Petrogenesis of fine-grained muscovite granite in the Lianhuashan tungsten tin ore cluster area of northern Jiangxi province-Constraints from zircon U-Pb isotopes and elemental geochemistry
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摘要:
赣北莲花山钨锡多金属矿集区位于扬子板块东南缘，是九岭-障公山钨锡铜金多金属成矿带的重要矿集区之一，分布有茅棚店、徐家尖、八字脑、棉花坞、莳山锡钨多金属矿床（点）十余处，以及潘村萤石矿、大洲高岭土矿等非金属矿产3~4处，但多为中小型矿床矿点，始终未有较大找矿突破，且对成矿期花岗岩缺乏精确的年代学及地球化学测试数据。对茅棚店锡钨矿床中细粒白云母花岗岩进行了岩相学、锆石U-Pb测年、地球化学特征研究，为区域成矿规律研究提供了直接证据。结果表明，白云母花岗岩锆石LA-ICP-MS U-Pb年龄为127.5±1.0 Ma，燕山期岩石单元由中粗粒似斑状黑云母花岗岩→中细粒似斑状黑云母花岗岩→中细粒—粗粒似斑状二云母花岗岩→中细粒白云母花岗岩→花岗斑岩组合。地球化学研究表明，该中细粒白云母花岗岩为高分异S型花岗岩，具有高硅（SiO2=75.08%~75.40%）、富碱、过铝质的特征及较高的分异指数DI，轻、重稀土元素分馏明显，呈左高右低的深"V"形，Eu表现为强烈的亏损，具有稀土元素四分组效应，Rb/Sr、Rb/Ba平均值分别为53.92和60.30，指示岩浆经历了多阶段分离结晶作用，此高分异花岗岩是区内钨锡矿床最主要的成矿地质体。
Abstract:Lianhuashan tin-tungsten polymetallic ore concentration district in northern Jiangxi province is located on the southeast edge of the Yangtze plate.It is one of the important ore concentration districts of the Jiuling-Zhanggongshan tungsten-tin-copper-gold polymetallic metallogenic belt.It is determined as a class Ⅰ metallogenic prospect, with more than 10 tin-tungsten deposits(occurrences), including Maopengdian, Xujiajian, Bazinao, Mianhuawu, Shishan and so on, there are several non-metallic mining occurrences, such as Pancun fluorite deposit and Dazhou kaolin deposit, but most of them are small and medium-sized mineral deposits, and there has never been a significant breakthrough in mineral exploration.In addition, there is a lack of accurate chronological and geochemical testing data for granite during the mineralization period.The petrography, zircon U-Pb chronology and whole-rock geochemistry of the medium and fine-grained muscovite granite in Maopengdian tin-tungsten deposit are studied in this paper, which provide direct evidence for the study of regional mineralization patterns.The results show that the zircon LA-ICP-MS U-Pb age of the muscovite granite is 126.7 ± 1.2 Ma.The Yanshanian rock unit consists of medium-coarse-grained porphyritic biotite granite →medium-fine-grained porphyritic biotite granite →medium-fine-grained-coarse-grained porphyritic mica granite→medium-fine muscovite granite→ granite porphyry, which is the result of crystallization differentiation of homologous magma evolution.Geochemical studies show that the medium and fine-grained muscovite granite is a highly differentiated S-type granite, which is characterized by high silicon(SiO2=75.08%~75.40%) and rich in alkali and peraluminous and high differentiation index DI.The fractionation of light and heavy rare earth elements is obvious, showing a deep V-type with high left and low right.Eu shows a strong negative anomaly and has four grouping effect of rare earth elements.The average values of Rb/Sr and Rb/Ba are 53.92 and 60.30 respectively, indicating that the magma experienced multi-stage fractional crystallization, and the highly differentiated granite is the main metallogenic geological bodies of W-Sn deposits in the area.
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图 5 茅棚店中细粒白云母花岗岩稀土元素球粒陨石标准化配分图(a)和微量元素原始地幔标准化蛛网图(b)(标准化值据Sun et al., 1989)
Figure 5.
图 6 茅棚店中细粒白云母花岗岩构造环境(a)、含矿性(b, Feiss，1978)及构造环境(c、d)判别图解
Figure 6.
