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Mengshan granitoid complex, Yushui District, Xinyu, Jiangxi, Chinai

Regional Level Types
Mengshan granitoid complex	Complex
Yushui District	District
Xinyu	Prefecture
Jiangxi	Province
China	Country

The area where the Mengshan granitoid complex is located exposes strata from the late Paleozoic to the Cenozoic, mainly including Carboniferous, Permian, Triassic, Jurassic, Cretaceous, and Quaternary. The Carboniferous strata are mainly siltstone, silty mudstone, dolomite, and limestone. The Permian strata include carbonate rocks such as limestone and dolomite, and siliceous rock. The Triassic strata are mainly sedimentary rocks such as conglomerate, sandstone, mudstone, and siltstone. The Cretaceous strata include mudstone, gravel-bearing siltstone, and conglomerate. The Quaternary strata are distributed in modern river depressions and comprise sand, gravel, and sub-clay layers.
The Mengshan granitoid complex is elliptical and has an exposed area of 39 square kilometers. Surrounding the complex is a metamorphic halo formed via obvious hydrothermal replacement and thermal metamorphism, in which skarn-type deposits are distributed. Two phases of magmatic intrusion formed it, the first phase being Triassic granite (~217 to ~236 Ma) and the second phase being Jurassic–Cretaceous dykes (~135 Ma to ~142 Ma). The first phase of magmatic intrusion can be divided into three stages. The first stage is white medium–coarse-grained porphyritic biotite granite, with an age of 236–223 Ma; the second stage is flesh-red biotite granite, with an age of 222–220 Ma; the third stage is gray-white fine-grained granite, with an age of 218–217 Ma.

Other Regions, Features and Areas containing this locality

References

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