Application of Uranium Disequilibrium in the Study of the Weathering Rate of the Granite in Northern Guangdong
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摘要: 为探讨粤北花岗岩化学风化过程中所表征的地貌演化和气候环境变化，选取锦江流域为研究区，运用铀系不平衡方法，测试流域内河流水中铀的质量浓度、风化壳及岩石中铀的质量分数、234U与238U的放射性活度比，计算流域中花岗岩的化学风化速率.结果显示：在当前水热条件下，本流域中平均CIA值为86.84的花岗岩风化壳的化学风化速率为0.038 mm/a，即风化1 m厚的花岗岩需要约26 000年；在热带亚热带地区，控制岩石风化的主要因素是高温潮湿的气候条件；铀系同位素之间产生的不平衡适用于量化评估风化作用下水-土-岩三者间的相互作用，也为岩石风化及地表过程的相关研究提供了一种新的示踪手段.Abstract: In order to explore the geomorphological evolution and climatic environment changes in the chemical weathering process of the granites in northern Guangdong, Jinjiang River Basin is selected as the research area and the uranium-series isotopes disequilibrium method is used to measure the uranium concentration and 234U/238U activity ratios of river water, weathering crust and rock in the basin and calculate of chemical weathering rate of grani-te in the basin. As the results show, under the current climatic conditions, the chemical weathering rate of the grani-te weathering crust with the CIA of 86.84 is 0.038 mm/year, which means that it will take about 26 000 years for 1 m thick granite to weather; in the tropical and subtropical regions, and the main factor for rock weathering is the climate conditions with high temperature and humidity. Uranium isotopes disequilibrium can be used to quantitatively evaluate the interaction among water, soil and rock under weathering, and it also provides a new means for research on rock weathering and earth surface processes.
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Key words:
- rock weathering rate /
- uranium disequilibrium /
- degree of weathering
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图 1 锦江流域位置和采样点图
Figure 1. The map of the Jinjiang River Basin location and sampling sites
表 1 锦江流域岩石中238U的质量分数和234U与238U的放射性活度比
Table 1. The Uranium concentration and 234U/238U activity ratio in rocks of the Jingjiang River Basin
样品号 主要矿物组成 岩性 w(238U)/(μg·g-1) A(234U)/A(238U) CJ-Y1 钾长石，钠长石，角闪石，黑云母，石英 花岗岩 48.5 1.03±0.03 BSWXX-Y 钠长石，角闪石，石英，黑云母 花岗岩 22.3 1.01±0.05 
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表 2 锦江流域风化壳中238U的质量分数和234U与238U的放射性活度比
Table 2. The Uranium concentration and 234U/238U activity ratio in weathering crust of the Jinjiang River Basin
样品号 层级 深度/m w(238U)/(μg·g-1) A(234U)/A(238U) CJ-02 B 1.0 10.80 0.83±0.04 CJ-03 B 1.5 7.20 0.96±0.03 CJ-05 C 2.5 10.00 1.09±0.05 BSWXX-03 B 2.0 12.60 0.96±0.05 BSWXX-04 B 2.5 6.95 0.99±0.05 MW-01 B 1.5 16.30 0.99±0.03 MW-03 C 13.5 13.30 0.94±0.03 LTZ-L B 4.5 4.16 1.01±0.05 LTZ-R B 5.0 3.91 1.00±0.04
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表 3 锦江流域河流水中238U的质量浓度和234U与238U的放射性活度比
Table 3. The Uranium concentration and 234U/238U activity ratio in water of the Jingjiang River Basin
样品编号 采样时间 ρ(238U)/(μg·L-1) A(234U)/A(238U) BSW-1 2013-06-27 2.15 1.21±0.08 HXSQ-1 2013-06-27 1.85 1.42±0.03 TKW-1 2013-06-27 1.33 1.38±0.02 TKW-2 2013-06-27 1.68 1.07±0.04 TKW-3 2014-11-08 0.55 1.11±0.08 BSW-2 2014-11-08 0.26 1.09±0.06 HXSQ-2 2014-11-08 0.56 1.08±0.05 TDLC 2014-11-08 0.19 1.04±0.07 HGT 2014-11-08 0.16 1.08±0.07
