河南省魏善城矿集区岩浆活动的两个时期:锆石U-Pb年代学、Hf同位素和岩石地球化学证据

IF 1.4 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Geological Journal Pub Date : 2024-05-14 DOI:10.1002/gj.4978
Cheng-Gui Lin, Jing-Wen Mao, Zhi-Cheng Lü, Zhen-Shan Pang, Jian-Ling Xue, Zhi-Zhong Cheng
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引用次数: 0

摘要

河南省桐柏县魏山城地区是中国重要的金银多金属矿富集区,其特点是长岩分布广泛,岩浆活动频繁。为研究该地区岩浆活动与金、银多金属矿床成矿的成因关系,本研究重点对梁湾深成岩的斑状单斜花岗岩和桃园深成岩的生物花岗岩进行了详细研究。梁湾岩体的锆石U-Pb年龄为128.5 ± 0.7 Ma,其侵入时代为早白垩世。同样,桃源岩体的锆石 U-Pb 年龄为 431.3 ± 2.7 Ma,表明其侵入年龄为早志留纪。岩石地球化学分析表明,梁湾和桃源岩块的SiO2、Na2O和Al2O3含量较高,而MgO、Fe2O3和CaO含量较低,表明属于(高K)钙碱性系列,具有过铝I型花岗岩的性质。稀土元素(REE)总含量较低,轻、重稀土元素之间存在明显的分馏现象,并且存在负的 Eu 异常。高场强元素(如 Nb、Ta、P、Ti)贫化,而大离子亲岩元素(如 Rb、K、Pb)富集。梁湾和桃源岩体的εHf(t)值分别为-16.1至-18.8和11.0至14.6。Hf两阶段模型年龄(TDM2)的平均值分别为603Ma和2230Ma。这些结果表明,梁湾岩块可能是在古新生代伊邪那岐板块俯冲后的伸展构造事件中,由古地壳物质部分熔融形成的。它似乎与矿石集中区的金银矿化密切相关。桃源深成岩可能起源于贫化地幔,并经历了一定程度的地壳污染。然而,它与区域矿化无关。
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Two periods of magmatism in the Weishancheng ore concentration area, Henan Province: Evidences from zircon U-Pb chronology, Hf isotopes and petrogeochemistry

The Weishancheng area of Tongbai County, Henan Province, is an important Au-Ag polymetallic ore concentration area in China, characterized by a widespread distribution of plutons and frequent magmatic activities. To investigate the genetic relationship between magmatism and the mineralization of gold and silver polymetallic deposits in the area, this study focuses on the porphyritic monzogranite of the Liangwan pluton and the biotite granite of the Taoyuan pluton in detail. The zircon U-Pb age of the Liangwan pluton is 128.5 ± 0.7 Ma, placing its intrusion age in the Early Cretaceous. Similarly, the zircon U-Pb age of the Taoyuan pluton is 431.3 ± 2.7 Ma, indicating an intrusion age in the Early Silurian. Petrogeochemical analysis reveals that both the Liangwan and Taoyuan plutons exhibit high SiO2, Na2O and Al2O3 contents, along with low MgO, Fe2O3 and CaO contents, indicating a (high-K) calc-alkaline series, and have the properties of peraluminous I-type granite. The total rare earth elements (REE) concentrations are low, with noticeable fractionation between light and heavy REE, and a negative Eu anomaly. High-field-strength elements (such as Nb, Ta, P, Ti) are depleted, while the large-ion lithophile elements (such as Rb, K, Pb) are enriched. The εHf(t) values of the Liangwan and Taoyuan plutons range from −16.1 to −18.8 and from 11.0 to 14.6, respectively. The mean values of Hf two-stage model ages (TDM2) are 603 Ma and 2230 Ma, respectively. These results suggest that the Liangwan pluton may have formed through partial melting of ancient crustal materials in the Palaeoproterozoic, during extensional tectonic events following the subduction of Izanagi Plate. It appears closely linked to Au-Ag mineralization in the ore concentration area. The Taoyuan pluton likely originated from the depleted mantle and experienced some degree of crustal contamination. However, it is unrelated to regional mineralization.

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来源期刊
Geological Journal
Geological Journal 地学-地球科学综合
CiteScore
4.20
自引率
11.10%
发文量
269
审稿时长
3 months
期刊介绍: In recent years there has been a growth of specialist journals within geological sciences. Nevertheless, there is an important role for a journal of an interdisciplinary kind. Traditionally, GEOLOGICAL JOURNAL has been such a journal and continues in its aim of promoting interest in all branches of the Geological Sciences, through publication of original research papers and review articles. The journal publishes Special Issues with a common theme or regional coverage e.g. Chinese Dinosaurs; Tectonics of the Eastern Mediterranean, Triassic basins of the Central and North Atlantic Borderlands). These are extensively cited. The Journal has a particular interest in publishing papers on regional case studies from any global locality which have conclusions of general interest. Such papers may emphasize aspects across the full spectrum of geological sciences.
期刊最新文献
Issue Information RETRACTION: Structural Characteristics and Development Model of Fluid Diapirs Within the Structural Transition Zone, Northern South China Sea Issue Information Hf Isotopes and Detrital Zircon Geochronology of the Silasia Formation, Midyan Terrane, Northwestern Arabian Shield: An Investigation of the Provenance History Ramp Depositional Model in an Intracratonic Basin: The Cambrian Sedimentary Successions in Yanshan Area, North China
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