表 1 茅棚店中细粒白云母花岗岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Pb dating results of medium-fine-grained muscovite granites in Maopengdian area
分析号 元素含量/10-6 Th/U 同位素比值 年龄/Ma 谐和度 Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 207Pb/235U 1σ H2-1 12.12 121.55 538.66 0.23 0.0477 0.0022 0.1252 0.0058 0.0191 0.0002 122 2 120 5 98% H2-2 84.85 190.01 3794.99 0.05 0.0497 0.0009 0.1372 0.0033 0.0200 0.0003 128 2 131 3 97% H2-3 40.78 80.30 1785.92 0.05 0.0511 0.0016 0.1426 0.0052 0.0201 0.0002 129 1 135 5 94% H2-5 33.60 45.55 1540.93 0.03 0.0490 0.0012 0.1333 0.0033 0.0197 0.0002 126 1 127 3 99% H2-6 10.73 37.78 483.31 0.08 0.0479 0.0019 0.1318 0.0052 0.0200 0.0003 127 2 126 5 98% H2-8 9.03 48.29 401.30 0.12 0.0484 0.0025 0.1322 0.0068 0.0199 0.0003 127 2 126 6 99% H2-9 3.77 84.97 149.06 0.57 0.0505 0.0040 0.1381 0.0109 0.0201 0.0004 128 3 131 10 97% H2-11 5.77 53.41 253.86 0.21 0.0494 0.0037 0.1352 0.0105 0.0198 0.0004 127 3 129 9 98% H2-12 7.05 41.45 328.74 0.13 0.0497 0.0030 0.1297 0.0074 0.0191 0.0004 122 2 124 7 98% H2-13 3.48 80.47 141.28 0.57 0.0480 0.0043 0.1325 0.0119 0.0201 0.0005 128 3 126 11 98% H2-14 51.37 78.42 2359.01 0.03 0.0495 0.0012 0.1374 0.0036 0.0201 0.0002 128 1 131 3 98% H2-15 8.27 44.56 384.06 0.12 0.0474 0.0031 0.1292 0.0093 0.0198 0.0004 127 3 123 8 97% H2-18 5.86 31.64 261.29 0.12 0.0529 0.0025 0.1462 0.0070 0.0201 0.0003 128 2 139 6 92% H2-24 23.32 57.13 1065.03 0.05 0.0480 0.0013 0.1319 0.0043 0.0199 0.0003 127 2 126 4 98% 
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表 2 茅棚店中细粒白云母花岗岩主量、微量和稀土元素分析结果
Table 2. Major, trace and rare earth element compositions of medium-fine-grained muscovite granite in Maopengdian area
元素 MPD-H1 MPD-H2 MPD-H3 MPD-H4 元素 MPD-H1 MPD-H2 MPD-H3 MPD-H4 SiO2 75.40 75.12 75.08 75.15 (La/Yb)N 2.05 2.01 4.13 2.25 Al2O3 14.23 13.66 14.34 14.34 (La/Sm)N 1.02 0.84 1.95 1.22 Fe2O3 1.66 1.17 1.50 1.69 TE1, 3 1.26 1.38 1.23 1.29 MgO 0.02 0.02 0.01 0.02 Li 280.00 204.00 316.00 343.00 CaO 0.23 0.32 0.25 0.26 Be 2.79 1.65 2.72 2.95 Na2O 2.81 3.90 3.92 3.68 Sc 2.60 2.60 3.10 3.20 K2O 3.28 3.49 3.38 3.19 V 1.00 1.00 1.00 1.00 MnO 0.05 0.04 0.05 0.05 Cr 9.00 11.00 9.00 9.00 TiO2 0.04 0.03 0.03 0.04 Co 0.30 0.20 0.30 0.30 P2O5 0.26 0.30 0.26 0.28 Ni 0.80 0.40 0.40 0.40 烧失量 1.93 1.09 1.28 1.32 Cu 105.00 11.50 48.20 52.70 FeO 1.15 0.92 1.07 1.22 Zn 164.00 581.00 132.00 144.00 总计 99.91 99.14 100.10 100.02 Ga 34.10 31.80 39.20 39.40 σ 0.08 0.10 0.10 0.09 Rb 826.00 805.00 831.00 852.00 K2O+Na2O 6.09 7.39 7.30 6.87 Sr 11.60 17.30 18.60 16.00 K2O/Na2O 1.17 0.89 0.86 0.87 Mo 0.87 1.47 0.83 0.87 CaO/Na2O 0.08 0.08 0.06 0.07 Cd 0.16 2.33 0.03 0.09 A/CNK 1.65 1.27 1.36 1.44 In 0.63 0.93 0.76 0.86 A/NK 1.74 1.34 1.42 1.51 Sb 0.10 0.13 0.08 0.08 DI 89.50 93.02 91.81 90.68 Cs 72.70 44.00 76.10 83.30 La 1.4 0.7 1.9 1.1 Ba 16.20 14.00 14.50 11.30 Ce 3.9 2.2 4.6 3.0 W 10.00 30.00 13.00 14.00 Pr 0.53 0.29 0.59 0.36 Re ＜0.002 ＜0.002 ＜0.002 ＜0.002 Nd 2.0 1.0 2.0 1.3 Tl 3.47 3.59 3.54 3.61 Sm 0.89 0.54 0.63 0.58 Pb 5.90 7.20 7.80 7.10 Eu 0.02 0.02 0.02 0.02 Bi 3.14 9.04 8.03 9.76 Gd 1.03 0.58 0.81 0.71 Th 4.03 3.21 3.62 3.99 Tb 0.23 0.14 0.17 0.18 U 11.25 19.60 12.05 19.55 Dy 1.37 0.70 1.10 0.93 Nb 20.30 71.70 28.70 29.30 Ho 0.21 0.10 0.17 0.15 Ta 4.40 14.70 6.50 7.20 Er 0.54 0.23 0.41 0.40 Zr 34.00 27.00 30.00 27.00 Tm 0.08 0.03 0.06 0.04 Hf 1.90 1.90 1.90 1.80 Yb 0.49 0.25 0.33 0.35 Rb/Sr 71.21 46.53 44.68 53.25 Lu 0.06 0.03 0.06 0.05 Rb/Ba 50.99 57.50 57.31 75.40 Y 7.8 3.8 5.4 5.0 Rb/Nb 40.69 11.23 28.95 29.08 ΣREE 12.75 6.81 12.85 9.17 Zr/Hf 17.89 14.21 15.79 15.00 LREE 8.74 4.75 9.74 6.36 Nb/Ta 4.61 4.88 4.42 4.07 HREE 4.01 2.06 3.11 2.81 Th/U 0.36 0.16 0.30 0.20 LREE/HREE 2.18 2.31 3.13 2.26 104×Ga/Al 4.53 4.40 5.16 5.19 Eu/Eu* 0.06 0.11 0.09 0.10 TZr/℃ 700.38 667.66 678.75 675.03 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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