Petrogenesis and Tectonic Implications of Granite Porphyry Veins in the Shangjiao Uranium Deposit, Eastern Nanling Range

doi:10.19657/j.geoscience.1000-8527.2024.062

Abstract

Abstract:

To further constrain the Mesozoic geodynamic background and tectonic evolution of South China, this study investigates zircon U-Pb geochronology, Hf isotopes, and geochemical characteristics of granite porphyry from the Shangjiao Uranium Deposit in the Longyuanba pluton.Zircon U-Pb dating yields weighted mean ²⁰⁶Pb/²³⁸U ages of (190.6±2.2) Ma (MSWD=0.11) and (190.6±1.3) Ma, indicating Early Jurassic emplacement.Bulk-rock analyses reveal the granite porphyry is characterized by high silica (SiO₂=68.97%-69.56%), alkali enrichment (Na₂O+K₂O=9.12%-9.28%), and depletion in calcium (CaO=0.50%-1.22%), magnesium (MgO=0.09%-0.11%), and phosphorus (P₂O₅=0.05%), classifying as high-K calc-alkaline (σ=3.16-3.27) metaluminous to weakly peraluminous rocks (A/CNK=0.98-1.09).Geochemically, the rocks show enrichment in large-ion lithophile elements (Rb, Th, U), depletion in high-field-strength elements (Zr, Hf, Nb, Ta, Ti), light rare earth element enrichment with negative Eu anomalies, and heavy rare earth element depletion, collectively indicating an A-type granite affinity.Zircon ε_Hf(t) values range from+5.39 to+9.07 (average+6.91), corresponding to two-stage model ages (T_DM2) of 652-887 Ma, suggesting derivation primarily from Neoproterozoic juvenile mafic crust formed through mantle magma differentiation.The granite porphyry formed in an intraplate extensional setting during Paleo-Pacific Plate subduction, with the Longyuanba pluton serving as critical evidence for the tectonic transition between the Paleo-Tethyan and Paleo-Pacific regimes.Combined with the chronological characteristics of regional magmatic rocks and the tectonic setting of South China, it was concluded that the transition from the Tethy orogenic regime to the Paleo-Pacific tectonic regime already started before 190 Ma.

Key words: zircon U-Pb geochronology, Hf isotope, geochemical signature, tectonic setting, granite porphyry, Shangjiao uranium deposit

CLC Number:

LAI Jing, LIU Wenquan, ZHONG Fujun. Petrogenesis and Tectonic Implications of Granite Porphyry Veins in the Shangjiao Uranium Deposit, Eastern Nanling Range[J]. Geoscience, 2025, 39(02): 277-293.

