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| 桂北龙胜上朗变镁铁质岩锆石UPb年龄及其地质意义 | |
| 引用本文： | 秦亚,冯佐海,万磊,吴疆,吴杰,邢全力,薛云峰.桂北龙胜上朗变镁铁质岩锆石UPb年龄及其地质意义[J].吉林大学学报(地球科学版),2022,52(1):109-133. |
| 作者姓名： | 秦亚 冯佐海 万磊 吴疆 吴杰 邢全力 薛云峰 |
| 作者单位： | 1.广西有色隐伏金属矿产勘查与新材料开发协同创新中心/桂林理工大学广西隐伏金属矿产勘查重点实验室，广西桂林5410042.湖南宏禹工程集团有限公司，长沙410011 |
| 基金项目： | 广西自然科学基金;国家自然科学基金 |
| 摘 要： | 本文采用LAICPMS锆石UPb测年对桂北龙胜地区上朗变镁铁质岩进行年代学研究。2件年代学样品给出近乎一致的年龄信息，集中在(114.8±1.6)、(152.0±5.0)、(213.9±3.5)、(274.6±9.4)、(442.5±6.7)、(553.5±9.2)、(774.2±5.9)和(822.0±10.0) Ma等8个年龄峰值。锆石成因类型研究表明，(774.2±5.9) Ma锆石为样品中最年轻的岩浆锆石，代表上朗变镁铁质岩的侵位时代。UPb年龄大于(822.0±10.0) Ma的锆石为捕获锆石，代表岩浆侵位过程中捕获物质的时代。(114.8±1.6)、(152.0±5.0)、(213.9±3.5)、(274.6±9.4)、(442.5±6.7)和(553.5±9.2) Ma为热液锆石年龄，代表变镁铁质岩成岩后遭受后期构造热事件影响的时限。其中，(442.5±6.7) Ma代表寿城—三门断裂韧性变形的时代，与区域NNE向韧性断裂的变形时代一致。而小于(442.5±6.7) Ma的热液锆石年龄，表明岩石韧性变形后遭受多期构造热事件的影响。泛非期(553.5±9.2) Ma热液锆石的存在，表明华南大陆曾受泛非构造热事件的影响，应具有冈瓦纳大陆的亲缘性。 |
| 关 键 词： | 变镁铁质岩 热液锆石 UPb年龄 变形时代 泛非构造热事件 桂北地区 |
| 收稿时间： | 2020-11-04 |
LA-ICP-MS Zircon U-Pb Age of Shanglang Metamafic Rocks in Longsheng,Northern Guangxi and Its Geological Significance |
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| Qin Ya,Feng Zuohai,Wan Lei,Wu Jiang,Wu Jie,Xing Quanli,Xue Yunfeng.LA-ICP-MS Zircon U-Pb Age of Shanglang Metamafic Rocks in Longsheng,Northern Guangxi and Its Geological Significance[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(1):109-133. | |
| Authors: | Qin Ya Feng Zuohai Wan Lei Wu Jiang Wu Jie Xing Quanli Xue Yunfeng |
| Institution: | 1. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi/Guangxi Key Laboratory of Hidden Metallic Ore Exploration, Guilin University of Technology, Guilin 541004, Guangxi, China 2. Hunan Hongyu Engineering Group Co., Ltd., Changsha 410011, China |
| Abstract: | The chronology of Shanglang metamafic rocks in Longsheng area of northern Guangxi was researched by LAICPMS zircon UPb dating. The age information of two chronological samples are nearly consistent, concentrated in eight intervals (114.8±1.6), (152.0±5.0), (213.9±3.5), (274.6±9.4), (442.5±6.7), (553.5±9.2), (774.2±5.9), and (822.0±10.0) Ma. The genetic types of zircons show that the zircon of (774.2±5.9) Ma is the youngest magmatic zircon, representing the emplacement age of Shanglang metamafic rocks. The zircon of (822.0±10.0) Ma is the captured zircon, representing the age of the captured materials during the magma emplacement. The hydrothermal zircon ages are (114.8±1.6), (152.0±5.0), (213.9±3.5), (274.6±9.4), (442.5±6.7), and (553.5±9.2) Ma, representing the time limits of the later tectonic thermal events of metamafic rocks. Among the hydrothermal zircon ages, (442.5±6.7) Ma represents the ductile deformation age of ShouchengSanmen fault, which is consistent with the ductile deformation age of regional NNE faults, and the hydrothermal zircon age of less than (442.5±6.7) Ma is the tectonic thermal events after ductile deformation. The existence of (553.5±9.2) Ma Pan African hydrothermal zircon indicates that the South China continent was influenced by Pan African tectonic thermal events and should be related to Gondwana continent. |
| Keywords: | metamafic rocks hydrothermal zircon U-Pb age deformation era Pan-African tectonic thermal event northern Guangxi |
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