| 江西相山铀矿田地貌剥蚀特征及其控矿意义——磷灰石裂变径迹证据 |
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| 引用本文： | 陈正乐,韩凤彬,杨农,王平安,宫红良,邵飞,唐湘生,徐金山,周永贵,王永.江西相山铀矿田地貌剥蚀特征及其控矿意义——磷灰石裂变径迹证据[J].地球物理学报,2012,55(7):2371-2384. |
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| 作者姓名： | 陈正乐 韩凤彬 杨农 王平安 宫红良 邵飞 唐湘生 徐金山 周永贵 王永 |
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| 作者单位： | 1. 中国地质科学院地质力学研究所, 北京 100081;2. 北京建龙国基投资有限公司, 北京 100060;3. 核工业270研究所, 江西南昌县 330200 |
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| 基金项目： | 国家重点基础研究发展计划，全国危机矿山接替资源找矿项目，国家自然科学基金项目 |
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| 摘 要： | 本文以数字高程(DEM)地貌特征分析为基础,采用磷灰石裂变径迹测试和温度-时间反演模拟研究,分析江西相山铀矿田铀成矿后剥蚀程度的差异性,结合已知矿床的成矿特征,探讨地貌剥蚀程度与矿体保存之间的关系,为区域找矿提供指导.通过DEM合成图像和水系分布特征,表明相山铀矿田是一个遭受中等侵蚀的地貌区,相山主峰南北和东西侧地貌侵蚀差异特征明显.统计分析表明,已经发现的铀矿床、点的分布与次级火山机构关系密切,相山南部的次火山机构剥蚀较深,西部次火山机构剥蚀相对弱,而北部和西北部则处于中等剥蚀程度.磷灰石裂变径迹测试结果表明,相山铀矿田的南部和东部开始剥蚀的时间早于西部,但晚于相山主峰的剥蚀.利用磷灰石的裂变径迹长度和温度参数,进一步开展了温度-时间的反演模拟研究,结果显示相山西部快速隆升发生于40~60 Ma之间,相山南部和东部的快速隆升发生于60~75 Ma之间,相山主峰的快速隆升发生于75~100 Ma之间,表明相山主峰、相山东部及南部较西部经历了较长时间的剥蚀.结合现今区域地质体出露特征及铀矿化蚀变类型的空间展布规律、成矿深度的估算等,推测相山铀矿田东部和南部剥蚀程度较深,早期可能形成的中低温铀矿体被剥蚀殆尽;北部剥蚀程度中等,地表出露了形成深度稍深的碱交代蚀变矿床;而西部剥蚀程度较低,地表发育浅部低温成矿的酸交代蚀变铀矿床.据此推断,相山铀矿田的西部深部具有很好的找矿潜力.
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| 关 键 词： | 相山铀矿 地貌剥蚀 矿产保存 磷灰石裂变径迹 |
| 收稿时间： | 2011-03-18 |
Topographic erosive diversities of the Xiangshan uranium ore-field, Jiangxi province and its implications for ore-preservation: evidences from fission track dating of apatite |
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| CHEN Zheng-Le
,
HAN Feng-Bin
,
YANG Nong
,
WANG Ping-An
,
GONG Hong-Liang
,
SHAO Fei
,
TANG Xiang-Sheng
,
XU Jin-Shan
,
ZHOU Yong-Gui
,
WANG Yong.Topographic erosive diversities of the Xiangshan uranium ore-field, Jiangxi province and its implications for ore-preservation: evidences from fission track dating of apatite[J].Chinese Journal of Geophysics,2012,55(7):2371-2384. |
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| Authors: | CHEN Zheng-Le HAN Feng-Bin YANG Nong WANG Ping-An GONG Hong-Liang SHAO Fei TANG Xiang-Sheng XU Jin-Shan ZHOU Yong-Gui WANG Yong |
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| Institution: | 1. Institute of Geomechinacs, Chinese Academy of Geological Sciences, 100081 Beijing, China;2. Beijing Jianlong Investment Company, Beijing 100060, China;3. Research Institute No.270, CNNC, Nanchang, Jiangxi 330200, China |
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| Abstract: | This paper mainly presents analyses results of fission track dating of apatite and Digital Elevation Modeling(DEM) of the Xiangshan landscape,to discuss the relationship of the topographic erosion after uranium mineralization with the ore-preservation.DEM synthetic image and runoff system distribution suggested that the Xiangshan ore-field was a kind of medium erosive landform,with apparently erosive diversities in south-north and east-west side of the Xiangshan main peak.The distribution of uranium deposits was highly related to sub-volcanic apparatus,with most sub-volcanic apparatus heavy eroded in southern ore-field,weakly eroded in western,and medium eroded in northern and northwestern.Apatite in volcanic rocks both from the peak of Xiangshan mountain and around the Xiangshan ore-field was chosen out and applied to fission track dating.It was yielded that rocks from southern and northern ore-field were earlier exposed at the surface than those from western areas,but later than those from the peak of Xiangshan mountain.Temperature-time modeling by the length and age of the fission track of apatite showed that the rapid exhumation of western Xiangshan areas took placed during 60~40Ma,in southern and eastern parts during 75~60 Ma,and in the peak of Xiangshan Mountain during 100~75 Ma,indicating that the peak and southern and eastern Xiangshan ore-fields had experienced much longer time erosion than western ore-fields.Our results are fairly consistent with the nowadays regional exposed characteristics of volcanic rocks,with distribution patterns of mineralization-related alternation,and with the temperature and depth of uranium mineralization,suggesting that southern and eastern parts of the Xiangshan ore-field should be relatively heavy eroded,leading to the depletion of those medium-epithermal ore-bodies probably earlier formed.Northern and northwestern parts be moderately eroded,leading alkaline-altered-related uranium ore-bodies relatively deeply formed under relative high temperature exposed at the surface.While with weak erosion in western,most uranium ore-bodies probably still preserved and acid-alteration-related uranium ore-bodies under lower temperature exposed at the surface.As a result,it was proposed that western deep areas were of favorable for further ore-prospecting. |
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| Keywords: | Xiangshan uranium ore-field Topographic erosive diversities Ore-preservation Fission track dating of apatite |
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