Thermal imprints of Cenozoic tectonic evolution in the Songliao Basin, NE China: Evidence from apatite fission-track (AFT) of CCSD-SK1 borehole

We conduct apatite fission-track analysis in the Songliao Basin to reveal the Cenozoic tectonic uplifts and determine how basin development was associated with the transformation from the Paleo-Pacific plate to the Pacific plate and the change of the Pacific plate velocity. Our results from the CCSD...
Ausführliche Beschreibung

We conduct apatite fission-track analysis in the Songliao Basin to reveal the Cenozoic tectonic uplifts and determine how basin development was associated with the transformation from the Paleo-Pacific plate to the Pacific plate and the change of the Pacific plate velocity. Our results from the CCSD-SK1 boreholes in the northern Songliao Basin reveal three Cenozoic cooling (uplift) events:Paleocene (65–50 Ma), Oligocene (33–22 Ma), late Miocene–Pliocene (14–6 Ma) with the apparent mean exhumation rates of 0.08–0.09 mm/yr, 0.08–0.09 mm/yr and 0.11–0.24 mm/yr, respectively. The total removal of the sedimentary cover resulted from 3 cooling (uplift) events is about 1500 m, the removal by the extreme cooling (uplift) event (14–6 Ma) is about 900 m. In this paper, we infer that the transformation of the Paleo-Pacific plate (Izanagi plate) to the Pacific plate plays the first-order control on the first cooling event (65–50 Ma). The second (33–22 Ma) and third (14–6 Ma) cooling events are closely related to the steady and relatively high motion velocity of the Pacific plate. Since Oligocene, a large scale of tectonic uplifts widely happened not only in basins but also in the ranges around them in northeastern China. Ausführliche Beschreibung