ZIRCON GEOCHRONOLOGY FOR SEDIMENTARY ROCKS OF NANXIONG GROUP IN CHANGTIAN AREA, NORTHEAST GUANGDONG: Geological Implication
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摘要:
粤东北长田盆地是广东省重要的能源盆地之一. 为详细了解该区地质结构、沉积物质特征、示踪砂岩物源等信息，在野外地质调查基础上，利用显微鉴定、电子探针分析（EPMA）和激光剥蚀电感耦合等离子体质谱仪（LA-ICP-MS）等方法，对长田盆地南雄群典型砂岩开展系统研究. 结果表明：研究区白垩系上统南雄群上亚群主要为（含炭质）岩屑石英砂岩，其次为钙质砂岩、（泥质）粉砂岩、细砂岩、砾岩及杂砂岩，普遍发育明显的次生变化和金属矿化现象. 南雄群碎屑锆石研究显示，样品中大部分碎屑锆石具有较好的振荡环带且Th/U值常大于0.4，指示锆石主要为岩浆结晶成因，有少量复杂成因变质锆石. U-Pb谐和年龄可大致分为2506~1666 Ma、1815~941 Ma、510~434 Ma、308~234 Ma、172~99 Ma五组，可与粤东北已知大地构造运动事件相对应，表明研究区的构造-岩浆活动主要受中国东部岩浆构造活动控制，并具有阶段性幕式发展演化的特点. 通过对南雄群碎屑岩岩相学、锆石U-Pb年龄、稀土元素特征的系统分析，并与可能物源区进行对比研究，认为南雄群碎屑物质主要来自长田盆地西缘的中生代岩浆岩侵入体.
Abstract:Changtian Basin is one of significant energy basins in Guangdong Province. To learn the geological structure, sedimentary material characteristics and tracer sandstone provenance in detail, microscopic identification, electron probe microanalysis(EPMA)and laser ablation inductively coupled plasma mass spectrometer(LA-ICP-MS)are used to systematically study the typical sandstones of Nanxiong Group in Changtian Basin on the basis of field geological survey. The results show that the Upper Cretaceous Nanxiong Upper Subgroup is mainly composed of(carbonaceous)lithic quartz sandstone, followed by calcareous sandstone, (argillaceous)siltstone, fine sandstone, conglomerate and greywacke, generally developed with obvious secondary changes and metallization. The analysis of detrital zircons from Nanxiong Group reveals that most of the zircons in the samples have perfect oscillatory bands with Th/U values usually greater than 0.4, indicating the zircons are mainly of magmatic crystallization origin, with a few metamorphic zircons of complex origin. The U-Pb concordant ages can be roughly divided into five groups: 2506-1666 Ma, 1815-941 Ma, 510-434 Ma, 308-234 Ma, and 172-99 Ma, which correspond to the known tectonic events in northeast Guangdong, reflecting that the tectono-magmatic activities in the study area are mainly controlled by the magmatic activities in eastern China, with the characteristics of episodic development and evolution. Based on the systematic analysis of lithography, zircon U-Pb age and REE characteristics of clastic rocks from Nanxiong Group, and comparison with the possible provenance, it is concluded that the detrital materials were mainly derived from Mesozoic magmatic intrusions in the western margin of Changtian Basin.
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Key words:
- Nanxiong Group /
- Cretaceous /
- LA-ICP-MS /
- detrital zircon /
- source of sedimentary material /
- geochronology /
- Guangdong Prorince
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[1] 余端珍. 粤东北仁差盆地北部某矿床地质特征及矿床成因分析[J]. 四川建材, 2012, 38(6): 243-245.