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表 4 锦江流域风化壳和基岩的主要化学元素的质量分数
Table 4. The main chemical elements in weathering crust and rock from Jinjiang River Basin
% 样品号 w(Na2O) w(MgO) w(K2O) w(CaO) w(P2O5) w(Fe2O3) w(Al2O3) w(SiO2) BSWXX-03 0.28 0.64 5.34 0.67 0.045 7 5.50 21.59 66.59 BSWXX-04 0.22 0.42 6.63 0.83 0.050 1 4.50 21.08 66.66 CJ-02 0.19 0.32 1.53 0.20 0.025 0 6.40 25.92 65.26 CJ-03 0.09 0.12 1.43 0.18 0.019 3 6.30 25.97 63.11 CJ-05 0.20 0.18 3.76 0.47 0.029 8 5.50 23.03 69.34 MW-01 0.13 0.17 2.60 0.34 0.036 6 7.30 26.02 62.30 MW-03 0.11 0.39 3.06 0.39 0.078 6 4.70 23.90 69.18 LZT-L < 0.10 0.48 1.66 < 0.01 0.070 0 6.55 16.85 66.48 LZT-R 0.11 0.45 1.62 < 0.01 0.070 0 8.38 18.97 61.02 FX-01 0.10 0.58 1.90 < 0.01 0.080 0 7.98 18.69 62.35 FX-02 < 0.10 0.60 1.58 < 0.01 0.010 0 8.82 20.71 58.24 FX-03 0.11 0.57 2.39 < 0.01 0.090 0 6.96 16.74 65.78 FX-04 < 0.10 0.58 1.67 < 0.01 0.060 0 6.32 16.82 64.91 BSWXX-Y 7.50 0.66 0.11 2.19 0.080 4 2.90 12.47 72.84 CJ-Y1 2.24 0.24 5.22 0.90 0.038 1 1.50 12.15 76.36
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表 5 表征风化程度的指标
Table 5. The proxy of characterizing the degree of weathering
样品号 硅铝率 硅铁率 硅铁铝率 CIA BSWXX-03 5.235 32.218 4.503 76.23 BSWXX-04 5.367 39.340 4.723 72.79 CJ-02 4.272 27.085 3.690 91.90 CJ-03 4.130 26.710 3.580 93.96 CJ-05 5.108 33.549 4.434 82.94 MW-01 4.063 22.689 3.446 88.89 MW-03 4.912 39.163 4.365 86.64 LZT-L 6.693 26.988 5.364 89.45 LZT-R 5.457 19.345 4.265 90.66 FX-01 5.671 20.822 4.457 89.29 FX-02 4.783 17.623 3.762 91.62 FX-03 6.683 25.195 5.282 85.70 FX-04 6.558 27.392 5.291 89.40 BSWXX-Y 9.913 66.610 8.628 43.12 CJ-Y1 10.662 135.202 9.883 52.50
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[1] 席承藩.论华南红色风化壳[J].第四纪研究, 1991(1):1-8. doi: 10.3321/j.issn:1001-7410.1991.01.001XI C F. On the red weathering crusts of southern China[J]. Quaternary Sciences, 1991(1):1-8. doi: 10.3321/j.issn:1001-7410.1991.01.001 [2] RIEBE C S, KIRCHNER J W, FINKEL R C. Erosional and climatic effects on long-term chemical weathering rates in granitic landscapes spanning diverse climate regimes[J]. Earth and Planetary Science Letters, 2004, 224(3/4):547-562. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=9b475e8cc350fae5b647c7e501fa68a2 [3] NUGENT M A, BRANTLEY S L, PANTANO C G, et al. The influence of natural mineral coatings on feldspar weathering[J]. Nature, 1998, 395:588-591. doi: 10.1038/26951 [4] SVERDRUP H, WARFVINGE P. Calculating field weathe-ring rates using a mechanistic geochemical model PROFILE[J]. Applied Geochemistry, 1993, 8(3):273-283. doi: 10.1016/0883-2927(93)90042-F [5] PACHECO F A L, VAN DER WEIJDEN C H. Integrating topography, hydrology and rock structure in weathering rate models of spring watersheds[J]. Journal of Hydrology, 2012, 428:32-50. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=5efe2ef3b361b19284600f9a198aa02c [6] 续海金, 马昌前.地壳风化速率研究综述[J].