小秦岭华阳川铀多金属矿床新生代隆升剥露的裂变径迹证据
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1.东华理工大学,地球科学学院;2.东华理工大学地球科学学院;3.中陕核工业集团二二四大队有限公司;4.东华理工大学,核资源与环境国家重点实验室

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国家自然基金项目(42262017,41902075,42172098),江西省自然科学基金项目(20212BAB213009),江西省教育厅科技计划项目(GJJ200767)和中国铀业有限公司-东华理工大学联合创新基金项目(2023NRE-LH-12、NRE2021-01、NRE2021-01)


Fission track evidence of Cenozoic uplift and exhumation of Huayangchuan uranium polymetallic deposit in Xiaoqinling
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1.College of Earth Sciences, East China University of Technology;2.Geological Party No.224 Sino Shaanxi Nuclear Industry Group;3.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology

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    摘要:

    华阳川铀多金属矿床是一个以铀铌铅为主并伴生稀土元素的综合性超大型矿床。为理清该矿床的剥露历史和矿体保存情况,本文依据矿体展布特征在华阳川矿区系统采集10个片麻岩样品,进行磷灰石裂变径迹测试。径迹结果显示样品的径迹年龄介于52.0±2.9 ~ 35.2±0.77 Ma,平均径迹长度为11.53~13.73μm之间。热史模拟显示,华阳川地区新生代以来主要经历了①始新世(54~34 Ma)和③中中新世至今(13~0 Ma)2期快速隆升剥露以及②渐新世至中中新世(34~13 Ma)缓慢剥蚀过程。结合区域构造演化,构建了华阳川地区新生代构造演化模式,认为该地区始新世时期的快速隆升剥蚀是受小河断裂自南向北逆冲推覆以及华山山前断裂伸展活动共同影响;34~13Ma期间研究区整体处于构造寂静期;13Ma以来快速隆升剥露主要受华山山前断裂影响,导致研究区发生北仰南倾的掀斜。裂变径迹数据和热史模拟表明研究区南东侧矿体保存状况良好,找矿潜力较大。

    Abstract:

    The Huayangchuan uranium polymetallic deposit is a comprehensive super-large deposit dominated by U-Nb-Pb and associated with rare earth elements. In order to clarify the exhumation history of the deposit and the preservation of the ore body, this paper systematically collected 10 gneiss samples in Huayangchuan mining area according to the distribution characteristics of the ore body, and carried out apatite fission track test. The results show that the age of the samples is between 52.0 ± 2.9 ~ 35.2 ± 0.77 Ma, and the average track length is between 11.53~13.73μm. The thermal history simulation shows that the Huayangchuan area has experienced two stages of rapid uplift and denudation since the Cenozoic : ① Eocene ( 54 ~ 34 Ma ) and ③ Middle Miocene to present ( 13 ~ 0 Ma ), and ②Oligocene to Middle Miocene ( 34 ~ 13 Ma ). Combined with the regional tectonic evolution, the Cenozoic tectonic evolution model of Huayangchuan area is constructed. It is considered that the rapid uplift and denudation in the Eocene period is affected by the thrusting of Xiaohe fault from south to north and the extension of Huashan piedmont fault. During the period of 34 ~ 13 Ma, the study area was in the tectonic quiet period as a whole. The rapid uplift and exhumation since 13 Ma was mainly affected by the Huashan piedmont fault, resulting in the tilt of the study area from north to south. Fission track data and thermal history simulation show that the ore bodies on the southeast side of the study area are well preserved and have great prospecting potential.

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  • 收稿日期:2023-10-13
  • 最后修改日期:2023-12-07
  • 录用日期:2023-12-08
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