Study on Evolution of Ore-forming Fluid in the Sadaigoumen Molybdenum Deposit, Hebei Province

doi:10.19657/j.geoscience.1000-8527.2018.03.01

Abstract

Abstract:

The Sadaigoumen Mo deposit is a typical porphyry Mo deposit in the Yan-Liao Mo(Cu) metallogenic belt on the northern margin of North China Block. Located in Fengning County, Hebei Province, the Sadaigoumen Mo deposit is the largest molybdenum deposit in this region so far. The Mo mineralization can be divided into three periods, which are pre-ore period (quartz vein stage without mineralization), the syn-ore period (including ①quartz+magnetite+molybdenite+pyrite+K-feldspar stage, ②quartz+molybdenite stage, ③quartz+mica+molybdenite+pyrite stage, and ④quartz+molybdenite+pyrite stage), and the post-ore period (late hydrothermal stage without mineralization). In order to explore the ore-forming mechanism of this Mo deposit, the study on ore fluid was carried out in this paper. There are two types of fluid inclusions in this deposit, which consist of two-phase vapor-liquid inclusions and CO₂-bearing three-phase inclusions. The quartz from the pre-ore and post-ore periods are predominantly characterized by the two-phase vapor-liquid inclusions, which have the homogenization temperatures ranging from 248 to 296 ℃, 130 to 197 ℃, and the salinities varying from 6.0% to 10.2% NaCleqv, and 0.2% to 5.9% NaCleqv for the pre-ore and post-ore periods, respectively. During the syn-ore period, the two types of fluid inclusions are both developed in quartz, with the homogenization temperatures and salinities ranging from 200 to 260 ℃, and from 7.0% to 17.5% NaCleqv. Raman spectrum and inclusion groups components studies indicate that ore fluids are mainly composed of CO₂, H₂O,N₂, Na⁺,Ca²⁺,NO₃^- and Cl^-. The δD and δ¹⁸$O_{H_{2}O}$ values for quartz from ores vary from -88‰ to -102‰, and -1.90‰ to 3.12‰, respectively. Therefore, the ore fluid in the Sadaigoumen Mo deposit is a CO₂-H₂O-NaCl system dominated by the magmatic water in a medium-low temperature and medium-low salinity.

Key words: molybdenum deposit, fluid inclusion, microthermometry, Raman spectrum, Sadaigoumen, Hebei

CLC Number:

P618.65

WU Di, JIANG Sihong, LIU Yuan, ZHANG Lili, KANG Huan, LIU Jiajun. Study on Evolution of Ore-forming Fluid in the Sadaigoumen Molybdenum Deposit, Hebei Province[J]. Geoscience, 2018, 32(03): 415-428.