地球科学进展, 2002, 17(5):670-678. doi: 10.3321/j.issn:1001-8166.2002.05.007XU H J, MA C Q. Review on weathering rates in the crust weathering system[J]. Advance in Earth Sciences, 2002, 17(5):670-678. doi: 10.3321/j.issn:1001-8166.2002.05.007 [7] 黄来明, 邵明安, 贾小旭, 等.土壤风化速率测定方法及其影响因素研究进展[J].地球科学进展, 2016, 31(10):1021-1031. doi: 10.11867/j.issn.1001-8166.2016.10.1021HUANG L M, SHAO M A, JIA X X, et al. A review of the methods and controls of soil weathering rates[J]. Advances in Earth Science, 2016, 31(10):1021-1031. doi: 10.11867/j.issn.1001-8166.2016.10.1021 [8] GAO Q Z, TAO Z, HUANG X K, et al. Chemical weathering and CO2 consumption in the Xijiang River basin, South China[J]. Geomorphology, 2009, 106(3/4):324-332. doi: 10.1016-j.geomorph.2008.11.010/ [9] 李团结, 马玉, 刘昆.热带花岗岩海岛的化学风化及其环境效应——以东澳岛为例[J].环境化学, 2015, 34(8):1490-1497. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=hjhx201508014LI T J, MA Y, LIU K. Chemical weathering and its environmental effects of tropical granite island:a case study in DongAo Island[J].Environmental Chemistry, 2015, 34(8):1490-1497. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=hjhx201508014 [10] MA J L, WEI G J, XU Y G, et al. Mobilization and re-distribution of major and trace elements during extreme weathering of basalt in Hainan Island, South China[J]. Geochimica et Cosmochimica Acta, 2007, 71(13):3223-3237. doi: 10.1016/j.gca.2007.03.035 [11] FLEISCHER R L. Isotopic disequilibrium of uranium:alpha-recoil damage and preferential solution effects[J]. Science, 1980, 207:979-981. doi: 10.1126/science.207.4434.979 [12] OSMOND J K, RYDELL H S, KAUFMAN M I. Uranium disequilibrium in groundwater:an isotope dilution approach in hydrologic investigations[J]. Science, 1968, 162:997-999. doi: 10.1126/science.162.3857.997 [13] OSMOND J K, IVANOVICH M. Uranium-series mobilization and surface hydrology[M]. 2nd ed. Uranium-series disequilibrium:applications to earth, marine, and environmental sciences. Oxford:Clarendon Press, 1992:259-289. [14] CARROLL J L, MOORE W S. Uranium removal during low discharge in the Ganges-Brahmaputra mixing zone[J]. Geochimica et Cosmochimica Acta, 1993, 57(21/22):4987-4995. http://cn.bing.com/academic/profile?id=32f72aee797bfc8002af2dc64c104aea&encoded=0&v=paper_preview&mkt=zh-cn [15] BANNER J L. Radiogenic isotopes:systematics and applications to earth surface processes and chemical stratigraphy[J]. Earth-Science Reviews, 2004, 65(3/4):141-194. https://www.sciencedirect.com/science/article/abs/pii/S0012825203000862 [16] RIOTTE J, CHABAUX F. (234U/238U) activity ratios in freshwaters as tracers of hydrological processes:the Streng-bach watershed(Vosges, France)[J]. Geochimica et Cosmochimica Acta, 1999, 63(9):1263-1275. doi: 10.1016/S0016-7037(99)00009-5 [17] CHABAUX F, RIOTTE J, SCHMITT A D, et al. Variations of U and Sr isotope ratios in Alsace and Luxembourg rain waters:origin and hydrogeochemical implications[J]. Com-ptes Rendus Geoscience, 2005, 337(16):1447-1456. doi: 10.1016/j.crte.2005.07.008 [18] MOREIRA-NORDEMANN L M. Use of 234U/238U disequilibrium in measuring chemical weathering rate of rocks[J]. Geochimica et Cosmochimica Acta, 1980, 44(1):103-108. doi: 10.1016/0016-7037(80)90180-5 [19] 陈振宇, 黄国龙, 朱捌, 等.