长江铀矿田花岗岩与铀成矿年代学研究进展

doi:10.11720/wtyht.2022.1442

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Abstract

The Changjiang uranium ore field is located in the south-central part of the Zhuguangshan pluton in northern Guangdong Province. This ore field holds many uranium deposits such as Mianhuakeng (302), Shulouqiu (305), and Changpai. These uranium deposits are mainly distributed along the contact parts between the Changjiang and Youdong plutons, and uranium mineralization is closely related to the Changjiang and Youdong plutons and their intrusive dykes. Previous researchers have conducted much testing on the formation ages of plutons, dykes, and deposits in the Changjiang ore field, obtaining abundant age data. This study summarized the chronological study advances of the granites, uranium mineralization, and dykes in the Changjiang uranium ore field. The results are as follows. The Changjiang biotite granite pluton was formed at 166~157 Ma (weighted average age: 160.9 Ma) during the Middle-Late Jurassic. The Youdong two-mica granite pluton was formed at 245.6~219.6 Ma (weighted average age: 232.1 Ma) during the Triassic. A variety of dykes such as gabbro diorites, hornblende diabases, fine-grained granitic rocks, and lamprophyres have developed in the study area. The dykes in the ore field can be divided into at least three categories according to their activity stages, namely Late Jurassic mafic dykes (150~145.1 Ma), Early Cretaceous acid dykes (138.6~123.9 Ma), and Early Cretaceous mafic dykes (110 Ma). The uranium mineralization of the Changjiang uranium ore field began during the Early Cretaceous and lasted until the Paleocene, showing a long time span ranging from 127 to 60 Ma. The uranium metallogenic periods include the Early Cretaceous metallogenic epoch (127~119 Ma), the Late Cretaceous metallogenic epoch (75~67 Ma), and the Paleocene metallogenic epoch (61~54 Ma). The age data are concentrated in the range of 70~60 Ma (Late Cretaceous-Paleocene), which might be the peak of uranium mineralization of the study area. The diagenesis and uranium mineralization of the Changjiang uranium ore field evolved in the order of Youdong pluton → Changjiang pluton → early mafic dykes → fine-grained granitic dykes → early uranium mineralization stage → fine-grained biotite granite dykes → late mafic dykes → second uranium mineralization stage → late uranium mineralization stage. There are six phases of diagenesis and uranium mineralization of the Changjiang uranium ore field, i.e., Triassic granitic magmatism (the Youdong pluton), Middle-Late Jurassic granitic magmatism (the Changjiang pluton), diagenesis of Late Jurassic mafic dykes (gabbro diorite dykes, 150 Ma; hornblende diabase dykes, 145 Ma), diagenesis of Early Cretaceous dykes and uranium mineralization (138.6~110 Ma), Late Cretaceous uranium mineralization (75~67 Ma), and Paleocene uranium mineralization (61~54 Ma). It is recommended that further studies should be conducted on the metallogenic chronology of uranium deposits, the geochronology of other dykes such as lamprophyres, and the uranium metallogenic mechanisms of deposits except for Mianhuakeng (302), Shulouqiu(305), and Changpai.

Key words： Changjiang uranium ore field diagenetic age metallogenic age mineralization study advance

Received: 15 August 2021 Published: 03 January 2023

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Wei-Ping ZHU. Chronological study advances of the granites and uranium mineralization in the Changjiang uranium ore-field[J]. Geophysical and Geochemical Exploration, 2022, 46(6): 1327-1337.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1442 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I6/1327

7](a) and regional structural location(b) of Changjiang uranium ore-field
1—Quaternary system; 2—Yanshanian medium fine-grained mica granite; 3—Yanshanian medium-grained porphyritic biotite granite; 4—Indosinian coarse-grained mica granite; 5—Indosinian coarse-grained biotite granite; 6—Caledonian granodiorite; 7—Mesozoic volcanic rocks; 8—Mesozoic granite; 9—diabase; 10—gabbro diorite; 11—fault structural zone; 12—geological boundary; 13—uranium deposit; 14—location;15—sampling position and number
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Geological map^[7](a) and regional structural location(b) of Changjiang uranium ore-field
1—Quaternary system; 2—Yanshanian medium fine-grained mica granite; 3—Yanshanian medium-grained porphyritic biotite granite; 4—Indosinian coarse-grained mica granite; 5—Indosinian coarse-grained biotite granite; 6—Caledonian granodiorite; 7—Mesozoic volcanic rocks; 8—Mesozoic granite; 9—diabase; 10—gabbro diorite; 11—fault structural zone; 12—geological boundary; 13—uranium deposit; 14—location;15—sampling position and number