Figures/Tables 16

References 27

[1]	黄凡, 陈毓川, 王登红, 等. 中国钼矿主要矿区及其资源潜力探讨[J]. 中国地质, 2011, 38(5): 1111-1134.
[2]	黄凡, 王登红, 陈毓川, 等. 中国钼矿中辉钼矿的稀土元素地球化学及其应用[J]. 中国地质, 2013, 40(1): 287-301.
[3]	代军治, 谢桂青, 段焕春, 等. 河北撒岱沟门斑岩型钼矿床成矿流体特征及其演化[J]. 岩石学报, 2007, 23(10): 2519-2529.
[4]	JIANG S H, LIANG Q L, BAGAS L. Re-Os ages for molybdenum mineralization in the Fengning region of northern Hebei Pro-vince, China: New constraints on the timing of mineralization and geodynamic setting[J]. Journal of Asian Earth Sciences, 2014, 79(1):873-883. DOI URL
[5]	张莉莉, 江思宏, 康欢, 等. 河北丰宁撒岱沟门钼矿床侵入岩Lu-Hf同位素组成[C]//中国地球物理学会.2016中国地球科学联合学术年会论文集(七)——专题15:中央造山系构造演化、专题16:华南大陆构造、专题17:中亚造山带与成矿. 北京: 中国地球物理学会, 2016:47-49.
[6]	骆文娟, 张德会, 孙剑. 河北丰宁撒岱沟门钼矿区成矿岩体地球化学特征及其对矿床成因的约束[J]. 地质与勘探, 2010, 46(3):491-505.
[7]	袁树森, 沈柳生, 柳凤娟. 河北承德地区钼矿成矿地质特征及成矿预测[J]. 黄金科学技术, 2012, 20(4):135-140.
[8]	杨丹, 徐文艺, 崔艳合, 等. 二维气相色谱法测定流体包裹体中气相成分[J]. 岩矿测试, 2007, 26(6):451-454.
[9]	刘斌, 段光贤. NaCl-H₂O溶液包裹体的密度式和等容式及其应用[J]. 矿物学报, 1987, 7(4):345-352.
[10]	李保华. 流体包裹体液相成分数据的计算机处理[J]. 成都地质学院学报, 1992, 19(4):113-117.
[11]	CLAYTON R N, O’NEIL J R, MAYEDA T K. Oxygen isotope exchange between quartz and water[J]. Journal of Geophysical Research, 1972, 77(17): 3057-3067. DOI URL
[12]	刘必政, 王建平, 王可新, 等. 陕西省双王金矿床成矿流体特征及其地质意义[J]. 现代地质, 2011, 25(6): 1088-1098.
[13]	ROEDDER E. In Physics and Chemistry of the Earth[M]. Vols.13/14.Oxford: Pergamas Press, 1979:9-35.
[14]	张德会, 刘伟. 流体包裹体成分与金矿床成矿流体来源——以河南西峡石板沟金矿床为例[J]. 地质科技情报, 1998, 17(s1):68-72.
[15]	HALL W E, FRIEDMAN I, NASH J T. Fluid inclusion and light stable isotope study of the Climax molybdenum deposits, Colorado[J]. Economic Geology, 1974, 69(6): 884-901. DOI URL
[16]	STEIN H J, HANNAH J L. Movement and origin of ore fluids in Climax-type systems[J]. Geology, 1985, 13(7):469-474. DOI URL
[17]	LINNEN R L, WILLIAMS-JONES A E. Evolution of aqueous-carbonic fluids during contact metamorphism, wall-rock alteration, and molybdenite deposition at Trout Lake, British Columbia[J]. Economic Geology, 1990, 85(8): 1840-1856. DOI URL
[18]	SELBY D, NESBITT B E, MUEHLENBACHS K, et al. Hydrothermal alteration and fluid chemistry of the Endako porphyry molybdenum deposit, British Columbia[J]. Economic Geology, 2000, 95(1): 183-202. DOI URL
[19]	ROSS P S, JÉBRAK M, WALKER B M. Discharge of hydrothermal fluids from a magma chamber and concomitant formation of a stratified breccia zone at the Questa porphyry molybdenum depo-sit, New Mexico[J]. Economic Geology, 2002, 97(8): 1679-1699. DOI URL
[20]	TAYLOR H P. The application of oxygen and hydrogen isotope studies to problems of hydrothermal alteration and ore deposition[J]. Economic Geology, 1974, 69(6): 843-883. DOI URL
[21]	付超, 王建平, 彭润民, 等. 内蒙古甲生盘铅锌硫矿床硫同位素特征及其成因意义[J]. 现代地质, 2010, 24(1): 34-41.
[22]	刘光智, 刘家军, 刘新会. 西秦岭寨上金矿床地球化学特征及成因机制研究[J]. 地质与勘探, 2009, 45(2):27-37.
[23]	OHMOTO H. Systematics of sulfur and carbon isotopes in hydrothermal ore deposits[J]. Economic Geology, 1972, 67(5):551-578. DOI URL
[24]	FARGES F, SIEWERT R, BROWN G E, et al. Structural environments around molybdenum in silicate glasses and melts. I. Influence of composition and oxygen fugacity on the local structure of molybdenum[J]. The Canadian Mineralogist, 2006, 44(3): 731-753. DOI URL
[25]	ULRICH T, MAVROGENES J. An experimental study of the solu-bility of molybdenum in H₂O and KCl-H₂O solutions from 500 ℃ to 800 ℃, and 150 to 300 MPa[J]. Geochimica et Cosmochimica Acta, 2008, 72(9): 2316-2330. DOI URL
[26]	ENGVIK A K, PUTNIS A, GERALD J D F, et al. Albitization of granitic rocks: the mechanism of replacement of oligoclase by albite[J]. The Canadian Mineralogist, 2008, 46(6): 1401-1415. DOI URL
[27]	简伟, 柳维, 石黎红. 斑岩型钼矿床研究进展[J]. 矿床地质, 2010, 29(2): 308-316.

