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- Title
Coupling Between Exhumation and Subduction: A Case Study From the Southern Great Xing'an Range, NE Asia.
- Authors
Wu, Didi; Li, Shan; Dias, A. N. C.; Chew, David
- Abstract
The link between subduction and continental exhumation is explored using high‐resolution thermal histories from southern Great Xing'an Range (GXR), NE Asia and integrated with a regional low‐temperature thermochronology data synthesis from the NE Asian continental margin. The GXR thermal histories are constrained by multiple thermo‐, geochronometers (zircon, titanite, apatite U‐Pb, zircon, apatite (U‐Th)/He and apatite fission track). These data yield a large range in U‐Pb ages (292–119 Ma) with enhanced exhumation mainly during the early Cretaceous (ca. 155–110 Ma) in an extensional regime linked to roll‐back of the Paleo‐Pacific Ocean and consequent lithospheric thinning and delamination. Integrated with Cretaceous‐Cenozoic low‐temperature thermochronological data from the NE Asian continent margin, three regional phases of exhumation are recognized, which can be linked to changes in the geometry and kinematics of the subduction systems of the Paleo‐Pacific and Pacific oceans, demonstrating coupling between the subducting plate and the continental margin at active plate boundaries. Plain Language Summary: Thermochronological data sets enable orogen‐scale investigations into the spatio‐temporal patterns of exhumation on continental margins, and provide additional constraints on how the tectonic evolution of the crust is controlled by subduction. We employ geochronology (zircon U‐Pb), low‐temperature thermochronology (zircon, apatite (U‐Th)/He) and medium‐high temperature thermochronology (titanite, apatite U‐Pb) data to model the thermal evolution histories of the southernmost segment of the GXR in NE China. The inverse modeling results show rapid cooling and exhumation from ca. 155–110 Ma. This coincides with the initiation of slab roll‐back of the Paleo‐Pacific Ocean in NE Asia, which was responsible for cooling and exhumation in an extensional regime. In addition, we compile the available low‐temperature thermochronology data (zircon, apatite fission track and (U‐Th)/He) from the NE Asian continental margin from Late Cretaceous (ca. 110 Ma) to constrain regional exhumation events. These data show three main exhumation phases from the Late Cretaceous onwards. Combined with the data on the regional evolution of magmatism, sedimentary basins and deformation, the three exhumation phases can be linked to changes in the geometry of the Paleo‐Pacific ocean and Pacific ocean plates in NE Asia, thus showing coupling between continental exhumation and subduction. Key Points: The southernmost Great Xing'an Range experienced rapid cooling and exhumation during Early Cretaceous accompanied by voluminous magmatismA synthesis of low‐temperature thermochronology data from NE Asia shows three pulses of Mesozoic to Cenozoic exhumationThree exhumation phases on the East Asia margin are linked to subduction of the Paleo‐Pacific Ocean/Pacific Ocean from the late Early Cretaceous
- Subjects
ASIA; EXHUMATION; OROGENIC belts; SUBDUCTION; TECTONIC exhumation; CONTINENTAL margins; SEDIMENTARY basins; SPHENE; GEOLOGICAL time scales; OROGENY
- Publication
Geophysical Research Letters, 2023, Vol 50, Issue 24, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2023GL105321