伊朗马斯杰德达吉(Masjed Daghi)始新世斑岩成因:来自光谱学与U-Pb年代学和地球化学的证据

doi:10.19657/j.geoscience.1000-8527.2020.105

摘要/Abstract

摘要：

伊朗马斯杰德达吉(Masjed Daghi)斑岩型矿床位于阿哈尔—乔勒法(Ahar-Julfa)/阿拉斯巴兰(Arasbaran)成矿带的西北部,目前针对该斑岩矿床的研究相对较少,许多地质问题有待解决。为了补充马斯杰德达吉斑岩型矿床成因的地球化学证据,更好地厘定斑岩形成时间,了解矿床形成过程,对矿区中钻孔采集的石英二长斑岩中的长石、石英和锆石等矿物进行了红外-拉曼光谱、同位素及U-Pb定年、主量和微量元素等测试,同时对斑岩全岩主微量元素进行了分析测试。光谱学测试结果显示斑岩样品中的长石斑晶主要为斜长石,少量为钾长石。锆石U-Pb定年结果显示其成岩年龄为(54.1±1.5) Ma (MSWD=0.48),属早始新世,为矿前斑岩。岩体内发育的斜长石具有较低的K₂O(0.2%~1.8%)、较高的CaO(1.7%~8.7%)和Na₂O(6.5%~9.7%)。这些斑岩中的长石具有相对过量的Al,反映了成岩岩浆具有较高的水含量。锆石Ce⁴⁺ / Ce³⁺比值为152~543,平均330,指示较高的氧逸度。斑岩SiO₂含量高达63.4%,含有相对较高的K₂O(4.9%)和Sr/Y值(120.0~121.6),显示为具有埃达克特征的钾玄质石英二长斑岩。锆石ε_Hf(t)值为+4.5~+13.5,平均值+10.3,为正异常。另外,二阶段模型年龄(T_DM=841~260 Ma)表明岩浆起源于亏损地幔物质。马斯杰德达吉始新世斑岩形成于碰撞前大洋俯冲环境,更可能来自基性岩浆,因经历了俯冲洋壳脱水和地幔楔部分熔融的过程,而具有高氧化和富水的特征。

关键词: 马斯杰德达吉, 斑岩型矿床, 长石, 锆石, 电子探针, U-Pb定年

Abstract:

The Ahar-Julfa/Arasbaran metallogenic belt is located in the Urmieh-Dokhtar magmatic Arc of the central part of the Tethyan metallogenic belt. The Masjed Daghi porphyry deposit in Iran is located in the northwestern part of the Ahar-Julfa metallogenic belt, in which the porphyry deposits have not been sufficiently studied. This paper is based on the Eocene porphyry from the Masjed Daghi porphyry deposit, with the aim to deepen the understanding on the metallogenic background and magmatic environment of the Ahar-Julfa metallogenic belt. We used infrared spectroscopy, raman spectroscopy, electron probe microscopic analyzer (EPMA), whole-rock major- and trace-element analyses, and zircon trace element and U-Pb-Lu-Hf isotope analyses to clarify the formation setting, oxygen fugacity, water content and other characteristics of the ore-forming magma. Zircon U-Pb dating of the porphyry yielded Eocene (54.1±1.5 Ma) age and positive ε_Hf(t) ratios (+4.5 to +13.5), with T_DM ages of 260 to 841 Ma. The rocks have high K₂O (4.9%) and Sr (120×10^-6-122×10^-6) but low Y (5×10^-6) contents. In addition, the porphyries have high zircon Ce⁴⁺/Ce³⁺ ratios (152-543), and their plagioclase has high Al content. Such evidence indicates that the Eocene Masjed Daghi porphyries have water-rich and high-O fugacity features, and were generated from mafic magma upwelling during subduction.

Key words: Masjed Daghi, porphyry deposit, feldspar, zircon, EPMA, U-Pb dating

中图分类号:

P59
P581

寇冠玉, 周晔, 郑远川, 于佳兴. 伊朗马斯杰德达吉(Masjed Daghi)始新世斑岩成因:来自光谱学与U-Pb年代学和地球化学的证据[J]. 现代地质, 2021, 35(02): 535-551.

