Geochemistry and zircon U-Pb age of the Permian radial diabase dyke from southern Xinyuan area, Western Tianshan Mountains, Xinjiang, and their geological significance
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摘要:
南天山古洋盆闭合、碰撞造山时限等洋-陆格局的演化过程是西天山备受关注的地球动力学问题，紧邻那拉提北缘断裂的新源地区二叠纪放射状辉绿岩墙提供了解决这个问题的良好机会。新源地区辉绿岩具辉绿结构，斑晶为斜长石和普通辉石，基质主要由斜长石、辉石、绿泥石等副矿物组成。岩石为富钠贫钾、过铝质、钙碱性岩浆系列。辉绿岩岩墙富集Rb、Th和La等元素，明显亏损Nb、Ta等元素，显示εNd（t）为正值（+3.3~+3.8）和低的初始锶比值（（87Sr/86Sr）i=0.70479~0.70548），幔源物质明显。与该区石炭纪玄武岩地球化学性质相似，岩浆可能为二叠纪软流圈和岩石圈相互作用的产物，其起源与软流圈上涌有关。辉绿岩岩墙LA-ICP-MS锆石U-Pb年龄为280.4±3.6Ma，被解释为岩脉成岩年龄，即岩脉形成于二叠纪。结合区域构造背景，推测辉绿岩岩脉形成于塔里木地块与中天山-伊犁地块碰撞闭合后的板内伸展环境，并与南天山洋洋壳岩石圈板块断离密切相关。
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关键词:
- 辉绿岩岩墙 /
- 二叠纪 /
- 岩石成因 /
- LA-ICP-MS锆石U-Pb年龄 /
- 新疆西天山
Abstract:The accretionary processes of the Western Tianshan Mountains is a hot topic but there is no consensus on the final closure of the Paleo-South Tianshan Ocean basin and subsequent post-collision process. The Permian radial diabase dyke exposed near the North Nalati Fault provides an opportunity for understanding these problems. The dyke shows a typical ophitic texture. The phenocryst is composed of plagioclase and pyroxene, and the substrate is mainly composed of plagioclase, pyroxene, chlorite and some other accessory minerals. The diabase dyke hassodium-rich, potassium-poor and peraluminous characteristics, and hence belongs to the calc-alkaline series. The dyke is characterized by depletion of Nb and Ta and enrichment of Rb, Th and La, and has mantle source material with positive εNd(t) values (+ 3.3~+ 3.8) and low initial Sr((879Sr/86Sr)i=0.70479~0.70548)). These geochemical characteristics are similar to those of the Carboniferous basalt of the study area, suggesting that the parental magma was formed by the interaction of asthenosphere and lithosphere. Zircon U-Pb dating of the dyke yielded an age of 280.4 ±3.6Ma. Combined with regional tectonic background, the authors hold that these Permian diabaseswere formed fromintraplate extension after the collision stage which was closely related to the oceanic lithosphere break-off.
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图 6 新源南部辉绿岩墙稀土元素球粒陨石标准化配分模式（a）、微量元素原始地幔标准化蛛网图（b）和锆石稀土元素球粒陨石配分模式图（c）（大哈拉军山组火山岩数据据参考文献[58]）
Figure 6.
