Nd–Hf Isotopic Characteristics, Evolution Trend and Tectonic Setting of Triassic Magmatic Rocks in the Eastern Segment of East Kunlun Orogeny
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摘要:
作为中央造山系西段的重要组成部分，东昆仑造山带以大面积区域性展布的三叠纪岩浆岩为鲜明特色。依据收集的东昆仑东段三叠纪岩浆岩96件锆石U–Pb年代学数据，限定三叠纪岩浆作用时间为252～212 Ma。结合岩石组合，将其进一步划分为早（252～238 Ma）、中（238～226 Ma）、晚（226～212 Ma）3期，其中岩浆活动峰值为早期（252～238 Ma）。Nd同位素数据（106件）统计结果表明：东昆仑东段三叠纪岩浆岩εNd(t)值为–9.4～–1.7，大多为–6.5～–3.0；Nd模式年龄TDM(Nd)为0.72～1.88 Ga，大多为1.00～1.80 Ga。Hf同位素数据（全岩、锆石；41件）统计结果表明：东昆仑东段三叠纪岩浆岩εHf(t)值变化较大（–8.4～+12.4），主要为–4.5～+2.0；地壳模式年龄TDMC(Hf)值为0.49～ 1.80 Ga，大多为1.15～1.55 Ga。整体而言，三叠纪岩浆岩物源以中元古代壳源物质的再造为主，新生地壳（＜1.0 Ga）和古元古代地壳有所参与，但比例小。从岩浆活动早期（252～238 Ma）到中期（238～226 Ma）再到晚期（226～212 Ma），εNd(t)值在岩浆活动早期（特别是在早三叠世）较高，正的εHf(t)值占据很大比例，物源中存在较多的新生物质；中期以较低的εNd(t)值和负的εHf(t)值为主，Hf模式年龄显示出现古元古代物质；晚期Nd–Hf模式年龄揭示较古老的壳源组分增多。这种岩浆岩物源演变趋势，与东昆仑东段三叠纪具俯冲到同碰撞再到碰撞后的构造演化背景一致。
Abstract:As a major component of the western segment of the Central Orogenic System, the East Kunlun Orogeny is characterized by the largely exposed of Triassic magmatic rocks. Based on the collected zircon U–Pb geochronological data of 96 Triassic magmatic rocks in the eastern segment of the East Kunlun orogeny, the Triassic magmatic activity is limited to 212～252 Ma, and can be further divided into three stages: early– (238～252 Ma), middle– (226～238 Ma) and late–stage (212～226 Ma). Among them, the peak magmatic period is the early stage (238～252 Ma). The statistical results of 106 Nd isotopes of Triassic magmatite in the eastern segment of the East Kunlun Orogeny show that εNd(t) values range from –9.4 to –1.7, mainly concentrated between –6.5 and –3.0, and the Nd model ages (TDM(Nd)) range from 0.72 to 1.88 Ga, mainly concentrated between 1.00 and 1.80 Ga. The statistical results of 41 Hf isotopes (whole rock, zircon) of Triassic magmatite show that εHf(t) values vary greatly (–8.4 to +12.4), mainly concentrated between –4.5 and +2.0, and the crustal model ages (TDMC(Hf)) range from 0.49 to 1.80 Ga, mainly concentrated between 1.15 and 1.55 Ga. Overall, the Triassic magmatic rocks are mainly derived from the reworking of Mesoproterozoic crustal materials, with minor involvement of juvenile crust (＜ 1.0 Ga) and Paleoproterozoic crustal materials. From the early stage (237～250 Ma) to middle stage (226～238 Ma) and then to late stage (212～226 Ma), the Nd–Hf isotopic parameters seems exhibit a certain evolutionary trend. In the early stage especially in the early Triassic, the εNd(t) values are higher, and positive εHf(t) values occupy a large proportion, indicating the presence of more juvenile material in the source. In the middle stage, lower εNd(t) values and negative εHf(t) values dominate the major proportion, and Hf model ages (TDMC(Hf)) reveals the presence of Paleoproterozoic crustal material. In the late stage, the Nd–Hf model ages reveal an increase in older crustal source components. This magmatic source evolutionary trend is consistent with the tectonic evolution setting of subduction to collision and then to post–collision in the eastern segment of the East Kunlun orogeny in Triassic period.