KOU Guanyu, ZHOU Ye, ZHENG Yuanchuan, YU Jiaxing. Genesis of Eocene Porphyry in Masjed Daghi, Iran: Evidence from Spectrographic, U-Pb Dating and Geochemical Characteristics[J]. Geoscience, 2021, 35(02): 535-551.

图/表 18

图1 伊朗地质简图(据Richrda等[14]修改)

Fig.1 Schematic geologic map of Iran(modified after Richrda et al.[14])

图2 马斯杰德达吉区域地质简图(据Akbarpour等[37]修改)

Fig.2 Geologic map of Masjed Daghi deposit(modified after Akbarpour et al.[37])

表1 伊朗代表性斑岩型矿床概况及其成矿年龄

Table 1 Characteristics of major Iranian porphyry deposits and their ages

矿区	成矿带	吨位 /Mt	品味	围岩	含矿斑岩	成矿类型	矿产	年龄/Ma	参考文献
马斯杰德达吉 (Masjed Daghi)	阿哈尔— 乔勒法 (Ahar-Jolfa) 斑岩成矿带	340	0.27%Cu, 0.006%Mo, 0.32×10^-6Au (20 Mt金矿体)	始新世安山岩、火山碎屑岩	二长闪长岩	脉状,散布状	Cu+Mo+ Au	20.46± 3.55	^[26]
松贡 (Sungun)	阿哈尔— 乔勒法斑岩成矿带	850	0.62% Cu, 0.01% Mo	白垩纪沉积物、始新世火山岩	二长岩-石英二长岩, 花岗闪长岩	脉状,散布状, 矽卡岩	Cu+Mo	21	^[27]
萨尔切什梅 (Sar Cheshmeh)	克尔曼 (Kerman) 斑岩成矿带	1 200	0.6% Cu, 0.02% Mo	始新世安山岩、玄武岩、火山碎屑岩	花岗闪长岩	脉状,散布状	Cu+Mo	7~13	^[28-29]
梅杜克 (Meiduk)	克尔曼斑岩成矿带	500	0.8% Cu, 0.007% Mo	始新世安山岩、玄武岩、火山碎屑岩	花岗闪长岩	脉状,散布状	Cu+Mo	9~12	^[28, 30-31]

图3 马斯杰德达吉斑岩样品的岩相学特征(手标本及显微照片) (a)钻孔斑岩样品(MAD-13-483)照片,存在大量明显的长石斑晶,可见石英和黄铁矿;(b)岩石薄片的单偏光显微照片,可见长石和角闪石斑晶;(c)岩石薄片的正交偏光显微照片,可见石英和大量长石斑晶;Kfs. 钾长石; Pl. 斜长石; Py. 黄铁矿; Qtz. 石英; Am. 角闪石

Fig.3 Petrographic characteristics of the Masjed Daghi porphyry sample(hand specimen and thin-section micrographs)

图4 马斯杰德达吉斑岩(MAD-13-483)锆石阴极发光图像

Fig.4 Cathodoluminescence images of zircons from the Masjed Daghi porphyry sample (MAD-13-483)

图5 马斯杰德达吉斑岩(MAD-13-483)矿物红外光谱

Fig.5 Infrared spectra of minerals from the Masjed Daghi porphyry sample (MAD-13-483)

图6 马斯杰德达吉斑岩(MAD-13-483)矿物拉曼光谱

Fig.6 Raman spectra of minerals from the Masjed Daghi porphyry sample (MAD-13-483)

表2 马斯杰德达吉斑岩(MAD-13-483)锆石LA-ICP-MS U-Pb年龄分析结果

Table 2 LA-ICP-MS zircon U-Pb data of the Masjed Daghi porphyry sample (MAD-13-483)

