Zircon U-Pb and Molybdenite Re-Os Ages and Geological Significance of the Chaganhua Molybdenum Deposit, Urad Rear Banner, Inner Mongolia

doi:10.19657/j.geoscience.1000-8527.2020.019

Abstract

Abstract:

The Chaganhua molybdenum (Mo) polymetallic deposit is a large concealed deposit in the Baoyintu magmatic arc of North China Craton. The Mo orebody is hosted within the exo-contact between the Permian granodiorite and the two-mica quartz schist of the Baoyintu Group. The orebodies are NW-trending, and occur as irregularly-thick layers, veins,or stockworks. The wall-rock alteration styles include potassic, greisen, and chlorite, consistent with the typical porphyry-type deposit. In this study, we separated and LA-ICP-MS U-Pb dated zircons from the Mo-mineralized granodiorite from Chaganhua. Our results yielded a weighted mean ²⁰⁶Pb/²³⁸U age of (257.2±1.3) Ma (n=32, MSWD=1.6),indicating that the Chaganhua granodiorite was formed in the Late Permian.In addition, molybdenite Re-Os dating yielded an isochron age of (238.6±4.4) Ma and a model age of (240.0±1.6) Ma (n=9, MSWD=0.27),which reveals that the Chaganhua Mo mineralization was the product of the Early Indosinian magmatism.Furthermore, the Re content of molybdenite ranges from 64 502×10^-9 to 245 6 21×10^-9, suggesting that the ore-forming material was sourced from a mixture of crust and mantle.

Key words: zircon U-Pb age, Re-Os dating, Chaganhua molybdenum deposit, Urad Rear Banner, Inner Mongolia

CLC Number:

P597
P611.1

LI Guangyao, LI Zhidan, WANG Jiaying, LI Xiaoguang, LI Chao, TU Jiarun, XIE Yu, DING Ning. Zircon U-Pb and Molybdenite Re-Os Ages and Geological Significance of the Chaganhua Molybdenum Deposit, Urad Rear Banner, Inner Mongolia[J]. Geoscience, 2020, 34(03): 494-503.