南岭地区花岗岩型铀矿的特征及其成矿专属性[J].大地构造与成矿学, 2014, 38(2):264-275. http://d.old.wanfangdata.com.cn/Periodical/ddgzyckx201402006CHEN Z Y, HUANG G L, ZHU B, et al. The characteristics and metallogenic specialization of granite-hosted uranium deposits in the Nanling Region[J]. Geotectonica et Metallogenia, 2014, 38(2):264-275. http://d.old.wanfangdata.com.cn/Periodical/ddgzyckx201402006 [20] 王振民, 郭日恒, 傅叙.区域地质调查报告韶关幅[M].广州:广东省地质局, 1982:11-392. [21] 王文星, 陈洁雯, 钟立华, 等.仁化县气候季节变化特征分析[J].广东气象, 2016, 38(5):37-41. doi: 10.3969/j.issn.1007-6190.2016.05.009WANG W X, CHEN J W, ZHONG L H, et al. Analysis of the characteristics of seasonal variation of the climate of Renhua County[J]. Guangdong Qixiang, 2016, 38(5):37-41. doi: 10.3969/j.issn.1007-6190.2016.05.009 [22] 彭华, 刘盼, 张桂花.中国东南部丹霞地貌区小尺度植被分异结构研究[J].地理科学, 2018, 38(6):944-953. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dlkx201806014PENG H, LIU P, ZHANG G H. Small scale vegetation di-fferentiation structure in Danxia Landforms, Southeast China[J]. Scientia Geographica Sinica, 2018, 38(6):944-953. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dlkx201806014 [23] LANGMUIR D. Uranium solution-mineral equilibria at low temperatures with applications to sedimentary ore deposits[J]. Geochimica et Cosmochimica Acta, 1978, 42(6):547-569. doi: 10.1016/0016-7037(78)90001-7 [24] LANGMUIR D, HERMAN J S. The mobility of thorium in natural waters at low temperatures[J]. Geochimica et Cosmochimica Acta, 1980, 44(11):1753-1766. doi: 10.1016/0016-7037(80)90226-4 [25] CHABAUX F, DEQUINCEY O, LÉVČQUE J J, et al. Tra-cing and dating recent chemical transfers in weathering pro-files by trace-element geochemistry and 238U-234U-230Th disequilibria:the example of the Kaya lateritic toposequence(Burkina-Faso)[J]. Comptes Rendus Geoscience, 2003, 335(16):1219-1231. doi: 10.1016/j.crte.2003.10.007 [26] ROSHOLT J N, DOE B R, TATSUMOTO M. Evolution of the isotopic composition of uranium and thorium in soil profiles[J]. Geological Society of America Bulletin, 1966, 77(9):987-1004. doi: 10.1130/0016-7606(1966)77[987:EOTICO]2.0.CO;2 [27] LATHAM A G, SCHWARCZ H P. On the possibility of determining rates of removal of uranium from crystalline igneous rocks using U-series disequilibria—1:a U-leach model, and its applicability to whole-rock data[J]. App-lied geochemistry, 1987, 2(1):55-65. doi: 10.1016/0883-2927(87)90060-6 [28] LATHAM A G, SCHWARCZ H P. On the possibility of determining rates of removal of uranium from crystalline igneous rocks using U-series disequilibria—2:applicability of a U-leach model to mineral separates[J]. Applied Geochemistry, 1987, 2(1):67-71. doi: 10.1016/0883-2927(87)90061-8 [29] MA L, CHABAUX F, PELT E, et al. Regolith production rates calculated with uranium-series isotopes at Susquehanna/Shale Hills Critical Zone Observatory[J]. Earth and Planetary Science Letters, 2010, 297(1/2):211-225. