Mesozoic granitic magmatism in Northeastern Jiangxi, China is of tectonic significance for the evolution of the South China Block. Whole-rock geochemical and zircon U–Pb geochronological and Lu–Hf isotopic data for Mesozoic Zhuxi granites in the Jingdezhen area of Northeastern Jiangxi were presented. The Zhuxi granites are composed of granodiorite, biotite granite, and two-mica granite. Zircon LA–ICP–MS U–Pb isotopic analyses indicated emplacement at 159–147 Ma. The granites are characterized by a strongly peraluminous nature with high A/CNK values (>1.1), high SiO₂ (66.09–74.46 wt.%) and K₂O (3.50–5.52 wt.%) contents, depletion in Ba, Nb, Ce, Sr, and Ti, moderately negative Eu anomalies (Eu/Eu* = 0.40–0.63), enrichment in LREE, and depletion in HREE ((La/Yb)_N > 7.43). The A/CNK > 1.1, widespread aluminum-rich minerals (e.g., muscovite and tourmaline), indicating they are S–type granites and belong to muscovite–bearing peraluminous granites (MPG). The Zhuxi granites exhibited negative εHf(t) values (−9.9 to −3.7) and the T_DM2 model ages of 1840–1442 Ma indicated derivation from ancient crustal sources. The magma is possibly caused by the subsequent process of intracontinental subduction. It is inferred that the Mesozoic magmatism in Northeastern Jiangxi was associated with oceanic–continental convergence of the Paleo–Pacific and Eurasian plates as well as the intracontinental subduction of the Yangtze and Cathaysia blocks. The Zhuxi granites highlight the primary role of oceanic–continental convergence and intracontinental subduction in early Yanshanian granitoid magmatism in South China.

The properties of the Caledonian orogeny along the transition belt of the Yangtze and Cathaysia blocks have received much attention in recent years. The widespread Early Paleozoic granites provide critical geological clues for unraveling the tectonic evolution and geodynamic processes of the South China Continent (SCC). Here we present new zircon U–Pb chronology, whole-rock major and trace elements, in situ Hf isotopes for Paleozoic granites, i.e., the Wugongshan granites in the northwest Jiangxi province, and aim to explore the magmatism and properties of the Caledonian orogeny involved in their formation. Our new data show that the Wugongshan granites were emplaced during the Early Silurian Period (442–438 Ma). The Paleozoic Wugongshan granites belong to S-type muscovite-bearing peraluminous granites (MPG) and show a single origin. The Wugongshan granites exhibit negative εHf(t) values (−11.56 to −6.19) and TDM2 model ages of 2148–1809 Ma, indicating their derivation from an ancient crustal source, through partial melting of ancient crustal material. The Wugongshan granitic magmatism is probably being generated in an extensional environment related to an intracontinental orogeny setting. It is inferred that the Paleozoic tectonic–magmatic event in the Wugongshan area was associated with the oceanic–continental convergence of the Paleo-Tethys Ocean. The Wugongshan granites highlight the intracontinental magmatism in the Early Paleozoic orogeny in the SCC.

The Jiadi gold deposit, situated in the Southwestern region of Guizhou, is a large-scale, recently discovered, basalt-hosted, and fine-grained disseminated gold deposit. This study has unveiled that the tectonic deformation of the Jiadi gold deposit can be categorized into four stages: the Late Paleozoic crustal uplift and brittle deformation (D1-deformation) stage; the Early Yanshanian NW-trending compressive ductile deformation (D2-deformation) stage; the Late Yanshanian NS-trending strike-slip fault (D3-deformation) stage; and the Himalayan EW-trending nappe structure (D4-deformation) stage. The outcomes of the C-O isotope analysis revealed that the fluid responsible for ore formation exhibits the attributes of magmatic water blended with meteoric water, and the metallogenic constituents primarily originate from a deep source. The formation of the Jiadi gold deposit occurred during the D2-deformation stage and extended to the D3-deformation stage. The D2-deformation stage induced hydrothermal activity and rock devolatilization, leading to the generation of CO₂-rich and low-salinity fluids. The D3-deformation stage, which is intimately associated with mineralization, can be classified into three stages: the pyrite stage; the smoky quartz stage; and the sulfide stage. The findings obtained from laser Raman spectroscopy indicate that the inclusions typically comprise CO_2, CH₄, N₂, and SO₂. These deep fluids ascended along the fault to the interlayer fracture zone during the D3-deformation stage. The alteration of the geochemical environment was accompanied by fluid immiscibility or boiling, resulting in the rapid precipitation of metallogenic materials.

The Kuche Depression, is an E-W trending foreland basin located at the South margin of the Tianshan Orogenic Belt. The Ridalike uranium deposit is located in the western Qiulitage fold-and-thrust belt of the Kuche Depression, and the uranium ore bodies are mainly preserved in the sandstones of the Pliocene Kuche Formation (N2k). The Kuqa Formation is a set of yellow oxidized sandstone layers formed in a semi-arid climate, but the grey layer is developed in Qiulitage fold-and-thrust belt, and uranium mineralization mainly deposit on the grey fluvial sandstone. According to the characteristics of the growth strata and the spatial cutting relationship between the strata in the Kuche Formation in the Qiulitage area, we conclude that the deformation age of the western Qiulitage anticline is between 5 ~ 2.5Ma and during the deposition of the upper part of Kuche Formation (N2k) and Early Pleistocene. Two stages of structure deformation can be identified in Ridalike area: type 1 is mainly composed of the fold-related faults, which developed between Paleogene and the early Pleistocene. The general strike of the axial plane of the type 1 fold and the related faults is near the E-W direction, and the local direction is slightly changed to NEE or SWW direction, which reflects the maximum principal compressive stress in approximately N-S direction. The type 2 structural deformation was mainly developing in the Early Pleistocene Xiyu conglomerate, and the outcrop appeared as a geomorphic escarpment. The surface outcrops of type 2 structure deformation can be observed in the Xiyu conglomerate on the North area of the Ridalik deposit, showing a series of fault escarpment, and normal faults with their associated reverse faults. According to the field structural deformation characteristics, it is inferred that the active age of the fault occurred after the early Pleistocene, which is a late tectonic event in the region. In the central and western Qiulitage fold-and-thrust belt, field investigation of the Kuche Formation (N2k) revealed "reversed" interlayer oxidation zones and "inverted roll" orebodies. The interlayer oxidation zone is widely developed from the Southern Tianshan Mountains along the Muzhaerte River basin to the southeast direction. The oxidized containing uranium fluid infiltrates into the target sandstone band of the Kuche Formation through the surface outcrops or the Windows under the loose quaternary sandstone, and the flow distance is approximately 50~60km, and the scale of the interlayer oxidation zone is large-scale. During this process, an oxidation zone containing uranium-containing fluid flowed through the Kuche depression and reached Qiulitage area. After surface denudation, the oxidation zone partially uplifted out of the surface, forming the present form of an "inverted" interlayer oxidation zone. The uranium ore body controlled by the interlayer oxidation zone has a normal rolled ore body, an inverted rolled ore body, and a double rolled ore body. In the NW direction of Ridalike uranium deposit, the Meso-Cenozoic fault system is scanty, which did not obstruct the flow of groundwater. Therefore, this study supported the genetic model of Ridalike uranium deposit as a "Trans-basin metallogenic model".