Figures/Tables 12

References 44

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测点号	含量/10^-6			同位素比值				年龄/Ma
测点号	Pb	Th	U	²³²Th/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U(1σ)	²⁰⁶Pb/²³⁸U(1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U(1σ)	²⁰⁶Pb/²³⁸U (1σ)
1	58	729	1 343	0.542 5 (0.004)	0.052 2(0.000 7)	0.297 5(0.004 6)	0.041 3(0.000 4)	295 (32)	264 (4)	261 (3)
2	11	84	262	0.320 4 (0.009)	0.051 9(0.001 2)	0.298 1(0.007 2)	0.041 6(0.000 4)	283 (54)	265 (6)	263 (3)
3	46	207	1 156	0.179 6 (0.004)	0.052 2(0.000 7)	0.298 3(0.005 5)	0.041 4(0.000 5)	295 (30)	265 (5)	262 (3)
4	24	143	590	0.242 9 (0.001)	0.051 9(0.000 8)	0.295 1(0.005 1)	0.041 2(0.000 4)	281 (36)	263 (5)	260 (3)
5	15	125	369	0.339 7 (0.010)	0.053 0 (0.001 2)	0.293 3(0.008 9)	0.040 1(0.000 6)	330 (52)	261 (8)	254 (4)
6	18	103	451	0.227 3 (0.004)	0.051 7 (0.001 3)	0.294 7(0.007 2)	0.041 4(0.000 5)	270 (59)	262 (6)	261 (3)
7	103	395	2 618	0.151 0 (0.001)	0.050 3 (0.000 6)	0.286 8(0.003 9)	0.041 3(0.000 4)	210 (26)	256 (4)	261 (3)
8	32	249	786	0.316 4 (0.008)	0.052 8 (0.000 7)	0.296 0(0.005 2)	0.040 6(0.000 5)	321 (29)	263 (5)	257 (3)
9	19	224	441	0.507 4 (0.006)	0.051 2 (0.001 2)	0.289 2(0.008 9)	0.041 0(0.000 6)	249 (55)	258 (8)	259 (4)
10	13	241	295	0.815 3 (0.009)	0.051 8 (0.001 7)	0.283 9(0.010 0)	0.039 8(0.000 5)	276 (76)	254 (9)	251 (3)
11	51	529	1 283	0.412 7 (0.019)	0.053 5 (0.000 6)	0.295 3(0.003 9)	0.040 0(0.000 4)	352 (26)	263 (3)	253 (3)
12	44	407	1 102	0.369 3 (0.006)	0.051 5 (0.000 6)	0.289 8(0.004 2)	0.040 8(0.000 5)	262 (26)	258 (4)	258 (3)
13	18	289	428	0.674 9 (0.014)	0.051 5 (0.000 7)	0.295 9(0.004 3)	0.041 7(0.000 4)	263 (30)	263 (4)	263 (3)
14	89	1 721	2 081	0.826 8 (0.004)	0.053 0 (0.000 7)	0.298 7(0.005 0)	0.040 9(0.000 5)	329 (28)	265 (4)	258 (3)
15	56	522	1 403	0.372 0 (0.006)	0.051 9 (0.000 6)	0.293 1(0.004 0)	0.041 0(0.000 4)	279 (26)	261 (4)	259 (3)
16	20	215	519	0.413 6 (0.003)	0.053 3 (0.000 8)	0.290 3(0.004 8)	0.039 5(0.000 4)	342 (36)	259 (4)	250 (3)
17	23	206	585	0.351 7 (0.002)	0.053 9 (0.001 2)	0.295 9(0.007 8)	0.039 8(0.000 4)	368 (51)	263 (7)	252 (3)
18	25	296	609	0.485 4 (0.002)	0.052 8 (0.000 7)	0.294 9(0.004 6)	0.040 5(0.000 5)	320 (31)	262 (4)	256 (3)
19	144	1 835	3 449	0.532 2 (0.002)	0.052 9 (0.000 6)	0.298 5(0.004 0)	0.041 0(0.000 5)	322 (26)	265 (4)	259 (3)
20	22	189	556	0.339 8 (0.001)	0.053 9 (0.001 1)	0.298 6(0.006 6)	0.040 2(0.000 4)	366 (47)	265 (6)	254 (3)
21	18	211	434	0.485 6 (0.003)	0.052 8 (0.000 7)	0.298 4(0.004 5)	0.041 0(0.000 4)	321 (30)	265 (4)	259 (3)
22	10	113	228	0.495 8 (0.006)	0.051 4 (0.000 9)	0.288 1(0.005 4)	0.040 7(0.000 4)	257 (40)	257 (5)	257 (3)
23	20	225	485	0.462 8 (0.002)	0.053 3 (0.001 7)	0.298 0(0.009 6)	0.040 6(0.000 4)	342 (74)	265 (9)	256 (3)
24	47	487	1 120	0.434 8 (0.006)	0.052 4 (0.000 6)	0.296 1(0.005 0)	0.041 0(0.000 6)	304 (27)	263 (4)	259 (4)
25	40	448	950	0.471 6 (0.011)	0.052 7 (0.000 9)	0.294 7(0.005 1)	0.040 5(0.000 7)	318 (39)	262 (5)	256 (4)
26	44	411	1 065	0.385 9 (0.006)	0.051 7 (0.000 6)	0.293 0(0.004 7)	0.041 1(0.000 6)	272 (27)	261 (4)	260 (4)
27	22	249	528	0.471 2 (0.008)	0.053 4 (0.000 8)	0.300 0(0.004 5)	0.040 7(0.000 4)	347 (32)	266 (4)	257 (3)
28	28	649	631	1.028 0 (0.031)	0.051 7 (0.000 7)	0.288 2(0.004 5)	0.040 4(0.000 5)	274 (29)	257 (4)	255 (3)
29	86	1 277	1 921	0.664 6 (0.006)	0.052 5 (0.000 6)	0.299 1(0.004 3)	0.041 3(0.000 5)	309 (28)	266 (4)	261 (3)
30	29	689	629	1.096 4 (0.048)	0.052 5 (0.000 7)	0.288 9(0.004 4)	0.039 9(0.000 4)	306 (30)	258 (4)	252 (3)
31	30	221	756	0.291 8 (0.001)	0.052 4 (0.000 8)	0.293 8(0.005 0)	0.040 7(0.000 4)	303 (36)	262 (4)	257 (3)
32	15	169	368	0.459 5 (0.007)	0.052 9 (0.001 4)	0.293 4(0.008 6)	0.040 3(0.000 6)	323 (62)	261 (8)	254 (4)