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=a9871fb418821f22206c01ab1540d995 [30] 叶永钦, 叶松鑫, 许幼, 等.粤北长江铀矿田长排地区花岗岩体地球化学特征及其意义[J].地球科学与环境学报, 2015, 37(6):101-110. doi: 10.3969/j.issn.1672-6561.2015.06.009YE Y Q, YE S X, XU Y, et al. Geochemical characteristics of granite body in Changpai area of Changjiang Uranium Orefield, the northern Guangdong and their significance[J]. Journal of Earth Sciences and Environment, 2015, 37(6):101-110. doi: 10.3969/j.issn.1672-6561.2015.06.009 [31] OSMOND J K, COWART J B. The theory and uses of na-tural uranium isotopic variations in hydrology[J]. Atomic Energy Review, 1976, 14(4):621-679. [32] IVANOVICH M, HARMON R S. Uranium series disequilibrium:applications to environmental problems[M]. Oxford:Oxford University Press, 1982:23-37. [33] 王玉生, 王新武.粤北铀矿定位场[J].铀矿地质, 2000, 16(6):353-361. doi: 10.3969/j.issn.1000-0658.2000.06.005WANG Y S, WANG X W. Localization field of uranium deposits in northern Guangdong[J]. Uranium Geology, 2000, 16(6):353-361. doi: 10.3969/j.issn.1000-0658.2000.06.005 [34] DOSSETO A, BOURDON B, TURNER S P. Uranium-series isotopes in river materials:insights into the timescales of erosion and sediment transport[J]. Earth and Planetary Science Letters, 2008, 265(1/2):1-17. https://www.journals.elsevier.com/earth-and-planetary-science-letters/frontiers-papers-pre-2011/uranium-series-isotopes-in-river-materials-insights [35] KURTZ A C, DERRY L A, CHADWICK O A. Accretion of Asian dust to Hawaiian soils:isotopic, elemental, and mineral mass balances[J]. Geochimica et Cosmochimica Acta, 2001, 65(12):1971-1983. doi: 10.1016/S0016-7037(01)00575-0 [36] PETT-RIDGE J C, MONASTRA V M, DERRY L A, et al. Importance of atmospheric inputs and Fe-oxides in controlling soil uranium budgets and behavior along a Hawaiian chronosequence[J]. Chemical Geology, 2007, 244(3/4):691-707. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=d789eb46f59df2edf07b295e2ce62a95 [37] DIA A, CHAUVEL C, BULOURDE M, et al. Eolian contribution to soils on Mount Cameroon:isotopic and trace element records[J]. Chemical Geology, 2006, 226(3/4):232-252. http://cn.bing.com/academic/profile?id=e1c1102271e9b78dfe2cf679cde7886f&encoded=0&v=paper_preview&mkt=zh-cn [38] PELT E, CHABAUX F, STILLE P, et al. Atmospheric dust contribution to the budget of U-series nuclides in soils from the Mount Cameroon volcano[J]. Chemical Geo-logy, 2013, 341:147-157. doi: 10.1016/j.chemgeo.2013.01.008 [39] 魏志强, 钟巍, 陈永强, 等.亚热带季风区湖沼流域表生地球化学元素研究——以江西定南大湖为例[J].地理科学进展, 2015, 34(7):909-917. http://www.cnki.com.cn/Article/CJFDTotal-DLKJ201507012.htmWEI Z Q, ZHONG W, CHEN Y Q, et al. Supergene geochemical elements of swampy basin in the subtropical monsoon region:a case study of Dingnan Dahu in Jiangxi Province[J]. Progress in Geography, 2015, 34(7):909-917. http://www.cnki.com.cn/Article/CJFDTotal-DLKJ201507012.htm [40] ANDERSSON P S, PORCELLI D, WASSERBURG G J, et al. Particle transport of 234U-238U in the Kalix River and in the Baltic Sea[J]. Geochimica et Cosmochimica Acta, 1998, 62(3):385-392. doi: 