The Uplift and Denudation History of the Jianfeng Pluton on Hainan Island, China

Minerals, Journal Year: 2025, Volume and Issue: 15(3), P. 320 - 320

Published: March 19, 2025

Hainan Island is the only large island located on northern margin of South China Sea and surrounded by Cenozoic graben basins, including Qiongdongnan, Yinggehai, Beibuwan basins. The uplift denudation history Jianfeng pluton southwestern significant for understanding formation regional geomorphology adjacent basin evolution. This paper presents apatite zircon fission-track (FT) analyses conducted pluton. FT (ZFT) ages range are from 63 ± 4 to 108 8 Ma, (AFT) 19.4 1.8 43.9 4.4 Ma. average confined track lengths in relatively short (11.9–12.8 μm). An age–elevation plot indicates that two rapid cooling events occurred during 73–63 44–40 Thermal modeling revealed four stages 40–11 11–0 From Late Cretaceous middle Eocene (73–40 Ma), area underwent episodic denudation. At end (73–63 was affected mid-ocean ridge spreading Proto-South Sea. During (44–40 Yinggehai Basin abrupt expansion subsidence, which increased elevation difference between Basin. Miocene (40–11 slow denudation, rapidly infilled, eliminated original areas. present (11–0 has undergone reactivated driven remote effects India–Eurasia collision.

Language: Английский

Quantitative analysis of the fluvial geomorphology and erosion on Hainan island: implications for the source-to-sink system in the NW South China Sea

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Sept. 30, 2024

The sediment delivery from Hainan island into the NW South China Sea during Quaternary is less well-defined. An investigation uplift, exhumation and fluvial geomorphology of crucial for improving our understanding on source-to-sink system in this region. In study, we employed digital elevation analysis, stream power incision model cosmogenic nuclide isotope analysis to unravel how why provide Sea. results show that average HI values main catchments are below 0.35, which indicates rivers tend be stable. After mapping channel steepness index island, a high constrained central western island. χ shows minor variations across except watershed between Wanquanhe Nandujiang rivers, as well Changhuajiang potential migration river watersheds here. addition, carried out 10 Be sand spatial distribution concentrations identified west low east. catchment-averaged erosion rates quantified 35 m/Myr, 42.5 m/Myr 69.9 Changhuajiang, Lingshuihe catchments, respectively. We also estimated deliveries Qiongdongnan Yinggehai Basins 0.46 Mt/yr, 0.45 Mt/yr 0.21 compared rate estimates with those Taiwan concluded difference pattern evolution islands may associated variation tectonics. Our will improve systems

Language: Английский