成矿期次		包裹体类型	冰晶消失温度/℃	盐度/% NaCleqv	CO₂初熔温度/℃	CO₂笼形物消失温度/℃	CO₂相部分均一温度/℃	均一温度/℃		密度/ (g·cm^-3)
成矿期次		包裹体类型	冰晶消失温度/℃	盐度/% NaCleqv	CO₂初熔温度/℃	CO₂笼形物消失温度/℃	CO₂相部分均一温度/℃	范围	集中区间	密度/ (g·cm^-3)
成矿前		Ⅰ	-6.9~-3.4	3.6~10.2				220~300	260~300	0.99~1.10
成矿期	成矿①阶段	Ⅰ	-10.2~-3.3	2.0~14.2				189~315	240~280	0.96~1.10
	成矿②阶段	Ⅰ	-9.6~-1.2	2.1~13.5				129~317	200~240	0.96~1.10
	成矿③阶段	Ⅰ	-9.7~-0.7	1.2~13.6				169~320	200~240	0.62~0.70
	成矿③阶段	Ⅱ		0.02~5.7	-64.2~-56.9	7~10	22.2~28.2	327~365	330~350	0.21~0.29
	成矿④阶段	Ⅰ	-13.7~-0.6	1.1~17.5				178~327	180~240	0.98~1.13
	成矿④阶段	Ⅱ		0.8~14.2	-59.2~-57.6	1.2~9.6	25.8~33.2	279~343	300~340	0.72~0.83
成矿期后		Ⅰ	-3.6~-0.1	0.2~5.9				129~258	140~200	0.99~1.03

成矿期次		包裹体类型	冰晶消失温度/℃	盐度/% NaCleqv	CO₂初熔温度/℃	CO₂笼形物消失温度/℃	CO₂相部分均一温度/℃	均一温度/℃		密度/ (g·cm^-3)
成矿期次		包裹体类型	冰晶消失温度/℃	盐度/% NaCleqv	CO₂初熔温度/℃	CO₂笼形物消失温度/℃	CO₂相部分均一温度/℃	范围	集中区间	密度/ (g·cm^-3)
成矿前		Ⅰ	-6.9~-3.4	3.6~10.2				220~300	260~300	0.99~1.10
成矿期	成矿①阶段	Ⅰ	-10.2~-3.3	2.0~14.2				189~315	240~280	0.96~1.10
	成矿②阶段	Ⅰ	-9.6~-1.2	2.1~13.5				129~317	200~240	0.96~1.10
	成矿③阶段	Ⅰ	-9.7~-0.7	1.2~13.6				169~320	200~240	0.62~0.70
	成矿③阶段	Ⅱ		0.02~5.7	-64.2~-56.9	7~10	22.2~28.2	327~365	330~350	0.21~0.29
	成矿④阶段	Ⅰ	-13.7~-0.6	1.1~17.5				178~327	180~240	0.98~1.13
	成矿④阶段	Ⅱ		0.8~14.2	-59.2~-57.6	1.2~9.6	25.8~33.2	279~343	300~340	0.72~0.83
成矿期后		Ⅰ	-3.6~-0.1	0.2~5.9				129~258	140~200	0.99~1.03

