Pulsatile extractions of Lower Cretaceous silicic volcanic plumbing system beneath the Baiyunzhang and Lianhuashan Basins, eastern Guangdong: silicic magma evolution and related mineralization

IF 2.6 3区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of the Geological Society Pub Date : 2024-06-03 DOI:10.1144/jgs2024-049

Jianqiang He, Yan Xia, Xisheng Xu, Hongyang Shi, Jiaqi Gu

{"title":"Pulsatile extractions of Lower Cretaceous silicic volcanic plumbing system beneath the Baiyunzhang and Lianhuashan Basins, eastern Guangdong: silicic magma evolution and related mineralization","authors":"Jianqiang He, Yan Xia, Xisheng Xu, Hongyang Shi, Jiaqi Gu","doi":"10.1144/jgs2024-049","DOIUrl":null,"url":null,"abstract":"\n Highly differentiated magmas are closely related to the formation of tin deposits. The Lianhuashan Basin and Baiyunzhang Basin, surrounded by multiple coeval tin deposits, developed various types of volcanic and subvolcanic rocks. The diagenetic connections between different types of rocks within the two basins will provide new insight on the silicic magma systems evolution and the impact of highly differentiated magmas on tin mineralization. Both basins have consistent zircon U-Pb ages (143 ∼ 138 Ma) and similar whole-rock Nd isotopes (\n ε\n Nd\n (\n t\n ) = -5.7 ∼ -3.4) and zircon Hf-O isotopes ranges (\n ε\n Hf\n (\n t\n ) = -9.0 ∼ -2.5;\n δ\n 18\n O = 5.1 ∼ 7.9), suggesting both basins originate from the same deep-level magma reservoir, followed by different degrees of crystal differentiation and several episodes of crystal-melt separation in their respective shallow-level magma reservoirs. The multiple pulses of magma extraction eventually produced different volcanic rocks, granite porphyry and rhyolite porphyry, while the remaining crystal mush consolidated in situ to form quartz monzonite porphyry. Further studies show that the tectonic regime changed from a compressive to an extensional environment at ∼140 Ma. Consequently, mantle-derived magmas with low oxygen fugacity injected shallow magma reservoirs that able to evolve to a high degree of differentiation through multiple recharge, thus favoring the formation of the Sn deposit.\n \n \n Supplementary material:\n https://doi.org/10.6084/m9.figshare.c.7258282\n","PeriodicalId":17320,"journal":{"name":"Journal of the Geological Society","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Geological Society","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/jgs2024-049","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Highly differentiated magmas are closely related to the formation of tin deposits. The Lianhuashan Basin and Baiyunzhang Basin, surrounded by multiple coeval tin deposits, developed various types of volcanic and subvolcanic rocks. The diagenetic connections between different types of rocks within the two basins will provide new insight on the silicic magma systems evolution and the impact of highly differentiated magmas on tin mineralization. Both basins have consistent zircon U-Pb ages (143 ∼ 138 Ma) and similar whole-rock Nd isotopes ( ε Nd ( t ) = -5.7 ∼ -3.4) and zircon Hf-O isotopes ranges ( ε Hf ( t ) = -9.0 ∼ -2.5; δ 18 O = 5.1 ∼ 7.9), suggesting both basins originate from the same deep-level magma reservoir, followed by different degrees of crystal differentiation and several episodes of crystal-melt separation in their respective shallow-level magma reservoirs. The multiple pulses of magma extraction eventually produced different volcanic rocks, granite porphyry and rhyolite porphyry, while the remaining crystal mush consolidated in situ to form quartz monzonite porphyry. Further studies show that the tectonic regime changed from a compressive to an extensional environment at ∼140 Ma. Consequently, mantle-derived magmas with low oxygen fugacity injected shallow magma reservoirs that able to evolve to a high degree of differentiation through multiple recharge, thus favoring the formation of the Sn deposit. Supplementary material: https://doi.org/10.6084/m9.figshare.c.7258282

查看原文本刊更多论文

粤东白云章盆地和莲花山盆地下白垩系下统硅质火山岩脉动提取：硅质岩浆演化及相关成矿作用

高分异性岩浆与锡矿床的形成密切相关。莲花山盆地和白云漳盆地被多个共生锡矿床包围，发育有不同类型的火山岩和次火山岩。两个盆地内不同类型岩石之间的成岩联系将为硅质岩浆系统演化以及高分异性岩浆对锡成矿的影响提供新的见解。两个盆地具有一致的锆石U-Pb年龄（143 ∼ 138 Ma）和相似的全岩钕同位素（ε Nd ( t ) = -5.7 ∼ -3.4）和锆石Hf-O同位素范围（ε Hf ( t ) = -9.0 ∼ -2.5; δ 18 O = 5.1 ∼ 7.9），表明这两个盆地起源于同一深部岩浆储层，随后在各自的浅部岩浆储层中发生了不同程度的晶体分异和多次晶体-熔体分离。岩浆的多次萃取最终形成了不同的火山岩--花岗斑岩和流纹斑岩，而剩余的晶泥则在原地固结形成了石英斑岩。进一步的研究表明，在 ∼140 Ma 时，构造体系从压缩环境转变为延伸环境。因此，低氧富集的地幔岩浆注入浅层岩浆储层，通过多次补给，演化出高度分异的岩浆，从而有利于硒矿床的形成。补充材料：https://doi.org/10.6084/m9.figshare.c.7258282

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of the Geological Society 地学-地球科学综合

CiteScore

6.00

自引率

3.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Journal of the Geological Society (JGS) is owned and published by the Geological Society of London. JGS publishes topical, high-quality recent research across the full range of Earth Sciences. Papers are interdisciplinary in nature and emphasize the development of an understanding of fundamental geological processes. Broad interest articles that refer to regional studies, but which extend beyond their geographical context are also welcomed. Each year JGS presents the ‘JGS Early Career Award'' for papers published in the journal, which rewards the writing of well-written, exciting papers from early career geologists. The journal publishes research and invited review articles, discussion papers and thematic sets.