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.