测点号	含量/10^-6			同位素比值				年龄/Ma
测点号	Pb	Th	U	²³²Th/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U(1σ)	²⁰⁶Pb/²³⁸U(1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U(1σ)	²⁰⁶Pb/²³⁸U (1σ)
1	58	729	1 343	0.542 5 (0.004)	0.052 2(0.000 7)	0.297 5(0.004 6)	0.041 3(0.000 4)	295 (32)	264 (4)	261 (3)
2	11	84	262	0.320 4 (0.009)	0.051 9(0.001 2)	0.298 1(0.007 2)	0.041 6(0.000 4)	283 (54)	265 (6)	263 (3)
3	46	207	1 156	0.179 6 (0.004)	0.052 2(0.000 7)	0.298 3(0.005 5)	0.041 4(0.000 5)	295 (30)	265 (5)	262 (3)
4	24	143	590	0.242 9 (0.001)	0.051 9(0.000 8)	0.295 1(0.005 1)	0.041 2(0.000 4)	281 (36)	263 (5)	260 (3)
5	15	125	369	0.339 7 (0.010)	0.053 0 (0.001 2)	0.293 3(0.008 9)	0.040 1(0.000 6)	330 (52)	261 (8)	254 (4)
6	18	103	451	0.227 3 (0.004)	0.051 7 (0.001 3)	0.294 7(0.007 2)	0.041 4(0.000 5)	270 (59)	262 (6)	261 (3)
7	103	395	2 618	0.151 0 (0.001)	0.050 3 (0.000 6)	0.286 8(0.003 9)	0.041 3(0.000 4)	210 (26)	256 (4)	261 (3)
8	32	249	786	0.316 4 (0.008)	0.052 8 (0.000 7)	0.296 0(0.005 2)	0.040 6(0.000 5)	321 (29)	263 (5)	257 (3)
9	19	224	441	0.507 4 (0.006)	0.051 2 (0.001 2)	0.289 2(0.008 9)	0.041 0(0.000 6)	249 (55)	258 (8)	259 (4)
10	13	241	295	0.815 3 (0.009)	0.051 8 (0.001 7)	0.283 9(0.010 0)	0.039 8(0.000 5)	276 (76)	254 (9)	251 (3)
11	51	529	1 283	0.412 7 (0.019)	0.053 5 (0.000 6)	0.295 3(0.003 9)	0.040 0(0.000 4)	352 (26)	263 (3)	253 (3)
12	44	407	1 102	0.369 3 (0.006)	0.051 5 (0.000 6)	0.289 8(0.004 2)	0.040 8(0.000 5)	262 (26)	258 (4)	258 (3)
13	18	289	428	0.674 9 (0.014)	0.051 5 (0.000 7)	0.295 9(0.004 3)	0.041 7(0.000 4)	263 (30)	263 (4)	263 (3)
14	89	1 721	2 081	0.826 8 (0.004)	0.053 0 (0.000 7)	0.298 7(0.005 0)	0.040 9(0.000 5)	329 (28)	265 (4)	258 (3)
15	56	522	1 403	0.372 0 (0.006)	0.051 9 (0.000 6)	0.293 1(0.004 0)	0.041 0(0.000 4)	279 (26)	261 (4)	259 (3)
16	20	215	519	0.413 6 (0.003)	0.053 3 (0.000 8)	0.290 3(0.004 8)	0.039 5(0.000 4)	342 (36)	259 (4)	250 (3)
17	23	206	585	0.351 7 (0.002)	0.053 9 (0.001 2)	0.295 9(0.007 8)	0.039 8(0.000 4)	368 (51)	263 (7)	252 (3)
18	25	296	609	0.485 4 (0.002)	0.052 8 (0.000 7)	0.294 9(0.004 6)	0.040 5(0.000 5)	320 (31)	262 (4)	256 (3)
19	144	1 835	3 449	0.532 2 (0.002)	0.052 9 (0.000 6)	0.298 5(0.004 0)	0.041 0(0.000 5)	322 (26)	265 (4)	259 (3)
20	22	189	556	0.339 8 (0.001)	0.053 9 (0.001 1)	0.298 6(0.006 6)	0.040 2(0.000 4)	366 (47)	265 (6)	254 (3)
21	18	211	434	0.485 6 (0.003)	0.052 8 (0.000 7)	0.298 4(0.004 5)	0.041 0(0.000 4)	321 (30)	265 (4)	259 (3)
22	10	113	228	0.495 8 (0.006)	0.051 4 (0.000 9)	0.288 1(0.005 4)	0.040 7(0.000 4)	257 (40)	257 (5)	257 (3)
23	20	225	485	0.462 8 (0.002)	0.053 3 (0.001 7)	0.298 0(0.009 6)	0.040 6(0.000 4)	342 (74)	265 (9)	256 (3)
24	47	487	1 120	0.434 8 (0.006)	0.052 4 (0.000 6)	0.296 1(0.005 0)	0.041 0(0.000 6)	304 (27)	263 (4)	259 (4)
25	40	448	950	0.471 6 (0.011)	0.052 7 (0.000 9)	0.294 7(0.005 1)	0.040 5(0.000 7)	318 (39)	262 (5)	256 (4)
26	44	411	1 065	0.385 9 (0.006)	0.051 7 (0.000 6)	0.293 0(0.004 7)	0.041 1(0.000 6)	272 (27)	261 (4)	260 (4)
27	22	249	528	0.471 2 (0.008)	0.053 4 (0.000 8)	0.300 0(0.004 5)	0.040 7(0.000 4)	347 (32)	266 (4)	257 (3)
28	28	649	631	1.028 0 (0.031)	0.051 7 (0.000 7)	0.288 2(0.004 5)	0.040 4(0.000 5)	274 (29)	257 (4)	255 (3)
29	86	1 277	1 921	0.664 6 (0.006)	0.052 5 (0.000 6)	0.299 1(0.004 3)	0.041 3(0.000 5)	309 (28)	266 (4)	261 (3)
30	29	689	629	1.096 4 (0.048)	0.052 5 (0.000 7)	0.288 9(0.004 4)	0.039 9(0.000 4)	306 (30)	258 (4)	252 (3)
31	30	221	756	0.291 8 (0.001)	0.052 4 (0.000 8)	0.293 8(0.005 0)	0.040 7(0.000 4)	303 (36)	262 (4)	257 (3)
32	15	169	368	0.459 5 (0.007)	0.052 9 (0.001 4)	0.293 4(0.008 6)	0.040 3(0.000 6)	323 (62)	261 (8)	254 (4)

