Origin of Late Jurassic<scp>high‐K</scp>felsic volcanic rocks and related Au mineralization in the Dongyang deposit, central‐eastern Fujian,<scp>SE</scp>China, and its tectonic implications

Xu, Zhengying; Yang, Qing‐Fu; Sun, Jing; Lei, Feng‐Zhi; Pan, Xiaodong; Li, Zhong‐Wei

doi:10.1002/gj.3958

Cited by 6 publications

(3 citation statements)

References 88 publications

(168 reference statements)

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“…As Figure 2 shows, the Xinghua Bay Offshore Wind Farm is a prominent offshore wind energy farm in this marine area, comprising 59 turbines with a combined installed capacity of 357.4 megawatts [33]. Tuff from the second member of the Jurassic Nanyuan formation (J 3 n b ) is widely found in this marine area [34], so it is selected and processed as rock samples for this study.…”

Section: Preparation Of Rock Samplesmentioning

confidence: 99%

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Zhang,

Lin

et al. 2023

JMSE

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In recent years, offshore wind turbine technology has been widely developed, making a significant contribution to the advancement of renewable energy. Due to the predominant subsurface geological composition characterized by rocky formations in some marine areas, rock-socketed piles are commonly applied as offshore wind turbine foundations. Generally, rock-socketed piles need to be driven into rock layers that have not undergone significant weathering or erosion for optimal load-bearing capacity. This design is essential to ensure structural support for offshore wind turbines. However, during the long-term operation period of offshore wind turbines, the contact surface between the rock-socketed pile and the rock is prone to be detached under multiple dynamic loads. The generated channel makes seawater seep into the unweathered rock layer, resulting in the erosion of rock meso-structure and deterioration of mechanical properties. The reduced load-bearing capacity will adversely affect the operation of the offshore wind turbine. In this study, the meso-structural evolution of bedrock in pressurized seawater is investigated by X-ray CT imaging using tuff samples from the marine areas of an offshore wind farm in China. A cellular automata model is proposed to predict the long-term evolutionary process of tuff meso-structure. Results indicate that the porosity of the tuff sample in the pressurized seawater shows an upward trend over time. Based on the erosion rate of pores obtained from the CT scanning test, the proposed cellular automata model can predict the evolutionary process of tuff meso-structure and corresponding failure strength of the bedrock in the long term.

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Section: Preparation Of Rock Samplesmentioning

confidence: 99%

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Zhang,

Lin

et al. 2023

JMSE

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“…Some notable regions include Shanghang in the southwest, Jianning in the northwest, Zhenghe-Jian'ou in the north, and Dehua-Youxi-Yongtai in the central-eastern part of the province, all of which have yielded large polymetallic deposits [6][7][8]. The Dehua-Youxi-Yongtai region is commonly referred to as the "Golden Triangle" exploration area, where significant gold mines, such as Ancun, Qiucun, and Shuangqishan, have been discovered [9][10][11][12]. Several scholars have conducted research using geological chronology, fluid inclusion data, and isotope dating, and concluded that the metals in this area originate from magmatic hydrothermal sources [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data

He,

Wang,

Wen

et al. 2023

Minerals

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Epithermal deposits represent a significant category of gold occurrences, with their subsurface structure playing a key role in reserve assessments. Fujian Province, characterized by extensive Mesozoic volcanic activities, stands out as a noteworthy region for shallow hydrothermal mineralization in China. This paper focus on the Youxi area within Fujian Province, employing the dual-frequency induced polarization method (DFIP) and controlled-source audio-frequency magnetotelluric method (CSAMT) to investigate the target ore. The DFIP results revealed predominant northeast-oriented zones with high polarizability and notable apparent resistivity. The CSAMT data were inverted using the SCS2D software. Two-dimensional resistivity profiles reveal a three-layer electrical structure, comprising subsurface banded rhyolites influenced by fault zones, intermediate-low resistivity sandstone layers, and deep-seated high-resistivity conglomerates. The resistivity gradient zones and highly polarizable locations align closely with known local faults. We interpreted these resistivity gradient zones as prospective target areas for mineralization, a hypothesis subsequently validated by drilling results. Combining geochemical analyses of epithermal gold deposits with the electrical resistivity structure, we propose an explanatory model for the mechanism of the formation of epithermal gold–silver deposits in the Youxi area. The magmatic hydrothermal fluids ascended along the fault, underwent convection-driven interaction with meteoric waters, and subsequently metasomatized the host rocks. This integrated approach provides valuable insights into the geological processes governing epithermal gold–silver deposit formation in the Youxi region.

