Gaoyao-Huilai Deep Fault Zone

The Gaoyao-Huilai Deep Fault Zone is distributed along the Luoding, Gaoyao, Guangzhou, Huiyang, Haifeng, and Huilai lines, and inserts into the Taiwan shallow sea to the east. It is separated by Wuchuan-Sihui, Heyuan, and Lianhua It is divided by fault zones deep in the mountains and the exposure is not very continuous. The fault zone is divided into the eastern section, the middle section and the western section. The eastern section is along the Huiyang-Haifeng-Huilai line and is 200km long. It has a series of east-west positive aeromagnetic anomaly zones along the fault zone, with negative values ??on the south side. The Jurassic period was the most intense. The western section is at the junction of Luoding and Xinyi. It is reversely displaced by the Wuchuan-Sihui Deep Fault Zone. Its latitude is slightly lower. The strata that are displaced include Lower Paleozoic metamorphic rocks, Upper Paleozoic and Cretaceous rocks. epoch rift basin sedimentation. The middle section is sandwiched between the Wuchuan-Sihui and Heyuan deep faults, east of Gaoyao and Guangzhou. It can be seen that the Luofushan fault controls the Dongguan Mesozoic and Cenozoic fault basin. To the west of Guangzhou, geophysical prospecting and drilling have confirmed that this fault is connected to the Sanshui Fault, forming the southern boundary of the Sanshui Basin (Xijiang Fault).

According to the analysis of lithofacies paleogeography and paleotectonic data, the Gaoyao-Huilai Deep Fault Zone was formed during the Indosinian movement and locally controlled the deposition from the Late Triassic to the Early Jurassic. With the advent of the Yanshan Movement, the activity of this fault zone became more intense, and the intrusion of remelting and synmelting granite magma occurred. Following this deep fault zone, the Luodingjiayi, Gaoyao Ma'an-Baitu, Sanshui, Dongguan and other basins developed in the Cretaceous and Paleogene periods. In the Sanshui Basin, the basalt and trachyte (isotopic age 64-47 Ma) seen in Xiqiao Mountain, Zoumaying and boreholes are the products of micro-expansion of intracontinental rifts.