表 1 新源南部辉绿岩墙LA-ICP-MS锆石U-Th-Pb同位素测定结果
Table 1. LA-ICP-MS U-Th-Pb data for zircons from diabase dyke in southern Xinyuan area
样点编号 元素含量/10-6 Th/U 同位素比值 年龄/Ma 238U 232Th 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 20-01 1418 4294 3.03 0.054 0.002 0.338 0.012 0.045 0.001 283.9 6.1 392.6 96.5 20-02 4436 13171 2.97 0.052 0.001 0.327 0.007 0.046 0.001 286.6 5.8 298.1 71.8 20-03 1431 3606 2.52 0.056 0.002 0.347 0.010 0.045 0.001 282.9 5.9 456.3 79.6 20-04 1302 2207 1.69 0.053 0.002 0.336 0.010 0.045 0.001 285.0 5.9 367.3 84.4 20-05 2388 7741 3.24 0.055 0.001 0.333 0.008 0.043 0.001 272.3 5.5 451.8 72.9 20-06 1605 3262 2.03 0.053 0.001 0.325 0.008 0.044 0.001 280.5 5.7 329.9 76.7 20-07 4354 16456 3.78 0.053 0.001 0.334 0.008 0.045 0.001 285.0 5.7 356.5 72.5 20-08 20389 5304 2.60 0.058 0.002 0.349 0.010 0.044 0.001 275.8 5.7 531.3 79.7 20-09 771 1167 1.51 0.051 0.002 0.312 0.013 0.044 0.001 279.7 6.0 245.8 106.5 20-10 2198 5204 2.37 0.052 0.002 0.314 0.009 0.043 0.001 274.0 5.7 306.0 86.0 
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表 2 新源南部辉绿岩墙主量、微量及稀土元素组成
Table 2. Major, trace elements and REE data for diabase dyke in southern Xinyuan area
样品号 HSX-1 HSX-3 HSX-4 HSX-5 HSX-6 SiO2 47.72 47.47 47.46 47.64 47.45 TiO2 3.13 3.32 3.34 3.30 3.55 Al2O3 14.04 13.70 13.70 13.52 13.67 Fe2O3 13.77 8.68 7.50 8.61 10.05 FeO 2.65 7.90 8.34 7.82 6.84 MnO 0.22 0.24 0.26 0.24 0.23 MgO 5.19 5.44 5.51 5.44 4.93 CaO 8.76 8.60 9.51 9.12 8.81 Na2O 3.06 2.98 2.85 2.84 2.97 K2O 0.80 0.97 0.82 0.78 0.74 P2O5 0.66 0.70 0.71 0.70 0.75 烧失量 2.26 2.74 2.13 2.07 3.30 Rb 29.80 40.60 39.90 38.00 32.90 Ba 321 340 270 311 399 Th 2.65 2.53 2.44 2.77 2.80 U 0.86 0.83 0.88 0.91 0.99 Nb 6.40 6.84 6.78 7.34 8.11 Ta 0.64 0.61 0.59 0.66 0.69 Sr 334 318 321 317 324 Zr 341 349 336 386 413 Hf 9.04 9.48 9.12 10.40 10.60 Y 51.40 52.50 55.60 63.20 64.50 La 17.90 20.50 19.40 23.30 24.70 Ce 44.50 48.10 47.60 55.60 54.60 Pr 6.28 7.31 6.97 8.30 8.37 Nd 30.70 34.10 33.50 38.30 39.00 Sm 8.24 9.47 9.31 10.60 10.90 Eu 3.13 3.36 3.13 3.41 3.61 Gd 7.67 8.72 8.67 9.68 10.3 Tb 1.57 1.77 1.7 1.91 1.99 Dy 9.74 10.7 10.7 11.9 12.3 Ho 2.02 2.22 2.26 2.52 2.52 Er 5.21 5.51 5.73 6.06 6.28 Tm 1.04 1.09 1.09 1.24 1.22 Yb 6.03 6.34 6.39 7.13 7.28 Lu 0.84 0.88 0.90 0.98 0.96 注：锆石单矿物从HXS-1样品中挑选；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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表 3 新源南部辉绿岩墙Sr-Nd同位素组成
Table 3. Sr-Nd isotopic compositions ofdiabasedyke in southern Xinyuan area
样品号 HXS-1 HXS-3 HXS-4 HXS-5 HXS-6 87Rb/86Sr 0.304 0.439 0.394 0.371 0.319 87Sr/86Sr 0.706695 0.707055 0.706770 0.706275 0.756585 147Sm/144Nd 0.1684 0.1676 0.1686 0.1690 0.1671 143Nd/144Nd 0.512766 0.512756 0.512779 0.512759 0.512795 (87Sr/86Sr)i 0.70548 0.70530 0.70520 0.70479 0.75531 (143Nd/144Nd)i 0.512457 0.512448 0.512470 0.512449 0.512488 εNd(t) 3.5 3.3 3.8 3.4 4.1 fSm/Nd -0.14 -0.15 -0.14 -0.14 -0.15 tDM 1297 1307 1259 1338 1166 注：(147Sm/144Nd)CHUR=0.1967, (143Nd/144Nd)CHUR=0.512638, (87Rb/86Sr)CHUR=0.0847, (87Sr/86Sr)CHUR=0.7047, 计算辉绿岩墙的εNd(t)和tDM时T=280.4Ma
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