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Key words:
- magmatic rock /
- zircon geochronology /
- Nd–Hf isotopes /
- juvenile crust /
- the eastern part of East Kunlun
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表 1 东昆仑东段三叠纪岩浆岩锆石U–Pb年代学数据、全岩Nd同位素数据和全岩与锆石Hf同位素数据表
Table 1. zircon U–Pb ages, whole rock Nd isotopes and Hf isotopes (whole and zircon) of the Triassic Magmatite from the eastern part of East Kunlun orogeny
年龄
编号样品号 岩性 结晶
年龄误差 测年方法 εNd （t）值
（均值）Nd模式年龄TDM （Ma）值 （均值） εHf （t）值
（均值）Hf模式年龄TDMC （Ma）
值 （均值）数据来源 （Ma） （Ma） 1 08BL08-1 花岗闪长岩 252 3 LA–ICP–MS
锆石 U–Pb–5.30 1.58 Zhang et al.，2012 2 14-SST-37 花岗斑岩 252 3 LA–ICP–MS
锆石 U–Pb1.56～12.41 （6.14） 0.49～1.183 （0.89） Ren et al.，2016 3 DL09-21 花岗闪长岩 251 1 LA–ICP–MS
锆石 U–Pb–2.57 1.23 2.72 1.11 Huang et al.，2014 4 DL09-27 花岗闪长岩 251 1 LA–ICP–MS
锆石 U–Pb–2.63 1.19 2.11 1.15 Huang et al.，2014 5 10NM63-10 苏长辉长岩 251 2 LA–ICP–MS
锆石 U–Pb–7.36～–3.61
（–5.18）1.32～1.62
（ 1.46）–2.39～1.06
（–0.88）1.21～1.43 （1.34） 熊富浩等，2011 6 XH040916-6 花岗闪长岩 251 5 LA–ICP–MS
锆石 U–Pb–4.00 1.15 Chen et al.，2012 7 DL09-18 花岗闪长岩 251 1 LA–ICP–MS
锆石 U–Pb–2.82 1.13 3.35 1.07 Huang et al.，2014 8 DL09-15 花岗闪长岩 250 1 LA–ICP–MS
锆石 U–Pb–4.12～–3.14 （–3.63） 1.32～1.36
（ 1.34）3.30 1.07 Huang et al.，2014 9 XH040915-4 花岗闪长岩 250 5 LA–ICP–MS
锆石 U–Pb–4.41 1.26 Chen et al.，2012 10 DL09-31 镁铁质暗色微粒包体 250 2 LA–ICP–MS
锆石 U–Pb–2.15～–2.07 （–2.11） 0.74～0.74 （0.74） –3.08 1.47 Huang et al.，2014 1.54 1.18 11 DL09-13 花岗闪长岩 249 1 LA–ICP–MS
锆石 U–Pb–4.47～–2.15 （–3.31） 1.11～1.39
（ 1.25）2.37 1.13 Huang et al.，2014 12 11BL03-1 granodiorite 249 2 LA–ICP–MS
锆石 U–PbXiong et al.，2014 13 DL09-30 花岗闪长岩 249 2 LA–ICP–MS
锆石 U–Pb–1.67 0.72 2.09 1.15 Huang et al.，2014 14 br01-1 角闪辉长岩 249 4 LA–ICP–MS
锆石 U–Pb熊富浩等，2011 15 DL09-17 镁铁质暗 249 1 LA–ICP–MS
锆石 U–Pb–3.92 1.61 4.35 1.00 Huang et al.，2014 16 DL09-22 镁铁质暗 249 1 LA–ICP–MS
锆石 U–Pb–2.95 1.27 4.44 1.00 Huang et al.，2014 17 DL09-07 镁铁质暗 249 1 LA–ICP–MS
锆石 U–Pb–2.19 1.31 3.89 1.03 Huang et al.，2014 18 DL09-08 花岗闪长岩 248 1 LA–ICP–MS
锆石 U–Pb–3.69 1.32 3.18 1.08 Huang et al.，2014 –1.38 1.37 19 XH040916-8B 花岗岩 248 5 LA–ICP–MS
锆石 U–PbChen et al.，2012 20 DL09-24 镁铁质暗 248 1 LA–ICP–MS