编号	含量/10^-6			同位素比值			年龄/Ma
编号	Th	U	Pb	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)
1	75.40	153.40	1.91	0.194 8(0.030 5)	0.207 8(0.029 0)	0.008 7(0.000 5)	2 783.65(259.26)	191.70(24.37)	56.16(3.37)
2	68.81	171.28	1.98	0.187 4(0.049 7)	0.184 5(0.039 0)	0.008 1(0.000 3)	2 720.38(451.70)	171.89(33.43)	52.30(1.92)
3	69.74	135.25	1.76	0.293 1(0.064 7)	0.327 9(0.071 2)	0.008 6(0.000 4)	3 434.27(349.00)	287.94(54.50)	55.33(2.25)
4	76.72	249.94	3.35	0.235 8(0.071 6)	0.344 1(0.124 7)	0.009 8(0.001 0)	3 091.67(504.76)	300.31(94.44)	63.14(6.53)
5	146.88	348.51	3.77	0.069 5(0.005 5)	0.079 8(0.006 4)	0.008 7(0.000 3)	922.22(195.37)	78.00(6.01)	55.90(1.78)
6	94.40	172.80	2.76	0.240 8(0.036 7)	0.292 2(0.034 0)	0.010 0(0.000 7)	3 125.01(245.07)	260.33(26.74)	63.85(4.29)
7	140.27	215.30	2.34	0.179 8(0.048 1)	0.196 7(0.066 2)	0.007 8(0.000 3)	2 650.31(458.34)	182.37(56.21)	50.23(2.09)
8	96.24	170.61	1.83	0.010 8(0.015 2)	0.012 2(0.015 9)	0.008 4(0.000 3)	-	12.33(15.91)	53.91(1.93)
9	293.68	538.35	5.80	0.059 9(0.010 4)	0.068 9(0.011 9)	0.008 2(0.000 3)	611.13(381.44)	67.69(11.33)	52.87(2.08)
10	121.63	318.14	5.06	0.206 5(0.071 8)	0.250 4(0.077 3)	0.009 4(0.000 4)	2 878.7(596.43)	226.92(62.83)	60.06(2.43)
11	146.05	368.76	3.64	0.148 1(0.060 6)	0.140 4(0.049 9)	0.007 9(0.000 2)	2 324.39(761.88)	133.44(44.44)	50.92(1.55)
12	119.76	263.15	2.83	0.080 8(0.006 3)	0.097 0(0.009 0)	0.008 4(0.000 3)	1 216.67(155.09)	93.96(8.37)	54.09(2.05)
13	79.83	163.51	1.70	0.246 7(0.041 0)	0.242 9(0.035 5)	0.008 3(0.000 3)	3 164.82(266.67)	220.76(28.99)	53.01(2.12)
14	113.20	331.29	3.34	0.095 5(0.012 7)	0.103 4(0.011 1)	0.008 8(0.000 5)	1 536.73(251.85)	99.89(10.23)	56.37(3.35)
15	133.43	282.62	3.01	0.100 5(0.016 6)	0.106 5(0.015 0)	0.008 5(0.000 4)	1 633.02(311.11)	102.80(13.81)	54.35(2.27)

表2 马斯杰德达吉斑岩(MAD-13-483)锆石LA-ICP-MS U-Pb年龄分析结果

Table 2 LA-ICP-MS zircon U-Pb data of the Masjed Daghi porphyry sample (MAD-13-483)