10.1016/S0016-7037(97)00342-6 [41] JIN L, RAVELLA R, KETCHUM B, et al. Mineral weathering and elemental transport during hillslope evolution at the Susquehanna/Shale Hills Critical Zone Observatory[J]. Geochimica et Cosmochimica Acta, 2010, 74(13):3669-3691. doi: 10.1016/j.gca.2010.03.036 [42] LIENERT C, SHORT S A, VON GUNTEN H R. Uranium infiltration from a river to shallow groundwater[J]. Geo-chimica et Cosmochimica Acta, 1994, 58(24):5455-5463. doi: 10.1016/0016-7037(94)90242-9 [43] PORCELLI D, ANDERSSON P S, WASSERBURG G J, et al. The importance of colloids and mires for the transport of uranium isotopes through the Kalix River watershed and Baltic Sea[J]. Geochimica et Cosmochimica Acta, 1997, 61(19):4095-4113. doi: 10.1016/S0016-7037(97)00235-4 [44] PLATER A J, IVANOVICH M, DUGDALE R E. Uranium series disequilibrium in river sediments and waters:the significance of anomalous activity ratios[J]. Applied Geochemistry, 1992, 7(2):101-110. http://cn.bing.com/academic/profile?id=91a7aef76e5f5ea4635d3657b25d5892&encoded=0&v=paper_preview&mkt=zh-cn [45] 朱照宇, 谢久兵, 王彦华, 等.华南沿海地表红土地球化学特性变异的自然因素与人类活动干预[J].第四纪研究, 2004, 24(4):402-408. doi: 10.3321/j.issn:1001-7410.2004.04.005ZHU Z Y, XIE J B, WANG Y H et al. The natural factors and artificial disturbance of variation in geochemistry characteristics of red soil on land surface along the coast of South China [J]. Quaternary Sciences, 2004, 24(4):402-408. doi: 10.3321/j.issn:1001-7410.2004.04.005 [46] NESBITT H W, YOUNG G M. Early Proterozoic climates and plate motions inferred from major element chemistry of lutites[J]. Nature, 1982, 299:715-717. doi: 10.1038/299715a0 [47] EYNATTEN H V, BARCELÓ-VIDAL C, PAWLOWSKY-GLAHN V. Modelling compositional change:the example of chemical weathering of granitoid rocks[J]. Mathematical Geology, 2003, 35(3):231-251. http://cn.bing.com/academic/profile?id=926e74ab3dd60b73e9b6a6a3cd60a8b8&encoded=0&v=paper_preview&mkt=zh-cn [48] MCLENNAN S M. Weathering and global denudation[J]. The Journal of Geology, 1993, 101(2):295-303. http://d.old.wanfangdata.com.cn/NSTLQK/NSTL_QKJJ0226531170/ [49] NESBITT H W, YOUNG G M. Formation and diagenesis of weathering profiles[J]. The Journal of Geology, 1989, 97(2):129-147. doi: 10.1086-629290/ [50] 周尚哲, 朱丽东, 李淑珍, 等.南岭夷平面风化壳发育时间问题探讨——以粤北大布镇剖面为例[J].山地学报, 2013, 31(1):1-7. doi: 10.3969/j.issn.1008-2786.2013.01.001ZHOU S Z, ZHU L D, LI S Z, et al. Discussion of the weathering crust development time on the Nanling Planation Surface——take the Dabuzhen as an example[J]. Journal of Mountain Science, 2013, 31(1):1-7. doi: 10.3969/j.issn.1008-2786.2013.01.001 [51] 杨金玲, 张甘霖, 黄来明.典型亚热带花岗岩地区森林流域岩石风化和土壤形成速率研究[J].土壤学报, 2013, 50(2):253-259. http://d.old.wanfangdata.com.cn/Periodical/trxb201302005YANG J L, ZHANG G L, HUANG L M. Rock weathering and soil formation rates of a forested watershed in the typi-cal subtropical granite area[J]. Acta Pedologica Sinica, 2013, 50(2):253-259. http://d.old.wanfangdata.com.cn/Periodical/trxb201302005 -
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