锆石 U–Pb–4.03 1.57 3.93 1.03 Huang et al.，2014 1.74 1.17 21 09NM66-1 quartz diorite 248 4 LA–ICP–MS
锆石 U–PbXiong et al.，2014 22 ZW-14 二长花岗岩 246 2 ICP–MS
锆石 U–Pb强娟，2008 23 XH040916-8A 英云闪长岩 245 4 LA–ICP–MS
锆石 U–Pb–4.73 1.45 Chen et al.，2012 24 BLGTC104-B1 granite 245 2 LA–ICP–MS
锆石 U–Pb–3.32～–3.31 （–3.31） 1.08～1.16 （1.12） –1.38～1.71 （0.23） 1.17～1.36 （1.26） Ding et al.，2014 25 HSG5-1 流纹岩 245 2 LA–ICP–MS
锆石 U–Pb–4.75～–4.17 （–4.49） 1.29～1.32 （1.31） –4.18～0.19 （–1.48） 1.26～1.54 （1.37） Li et al.，2015a 26 AK18 花岗斑岩 244 2 SIMS
锆石 U–Pb刘建楠等，2012 27 14-SST-51 花岗闪长岩 244 3 LA–ICP–MS
锆石 U–Pb–3.72～1.01 （–1.77） 1.21～1.51 （1.39） Ren et al.，2016 28 BLG-XJ-B8 granite 244 2 LA–ICP–MS
锆石 U–Pb–3.59 1.07 –3.68～1.33 （–0.16） 1.19～1.51 （1.28） Ding et al.，2014 29 BLG-XJ-B9 granite 244 2 LA–ICP–MS
锆石 U–Pb–3.24～–3.14 （–3.19） 0.99～1.16 （1.08） –1.52～1.67 （0.29） 1.17～1.37 （1.26） Ding et al.，2014 30 HSG1-2 流纹岩 244 2 LA–ICP–MS
锆石 U–Pb–5.93～–4.56 （–5.22） 1.31～1.45 （1.37） –2.94～1.37 （–0.79） 1.19～1.46 （1.32） Li et al.，2015a 31 ASH- 2# 闪长岩 244 1 LA–ICP–MS
锆石 U–Pb李碧乐等，2012 32 08BL10-1 花岗闪长岩 244 2 LA–ICP–MS
锆石 U–Pb–5.30～–4.74 （–5.02） 1.42～1.63 （1.53） Zhang et al.，2012 33 DG25-4 流纹质凝灰岩 244 2 LA–ICP–MS
锆石 U–Pb吴芳，2010 34 13NGT-04-1 Host granodioriteite 243 1 LA–ICP–MS
锆石 U–Pb–7.13～–5.76 （–6.31） 1.44～1.8 （1.61） –0.97～2.44 （0.4） 1.12～1.33 （1.25） Xia et al.，2015a 35 （13NGT-04-2） Dioritic enclave 243 1 LA–ICP–MS
锆石 U–Pb–8.30～–5.76 （–6.86） 1.40～1.88 （1.58） –3.51～1.67 （–1.02） 1.17～1.50 （1.34） Xia et al.，2015a 36 09dl36 -1 quartz diorite 243 1 LA–ICP–MS
锆石 U–Pb–5.24 1.52 –3.69～–2.38 （–2.99） 1.42～1.51 （1.46） Xiong et al.，2014 37 08BL01-2 花岗闪长岩 243 2 LA–ICP–MS
锆石 U–Pb–7.46～–5.22 （–6.10） （1.23～1.77）/ 1.49 Zhang et al.，2012 38 QW1032 花岗闪长岩 242 6 SHRIMPⅡ
锆石U–PbLiu et al.，2004 39 XH040916-1 碱性花岗岩 242 5 LA–ICP–MS
锆石 U–Pb–4.62 1.69 Chen et al.，2012 40 XH040915-5 花岗闪长岩 241 4 LA–ICP–MS
锆石 U–Pb–4.84 1.32 Chen et al.，2012 41 11BL01-2 granodiorite 241 1 LA–ICP–MS
锆石 U–PbXiong et al.，2014 42 08BL01-03 石英闪长岩 241 2 LA–ICP–MS
锆石 U–Pb–6.44 1.54 Zhang et al.，2012 43 09NM52-1 granodiorite 241 3 LA–ICP–MS
锆石 U–Pb–6.49 1.43 Xiong et al.，2014 44 Q1013 暗色微粒包体 241 5 SHRIMPⅡ
锆石U–PbLiu et al.，2004 45 XH040916-3 花岗闪长岩 241 4 LA–ICP–MS
锆石 U–Pb–4.84 1.32 Chen et al.，2012 46 QW1160 角闪辉长岩 239 6 SHRIMPⅡ