编号	含量/10^-6			同位素比值			年龄/Ma
编号	Th	U	Pb	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)	²⁰⁷Pb/²⁰⁶Pb (1σ)	²⁰⁷Pb/²³⁵U (1σ)	²⁰⁶Pb/²³⁸U (1σ)
1	75.40	153.40	1.91	0.194 8(0.030 5)	0.207 8(0.029 0)	0.008 7(0.000 5)	2 783.65(259.26)	191.70(24.37)	56.16(3.37)
2	68.81	171.28	1.98	0.187 4(0.049 7)	0.184 5(0.039 0)	0.008 1(0.000 3)	2 720.38(451.70)	171.89(33.43)	52.30(1.92)
3	69.74	135.25	1.76	0.293 1(0.064 7)	0.327 9(0.071 2)	0.008 6(0.000 4)	3 434.27(349.00)	287.94(54.50)	55.33(2.25)
4	76.72	249.94	3.35	0.235 8(0.071 6)	0.344 1(0.124 7)	0.009 8(0.001 0)	3 091.67(504.76)	300.31(94.44)	63.14(6.53)
5	146.88	348.51	3.77	0.069 5(0.005 5)	0.079 8(0.006 4)	0.008 7(0.000 3)	922.22(195.37)	78.00(6.01)	55.90(1.78)
6	94.40	172.80	2.76	0.240 8(0.036 7)	0.292 2(0.034 0)	0.010 0(0.000 7)	3 125.01(245.07)	260.33(26.74)	63.85(4.29)
7	140.27	215.30	2.34	0.179 8(0.048 1)	0.196 7(0.066 2)	0.007 8(0.000 3)	2 650.31(458.34)	182.37(56.21)	50.23(2.09)
8	96.24	170.61	1.83	0.010 8(0.015 2)	0.012 2(0.015 9)	0.008 4(0.000 3)	-	12.33(15.91)	53.91(1.93)
9	293.68	538.35	5.80	0.059 9(0.010 4)	0.068 9(0.011 9)	0.008 2(0.000 3)	611.13(381.44)	67.69(11.33)	52.87(2.08)
10	121.63	318.14	5.06	0.206 5(0.071 8)	0.250 4(0.077 3)	0.009 4(0.000 4)	2 878.7(596.43)	226.92(62.83)	60.06(2.43)
11	146.05	368.76	3.64	0.148 1(0.060 6)	0.140 4(0.049 9)	0.007 9(0.000 2)	2 324.39(761.88)	133.44(44.44)	50.92(1.55)
12	119.76	263.15	2.83	0.080 8(0.006 3)	0.097 0(0.009 0)	0.008 4(0.000 3)	1 216.67(155.09)	93.96(8.37)	54.09(2.05)
13	79.83	163.51	1.70	0.246 7(0.041 0)	0.242 9(0.035 5)	0.008 3(0.000 3)	3 164.82(266.67)	220.76(28.99)	53.01(2.12)
14	113.20	331.29	3.34	0.095 5(0.012 7)	0.103 4(0.011 1)	0.008 8(0.000 5)	1 536.73(251.85)	99.89(10.23)	56.37(3.35)
15	133.43	282.62	3.01	0.100 5(0.016 6)	0.106 5(0.015 0)	0.008 5(0.000 4)	1 633.02(311.11)	102.80(13.81)	54.35(2.27)

图7 马斯杰德达吉斑岩(MAD-13-483)锆石U-Pb谐和年龄(a)和加权平均年龄(b)

Fig.7 Zircon U-Pb concordia plot (a) and weighted-mean age plot(b) of the Masjed Daghi porphyry sample (MAD-13-483)

表3 马斯杰德达吉斑岩(MAD-13-483)长石的主量元素(%)分析结果

Table 3 Representative EPMA major element compositions (%) of feldspars from the Masjed Daghi porphyry sample (MAD-13-483)

点号	SiO₂	TiO₂	Al₂O₃	FeO	MnO	MgO	CaO	Na₂O	K₂O	F	Cl	Cr₂O₃	P₂O₅	Al/(Ca+ Na+K)	K₂O+ Na₂O+CaO	An	Ab	Or
pl-1	60.13	0.020	24.47	0.168	0.019	-	5.926	8.322	0.264	0.092	-	-	0.007	1.26	14.512	27.82	70.70	1.47
pl-2	59.39	-	25.75	0.203	0.027	0.008	7.112	7.598	0.189	0.050	-	-	0.011	1.34	14.899	33.72	65.20	1.06
pl-3	59.86	0.025	24.82	0.336	0.034	-	6.706	7.961	0.253	-	-	0.005	0.022	1.27	14.920	31.31	67.27	1.40
pl-4	60.12	0.048	24.82	0.149	0.034	-	6.491	8.185	0.277	0.078	0.001	-	0.019	1.26	14.953	30.00	68.46	1.52
pl-5	60.03	-	24.49	0.133	-	0.024	6.349	7.803	0.270	-	0.006	-	-	1.29	14.422	30.53	67.91	1.54
pl2-1	58.20	-	25.78	0.140	-	-	7.565	7.453	0.186	-	0.002	-	0.011	1.33	15.204	35.56	63.39	1.04
pl2-2	58.65	0.048	25.21	0.155	0.050	-	7.047	7.563	0.224	0.050	0.003	-	0.022	1.32	14.834	33.55	65.17	1.26
pl2-3	57.07	0.002	26.57	0.102	0.053	0.006	8.688	6.746	0.186	-	-	-	-	1.38	15.620	41.14	57.80	1.04
pl2-4	58.74	0.041	25.95	0.193	-	0.006	7.778	7.369	0.172	0.100	-	0.037	-	1.33	15.319	36.48	62.55	0.96
pl2-5	63.46	-	22.51	0.073	-	-	3.711	9.676	0.335	-	-	-	0.019	1.14	13.722	17.16	80.99	1.84
pl3-1	56.98	-	26.76	0.235	0.011	-	8.552	6.855	0.178	-	0.006	-	-	1.39	15.585	40.39	58.59	1.00
pl3-2	55.45	0.016	25.47	0.082	0.034	0.041	7.649	7.179	0.184	0.036	0.011	-	0.019	1.34	15.012	36.66	62.28	1.05
pl3-3	55.74	0.005	26.26	0.133	0.023	0.243	7.638	6.516	0.729	-	0.007	-	0.015	1.42	14.883	37.63	58.09	4.27
pl3-4	57.19	0.014	25.88	0.101	0.019	0.103	7.080	6.841	0.482	-	0.008	-	-	1.42	14.403	35.34	61.79	2.86
pl3-5	64.91	-	22.01	0.086	0.030	0.061	1.655	9.476	1.787	0.035	-	0.057	-	1.15	12.918	7.90	81.92	10.16

