<正>Objective Two important geological issues have long been controversial in the Xing–Meng area of North China.The first concerns the final closure of Paleo-A
Egyptian beach ilmenite occurs in a relatively high content in the naturally highly concentrated superficial black sand deposits at specific beach zones in the
The Guanzhong Basin in the transitional zone of theQinling orogenic belt and the southern margin of theOrdos Basin has been extensively studied in recent years.
The Permian global mass extinction events and the eruption of the Emeishan flood basalts in the Upper Yangtze region should display certain responses during the