样品编号	钻孔(采样位置)	样品特征
17CH-4	CZK701-5(348.5 m)	辉钼矿与黄铁矿伴生,呈团块状、浸染状分布于石英脉中,粒径0.2~1.5 mm
17CH-7	CZK701-5(447.7 m)	辉钼矿呈浸染状分布于石英脉,粒径0.3~1.5 mm
17CH-8	CZK505(709.3 m)	辉钼矿呈浸染状分布于石英脉,粒径0.5~1.0 mm
17CH-9	CZK905-1(608.2 m)	辉钼矿呈浸染状分布于蚀变花岗岩中,粒径0.2~1.6 mm
17CH-11	CZK905-1(581.4 m)	辉钼矿呈细脉产于蚀变花岗岩中,粒径1.0~2.0 mm
17CH-13	CZK1105-1(506.2 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm
17CH-20	CZK908(320.5 m)	辉钼矿呈浸染状分布于蚀变花岗岩中,粒径0.5~1.0 mm,与黄铁矿伴生
17CH-22	CZK701-6-1(603.4 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm
17CH-23	CZK701-6-1(523.9 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm,与黄铁矿伴生

样品编号	钻孔(采样位置)	样品特征
17CH-4	CZK701-5(348.5 m)	辉钼矿与黄铁矿伴生,呈团块状、浸染状分布于石英脉中,粒径0.2~1.5 mm
17CH-7	CZK701-5(447.7 m)	辉钼矿呈浸染状分布于石英脉,粒径0.3~1.5 mm
17CH-8	CZK505(709.3 m)	辉钼矿呈浸染状分布于石英脉,粒径0.5~1.0 mm
17CH-9	CZK905-1(608.2 m)	辉钼矿呈浸染状分布于蚀变花岗岩中,粒径0.2~1.6 mm
17CH-11	CZK905-1(581.4 m)	辉钼矿呈细脉产于蚀变花岗岩中,粒径1.0~2.0 mm
17CH-13	CZK1105-1(506.2 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm
17CH-20	CZK908(320.5 m)	辉钼矿呈浸染状分布于蚀变花岗岩中,粒径0.5~1.0 mm,与黄铁矿伴生
17CH-22	CZK701-6-1(603.4 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm
17CH-23	CZK701-6-1(523.9 m)	辉钼矿呈浸染状分布于石英脉及蚀变花岗岩中,粒径0.5~1.0 mm,与黄铁矿伴生

编号	样重/g	Re(2σ)/10^-6	¹⁸⁷Os(2σ)/10^-9	模式年龄(2σ)/Ma
GBW04435 (HLP)		283.8 (6.2)	659.0 (14.4)	221.4 (5.6)
181030-23	0.005 07	289.3 (2.1)	669.2 (4.1)	220.5 (3.0)