Figures/Tables 17

References 85

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分析点号	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb(σ)	²⁰⁷Pb/ ²³⁵U(σ)	²⁰⁶Pb/ ²³⁸U(σ)	²⁰⁷Pb/²⁰⁶Pb (σ)(Ma)		²⁰⁷Pb/²³⁵U (σ)(Ma)	²⁰⁶Pb/²³⁸U (σ)(Ma)	谐和度 (%)
分析点号	(10^-6)		Th/U	²⁰⁷Pb/ ²⁰⁶Pb(σ)	²⁰⁷Pb/ ²³⁵U(σ)	²⁰⁶Pb/ ²³⁸U(σ)	²⁰⁷Pb/²⁰⁶Pb (σ)(Ma)		²⁰⁷Pb/²³⁵U (σ)(Ma)	²⁰⁶Pb/²³⁸U (σ)(Ma)	谐和度 (%)
HS84-1	93	303	0.31	0.05212(0.00331)	0.21668(0.01085)	0.03015(0.00071)	300(144)	199(9)		191(4)	0.96
HS84-2	104	258	0.40	0.05230(0.00270)	0.21624(0.01227)	0.02998(0.00090)	298(119)	199(10)		190(6)	0.99
HS84-3	41	159	0.26	0.05379(0.00388)	0.22309(0.01693)	0.03007(0.00078)	361(163)	204(14)		191(5)	0.95
HS84-4	152	378	0.40	0.04777(0.00382)	0.19772(0.01570)	0.03001(0.00098)	87(246)	183(13)		191(6)	0.93
HS84-5	110	274	0.40	0.05117(0.00184)	0.21180(0.00837)	0.03001(0.00067)	256(81)	195(7)		191(4)	0.94
HS84-6	88	258	0.34	0.05219(0.00211)	0.21578(0.00868)	0.02998(0.00049)	295(93)	198(7)		190(3)	0.96
HS84-7	301	576	0.52	0.05428(0.00272)	0.22477(0.01511)	0.03002(0.00088)	383(118)	206(13)		191(6)	0.96
HS84-8	129	278	0.46	0.05232(0.00281)	0.21550(0.01438)	0.02986(0.00101)	298(122)	198(12)		190(6)	0.97
HS84-9	95	278	0.34	0.05102(0.00271)	0.21093(0.01146)	0.02997(0.00053)	243(119)	194(10)		190(3)	0.93
HS84-10	168	341	0.49	0.05261(0.00420)	0.21920(0.01193)	0.03021(0.00090)	322(181)	201(10)		192(6)	0.95
HS84-11	105	289	0.36	0.05040(0.00321)	0.20911(0.01237)	0.03008(0.00106)	213(148)	193(10)		191(7)	0.95
HS84-12	94	300	0.31	0.05428(0.00342)	0.22574(0.01149)	0.03015(0.00085)	383(141)	207(10)		191(5)	0.91
HS84-13	96	244	0.39	0.05193(0.00233)	0.21428(0.00991)	0.02991(0.00064 )	283(106)	197(8)		190(4)	0.92
HS84-14	71	224	0.32	0.04928(0.00191)	0.20344(0.00743)	0.02993(0.00054)	161(86)	188(6)		190(3)	0.95
HS84-15	100	288	0.35	0.05251(0.00258)	0.21719(0.01094)	0.02999(0.00066)	309(113)	200(9)		190(4)	0.97
HS85-1	199	497	0.40	0.051878(0.002058)	0.214667(0.009675)	0.030005(0.000439)	280(91)	197(8)		191(3)	0.89
HS85-2	81	302	0.27	0.054915(0.003502)	0.223128(0.014475)	0.029463(0.000528)	409(143)	205(12)		187(3)	0.87
HS85-3	375	774	0.48	0.053655(0.001485)	0.225616(0.0067)	0.030491(0.000445)	367(58)	207(6)		194(3)	0.91
HS85-4	98	307	0.32	0.049646(0.00302)	0.205584(0.011211)	0.030028(0.000526)	189(145)	190(9)		191(3)	0.85
HS85-5	278	554	0.50	0.052706(0.001871)	0.218618(0.007578)	0.030078(0.00036)	317(81)	201(6)		191(2)	0.097
HS85-6	172	498	0.35	0.04820(0.001683)	0.199572(0.007025)	0.030024(0.000394)	109(79)	185(6)		191(2)	0.95
HS85-7	64	217	0.30	0.051373(0.002832)	0.211672(0.010994)	0.029877(0.000463)	257(132)	195(9)		190(3)	0.99
HS85-8	129	342	0.38	0.050726(0.002005)	0.209678(0.008078)	0.029973(0.000447)	228(58)	193(7)		190(3)	0.92
HS85-9	53	203	0.26	0.047191(0.002886)	0.194641(0.011236)	0.029908(0.000391)	58(141)	181(10)		190(2)	0.90
HS85-10	147	366	0.40	0.052106(0.00258)	0.216024(0.010695)	0.030063(0.000531)	300(113)	199(9)		191(3)	0.96
HS85-11	68	242	0.28	0.04904(0.002576)	0.201075(0.010676)	0.029731(0.000448)	150(156)	186(9)		189(3)	0.96
HS85-12	114	344	0.33	0.05406(0.002353)	0.224155(0.010361)	0.030068(0.000418)	372(103)	205(9)		191(3)	0.90
HS85-13	368	732	0.50	0.05511(0.001637)	0.229598(0.006954)	0.030211(0.000284)	417(67)	210(6)		192(2)	0.98
HS85-14	92	237	0.39	0.047874(0.003394)	0.195332(0.012832)	0.029587(0.000515)	100(154)	181(11)		188(3)	0.97
HS85-15	178	459	0.39	0.049037(0.002185)	0.202944(0.008467)	0.03001(0.000387)	150(104)	188(7)		191(2)	0.95