成矿期次		原编号	矿物	取样温度/℃	CH₄	C₂H₂+C₂H₄	C₂H₆	CO₂	H₂O	O₂	N₂	CO
成矿前		SD16-73	石英	100~500	0.055	0.101	—	207.507	44.070	12.713	49.358	4.317
成矿前		SD16-74	石英	100~500	0.046	0.082	—	205.242	71.272	12.415	49.030	13.239
成矿期	成矿①阶段	SD16-26	石英	100~500	0.143	—	—	450.439	129.761	10.850	44.346	8.663
		SD16-63	石英	100~500	0.066	0.037	—	185.131	77.809	11.536	42.107	5.328
		SD16-100	石英	100~500	0.028	0.178	—	221.313	66.144	11.004	41.191	12.824
	成矿②阶段	SD16-195	石英	100~500	0.064	0.202	—	240.651	52.239	11.055	43.248	12.486
		SD16-256	石英	100~500	0.019	0.123	—	270.699	50.076	12.502	47.762	5.930
		SD16-257	石英	100~500	0.028	0.113	—	204.925	47.036	12.251	46.182	3.743
	成矿③阶段	SD16-16	石英	100~500	0.323	0.095	—	220.541	94.602	11.490	43.387	5.769
		SD16-56	石英	100~500	0.098	—	—	310.629	61.287	13.389	53.438	—
		SD16-89	石英	100~500	0.435	0.172	0.018	291.414	118.432	10.653	40.154	18.223
	成矿④阶段	SD16-15	石英	100~500	0.036	0.082	—	186.115	104.149	12.375	48.553	4.713
		SD16-55	石英	100~500	0.027	0.136	—	203.691	29.527	11.018	41.064	8.973
		SD16-183	石英	100~500	0.029	0.096	—	295.415	61.146	13.009	51.270	4.288
		SD16-31	石英	100~500	0.056	0.121	—	283.147	105.177	10.894	42.700	10.270
		SD16-35	石英	100~500	0.090	—	—	209.955	92.358	12.087	49.639	3.866
		SD16-57	石英	100~500	0.046	0.120	—	175.609	52.186	11.365	41.559	7.758
		SD16-64	石英	100~500	0.036	0.099	—	155.766	58.234	11.036	40.514	6.450
		SD16-196	石英	100~500	0.046	0.102	—	205.656	44.242	12.708	50.185	3.882
		SD16-261	石英	100~500	0.097	—	—	200.302	67.047	12.485	50.517	8.353
成矿期后		SD16-258	石英	100~500	0.093	—	—	218.119	46.867	12.910	49.564	13.364

成矿期次		原编号	矿物	取样温度/℃	CH₄	C₂H₂+C₂H₄	C₂H₆	CO₂	H₂O	O₂	N₂	CO
成矿前		SD16-73	石英	100~500	0.055	0.101	—	207.507	44.070	12.713	49.358	4.317
成矿前		SD16-74	石英	100~500	0.046	0.082	—	205.242	71.272	12.415	49.030	13.239
成矿期	成矿①阶段	SD16-26	石英	100~500	0.143	—	—	450.439	129.761	10.850	44.346	8.663
		SD16-63	石英	100~500	0.066	0.037	—	185.131	77.809	11.536	42.107	5.328
		SD16-100	石英	100~500	0.028	0.178	—	221.313	66.144	11.004	41.191	12.824
	成矿②阶段	SD16-195	石英	100~500	0.064	0.202	—	240.651	52.239	11.055	43.248	12.486
		SD16-256	石英	100~500	0.019	0.123	—	270.699	50.076	12.502	47.762	5.930
		SD16-257	石英	100~500	0.028	0.113	—	204.925	47.036	12.251	46.182	3.743
	成矿③阶段	SD16-16	石英	100~500	0.323	0.095	—	220.541	94.602	11.490	43.387	5.769
		SD16-56	石英	100~500	0.098	—	—	310.629	61.287	13.389	53.438	—
		SD16-89	石英	100~500	0.435	0.172	0.018	291.414	118.432	10.653	40.154	18.223
	成矿④阶段	SD16-15	石英	100~500	0.036	0.082	—	186.115	104.149	12.375	48.553	4.713
		SD16-55	石英	100~500	0.027	0.136	—	203.691	29.527	11.018	41.064	8.973
		SD16-183	石英	100~500	0.029	0.096	—	295.415	61.146	13.009	51.270	4.288
		SD16-31	石英	100~500	0.056	0.121	—	283.147	105.177	10.894	42.700	10.270
		SD16-35	石英	100~500	0.090	—	—	209.955	92.358	12.087	49.639	3.866
		SD16-57	石英	100~500	0.046	0.120	—	175.609	52.186	11.365	41.559	7.758
		SD16-64	石英	100~500	0.036	0.099	—	155.766	58.234	11.036	40.514	6.450
		SD16-196	石英	100~500	0.046	0.102	—	205.656	44.242	12.708	50.185	3.882
		SD16-261	石英	100~500	0.097	—	—	200.302	67.047	12.485	50.517	8.353
成矿期后		SD16-258	石英	100~500	0.093	—	—	218.119	46.867	12.910	49.564	13.364

