赣中大王山石英脉型钨钼多金属矿床成岩成矿年代学及其地质意义

doi:10.11720/wtyht.2019.1478

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Abstract

The Dawangshan tungsten-molybdenum polymetallic deposit in Jiangxi province is a typical quartz vein type deposit, lies in the Dawangshan-Yudu Cu-Mo-Au-Ag-Pb-Zn ore belt. The ore-bearing rock mass is characterized by multiple stages. According to the LA-ICPMS zircon U-Pb dating technique, the diagenetic age of fine-grained granite in the late stage is 145.1±0.89 Ma, which is close to the formation time of medium-grained granite formed in the early stage (147.8±1.9 Ma). Using the Re-Os isotope dating technique of molybdenite, the metallogenic age was 147.6±1.8 Ma. Indicating that the deposit was formed in the late Jurassic, It is consistent with the diagenesis and mineralization age of Yanshanian quartz vein type tungsten molybdenum polymetallic deposit in Nanling area. Re content of molybdenite has important reference value to indicate the source of mineralization materials. The Dawangshan tungsten-molybdenum polymetallic deposit is related with Yanshanian granites, the Re contents of molybdenite samples is 2 215×10 ^-9~10 183×10 ^-9, It is consistent with the characteristics of tungsten deposit associated molybdenum,which indicates that the ore-forming materials are likely to come from the crust or crust-mantle-derived ones. In combination with metallogenic geological background, the author infers that the Dawangshan deposit is associated with the subduction of the Paleo-Pacificocean plate beneath the Eurasian continent. It is proposed that the ore-forming materials were extracted by alkali metasomatism between the magma and the wall rock and then concentrated in the favourable areas.

Key words： molybdenite isotope dating mineralization age trace elements Dawangshan

Received: 27 December 2018 Published: 31 May 2019

:	P618.65
	P611.1

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	Qing-Kun YANG
	Xiao-Liang ZHANG
	Chen HUA
	Yu-Shuai YU
	Wan-Peng ZHOU

Cite this article:

Qing-Kun YANG,Xiao-Liang ZHANG,Chen HUA, et al. Petrogenic and metallogenic geochronology and its geological significance of the Dawangshan quartz vein type scheelite-molybdenite polymetallic deposit in central Jiangxi Province[J]. Geophysical and Geochemical Exploration, 2019, 43(3): 558-567.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1478 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I3/558

Geotectonic location map and regional geological map of Dawangshan deposit
a—tectonic position of Dawangshan deposit;b—regional geological map of Dawangshan deposit;c—geological sketch map of Dawangshan deposit

Photos of the granite and W-Mo polymetallic ore samples in Dawangshan tungsten molybdenum polymetallic ore concentration area
a—ore-bearing fine-grained granite intrudes into medium-grained granite; b—pegmatitic dikes; c—early tungsten molybdenum polymetallic ore capsule was cut by late quartz veins containing ore; d—pocket; e—sulfide ore in late quartz crystal cave; f—pyrite-chalcopyrite-wolframite-molybdenite symbiosis; g,h—wolframite-chalcopyrite-brightness molybdenum ore (reflection of single polarized light); Mlt—wolframite; Ccp—chalcopyrite; Py—pyrite; Mo—molybdenum

Zircon cathodoluminescene(CL) images for the ore-bearing granites from the Dawangshan deposit