图8 马斯杰德达吉斑岩(MAD-13-483)长石分类(单位为%,据Deer等[43]修改)

Fig.8 Classification of feldspars from the Masjed Daghi porphyry sample (MAD-13-483)(modified after Deer et al.[43])

图9 长石SiO2-(CaO+Na2O+K2O)图(a)和An-Al/(Ca+Na+K) 图(b)(据Zarasvandi等[44]修改)

Fig.9 SiO2 vs.(CaO+Na2O+K2O) (a), and An vs. Al / (Ca+Na+K) (b) diagrams of feldspars from the Masjed Daghi porphyry sample (MAD-13-483) (modified after Zarasvandi et al.[44])

表4 马斯杰德达吉斑岩(MAD-13-483)石英的主量(%)元素分析结果

Table 4 Representative EPMA major element compositions (%) of quartz from the Masjed Daghi porphyry sample (MAD-13-483)

编号	SiO₂	Na₂O	K₂O	Cr₂O₃	Al₂O₃	MgO	CaO	MnO	P₂O₅	FeO	TiO₂	NiO	总量
1	98.284	0.014	0.014	-	-	0.002	0.008	0.036	-	0.004	0.009	0.027	98.398
2	99.230	0.026	0.004	0.018	0.021	-	0.008	-	-	-	-	0.035	99.342
3	98.447	0.029	0.018	0.023	0.009	-	0.010	-	-	0.046	-	-	98.582
4	98.328	0.066	0.016	0.551	0.036	0.018	0.025	0.031	-	-	-	-	99.071
5	99.503	0.021	0.009	-	0.030	-	0.023	-	-	-	0.005	0.069	99.660
6	99.292	0.008	-	0.005	0.02	-	0.013	-	0.019	-	0.007	-	99.364
7	98.809	-	-	0.005	0.021	-	-	-	0.010	0.031	0.020	0.017	98.913
8	99.059	0.015	0.007	-	0.054	0.011	-	-	-	-	0.060	0.007	99.213
9	98.805	0.005	-	-	-	-	0.017	0.014	0.001	0.023	0.017	0.017	98.899
10	98.965	0.003	-	0.041	0.071	-	0.010	-	0.033	-	0.061	-	99.184

表5 马斯杰德达吉斑岩(MAD-13-483)锆石主量(%)和微量(10-6)元素分析结果

Table 5 Representative zircon major (%) and trace element (10-6) compositions of the Masjed Daghi porphyry sample (MAD-13-483)

编号	ZrO₂	Ce	Lu	Hf	Ce⁴⁺/Ce³⁺
1	94.81	8.11	46.06	9 356.71	217.45
2	91.12	7.79	39.15	8 914.20	197.24
3	91.85	8.05	43.98	8 085.89	152.12
4	89.97	15.67	57.84	9 701.81	543.19
5	91.74	16.01	36.09	9 968.56	433.31
6	93.38	10.37	47.34	9 335.95	471.77
7	90.77	11.96	41.65	8 920.27	247.08
8	90.30	14.09	33.20	8 615.26	496.12
9	94.94	31.78	103.09	10 190.34	252.40
10	91.64	14.42	60.42	9 956.50	205.69
11	90.89	15.00	49.37	9 846.30	481.46
12	91.52	12.52	44.18	10 053.70	324.96
13	89.70	10.29	37.67	9 252.59	259.83
14	88.98	13.53	71.74	9 965.00	469.19
15	94.64	15.40	58.59	9 799.83	204.75