分析点号	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb(σ)	²⁰⁷Pb/ ²³⁵U(σ)	²⁰⁶Pb/ ²³⁸U(σ)	²⁰⁷Pb/²⁰⁶Pb (σ)(Ma)		²⁰⁷Pb/²³⁵U (σ)(Ma)	²⁰⁶Pb/²³⁸U (σ)(Ma)	谐和度 (%)
分析点号	(10^-6)		Th/U	²⁰⁷Pb/ ²⁰⁶Pb(σ)	²⁰⁷Pb/ ²³⁵U(σ)	²⁰⁶Pb/ ²³⁸U(σ)	²⁰⁷Pb/²⁰⁶Pb (σ)(Ma)		²⁰⁷Pb/²³⁵U (σ)(Ma)	²⁰⁶Pb/²³⁸U (σ)(Ma)	谐和度 (%)
HS84-1	93	303	0.31	0.05212(0.00331)	0.21668(0.01085)	0.03015(0.00071)	300(144)	199(9)		191(4)	0.96
HS84-2	104	258	0.40	0.05230(0.00270)	0.21624(0.01227)	0.02998(0.00090)	298(119)	199(10)		190(6)	0.99
HS84-3	41	159	0.26	0.05379(0.00388)	0.22309(0.01693)	0.03007(0.00078)	361(163)	204(14)		191(5)	0.95
HS84-4	152	378	0.40	0.04777(0.00382)	0.19772(0.01570)	0.03001(0.00098)	87(246)	183(13)		191(6)	0.93
HS84-5	110	274	0.40	0.05117(0.00184)	0.21180(0.00837)	0.03001(0.00067)	256(81)	195(7)		191(4)	0.94
HS84-6	88	258	0.34	0.05219(0.00211)	0.21578(0.00868)	0.02998(0.00049)	295(93)	198(7)		190(3)	0.96
HS84-7	301	576	0.52	0.05428(0.00272)	0.22477(0.01511)	0.03002(0.00088)	383(118)	206(13)		191(6)	0.96
HS84-8	129	278	0.46	0.05232(0.00281)	0.21550(0.01438)	0.02986(0.00101)	298(122)	198(12)		190(6)	0.97
HS84-9	95	278	0.34	0.05102(0.00271)	0.21093(0.01146)	0.02997(0.00053)	243(119)	194(10)		190(3)	0.93
HS84-10	168	341	0.49	0.05261(0.00420)	0.21920(0.01193)	0.03021(0.00090)	322(181)	201(10)		192(6)	0.95
HS84-11	105	289	0.36	0.05040(0.00321)	0.20911(0.01237)	0.03008(0.00106)	213(148)	193(10)		191(7)	0.95
HS84-12	94	300	0.31	0.05428(0.00342)	0.22574(0.01149)	0.03015(0.00085)	383(141)	207(10)		191(5)	0.91
HS84-13	96	244	0.39	0.05193(0.00233)	0.21428(0.00991)	0.02991(0.00064 )	283(106)	197(8)		190(4)	0.92
HS84-14	71	224	0.32	0.04928(0.00191)	0.20344(0.00743)	0.02993(0.00054)	161(86)	188(6)		190(3)	0.95
HS84-15	100	288	0.35	0.05251(0.00258)	0.21719(0.01094)	0.02999(0.00066)	309(113)	200(9)		190(4)	0.97
HS85-1	199	497	0.40	0.051878(0.002058)	0.214667(0.009675)	0.030005(0.000439)	280(91)	197(8)		191(3)	0.89
HS85-2	81	302	0.27	0.054915(0.003502)	0.223128(0.014475)	0.029463(0.000528)	409(143)	205(12)		187(3)	0.87
HS85-3	375	774	0.48	0.053655(0.001485)	0.225616(0.0067)	0.030491(0.000445)	367(58)	207(6)		194(3)	0.91
HS85-4	98	307	0.32	0.049646(0.00302)	0.205584(0.011211)	0.030028(0.000526)	189(145)	190(9)		191(3)	0.85
HS85-5	278	554	0.50	0.052706(0.001871)	0.218618(0.007578)	0.030078(0.00036)	317(81)	201(6)		191(2)	0.097
HS85-6	172	498	0.35	0.04820(0.001683)	0.199572(0.007025)	0.030024(0.000394)	109(79)	185(6)		191(2)	0.95
HS85-7	64	217	0.30	0.051373(0.002832)	0.211672(0.010994)	0.029877(0.000463)	257(132)	195(9)		190(3)	0.99
HS85-8	129	342	0.38	0.050726(0.002005)	0.209678(0.008078)	0.029973(0.000447)	228(58)	193(7)		190(3)	0.92
HS85-9	53	203	0.26	0.047191(0.002886)	0.194641(0.011236)	0.029908(0.000391)	58(141)	181(10)		190(2)	0.90
HS85-10	147	366	0.40	0.052106(0.00258)	0.216024(0.010695)	0.030063(0.000531)	300(113)	199(9)		191(3)	0.96
HS85-11	68	242	0.28	0.04904(0.002576)	0.201075(0.010676)	0.029731(0.000448)	150(156)	186(9)		189(3)	0.96
HS85-12	114	344	0.33	0.05406(0.002353)	0.224155(0.010361)	0.030068(0.000418)	372(103)	205(9)		191(3)	0.90
HS85-13	368	732	0.50	0.05511(0.001637)	0.229598(0.006954)	0.030211(0.000284)	417(67)	210(6)		192(2)	0.98
HS85-14	92	237	0.39	0.047874(0.003394)	0.195332(0.012832)	0.029587(0.000515)	100(154)	181(11)		188(3)	0.97
HS85-15	178	459	0.39	0.049037(0.002185)	0.202944(0.008467)	0.03001(0.000387)	150(104)	188(7)		191(2)	0.95

