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- Title
Palaeozoic uplands and unconformity in the North China Block: constraints from zircon LA-ICP-MS dating and geochemical analysis of Bauxite.
- Authors
Yu Wang; Liyun Zhou; Lijun Zhao; Mo Ji; Honglei Gao
- Abstract
Terra Nova, 22, 264–273, 2010 The problem of location of the North China Block (NCB) during the Palaeozoic and its history of uplift and erosion have not been established satisfactorily. A regional unconformity was developed in the NCB between the Upper Ordovician and the Middle–Upper Carboniferous. Zircon grains in the samples collected for isotopic age-dating from the unconformable surface in central North China show two main clusters of ages around c. 444 and c. 313 Ma, and a scatter of ages between c. 2500 and c. 550 Ma. Silurian and Devonian ages were not observed. Similarities between the zircon rare earth element and trace elements show that the c. 444- and c. 313-Ma zircon grains were derived from rocks in the active margins of the NCB. Geological and isotopic evidence suggests that between c. 444 and 312 Ma, North China was uplifted, and that there was a long gap in sedimentation. This major change in the environment of North China, from marine to continental upland, occurred at the same time as the separation of North China from northern Gondwana, the closure of the northern Palaeotethys along the Altai–Inner Mongolia zone and the collision between Gondwana and Laurasia. Terra Nova, 00, 1–10, 2010
- Subjects
CHINA; PALEOGENE stratigraphic geology; UNCONFORMITIES (Geology); UPLANDS; ZIRCON; CARBONIFEROUS stratigraphic geology
- Publication
Terra Nova, 2010, Vol 22, Issue 4, p264
- ISSN
0954-4879
- Publication type
Article
- DOI
10.1111/j.1365-3121.2010.00942.x