表6 马斯杰德达吉斑岩(MAD-13-483)全岩主量(%)和微量(10-6)元素分析结果

Table 6 Whole-rock major (%) and trace element (10-6) compositions of the porphyry sample(MAD-13-483)

SiO₂	TiO₂	Al₂O₃	Fe₂O₃	MnO	MgO	CaO	Na₂O	K₂O
63.44	0.37	14.39	1.73	0.02	2.18	3.43	3.81	4.85
P₂O₅	LOI	SUM	Na+K	Li	Be	Sc	V	Cr
0.07	4.49	98.78	8.66	11.09	0.85	7.95	84.74	15.88
Co	Ni	Cu	Zn	Ga	Rb	Sr	Y	Zr
4.91	9.97	1 957.96	61.28	14.64	111.64	702.24	5.81	106.83
Nb	Sn	Cs	Ba	La	Ce	Pr	Nd	Sm
8.06	0.85	1.78	1 177.61	25.54	40.11	3.88	12.71	1.99
Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
0.66	1.37	0.18	1.05	0.19	0.59	0.09	0.58	0.09
Hf	Ta	Pb	Th	U	Sr/Y
2.67	0.46	32.99	9.78	1.83	120.78

图10 马斯杰德达吉斑岩(MAD-13-483)TAS分类图解(a)、SiO2-K2O关系图(b)和Y-Sr/Y关系图(c)((a)据Middlemost[46]修改,(b)据Peccerillo和Taylor[47]修改,(c)据Defant等[48]修改)

Fig.10 TAS (a), SiO2 vs. K2O (b), and Y vs. Sr/Y(c)classification diagrams of the porphyry sample (MAO-13-483)((a)modified after Middle-most[46], (b) modified after Peccerillo and Taylor [47],(c) modified after Defant et al.[48])

图11 马斯杰德达吉斑岩(MAD-13-483)锆石t-εHf(t)图(a)和εHf(t)频率图(b)

Fig.11 Zircon U-Pb age vs. εHf(t) isotope data of the Masjed Daghi porphyry(MAD-13-483)(a) and εHf(t) histogram (b)

表7 马斯杰德达吉斑岩(MAD-13-483)锆石Lu-Hf同位素分析结果

Table 7 Zircon Lu-Hf isotope data of the Masjed Daghi porphyry sample (MAD-13-483)

编号	年龄/Ma	¹⁷⁶Hf/¹⁷⁷Hf(2σ)	¹⁷⁶Lu/¹⁷⁷Hf(2σ)	ε_Hf(t)	T_DM/Ma	$T D M 2$ /Ma
1	56.16	0.283 02(0.000 02)	0.000 82(0.000 02)	9.95	327.79	492.38
2	52.30	0.283 05(0.000 04)	0.000 86(0.000 01)	10.90	286.45	427.92
3	55.33	0.283 03(0.000 03)	0.000 67(0.000 04)	10.39	308.30	463.22
4	63.14	0.283 02(0.000 02)	0.001 15(0.000 02)	10.16	327.80	484.47
5	55.90	0.282 99(0.000 02)	0.000 98(0.000 01)	8.87	372.20	561.78
6	63.85	0.283 02(0.000 02)	0.000 86(0.000 01)	10.31	320.33	475.28
7	50.23	0.283 07(0.000 02)	0.000 76(0.000 01)	11.72	251.33	373.71
8	53.91	0.283 02(0.000 02)	0.000 79(0.000 03)	9.80	331.75	500.52
9	52.87	0.282 87(0.000 07)	0.001 53(0.000 02)	4.47	553.33	841.47
10	60.06	0.282 98(0.000 07)	0.000 84(0.000 01)	8.52	388.31	586.92
11	50.92	0.283 12(0.000 02)	0.000 94(0.000 01)	13.50	181.36	259.74
12	54.09	0.283 03(0.000 02)	0.001 06(0.000 02)	10.44	308.08	459.43
13	53.01	0.283 03(0.000 02)	0.000 94(0.000 01)	10.42	307.13	459.82
14	56.37	0.283 03(0.000 02)	0.000 90(0.000 01)	10.41	310.16	463.05
15	54.35	0.283 04(0.000 03)	0.000 83(0.000 01)	10.61	299.63	448.19
16	54.00	0.283 05(0.000 03)	0.000 62(0.000 04)	11.13	277.45	414.72
17	54.00	0.282 99(0.000 03)	0.000 90(0.000 03)	8.70	376.72	571.12
18	54.00	0.283 04(0.000 03)	0.001 23(0.000 02)	10.49	307.20	456.16
19	54.00	0.283 04(0.000 03)	0.000 56(0.000 01)	10.53	300.85	453.21
20	54.00	0.283 06(0.000 03)	0.000 65(0.000 01)	11.29	271.31	404.56
21	54.00	0.283 07(0.000 03)	0.000 84(0.000 01)	11.56	261.58	387.17
22	54.00	0.283 06(0.000 02)	0.000 91(0.000 02)	11.43	266.99	395.22
23	54.00	0.283 06(0.000 02)	0.000 98(0.000 01)	11.29	272.91	404.11
24	54.00	0.283 01(0.000 02)	0.001 38(0.000 01)	9.69	340.61	507.45
25	54.00	0.283 03(0.000 02)	0.001 07(0.000 01)	10.21	317.06	473.68