	样号	采用位置	岩性	分析方法	年龄/Ma	N	MSWD	资料来源
长江岩体年龄	Y1	302、301坑口	中粒黑云母花岗岩	锆石U-Pb法	163.6±12.5	-	-	邓访陵(1987)^[9]
	Y1	302、301坑口	中粒黑云母花岗岩	Rb-Sr全岩等时线年龄	170.7±3.9	-	-	邓访陵(1987)^[9]
	Y2 Y3	长江岩体	中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	143±1.2	-	0.9	朱捌(2010)^[10]
	Y4	长江镇至邓屋镇	中粒黑云母花岗岩	SHRIMP锆石 U-Pb	160±2.0	9	1.8	朱捌(2010)^[10]、邓平等(2011)^[11]
	Y5	棉花坑钻孔	中粗粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	157.2±1.7	17	1.8	黄国龙等(2014)^[12]
	Y6	棉花坑铀钻孔	中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	159.5±1.2	18	1.15	黄国龙等(2014)^[12]
	Y7	棉花坑钻孔	细粒不等粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	161.6±2.1	15	2.5	黄国龙等(2014)^[12]
	Y8	岩体钻孔岩心 ZK211-3	花岗岩	LA-ICP-MS锆石 U-Pb	157.6±1.8	15	0.084	田泽瑾(2014)^[13]
	Y9	ZK304-3	花岗岩	LA-ICP-MS锆石 U-Pb	158.8±1.9	14	0.27	田泽瑾(2014)^[13]
	Y10	302矿床9号带钻孔和坑道	中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	164±2.0	13	6.3	傅丽雯(2015)^[14]
	Y11 Y12	长江岩体	中粗粒黑云母花岗岩	电子探针	157±3.2	14	0.069	张龙(2016)^[15]、张龙等(2016)^[16]
	Y13	油洞岩体	长江岩体花岗岩	电子探针	160±3.3	22	0.32	张龙(2016)^[15]
	Y14	棉花坑KZK11-3 海拔141.15~ -168.19 m	含晶质铀矿花岗岩 (长江岩体)	电子探针	165±2.5	28	0.25	张龙(2016)^[15]
	Y15	具体位置不清	中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	166±3.0	19	3.1	孙立强(2018)^[17]
	Y16	长江镇南侧锦原矿业公司东侧山坡上 E113.939898°, N25.302975°	中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	161±1.0	17	0.24	钟福军(2018)^[18]
	Y17	长江镇南侧锦原矿业公司东侧山坡上 E113.939898°, N25.302975°	中粒黑云母花岗岩	SHRIMP锆石 U-Pb	162.9±1.1	16	0.38	钟福军(2018)^[18]
	Y18	书楼丘凌溪村露头+ ZK26-1 海拔320~-150 m	辉长闪长岩捕获了中粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	165±2.0	6	0.96	钟福军等(2019)^[7]
	Y19	长江岩体	中粗粒黑云母花岗岩	LA-ICP-MS独居石	156.8±1.7	14	0.76	陈妍(2021)^[19]
油洞岩体年龄	Y20	油洞岩体	二云母花岗岩	LA-ICP-MS锆石 U-Pb	233.9±6.3	-	7.7	张敏(2006)^[20]
	Y21	仁化县至长江镇 E113°56'59.2″, N25°18'41.2″	中粒小斑状二云母花岗岩	SHRIMP锆石 U-Pb	232±4.0	12	3.2	朱捌(2010)^[10]、黄国龙等(2012)^[21]
	Y22	油洞岩体	花岗岩	电子探针	225±5.4	17	0.51	张龙(2016)^[15]
	Y11	油洞岩体	花岗岩	LA-ICP-MS锆石 U-Pb	226.4±3.5	15	0.83	Zhang L,et al.(2018)^[4]
	Y23	长江镇东南下学塘垇村新修公路 E113.972855°, N25.298562°	中粗粒小斑状二云母花岗岩	LA-ICP-MS锆石 U-Pb	244±1.6	18	0.091	钟福军(2018)^[18]
	Y24	油洞岩体	中粗粒二云母花岗岩	LA-ICP-MS独居石定年	228±1.5	23	0.83	陈妍等(2021)^[19]
	样号	采用位置	岩性	分析方法	年龄/Ma	N	MSWD	资料来源
脉岩年龄	Y25	油洞断裂带	角闪辉绿岩	全岩Ar-Ar定年	110.6±2.0	-	-	曹豪杰(2013)^[22]
	Y26	长江矿田	角闪辉绿岩	角闪石Ar-Ar	145.1±1.5	-	-	Zhang L,et al. (2018)^[4]
	Y18	书楼丘凌溪村露头+ ZK26-1海拔 320~-150 m	辉长闪长岩	LA-ICP-MS锆石 U-Pb	150±1.0	17	0.18	钟福军等(2019)^[7]
	Y27	棉花坑9号矿带南段钻孔深部	细粒花岗质脉岩	LA-ICP-MS锆石 U-Pb	138.6±1.3	16	0.81	徐文雄等(2014)^[23]
