P-T paths in the Hond̈l area, central Scandinavia; record of Caledonian accretion of outboard rocks to the Baltoscandian margin

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Authors:Bergman, S.
Author Affiliations:Primary:
Uppsala Univ., Dep. Mineral. and Petrol., Uppsala, Sweden
Volume Title:Journal of Metamorphic Geology
Source:Journal of Metamorphic Geology, 10(2), p.265-281. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0263-4929
Publication Date:1992
Note:In English. 51 refs.; illus. incl. 25 anal., 3 tables, geol. sketch map
Summary:The Seve-Koli nappe complex extends over a wide area in the Scandinavian Caledonides and is composed of units representing parts of the Baltoscandian margin (Seve nappes) now overlain by magmatic and sedimentary rocks (Koli nappes) derived from west of this margin. Thermobarometry in the Handol area constrains metamorphic conditions to 490-570 degrees C, 950-600 MPa, with a slight downwards increase in grade, for the lower Koli; 520-620 degrees C, 1000-600 MPa for the upper Seve; 630-740 degrees C, 750- 650 MPa for the middle Seve, and 480-600 degrees C, 1150-1000 MPa for the lower Seve. P-T paths during garnet growth record heating at the base of the Koli and cooling in the underlying Seve units; P increase during garnet growth is indicated for all units, leading to anticlockwise P-T paths in the Seve. These results imply thermal convergence with time for all units and spatial convergence in metamorphic grade in the Koli. It is suggested that the contrasting metamorphic histories on either side of the Seve- Koli boundary resulted from the emplacement of relatively colder Koli rocks on top of relatively hotter Seve rocks and that emplacement of structurally higher units contributed to the increase in P. [R.A.H.]
Subjects:Accretion; Caledonian Orogeny; Interpretation; Metamorphism; P-T conditions; Paleozoic; Petrology; Europe; Koli Nappe; Scandinavia; Sweden; Western Europe; Central Scandinavia; Handol; West-central Sweden
Coordinates:N630000 N633000 E0110000 E0100000
Abstract Numbers:92M/4916
Record ID:1992057149
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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