Research and Prospecting Progress of Dayishan Pluton in Nanling Range
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摘要: 大义山岩体为南岭地区重要的成锡岩体之一.结合资料及项目组高精度锆石LA-ICP-MS U-Pb定年结果将其划分为6个岩相（填图）单元，分别为细中粒斑状角闪黑云二长花岗岩（ηγJ3a）、中粗粒斑状黑云母二长花岗岩（ηγJ3b）、中细粒斑状黑云母二长花岗岩（ηγJ3c）、细粒少斑状黑云母二长花岗岩（ηγJ3d）、细粒斑状（含电气石）二云母二（正）长花岗岩（ηγJ3e）及细粒少斑状二云母正长花岗岩（ζγJ3f）；其成岩时代集中于160~150 Ma，整体属燕山早期.岩石地球化学和同位素研究表明：大义山岩体为S型花岗岩；主要源自变质表壳岩的熔融，有少量新生陆壳贡献.区内锡成矿年龄集中于160~150 Ma，为南岭W-Sn-Mo多金属成矿作用峰期产物；形成于与太平洋板块俯冲有关的陆内伸展环境.结合资料及找矿进展指出大义山地区找矿方向：（1）加强云英岩型铷矿的调查与评价；（2）加强大义山地区晚期高分异花岗岩、伟晶岩脉的调查与评价；（3）加强大义山岩体外接触带的调查与评价；（4）大义山岩体深部及隐伏找矿.Abstract: The Dayishan pluton is one of the important tin-forming plutons in the Nanling Range. Based on the data and the high precision zircon LA-ICP-MS U-Pb dating results, in this paper it divides it into 6 lithofacies (mapping) units for field identification: fine-medium grained porphyritic amphibole biotite monzogranite (ηγJ3a), medium-coarse grained porphyritic biotite monzogranite(ηγJ3b), medium-fine grained porphyritic biotite monzogranite (ηγJ3c), fine-grained porphyritic biotite monzogranite (ηγJ3d), fine-grained porphyritic (including tourmaline) two-mica adamellite (ηγJ3e) and fine-grained porphyritic two-mica syenogranite (ζγJ3f), the diagenetic age is concentrated in 160-150 Ma, and the whole belongs to the Early Yanshanian. The rock geochemistry and isotopic characteristics indicate that the Dayishan pluton belongs to the S-type granite, which is mainly derived from the melting of metamorphic supracrustal rocks, with a small amount contribution of juvenile crust.In addition, the age of tin mineralization in the Dayishan area is concentrated at 160-150 Ma, which is the peak product of W-Sn-Mo polymetallic mineralization in the Nanling range; formed in an intra-land extensional environment related to the subduction of the Pacific plate. Combining the data and prospecting progress to point out the prospecting direction of Dayishan area: (1) strengthen the investigation and evaluation of greisen-type rubidium deposits, (2) strengthen the investigation and evaluation of late high-differentiated granite and pegmatite veins in Dayishan area, (3) strengthen the investigation and evaluation of the outer contact zone of Dayishan pluton, (4) Deep and concealed prospecting of Dayishan pluton.
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Key words:
- zircon U-Pb age /
- geochemistry /
- prospecting progress /
- Sn deposit /
- Dayishan /
- Nanling range /
- petrology /
- mineralogy
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图 4 大义山岩体Na2O+K2O/SiO2(a)、R1-R2(b)、K2O-SiO2(c)、A/NK-A/CNK(d)图解
图a据Middlemost（1994）；图b据De la Roche et al.（1980）；图c据Peccerillo and Taylor（1976）；图d据Maniar and Piccoli（1989）.R1=4×Si-11×(Na+K)-2×(Fe+Ti); R2=6×Ca+2×Mg+Al
Fig. 4. The Na2O+K2O/SiO2 (a), R1-R2 (b), K2O-SiO2 (c), A/NK-A/CNK (d) diagrams of Dayishan pluton
图 5 大义山岩体REE配分图(Sun and McDonough, 1989)
Fig. 5. Chondrite-normalized REE patterns of Dayishan pluton (Sun and McDonough, 1989)
图 6 大义山岩体Rb/Sr、Nb/Ta、Zr/Hf及Sm/Nd与年龄协变图解