成矿期次		原编号	矿物	Na⁺	K⁺	Mg²⁺	Ca²⁺	F^-	Cl^-	NO₂^-	Br^-	NO₃^-	SO₄^2-	Na⁺/ K⁺	F^-/ Cl^-
成矿前		SD16-73	石英	3.555	—	0.987	6.223	0.200	0.867	0.941	—	0.207	0.300		0.23
成矿前		SD16-74	石英	4.053	1.824	1.070	4.510	0.113	1.010	0.475	—	0.095	0.648	0.45	0.11
成矿期	成矿①阶段	SD16-26	石英	3.532	—	3.395	24.895	—	0.964	—	0.079	0.058	0.331		0.00
		SD16-63	石英	3.960	—	2.231	21.484	0.028	2.189	0.135	—	0.170	1.020		0.01
		SD16-100	石英	3.732	1.738	1.191	10.782	0.298	1.385	—	—	0.042	0.499	2.15	0.22
	成矿②阶段	SD16-195	石英	2.560	1.385	3.379	12.175	0.077	1.209	—	—	0.066	0.555	1.85	0.06
		SD16-256	石英	3.490	2.653	8.083	16.315	0.149	4.426	0.267	—	1.134	5.288	1.32	0.03
		SD16-257	石英	4.955	2.358	2.694	7.537	0.067	0.440	0.030	—	0.082	0.246	2.10	0.15
	成矿③阶段	SD16-16	石英	5.324	—	2.786	6.361	0.124	0.927	0.138	—	0.062	—		0.13
		SD16-56	石英	4.923	3.944	1.985	8.206	0.394	1.132	0.420	—	0.089	0.216	1.25	0.35
		SD16-89	石英	4.785	1.832	2.921	5.248	0.072	0.411	0.378	0.098	0.072	0.072	2.61	0.18
	成矿④阶段	SD16-15	石英	3.180	—	2.055	7.042	0.118	1.137	0.468	—	0.166	1.066		0.10
		SD16-55	石英	3.261	2.254	1.917	8.459	0.310	1.027	0.586	—	0.159	2.282	1.45	0.30
		SD16-183	石英	3.819	3.880	2.584	4.490	0.190	1.390	0.814	—	0.217	0.366	0.98	0.14
		SD16-31	石英	4.044	2.001	2.098	4.821	0.268	1.210	0.901	—	0.124	0.928	2.02	0.22
		SD16-35	石英	3.837	2.893	1.902	4.992	0.156	0.564	0.829	—	0.258	1.032	1.33	0.28
		SD16-57	石英	3.243	2.699	1.716	5.752	0.210	0.622	0.400	—	0.151	2.941	1.20	0.34
		SD16-64	石英	2.763	2.476	2.693	4.522	0.441	0.806	0.397	—	0.301	1.151	1.12	0.55
		SD16-196	石英	2.421	2.601	1.493	5.717	0.733	0.994	0.255	—	0.195	1.270	0.93	0.74
		SD16-261	石英	3.023	2.685	3.155	7.636	0.132	0.040	0.746	—	0.407	2.037	1.13	3.30
成矿期后		SD16-258	石英	3.157	1.874	1.108	15.274	3.829	0.584	0.678	—	0.134	0.981	1.68	6.5