分析点号	¹⁷⁶Hf/¹⁷⁷Hf(2σ)	¹⁷⁶Lu/¹⁷⁷Hf(2σ)	¹⁷⁶Yb/¹⁷⁷Hf(2σ)	年龄 (Ma)	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)
HS84-1	0.282827(0.000018)	0.035444(0.000091)	0.00131(0.0000042)	191	5.98	608	850
HS84-2	0.282847(0.000016)	0.023351(0.000014)	0.00090(0.0000007)	190	6.71	573	803
HS84-3	0.282837(0.000014)	0.030009(0.000184)	0.00114(0.0000047)	191	6.34	591	826
HS84-4	0.282840(0.000015)	0.024463(0.000170)	0.00090(0.0000065)	191	6.48	582	817
HS84-5	0.282916(0.000018)	0.045125(0.000427)	0.00165(0.0000169)	191	9.07	485	652
HS84-6	0.282841(0.000016)	0.023863(0.000227)	0.00088(0.0000059)	190	6.50	581	816
HS84-7	0.282881(0.000017)	0.025421(0.000106)	0.00094(0.0000056)	191	7.91	526	726
HS84-8	0.282857(0.000017)	0.026894(0.000059)	0.00101(0.0000022)	190	7.05	560	780
HS84-9	0.282839(0.000016)	0.033561(0.000297)	0.00124(0.0000133)	190	6.40	589	822
HS84-10	0.282850(0.000016)	0.036102(0.000504)	0.00138(0.0000176)	192	6.78	576	799
HS84-11	0.282845(0.000016)	0.023576(0.000117)	0.00090(0.0000043)	191	6.66	576	806
HS84-12	0.282882(0.000018)	0.040274(0.000244)	0.00147(0.0000112)	191	7.92	531	726
HS84-13	0.282832(0.000017)	0.032946(0.000175)	0.00123(0.0000075)	190	6.16	598	837
HS84-14	0.282821(0.000017)	0.025838(0.000211)	0.00096(0.0000064)	190	5.79	610	861
HS84-15	0.282858(0.000015)	0.031726(0.000102)	0.00116(0.0000019)	190	7.09	560	778
HS85-1	0.282852(0.000015)	0.035941(0.000019)	0.00135(0.0000008)	191	6.83	573	795
HS85-2	0.282862(0.000014)	0.025235(0.000398)	0.00093(0.0000125)	187	7.16	552	771
HS85-3	0.282849(0.000015)	0.021763(0.000065)	0.00080(0.0000014)	194	6.86	569	795
HS85-4	0.282899(0.000017)	0.027905(0.000210)	0.00107(0.0000064)	191	8.54	502	686
HS85-5	0.282809(0.000016)	0.021743(0.000039)	0.00082(0.0000014)	191	5.39	625	887
HS85-6	0.282819(0.000016)	0.033548(0.000169)	0.00123(0.0000055)	191	5.69	618	867
HS85-7	0.282866(0.000018)	0.032393(0.000098)	0.00122(0.0000034)	190	7.35	550	761
HS85-8	0.282844(0.000019)	0.023586(0.000236)	0.00090(0.0000070)	190	6.63	576	807
HS85-9	0.282862(0.000016)	0.026947(0.000190)	0.00098(0.0000058)	190	7.24	552	768
HS85-10	0.282844(0.000015)	0.020426(0.000305)	0.00008(0.0000109)	191	6.71	565	802
HS85-11	0.282865(0.000017)	0.025375(0.000133)	0.00090(0.0000007)	189	7.33	547	762
HS85-12	0.282848(0.000016)	0.026230(0.000142)	0.00098(0.0000053)	191	6.75	573	800
HS85-13	0.282874(0.000018)	0.029777(0.000080)	0.00113(0.0000046)	192	7.67	538	742
HS85-14	0.282857(0.000017)	0.033489(0.000132)	0.00124(0.0000048)	188	6.99	563	783
HS85-15	0.282859(0.000017)	0.021200(0.000146)	0.00080(0.0000035)	191	7.16	554	774

