Phanerozoic tectonics of the South China Block: Key observations and controversies

https://hal-insu.archives-ouvertes.fr/insu-00509100/document

Structural development of the Lower Paleozoic belt of South China: Genesis of an intracontinental orogen

https://hal-insu.archives-ouvertes.fr/insu-00576470/document

Geochronological and geochemical features of the Cathaysia block (South China): New evidence for the Neoproterozoic breakup of Rodinia

[1] Zircon U-Pb geochronological data on over 900 zircon grains for Cambrian to Silurian sandstone samples from the South China Block constrain the pre-Devonian tectonic setting of, and the interrelationships between, the constituent Cathaysia and Yangtze blocks. Zircons range in age from 3335 to 465 Ma. Analyses from the Cathaysia sandstone samples yield major age clusters at ∼2560, ∼1850, ∼1000, and 890–760 Ma. Zircons from the eastern and central Yangtze sandstone samples show a similar age distribution with clusters at ∼2550, ∼1860, ∼1100, and ∼860–780 Ma. A minor peak at around 1450 Ma is also observed in the Cathaysia and central Yangtze age spectra, and a peak at ∼490 Ma represents magmatic zircons from Middle Ordovician sandstone in the eastern Yangtze and Cathaysia blocks. The Cambrian and Ordovician strata show a transition from a carbonate-dominated succession in the central Yangtze Block, to an interstratified carbonate-siliciclastic succession in the eastern Yangtze Block, to a neritic siliciclastic succession in the Cathaysia Block. Paleocurrent data across this succession consistently indicate directions toward the W-NNW, from the Cathaysia Block to the Yangtze Block. Our data, together with other geological constraints, suggest that the Cathaysia Block constitutes a fragment on the northern margin of east Gondwana and both Cathaysia and east Gondwana constituted the source for the analyzed early Paleozoic samples. The similar age spectra for the Cambrian to Silurian sandstone samples from the Yangtze and Cathaysia blocks argue against the independent development and spatial separation of these blocks in the early Paleozoic but rather suggest that the sandstone units accumulated in an intracontinental basin that spanned both blocks. Subsequent basin inversion and Kwangsian orogenesis possibly at 400–430 Ma also occurred in an intracontinental setting probably in response to the interaction of the South China Block with the Australian-Indian margin of east Gondwana.

Tectonic setting of the South China Block in the early Paleozoic: Resolving intracontinental and ocean closure models from detrital zircon U‐Pb geochronology

https://hal-insu.archives-ouvertes.fr/insu-00796995/document

The Neoproterozoic-Early Paleozoic tectonic evolution of the South China Block: An overview

The pre-Devonian tectonic patterns and evolution of South China

Preliminary Study of the Terranes in West Sichuan

Crustal genesis and plate tectonics

The Lujiang—Zongyang volcano—structural depression resulted from the combined action of tectonism and volcanism. Its evolution progressed through five stages from 190 to 105 Ma B.P., during which nine types of metal and pyrite deposits were formed. These deposits show obvious regularities in the temporal—spatial distribution and have certain genetic relation, forming a minerogenetic series related to shoshonite within or around the volcano—structural depression on the basement that sank for a long period of time. This paper suggests a four—dimensional model of the formation and evolution of a typical volcano—structural depression and its related mineralizalion in a transition belt from the active margins to the inner part of a plate under alternating shear—compressive and shear—extensional stress conditions, but predominantly shear—extensional stress conditions.

Dong Huogen

Papers

The pre-Devonian tectonic patterns and evolution of South China

Preliminary Study of the Terranes in West Sichuan

Crustal genesis and plate tectonics

The Formation and Evolution of the Lujiang—Zongyang Volcano—Structural Depression in Anhui and Its Relation to Mineralization