Yu D Z. The geological characteristics and genetic analyses of a deposit in northern Renchai Basin, northeast Guangdong Province[J]. Sichuan Building Materials, 2012, 38(6): 243-245. (in Chinese)
[2] 鲁晶. 粤东北河源地区构造演化与成矿关系讨论[J]. 世界有色金属, 2018(8): 152-154. https://www.cnki.com.cn/Article/CJFDTOTAL-COLO201808086.htm
Lu J. Tectonic evolution and mineralization of Heyuan area, Guangdong Province[J]. World Nonferrous Metals, 2018(8): 152-154. https://www.cnki.com.cn/Article/CJFDTOTAL-COLO201808086.htm
[3] 吴承健, 吴延之. 闽西南-粤东北地区大地构造演化与铜、(伴生)银的成矿作用[J]. 大地构造与成矿学, 1994, 1(4): 345-352. https://www.cnki.com.cn/Article/CJFDTOTAL-DGYK404.008.htm
Wu C J, Wu Y Z. Geotectonic evolution and Cu-(associated)Ag metallogenesis in Southwest Fujian and Northeast Guangdong[J]. Geotectonica et Metallogenia, 1994, 1(4): 345-352. https://www.cnki.com.cn/Article/CJFDTOTAL-DGYK404.008.htm
[4] 徐先兵, 张岳桥, 贾东, 等. 锆石LA-ICP-MS U-Pb与白云母40Ar/39Ar年代学及其对中国东南部早燕山事件的制约[J]. 地质科技情报, 2010, 29(2): 87-94. doi: 10.3969/j.issn.1000-7849.2010.02.016
Xu X B, Zhang Y Q, Jia D, et al. Geochronology of zircon La-ICP-MS U-Pb and muscovite 40Ar/39Ar: Constrains to Early Yanshanian event in Southeast China[J]. Geological Science and Technology Information, 2010, 29(2): 87-94. doi: 10.3969/j.issn.1000-7849.2010.02.016
[5] 张善果, 阮昆. 粤东北柏埔地区燕山期小岩体地球化学特征与铀成矿探讨[J]. 世界核地质科学, 2019, 36(2): 73-81. doi: 10.3969/j.issn.1672-0636.2019.02.002
Zhang S G, Ruan K. Geochemical characteristics and uranium mineralization of Yanshanian small pluton in Bopu area of northeastern Guangdong[J]. World Nuclear Geoscience, 2019, 36(2): 73-81. doi: 10.3969/j.issn.1672-0636.2019.02.002
[6] 唐湘生, 聂斌, 李嘉. 武夷山成矿带铀成矿特征与找矿方向[J]. 铀矿地质, 2011, 27(2): 69-73. doi: 10.3969/j.issn.1000-0658.2011.02.002
Tang X S, Nie B, Li J. Uranium metallogenic characteristics and exploration direction of Wuyishan metallogenic belt[J]. Uranium Geology, 2011, 27(2): 69-73. doi: 10.3969/j.issn.1000-0658.2011.02.002
[7] 杨华, 杨仁广. 河源盆地××铀矿床成矿条件分析[J]. 四川建材, 2011, 37(4): 95-96. doi: 10.3969/j.issn.1672-4011.2011.04.047
Yang H, Yang R G. Analysis of metallogenic conditions of XX uranium deposit in Heyuan Basin[J]. Sichuan Building Materials, 2011, 37 (4): 95-96. (in Chinese) doi: 10.3969/j.issn.1672-4011.2011.04.047
[8] 陈祝海, 郑明良, 宋仕珠, 等. 广东河源成矿带铀资源现状及成矿潜力分析[J]. 铀矿地质, 2008, 24(2): 108-111. doi: 10.3969/j.issn.1000-0658.2008.02.008
Chen Z H, Zheng M L, Song S Z, et al. Analysis on uranium resources situations and metallogenic potential of Heyuan mineralization belt of Guangdong Province[J]. Uranium Geology, 2008, 24(2): 108-111. doi: 10.3969/j.issn.1000-0658.2008.02.008
[9] 林卜云. 广东河源地区放射场特征初探[J]. 铀矿地质, 1996, 12 (1): 37-40. https://www.cnki.com.cn/Article/CJFDTOTAL-YKDZ601.005.htm
Lin B Y. Preliminary discussion on the characteristics of radioactive fields in the Heyuan Area of Guangdong Province[J]. Uranium Geology, 1996, 12(1): 37-40. https://www.cnki.com.cn/Article/CJFDTOTAL-YKDZ601.005.htm
[10] 吴建勇, 阮昆, 龙自强, 等. 粤东罗浮岩体北部铀成矿条件分析[J]. 铀矿地质, 2020, 36(3): 167-173. doi: 10.3969/j.issn.1000-0658.2020.03.003
Wu J Y, Ruan K, Long Z Q, et al. Analysis on metallogenic conditions of northern Luofu pluton in the east of Guangdong[J]. Uranium Geology, 2020, 36(3): 167-173. doi: 10.3969/j.issn.1000-0658.2020.03.003
[11] 汤谨晖. 粤东北仁差盆地铀多金属矿成矿地质特征与成矿预测[D]. 南昌: 东华理工大学, 2020.
Tang J H. Metallogenic geological characteristics and metallogenic prediction of uranium and polymetallic ore in Renchai Basin of Northeast Guangdong[D]. Nanchang: East China University of Technology, 2020.
