鄂东南石头咀矽卡岩型Cu-Fe矿床石榴子石原位成分、U-Pb测年及其地质意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

鄂东南石头咀矽卡岩型Cu-Fe矿床石榴子石原位成分、U-Pb测年及其地质意义

In situ composition and U-Pb dating of garnets from the Shitouzui Cu-Fe skarn deposit in southeastern Hubei Province and its geological implications

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DOI	10.20086/j.cnki.yskw.2025.4101
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	匡华，张铭，赵岩岩，严子清，杨黎,
作者单位	1. 湖北省地质调查院, 湖北武汉 430034; 2. 中国地质大学(武汉)资源学院, 湖北武汉 430074
摘要	石头咀Cu-Fe矿床是鄂东南地区典型的矽卡岩型矿床,目前其成矿时代不明,成矿流体演化过程尚不清楚。本文根据野外调研和岩相学观察,识别出该矿床发育3个世代的石榴子石,并利用原位EMPA、LA-ICP-MS微量和U-Pb定年分析技术对石榴子石开展了系统的研究。结果表明,Grt1(Adr_61~68Grs_28~36)成分变化小,不发育环带,由扩散交代作用形成;Grt2(Adr_63~89Grs_7~33)成分变化较大,发育震荡环带结构,由渗透交代作用形成;Grt3成分均一,环带发育,为残余流体结晶的产物。Y/Ho值(19.24~32.13,均值26.46)表明石头咀矿床的石榴子石具有相同的岩浆流体来源,相对富集LREE和亏损HREE的稀土元素配分模式反映了3个世代的石榴子石均形成于弱酸性的流体环境。δEu异常、Sn和REE含量等特征指示了在Grt1、Grt2到Grt3的形成过程中,成矿流体发生了从相对还原到氧化的转变,水岩反应强度具有先增加后降低的特点。石榴子石(Grt2)LA-ICP-MS U-Pb定年结果为138±1 Ma,准确限定了石头咀矿床的成矿时代,证实了石头咀矿床的形成与铜绿山岩体具有密切的成因联系。石头咀矿床的成矿作用为燕山早期岩浆活动在鄂东南地区的矿化响应。
Abstract	The Shitouzui Cu-Fe deposit is one of the typical skarn deposits in the southeastern Hubei Province. Currently, its mineralization age and the evolution process of ore-forming fluids are not clear yet. Based on the field research and petrographic observation, three generations of garnets were identified in this deposit, and in situ EMPA, LA-ICP-MS trace element and U-Pb dating of garnets were conducted for a systematic study. The results indicate that Grt1 (Adr_61~68Grs_28~36) has small compositional variation, and formed by diffusion metasomatism; Grt2 (Adr_63~89Grs_7~33) with oscillatory zoning exhibits significant compositional variation and formed by infiltration metasomatism; the composition of Grt3 (Adr_82~89Grs_5~11) is uniform and it resulted from crystallization of residual fluid. Y/Ho values (19.24~32.13, averaging at 26.46) suggest that the garnets in the Shitouzui deposit have the same magmatic fluid source. Relatively LREE-enriched and HREE-depleted patterns reflect that all these garnets precipitated in weakly acidic fluid condition. The characteristics of δEu, Sn and REE concentration indicate that the ore-forming fluid changed from relative reduced to oxidized condition, the intensity of water/rock reaction showed an increase to decrease feature, respectively, during the formation from Grt1, Grt2 to Grt3. The LA-ICP-MS U-Pb dating result of Grt2, 138 ±1 Ma, accurately constrains the Cu-Fe mineralization age of the Shitouzui deposit and further confirms the close genetic relationship between the mineralization and the Tonglüshan quartz diorite. The mineralization of the Shitouzui Cu-Fe deposit is a response to the early Yanshanian magmatic activity in southeastern Hubei Province.
关键词	鄂东南；石头咀；石榴子石；成矿时代；流体演化
KeyWord	southeastern Hubei Province; Shitouzui; garnet; mineralization age; ore-forming fluid evolution
基金项目
页码	535-555

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匡华，张铭，赵岩岩，严子清，杨黎. 鄂东南石头咀矽卡岩型Cu-Fe矿床石榴子石原位成分、U-Pb测年及其地质意义 [J]. 岩石矿物学杂志. 2025; 44; (3). 535 - 555.

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