A multi-system geochronology in the Ad-3 borehole, Pannonian Basin (Hungary) with implications for dating volcanic rocks by low-temperature thermochronology and for interpretation of (U-Th)/He data
Access Status
Authors
Date
2015Type
Metadata
Show full item recordCitation
Source Title
ISSN
School
Collection
Abstract
Independent geochronological and thermal modelling approaches are applied to a biostratigraphically exceptionally well-controlled borehole, Alcsútdoboz-3 (Ad-3), in order to constrain the age of Cenozoic geodynamic events in the western Pannonian Basin and to test the efficacy of the methods for dating volcanic rocks. Apatite fission track and zircon U-Pb data show two volcanic phases of Middle Eocene (43.4-39.0 Ma) and Early Oligocene (32.72 ± 0.15 Ma) age respectively. Apatite (U-Th)/He ages (23.8-14.8 Ma) and independent thermal and subsidence history models reveal a brief period of heating to 55-70 °C at ~17 Ma caused by an increased heat-flow related to crustal thinning and mantle upwelling. Our results demonstrate that, contrary to common perception, the apatite (U-Th)/He method is likely to record 'apparent' or 'mixed' ages resulting from subsequent thermal events rather than 'cooling' or 'eruption' ages directly related to distinct geological events. It follows that a direct conversion of 'apparent' or 'mixed' (U-Th)/He ages into cooling, exhumation or erosion rates is incorrect.
Related items
Showing items related by title, author, creator and subject.
-
Aciego, S.; Jourdan, Fred; DePaolo, D.; Kennedy, B. (2010)Late Quaternary, post-shield lavas from the Mauna Kea and Kohala volcanoes on the Big Island of Hawaii have been dated using the 40Ar/39Ar and U–Th/He methods. The objective of the study is to compare the recently ...
-
Danisik, Martin; Pfaff, K.; Evans, Noreen; Manoloukos, C.; Staude, S.; McDonald, B.; Markl, G. (2010)Exceptionally large, U-rich apatite from the Schwarzwald ore district (Germany) was triple dated using ID-TIMS U-Pb, fission track (FT) and (U-Th)/He dating methods. The aim of adopting the multi-dating approach on a ...
-
Li, G.; Cao, M.; Qin, K.; Evans, Noreen; McInnes, Brent; Liu, Y. (2013)Understanding postmineralization tectonic movements in porphyry deposits, is critical to interpreting the complete thermal-tectonic history. This study reports new zircon U–Pb ages, hydrothermal biotite 39Ar/40Ar age, and ...