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“…Furthermore, together with the widespread Early Jurassic granitoids in the Great Xing'an, Lesser Xing'an, and Zhangguangcai Ranges (W. C. Ge, Wu, Zhou, & Zhang, 2005;Han et al, 2019;F. Y. Wu, Sun, Jahn, & Wilde, 2004;Z. Xu, Yang, et al, 2020;Z.…”

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confidence: 99%

Geochemistry and zircon U–Pb dating of Early Jurassic syenogranite in the Kaoshan area, southern part of the Zhangguangcai Range, NE China, and tectonic implications

Sun

et al. 2021

Geological Journal

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Kaoshan medium-and fine-grained syenogranites emplaced along the Yitong-Shulan Fault Zone in the southern part the Zhangguangcai Range, central Jilin Province, intruded Middle Triassic granitoids and Carboniferous-Devonian intrusive rocks. They have medium-and fine-grained textures and contain K-feldspar, quartz, plagioclase, and biotite. They are peraluminous (A/CNK = 1.13-1.20) and have high values of SiO 2 (74.60-75.82 wt%), total alkalis (Na 2 O + K 2 O = 8.28-9.18 wt%), light rare earth elements (20.89-56.14 ppm), large-ion lithophile elements, and FeO/ MgO = 2.78-5.93. In contrast, they feature low values of CaO (0.40-0.49 wt%), TiO 2 (0.05-0.14 wt%), P 2 O 5 (0.02-0.04 wt%), Sr (24.20-62.59 ppm), heavy rare earth elements (5.14-11.80 ppm), high-field-strength elements, and δEu (0.41-0.76), and the calculated zircon saturation temperatures (T zr ) range from 804 to 870 C, all of which are similar to the geochemical signatures of anorogenic A 1 -type granites. Zircon U-Pb geochronology analyses from the medium-and fine-grained syenogranites yield concordia ages of 193.18 ± 0.95 Ma (MSWD = 6.7, n = 18) and 190.29 ± 0.92 Ma (MSWD = 8.7, n = 17), respectively, and belong to the Early Jurassic Sinemurian stage. In situ Hf isotope analyses of dated zircons yield ε Hf (t) values ranging from +17.0 to +9.7 and Hf model ages (T DM C ) of 225-614 Ma. Their whole-rock ( 87 Sr/ 86 Sr) i (0.704740-0.704133) and ε Nd (t) values (+2.8 to +0.2) are similar to those of many coeval A 2 -type granites in this region, and they form an Atype granite assemblage. Consequently, the Kaoshan medium-and fine-grained syenogranites were probably derived from partial melting of juvenile lower crust and might be related to the subduction of the Palaeo-Pacific Plate.

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Origin of Late Jurassichigh‐Kfelsic volcanic rocks and related Au mineralization in the Dongyang deposit, central‐eastern Fujian,SEChina, and its tectonic implications

Cited by 6 publications

References 88 publications

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Study on Meso-Structural Evolution of Bedrock Beneath Offshore Wind Turbine Foundation in Pressurized Seawater

Deep Structure of Epithermal Deposits in Youxi Area: Insights from CSAMT and Dual-Frequency IP Data

Geochemistry and zircon U–Pb dating of Early Jurassic syenogranite in the Kaoshan area, southern part of the Zhangguangcai Range, NE China, and tectonic implications

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