投稿时间：2025-01-14
修订日期：2025-09-09
网络发布日期：2025-10-31
中文摘要:钛为中国的战略性矿产资源，苏鲁造山带毛北地区是重要的钛资源找矿区带。文章以毛北矿区中-北矿段及其附近的南榴、彭宅和青龙山榴辉岩体为研究对象，对其中的金红石进行了LA-ICP-MS U-Pb年龄及微量元素分析。毛北矿区中-北矿段2件榴辉岩中金红石的206Pb/238U的加权平均年龄为(202.5±3.6)Ma、(200.8±1.5)Ma，南榴、彭宅和青龙山榴辉岩中金红石的206Pb/238U的加权平均年龄分别为(201.8±1.4)Ma、(201.9±1.8)Ma和(197.7±4.1)Ma。结合区域构造演化历史，推断毛北金红石矿形成于折返晚期的退变质阶段。利用Zr温度计得到低于超高压变质峰期的温度（634~708℃），进一步印证了金红石形成于退变质作用后。附近的南榴、彭宅和青龙山榴辉岩体与毛北矿区榴辉岩体中的金红石年龄、微量元素具有相似特征，推测有较大的成矿潜力，并建议在找矿勘探和开采过程中加强多矿种的综合利用。<
Abstract:Titanium is a strategic mineral resource in China, and rutile is a high-quality raw material for titanium. Jiangsu Province ranks second in China for rutile reserves and is an important area for titanium resource exploration. However, the previous understanding of the mineralization era and the mechanisms of mineral formation is unclear. This study selected two eclogite samples from the middle-north section of the Maobei mining area in Donghai County, as well as nearby eclogite bodies from Nanliu, Pengzhai, and Qinglongshan, to conduct LA-ICP-MS U-Pb dating and trace element analysis of the rutile contained within. The weighted average ages of rutile in the two eclogite samples from the Maobei mining area are (202.5±3.6)Ma and (200.8±1.5)Ma, respectively. For the rutile from the Nanliu, Pengzhai, and Qinglongshan eclogites, the weighted average ages are (201.8±1.4)Ma, (201.9±1.8)Ma and (197.7±4.1)Ma. In conjunction with the regional tectonic evolution history, these ages can represent the retrograde metamorphic stage after the metamorphic peak, representing the tectonic folding after the Triassic ultra-high-pressure metamorphic peak. The trace elements of rutile in the five eclogite samples show similar characteristics, with significantly higher high field strength element contents than the primitive mantle, indicating that ultra-high-pressure metamorphism is a key link in titanium enrichment. Using the Zr thermometer, temperatures below the ultra-high-pressure metamorphic peak (634~708℃) were obtained, further confirming that rutile formed under temperature conditions after the retrograde metamorphic action. The nearby Nanliu, Pengzhai, and Qinglongshan eclogite bodies have similar characteristics in rutile age and trace elements to those in the middle-north section of the Maobei mining area, suggesting a significant potential for mineralization. It is recommended to strengthen the comprehensive utilization of multiple ores in the process of exploration and mining.
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基金项目:本文为江苏省高职院校智能建造3D技术应用工程技术研究开发中心和江苏城乡建设职业学院智能建造科研平台的成果，得到江苏省高等学校基础科学（自然科学）研究面上项目“江苏省东海毛北金红石矿流体成矿过程和成矿机制研究”（编号：22KJD170001）、国家自然科学基金面上项目“富CO2斑岩钼矿成矿过程和成矿机制的精确厘定：以沙坪沟为例”（编号：4217072）和中国地质调查局地质调查项目“江西崇义-宁都地区战略性矿产调查”（编号：DD20242516）联合资助
引用文本：
李利,王国光,李海立,武现伟,张鑫,张瑞.2025.大别-苏鲁造山带毛北地区金红石LA-ICP-MS U-Pb定年及其地质意义[J].矿床地质,44(5):983~1000LI Li,WANG GuoGuang,LI HaiLi,WU XianWei,ZHANG Xin,ZHANG Rui.2025.LA-ICP-MS U-Pb dating of rutile in Maobei area of Dabie-Sulu orogenic belt and its geological significance[J].Mineral Deposits44(5):983~1000
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