Shallow Thermal Anomalies and Their Role in the Breakup Evolution Along the Conjugate Margins of the Fram Strait (Svalbard and Eastern North Greenland), Indicated by Low‐Temperature Thermochronology

Author:

Meier Katrin12ORCID,O’Sullivan Paul3ORCID,Jochmann Malte M.45ORCID,Wallrath Tino1,Monien Patrick1ORCID,Piepjohn Karsten6ORCID,Lisker Frank1ORCID,Spiegel Cornelia1ORCID

Affiliation:

1. Department of Geosciences University of Bremen Bremen Germany

2. State Museum of Natural History Karlsruhe (SMNK) Karlsruhe Germany

3. GeoSep Services Moscow ID USA

4. Department of Arctic Geology University Centre in Svalbard (UNIS) Longyearbyen Norway

5. Department of Earth Sciences University of Bergen Bergen Norway

6. Federal Institute for Geosciences and Natural Resources (BGR) Hannover Germany

Abstract

AbstractWe investigated highly mature sedimentary rocks exposed along both sides of the Fram Strait in the northern North Atlantic using apatite fission track and (U‐Th)/He thermochronology to obtain information on the thermal imprint of rifting and continental breakup processes along a sheared margin. Our data showed that the conjugate margins experienced several heating episodes, which we explain as resulting from heat transfer along segments of the De Geer Fracture Zone, a large continental transform system which connected magmatic centers north and south of the Fram Strait. Heating occurred prior to and during the Eurekan intraplate orogeny, which occupied the position of the present‐day Fram Strait during the Eocene. Heat transfer may have caused or contributed to lithospheric weak zones, which focussed deformation during intraplate orogeny. Movements along the transform fault system continued during the Oligocene, after the end of the Eurekan Orogeny, causing further structural weakening of pre‐existing fault zones. These were exploited during the final continental breakup leading to the opening of the Fram Strait. No unambiguous thermal signature associated with this latest stage of breakup was detected. Our data underline recent studies on the importance of structural inheritance and continental transform faults for the prolonged and complex processes of continental rifting and breakup.

Funder

Deutsche Forschungsgemeinschaft

Publisher

American Geophysical Union (AGU)

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