分析点号	¹⁷⁶Hf/¹⁷⁷Hf(2σ)	¹⁷⁶Lu/¹⁷⁷Hf(2σ)	¹⁷⁶Yb/¹⁷⁷Hf(2σ)	年龄 (Ma)	ε_Hf(t)	T_DM1 (Ma)	T_DM2 (Ma)
HS84-1	0.282827(0.000018)	0.035444(0.000091)	0.00131(0.0000042)	191	5.98	608	850
HS84-2	0.282847(0.000016)	0.023351(0.000014)	0.00090(0.0000007)	190	6.71	573	803
HS84-3	0.282837(0.000014)	0.030009(0.000184)	0.00114(0.0000047)	191	6.34	591	826
HS84-4	0.282840(0.000015)	0.024463(0.000170)	0.00090(0.0000065)	191	6.48	582	817
HS84-5	0.282916(0.000018)	0.045125(0.000427)	0.00165(0.0000169)	191	9.07	485	652
HS84-6	0.282841(0.000016)	0.023863(0.000227)	0.00088(0.0000059)	190	6.50	581	816
HS84-7	0.282881(0.000017)	0.025421(0.000106)	0.00094(0.0000056)	191	7.91	526	726
HS84-8	0.282857(0.000017)	0.026894(0.000059)	0.00101(0.0000022)	190	7.05	560	780
HS84-9	0.282839(0.000016)	0.033561(0.000297)	0.00124(0.0000133)	190	6.40	589	822
HS84-10	0.282850(0.000016)	0.036102(0.000504)	0.00138(0.0000176)	192	6.78	576	799
HS84-11	0.282845(0.000016)	0.023576(0.000117)	0.00090(0.0000043)	191	6.66	576	806
HS84-12	0.282882(0.000018)	0.040274(0.000244)	0.00147(0.0000112)	191	7.92	531	726
HS84-13	0.282832(0.000017)	0.032946(0.000175)	0.00123(0.0000075)	190	6.16	598	837
HS84-14	0.282821(0.000017)	0.025838(0.000211)	0.00096(0.0000064)	190	5.79	610	861
HS84-15	0.282858(0.000015)	0.031726(0.000102)	0.00116(0.0000019)	190	7.09	560	778
HS85-1	0.282852(0.000015)	0.035941(0.000019)	0.00135(0.0000008)	191	6.83	573	795
HS85-2	0.282862(0.000014)	0.025235(0.000398)	0.00093(0.0000125)	187	7.16	552	771
HS85-3	0.282849(0.000015)	0.021763(0.000065)	0.00080(0.0000014)	194	6.86	569	795
HS85-4	0.282899(0.000017)	0.027905(0.000210)	0.00107(0.0000064)	191	8.54	502	686
HS85-5	0.282809(0.000016)	0.021743(0.000039)	0.00082(0.0000014)	191	5.39	625	887
HS85-6	0.282819(0.000016)	0.033548(0.000169)	0.00123(0.0000055)	191	5.69	618	867
HS85-7	0.282866(0.000018)	0.032393(0.000098)	0.00122(0.0000034)	190	7.35	550	761
HS85-8	0.282844(0.000019)	0.023586(0.000236)	0.00090(0.0000070)	190	6.63	576	807
HS85-9	0.282862(0.000016)	0.026947(0.000190)	0.00098(0.0000058)	190	7.24	552	768
HS85-10	0.282844(0.000015)	0.020426(0.000305)	0.00008(0.0000109)	191	6.71	565	802
HS85-11	0.282865(0.000017)	0.025375(0.000133)	0.00090(0.0000007)	189	7.33	547	762
HS85-12	0.282848(0.000016)	0.026230(0.000142)	0.00098(0.0000053)	191	6.75	573	800
HS85-13	0.282874(0.000018)	0.029777(0.000080)	0.00113(0.0000046)	192	7.67	538	742
HS85-14	0.282857(0.000017)	0.033489(0.000132)	0.00124(0.0000048)	188	6.99	563	783
HS85-15	0.282859(0.000017)	0.021200(0.000146)	0.00080(0.0000035)	191	7.16	554	774