Fig. 6. Rb/Sr, Nb/Ta, Zr/Hf and Sm/Nd vs. age covariance diagrams of Dayishan pluton
图 7 大义山岩体微量元素蛛网图(Sun and McDonough, 1989)
Fig. 7. Spider diagrams of trace elements in Dayishan pluton(Sun and McDonough, 1989)
图 8 大义山岩体单颗粒锆石εHf(t)、TDM2频数直方图
Fig. 8. Frequency histograms of single-grain zircon εHf(t) and TDM2 in Dayishan pluton
图 9 大义山岩体Rb-Y(a)、Rb-Th(b)协变图解(底图引自Chappell, 1999)
Fig. 9. Rb-Y (a) and Rb-Th (b) covariance diagrams of Dayishan pluton (base map after Chappell, 1999)
图 10 大义山岩体εNd(t)-ISr(a)、Al2O3+TFeO+MgO+TiO2-Al2O3/(TFeO+MgO+TiO2)(b)、CaO/(MgO+FeO)-Al2O3/(MgO+FeO) (c) and Rb/Sr-Rb/Ba(d)图解
图b引自Patiño Douce（1999）；图c和图d引自Patiño Douce and Harris（1998）
Fig. 10. εNd(t)-ISr(a), Al2O3+TFeO+MgO+TiO2-Al2O3/(TFeO+MgO+TiO2)(b), CaO/(MgO+FeO)-Al2O3/(MgO+FeO) (c) and Rb/Sr-Rb/Ba (d) diagrams of Dayishan pluton
图 11 大义山岩体Y-Nb(a)、Yb-Ta(b)、Rb-Yb+Ta(c)、Rb/30-Hf-3Ta(d) 构造判别图解
图a~c引自Pearce et al.（1984）；图d引自Harris et al.（1986）
Fig. 11. Y-Nb (a), Yb-Ta (b), Rb-Yb+Ta (c) and Rb/30-Hf-3Ta (d) construction discrimination diagrams of Dayi-shan pluton
表 1 大义山岩体锆石LA-ICP-MS U-Pb定年结果统计
Table 1. Zircon LA-ICP-MS U-Pb dating results statistics of Dayishan pluton
样品号 经度(°) 纬度(°) 测试对象 年龄（Ma） 填图单元 新岩相分类 传统单元划分 12D74-1 112.68 26.12 中粒斑状二长花岗岩 159.5±1.0 ηγJ3a 细中粒角闪黑云母二长花岗岩 湖冲庵单元(J1Hc) 14D38-2 112.71 26.07 中细粒含斑二长花岗岩 158.7±1.3 14D38-5 112.71 26.07 细中粒多斑状花岗岩 160.2±2.2 PM21-8 112.54 26.20 粗粒含斑花岗岩 159.3±0.9 ηγJ3b 中粗粒斑状黑云母二长花岗岩 岩前(J2Y) TC117b2 112.49 26.26 中粗粒斑状黑云母二长花岗岩 158.8±1.1 14D30-1 112.69 26.08 中细粒少斑二长花岗岩 157.0±1.4 PM21-27 112.57 26.25 细中粒黑云母花岗岩 153.5±0.9 ηγJ3c 中细粒斑状黑云母二长花岗岩 介头(J2J) PM21-19 112.56 26.23 细粒花岗岩 157.7±0.9 PM21-13 112.56 26.23 中细粒花岗岩 154.8±0.9 道士仙、岩前
(J2D、J2Y)PM21-9 112.55 26.21 细粒花岗岩 157.6±1.1 17D96 112.56 26.19 中粗粒巨斑黑云母二长花岗岩 156.2±2.0 14D32-1 112.67 26.08 细粒少斑状黑云母二长花岗岩 155.2±0.9 ηγJ3d 细粒少斑状黑云母二长花岗岩 下东卡坪、小恒(J1X)、
(J2X)17D61 112.46 26.16 中粒少斑黑云母二长花岗岩 155.8±1.5 17D62 112.57 26.19 中粒少斑黑云母二长花岗岩 154.9±1.9 17D68 112.57 26.19 细中粒斑状黑云母二长花岗岩 153.4±3.1 ηγJ3e 细粒(含)斑状(含电气石)二云母二(正)长花岗岩 杉树排、小恒
(J2Sh、J2X)17D97-1 112.57 26.19 细粒二云母二长花岗岩(含电气石) 154.0±2.5 17D97-2 112.57 26.19 中细粒斑状黑云母二长花岗岩 151.2±2.8 D2997 112.53 26.31 粗中粒斑状电气石黑云母花岗岩 154.1±1.0 杉树排(J2Sh) D0329-1 112.49 26.31 含电气石云英岩 151.7±1.1 14D36 112.57 26.24 中细粒含斑二长花岗岩 154.5±1.8 PM21-9 112.55 26.21 细粒花岗岩 151.6±1.1 ζγJ3f (微)细粒含斑状二云母正长花岗岩 小江(J3Xj) D2994 112.52 26.31 中细粒少斑二云母花岗岩 150.0±1.2 17D108 112.52 26.31 细中粒斑状二云母二长花岗岩 150.4±2.0 注：本文统计24个谐和年龄均为项目组未发表数据. 
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表 2 大义山矿田成矿年龄统计
Table 2. Metallogenic age statistics of Dayishan ore field
样号 矿床 测试对象 定年方法 年龄(Ma) 数据来源 14D30-2 猫仔山锡矿 锡石 LA-ICP-MS U-Pb 154.4±4.0 本项目 17D71-5 雷坪锡铜矿 锡石 LA-ICP-MS U-Pb 154.0±2.3 本项目 17D83 藤山坳锡矿 锡石 LA-ICP-MS U-Pb 156.7±4.3 Zhang et al.(2021) 17D99 狮形岭锡矿 锡石 LA-ICP-MS U-Pb 159.0±3.0 本项目 14D30-2 大义山猫仔山锡矿 铁锂云母 40Ar-39Ar 154.7±1.1 本项目 14D32-1 大义山猫仔山锡矿 铁锂云母 40Ar-39Ar 152.6±0.9 本项目 14D37-1 吴家坪锡矿 铁锂云母 40Ar-39Ar 150.4±0.9 Lu et al.(2022) 14D38-3 雷坪(大顺窿)钨锡矿 铁锂云母 40Ar-39Ar 151.1±0.9 本项目 白砂子岭锡矿 石英 Rb-Sr 160±1 张晓军等(2014) 14D38-1 雷坪(大顺窿)钨锡矿 石英 Rb-Sr 148±5 本项目 14D36 吴家坪锡矿 石英 Rb-Sr 148.1±2.1 本项目
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