U-Pb concordia diagram of zircons for porphyry from the Dawangshan deposit

样号	w(U) /10^-6	w(Th) /10^-6	w(Th) /w(U)	同位素比值								年龄/Ma
样号	w(U) /10^-6	w(Th) /10^-6	w(Th) /w(U)	$207 Pb 206 Pb$	1σ	$207 Pb 235 U$	1σ	$206 Pb 238 U$	1σ	$208 Pb 232 Th$	1σ	$207 Pb 206 Pb$	1σ	$207 Pb 235 U$	1σ	$206 Pb 238 U$	1σ	$208 Pb 232 Th$	1σ
DWS17-1-1	863	364	0.42	0.0502	0.00106	0.1575	0.00345	0.0228	0.00030	0.0074	0.00018	204.2	49	148.5	3	145.4	2	149.9	4
DWS17-1-2	1463	506	0.35	0.0485	0.00096	0.1528	0.00314	0.0228	0.00027	0.0080	0.00016	124.2	47	144.4	3	145.6	2	160.3	3
DWS17-1-3	331	192	0.58	0.0487	0.00200	0.1530	0.00637	0.0229	0.00039	0.0077	0.00022	135.2	97	144.6	6	146.1	2	154.6	4
DWS17-1-4	3534	900	0.25	0.0510	0.00128	0.1596	0.00572	0.0228	0.00064	0.0080	0.00025	241.3	58	150.3	5	145.3	4	160.4	5
DWS17-1-5	416	225	0.54	0.0495	0.00163	0.1542	0.00507	0.0227	0.00037	0.0087	0.00028	169.5	77	145.6	4	144.6	2	174.1	6
DWS17-1-6	235	108	0.46	0.0487	0.00163	0.1525	0.00514	0.0228	0.00032	0.0078	0.00022	132.0	79	144.1	5	145.1	2	157.9	4
DWS17-1-7	309	212	0.68	0.0485	0.00145	0.1512	0.00452	0.0227	0.00031	0.0084	0.00023	124.0	70	143.0	4	144.6	2	168.9	5
DWS17-1-8	197	100	0.51	0.0506	0.00155	0.1592	0.00508	0.0228	0.00031	0.0074	0.00027	221.6	71	150.0	4	145.5	2	149.4	5
DWS17-1-9	595	277	0.47	0.0507	0.00189	0.1587	0.00734	0.0228	0.00056	0.0072	0.00042	225.6	86	149.6	6	145.5	4	145.1	8
DWS17-1-10	543	168	0.31	0.0489	0.00148	0.1540	0.00482	0.0229	0.00036	0.0082	0.00026	144.2	71	145.5	4	146.1	2	166.0	5
DWS17-1-11	332	176	0.53	0.0490	0.00225	0.1539	0.00634	0.0230	0.00057	0.0086	0.00027	150.2	108	145.4	6	146.7	4	173.2	5
DWS17-1-12	514	235	0.46	0.0485	0.00091	0.1512	0.00308	0.0226	0.00029	0.0077	0.00015	126.1	44	143.0	3	143.8	2	155.1	3
DWS17-1-13	328	168	0.51	0.0490	0.00137	0.1558	0.00482	0.0229	0.00032	0.0084	0.00020	146.7	66	147.0	4	146.2	2	168.6	4
DWS17-1-14	687	304	0.44	0.0497	0.00129	0.1568	0.00397	0.0230	0.00034	0.0076	0.00018	182.9	61	147.9	3	146.4	2	153.6	4
DWS17-1-15	209	156	0.75	0.0486	0.00198	0.1522	0.00633	0.0229	0.00039	0.0080	0.00027	128.5	96	143.9	6	145.9	2	161.9	5
DWS17-1-16	266	140	0.53	0.0500	0.00165	0.1557	0.00493	0.0228	0.00031	0.0077	0.00020	195.9	77	146.9	4	145.2	2	154.8	4
DWS17-1-17	360	164	0.46	0.0493	0.00154	0.1518	0.00480	0.0224	0.00038	0.0082	0.00026	161.1	73	143.5	4	142.9	2	164.4	5
DWS17-1-18	187	94	0.50	0.0511	0.00231	0.1565	0.00615	0.0227	0.00064	0.0084	0.00037	246.9	104	147.6	5	144.8	4	169.0	7
DWS17-1-19	405	205	0.51	0.0506	0.00177	0.1559	0.00551	0.0224	0.00031	0.0074	0.00024	222.0	81	147.1	5	142.7	2	148.1	5
DWS17-1-20	291	183	0.63	0.0498	0.00182	0.1559	0.00550	0.0229	0.00032	0.0079	0.00022	184.2	85	147.2	5	145.9	2	159.1	4
DWS17-1-21	493	221	0.45	0.0494	0.00141	0.1537	0.00386	0.0228	0.00038	0.0079	0.00022	168.8	67	145.1	3	145.2	2	158.5	4
DWS17-1-22	379	169	0.45	0.0505	0.00156	0.1569	0.00442	0.0228	0.00036	0.0079	0.00025	218.8	72	148.0	4	145.4	2	158.4	5
DWS17-1-23	378	184	0.49	0.0486	0.00152	0.1519	0.00466	0.0228	0.00036	0.0075	0.00025	130.0	74	143.6	4	145.0	2	151.2	5
DWS17-1-24	210	107	0.51	0.0493	0.00202	0.1535	0.00635	0.0227	0.00035	0.0075	0.00027	160.7	96	145.0	6	144.6	2	151.1	5

Results of zircon LA-ICP-MS U-Pb ages for ore-bearing granites from the Dawangshan deposit

Re-Os isotopic data for molybdenite from the Dawangshan deposit

Isochron diagram and model age weighted diagram of Re-Os isotope for molybdenite form the Dawangshan deposit

The metallogenic and diagenetic ages of molybdenites and the granite from several quartz vein tungsten deposits in eastern Nanling and central Jiangxi

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