[12] 宋仕珠, 赵巍, 郑明良, 等. 粤东北仁差盆地麻楼逆冲推覆构造特征与铀成矿作用[J]. 铀矿地质, 2010, 26(5): 283-287, 312. doi: 10.3969/j.issn.1000-0658.2010.05.005
Song S Z, Zhao W, Zheng M L, et al. Features and uranium mineralization of Malou thrust nappe structure in Renchai Basin of Northeast Guangdong[J]. Uranium Geology, 2010, 26(5): 283-287, 312. doi: 10.3969/j.issn.1000-0658.2010.05.005
[13] 娄峰, 于玉帅, 郑义, 等. 粤东北仁差盆地构造演化与铀成矿构造机制探讨[J]. 中山大学学报(自然科学版), 2017, 56(4): 145-153. https://www.cnki.com.cn/Article/CJFDTOTAL-ZSDZ201704021.htm
Lou F, Yu Y S, Zheng Y, et al. Tectonic evolution and mechanism of uranium mineralization structure in the Renchai Basin, northeastern Guangdong[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2017, 56(4): 145-153. https://www.cnki.com.cn/Article/CJFDTOTAL-ZSDZ201704021.htm
[14] 黄卉, 潘家永, 洪斌跃, 等. 陕西华阳川铀-多金属矿床晶质铀矿电子探针U-Th-Pb化学定年及其地质意义[J]. 矿床地质, 2020, 39 (2): 351-368. https://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ202002009.htm
Huang H, Pan J Y, Hong B Y, et al. EPMA chemical U-Th-Pb dating of uraninite in Huayangchuan U-polymetallic deposit of Shaanxi Province and its geological significance[J]. Mineral Deposits, 2020, 39(2): 351-368. https://www.cnki.com.cn/Article/CJFDTOTAL-KCDZ202002009.htm
[15] 叶丽娜, 孙丰月, 王力, 等. 吉东大栗子铁矿区石英二长斑岩U-Pb年龄、地球化学及Hf同位素组成[J]. 地球科学, 2020, 45 (5): 1544-1555. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202005006.htm
Ye L N, Sun F Y, Wang L, et al. Zircon U-Pb geochronology, geochemistry and Hf isotopic composition of the quartz monzonite porphyry intrusion from east Jilin Province[J]. Earth Science, 2020, 45(5): 1544-1555. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX202005006.htm
[16] 兰中伍, 陈岳龙, 苏本勋, 等. 四川松潘-甘孜盆地砂岩的物质来源: 来自锆石U-Pb(SHRIMP)年龄证据[J]. 沉积学报, 2006, 24(3): 321-332. doi: 10.3969/j.issn.1000-0550.2006.03.002
Lan Z W, Chen Y L, Su B X, et al. The origin of sandstones from the Songpan-Ganze Basin, Sichuan, China: Evidence from SHRIMP U-Pb dating of clastic zircons[J]. Acta Sedimentologica Sinica, 2006, 24(3): 321-332. doi: 10.3969/j.issn.1000-0550.2006.03.002
[17] Gehrels G E, Johnsson M J, Howell D G. Detrital zircon geochronology of the Adams argillite and Nation River Formation, East-Central Alaska, U.S.A. [J]. Journal of Sedimentary Research, 1999, 69(1): 135-144. doi: 10.2110/jsr.69.135
[18] 雷开宇. 鄂尔多斯盆地杭锦旗地区直罗组碎屑锆石稀土元素特征及地质意义[J]. 延安大学学报(自然科学版), 2015, 34(4): 58-62. https://www.cnki.com.cn/Article/CJFDTOTAL-YSZR201504016.htm
Lei K Y. Rare earth elements of detrital zircon characteristics and geological significance of zhiluo formation in Hangjinqi Area, Ordos Basin[J]. Journal of Yanan University(Natural Science Edition), 2015, 34(4): 58-62. https://www.cnki.com.cn/Article/CJFDTOTAL-YSZR201504016.htm
[19] Ludwig K R. User's manual for Isoplot/Ex. Version 3.00: A geochronological toolkit for Microsoft Excel[J]. Berkeley Geochronology Center Special Publication, 2003, 4(2): 1-70.
[20] Belousova E A, Griffin W L, O'Reilly S Y, et al. Igneous zircon: Trace element composition as an indicator of source rock type[J]. Contributions to Mineralogy and Petrology, 2002, 143(5): 602-622. doi: 10.1007/s00410-002-0364-7
[21] 雷玮琰, 施光海, 刘迎新. 不同成因锆石的微量元素特征研究进展[J]. 地学前缘, 2013, 20(4): 173-284. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201304028.htm
Lei W Y, Shi G H, Liu Y X. Research progress on trace element characteristics of zircons of different origins[J]. Earth Science Frontier, 2013, 20(4): 173-284. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY201304028.htm
[22] Mao J R, Li Z L, Ye H M. Mesozoic tectono-magmatic activities in south China: Retrospect and prospect[J]. Science China: Earth Sciences, 2014, 57(12): 2853-2877.
[23] 肖振宇. 粤东北嵩溪银锑矿床地质地球化学及成矿模式[D]. 合肥: 合肥工业大学, 2001.
Xiao Z Y. Geology, Geochemistry and metallogenic model of Songxi silver-antimony deposit in northeast Guangdong[D]. Hefei: Hefei University of Technology, 2001. (in Chinese)
[24] 夏菲, 陈军胜, 王晓娜, 等. 广东平远县278铀矿床流纹岩、次流纹斑岩和辉绿岩LA-ICP-MS锆石U-Pb定年及其地质意义[J]. 地质与勘探, 2017, 53(1): 109-123. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKT201701012.htm
Xia F, Chen J S, Wang X N, et al. LA-ICP-MS Zircon U-Pb dating on rhyolites, supergene rhyolite porphyry and diabase of No. 278 uranium deposit in Pingyuan County, Guangdong and its geological implications[J]. Geology and Exploration, 2017, 53(1): 109-123. https://www.cnki.com.cn/Article/CJFDTOTAL-DZKT201701012.htm
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