样号	SiO₂	Al₂O₃	CaO	TFe₂O₃	K₂O	MgO	MnO	Na₂O	P₂O₅	TiO₂	烧失量	总量	里特曼指数	A/CNK	A/NK
SJ-1	69.33	15.3	0.59	3.54	4.51	0.1	0.05	4.77	0.03	0.19	1.04	99.69	3.27	1.05	1.13
SJ-2	69.50	15.24	0.6	3.42	4.58	0.09	0.06	4.69	0.03	0.18	1.09	99.64	3.24	1.05	1.13
SJ-3	68.97	15.12	1.22	3.44	4.31	0.11	0.06	4.81	0.03	0.18	1.45	100.06	3.20	0.98	1.13
SJ-4	69.48	15.42	0.52	3.50	4.57	0.10	0.05	4.60	0.03	0.19	1.17	99.61	3.18	1.09	1.16
SJ-5	69.56	15.40	0.54	3.49	4.58	0.09	0.06	4.60	0.03	0.19	1.11	99.72	3.17	1.08	1.16
SJ-6	69.49	15.32	0.52	3.6	4.33	0.09	0.06	4.83	0.05	0.19	1.04	99.78	3.17	1.07	1.14
HS84	69.52	15.32	0.53	3.61	4.42	0.10	0.05	4.84	0.03	0.19	1.22	99.91	3.23	1.06	1.13
HS85	69.53	15.45	0.50	3.71	4.46	0.11	<0.01	4.69	0.03	0.19	1.20	99.95	3.16	1.09	1.16