表7 马斯杰德达吉斑岩(MAD-13-483)锆石Lu-Hf同位素分析结果

Table 7 Zircon Lu-Hf isotope data of the Masjed Daghi porphyry sample (MAD-13-483)

编号	年龄/Ma	¹⁷⁶Hf/¹⁷⁷Hf(2σ)	¹⁷⁶Lu/¹⁷⁷Hf(2σ)	ε_Hf(t)	T_DM/Ma	$T D M 2$ /Ma
1	56.16	0.283 02(0.000 02)	0.000 82(0.000 02)	9.95	327.79	492.38
2	52.30	0.283 05(0.000 04)	0.000 86(0.000 01)	10.90	286.45	427.92
3	55.33	0.283 03(0.000 03)	0.000 67(0.000 04)	10.39	308.30	463.22
4	63.14	0.283 02(0.000 02)	0.001 15(0.000 02)	10.16	327.80	484.47
5	55.90	0.282 99(0.000 02)	0.000 98(0.000 01)	8.87	372.20	561.78
6	63.85	0.283 02(0.000 02)	0.000 86(0.000 01)	10.31	320.33	475.28
7	50.23	0.283 07(0.000 02)	0.000 76(0.000 01)	11.72	251.33	373.71
8	53.91	0.283 02(0.000 02)	0.000 79(0.000 03)	9.80	331.75	500.52
9	52.87	0.282 87(0.000 07)	0.001 53(0.000 02)	4.47	553.33	841.47
10	60.06	0.282 98(0.000 07)	0.000 84(0.000 01)	8.52	388.31	586.92
11	50.92	0.283 12(0.000 02)	0.000 94(0.000 01)	13.50	181.36	259.74
12	54.09	0.283 03(0.000 02)	0.001 06(0.000 02)	10.44	308.08	459.43
13	53.01	0.283 03(0.000 02)	0.000 94(0.000 01)	10.42	307.13	459.82
14	56.37	0.283 03(0.000 02)	0.000 90(0.000 01)	10.41	310.16	463.05
15	54.35	0.283 04(0.000 03)	0.000 83(0.000 01)	10.61	299.63	448.19
16	54.00	0.283 05(0.000 03)	0.000 62(0.000 04)	11.13	277.45	414.72
17	54.00	0.282 99(0.000 03)	0.000 90(0.000 03)	8.70	376.72	571.12
18	54.00	0.283 04(0.000 03)	0.001 23(0.000 02)	10.49	307.20	456.16
19	54.00	0.283 04(0.000 03)	0.000 56(0.000 01)	10.53	300.85	453.21
20	54.00	0.283 06(0.000 03)	0.000 65(0.000 01)	11.29	271.31	404.56
21	54.00	0.283 07(0.000 03)	0.000 84(0.000 01)	11.56	261.58	387.17
22	54.00	0.283 06(0.000 02)	0.000 91(0.000 02)	11.43	266.99	395.22
23	54.00	0.283 06(0.000 02)	0.000 98(0.000 01)	11.29	272.91	404.11
24	54.00	0.283 01(0.000 02)	0.001 38(0.000 01)	9.69	340.61	507.45
25	54.00	0.283 03(0.000 02)	0.001 07(0.000 01)	10.21	317.06	473.68

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