	Y28	棉花坑 ZK15-9 海拔约-105m	细粒黑云母花岗岩	LA-ICP-MS锆石 U-Pb	123.9±1.3	15	1.3	周航兵等(2018)^[24]
书楼丘铀矿床	Y29	书楼丘 ZK16-4 海拔-72.36 m	微晶石英脉型铀矿	LA-ICP-MS原位锆石 U-Pb	71.4±1.3	16	2.2	钟福军等(2019)^[25]
	Y30	书楼丘 ZK26-1 海拔-75.89 m	碎裂岩型铀矿	LA-ICP-MS原位锆石U-Pb	74.4±1.7	9	1.5	钟福军等(2019)^[25]
	Y31	书楼丘 ZK87-1 海拔112.30 m	碎裂煌斑岩型沥青铀矿	LA-ICP-MS锆石 U-Pb	71.3±1.1	15	1.6	郑国栋等(2021)^[26]
棉花坑铀矿床	Y32	棉花坑9号矿脉	角砾状沥青铀矿 (早期矿化年龄)	U-Pb 溶液法	127	-	-	张国全(2008)^[27]
	Y33	棉花坑9号矿脉	“红化”沥青铀矿 (主成矿年龄)	U-Pb 溶液法	54	-	-	张国全(2008)^[27]
	Y34	棉花坑ZK37-3 海拔653 m	碱交代岩钾长石	K-Ar	81.96±1.76	-	-	张爱等(2009)^[28]
	06148等	棉花坑	沥青铀矿	²³⁵U-²⁰⁴Pb等时线	68.7±3.0	8	665	黄国龙等(2010)^[29]
	06148等	棉花坑	沥青铀矿	Sm-Nd等时线	70±11	7	0.50	黄国龙等(2010)^[29]
	Y11 Y12	长江岩体	沥青铀矿	电子探针	75±2.1	5	1.64	张龙(2016)^[15]、张龙等(2016)^[16]
	Y11 Y12	长江岩体	沥青铀矿	电子探针	104±1.6	20	1.60	张龙(2016)^[15]、张龙等(2016)^[16]
	Y14	棉花坑Ⅳ-1带	沥青铀矿	电子探针	67±4.1	4	5.2	张龙(2016)^[15]
	Y14	棉花坑Ⅳ-1带	沥青铀矿	电子探针	94±1.1	14	0.82	张龙(2016)^[15]
	Y14	棉花坑Ⅳ-1带	沥青铀矿	电子探针	103±1.8	18	1.9	张龙(2016)^[15]
	Y14	棉花坑Ⅳ-1带	沥青铀矿	电子探针	119±3.5	4	0.37	张龙(2016)^[15]
	Y14	棉花坑Ⅳ-2带	沥青铀矿	电子探针	67±2.1	12	8.3	张龙(2016)^[15]
	Y36	棉花矿坑海拔150 m	石英脉	LA-ICP-MS原位锆石U-Pb	90±43	12	1.4	Chrstophe B,et al. (2018)^[30]
	Y37	棉花矿坑海拔150 m	石英脉	LA-ICP-MS原位锆石U-Pb	93±15	6	2.5	Chrstophe B,et al. (2018)^[30]
	Y38	棉花坑 KZK39-3 海拔-268.95 m	铀矿石	LA-ICP-MS原位锆石U-Pb	59.5±1.0	10	0.39	Zhong F J, et al. (2018)^[31]
	Y39	棉花坑	铀矿石	LA-ICP-MS原位锆石U-Pb	60.0±0.5	21	1.13	Zhong F J, et al. (2018)^[31]
	Y40	棉花坑坑道采场海拔-150 m	碎裂岩型铀矿	LA-ICP-MS原位锆石 U-Pb	60.8±0.6	30	0.31	钟福军等(2019)^[25]
	Y41	棉花坑 ZK26-2 海拔115.89 m	微晶石英脉型铀矿	LA-ICP-MS原位锆石U-Pb	66.8±1.6	16	3.8	钟福军等(2019)^[25]
	样号	采用位置	岩性	分析方法	年龄/Ma	N	MSWD	资料来源
长排铀矿床	Y42	长排ZK1-1 海拔138.56 m	萤石碎裂岩型铀矿	LA-ICP-MS原位锆石U-Pb	62.4±2.5	8	2.4	钟福军等(2019)^[25]
长排铀矿床	Y43	长排ZK205-3 海拔67.18 m	微晶石英脉型铀矿	LA-ICP-MS原位锆石U-Pb	70.2±0.5	22	2.0	钟福军等(2019)^[25]
	Y44	扶溪岩体	花岗闪长岩	LA-ICP-MS锆石 U-Pb	440.7±3.3	18	2.4	于玉帅等(2017)^[32]
	Y45	扶溪岩体	花岗岩	LA-ICP-MS锆石 U-Pb	426.7±5.4 (402.2~451.6)	20	1.4	Zhang L, et al. (2018)^[4]

Ages of Granite and uranium mineralization in the Changjiang uranium ore-field

Age probability distribution of Changjiang rock mass

Age probability distribution of Youdong rock mass

Age probability distribution of veins in Changjiang uranium ore-field

Mineralization age probability distribution of Mianhuakeng uranium deposits

Illustration of rock mass formation and uranium mineralization evolution stage of Changjiang uranium ore-field

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