锆石U–PbLiu et al.，2004 47 XH040914-5 钾长花岗岩 239 5 LA–ICP–MS
锆石 U–Pb–9.40 1.67 Chen et al.，2012 48 09NM73-1 syenogranite 239 2 LA–ICP–MS
锆石 U–Pb–4.78 1.41 –6.85～–3.85 （–4.87） 1.51～1.7 （1.58） Xiong et al.，2014 49 11ASY-008 石英闪长岩 238 2 LA–ICP–MS
锆石 U–Pb李金超等，2014 50 WSA-6 黑云母花岗岩 238 2 ICP–MS
锆石 U–Pb强娟等，2008 51 14-SST-74 花岗闪长岩 237 3 LA–ICP–MS
锆石 U–Pb–8.39～0.51 （–2.80） 1.24～1.80 （1.45） Ren et al.，2016 52 09DL31-1 syenogranite 236 4 LA–ICP–MS
锆石 U–Pb–6.67 1.33 Xiong et al.，2014 53 09DL40-2 granitic porphyry 236 2 LA–ICP–MS
锆石 U–Pb–7.79～–6.89 （–7.34） 1.36～1.53 （1.45） Xiong et al.，2014 54 HMH-2 花岗闪长岩 235 2 LA–ICP–MS
锆石 U–Pb–4.40～–3.85 （–4.12） 1.23～1.29 （1.25） 张宏飞等，2006 55 11HR 07 花岗闪长斑岩 235 5 LA–ICP–MS
锆石 U–Pb宋忠宝等，2013 56 XH040917-1A 闪长岩 235 4 LA–ICP–MS
锆石 U–Pb–5.38 1.48 Chen et al.，2012 57 14-SST-59 钾长花岗岩 234 2 LA–ICP–MS
锆石 U–Pb–3.79～3.82 （–0.14） 1.02～1.51 （1.27） Ren et al.，2016 58 14-SST-44 钾长花岗岩 233 2 LA–ICP–MS
锆石 U–Pb–2.12～4.38 （–0.39） 0.99～1.40 （1.29） Ren et al.，2016 59 B-006 花岗闪长斑岩 233 1 LA–ICP–MS
锆石 U–PbXia et al.，2014 60 B-004 二长花岗斑岩 232 1 LA–ICP–MS
锆石 U–PbXia et al.，2014 61 14-SST-42 钾长花岗岩 232 3 LA–ICP–MS
锆石 U–Pb–2.46～4.96 （0.99） 0.95～1.42 （1.20） Ren et al.，2016 62 11BL06-1 syenogranite 232 1 LA–ICP–MS
锆石 U–Pb–6.39～–5.88 （–6.13） 1.09～1.19 （1.14） Xiong et al.，2014 63 08BL09 正长花岗岩 231 3 LA–ICP–MS
锆石 U–Pb–6.09 1.3 Zhang et al.，2012 64 XH040916-4 花岗闪长岩 229 4 LA–ICP–MS
锆石 U–Pb–5.53 1.11 Chen et al.，2012 65 1059 花岗岩 228 2 LA–ICP–MS
锆石 U–PbDai et al.，2013 66 RSX12-48 rhyolite porphyry 228 2 LA–ICP–MS
锆石 U–Pb–5.10 1.42 –0.93 1.32 Hu et al.，2016 –1.45 1.35 67 SQ-04-1 斜长花岗岩 227 1 LA–ICP–MS
锆石 U–Pb–8.21～0.15 （–5.1） 1.25～1.78 （1.58） Xia et al.，2015b 68 JDG-PD1-N22 granodiorite porphyry 227 1 LA–ICP–MS
锆石 U–Pb–8.29～–7.88 （–8.12） 1.59～1.66 （1.63） Li et al.，2015a 69 2228—8 花岗闪长岩 227 4 LA–ICP–MS
锆石U–Pb李小江等，2015 70 SQ-04-2 斜长花岗岩 227 1 LA–ICP–MS
锆石 U–Pb–6.92～0.42 （–4.48） 1.23～1.7 （1.54） Xia et al.，2015b 71 Jan-98 闪长岩 226 2 LA–ICP–MS
锆石 U–Pb李佐臣等，2013 72 12NM29-5 MMEs 225 1 LA–ICP–MS
锆石 U–PbXiong et al.，2014 73 11124/2 花岗闪长岩 225 5 LA–ICP–MS
锆石 U–Pb陈国超等，2013a 74 11124/1 闪长质包体 225 4 LA–ICP–MS
锆石 U–Pb陈国超等，2013a 75 DQ2-5 花岗闪长岩 224 2 LA–ICP–MS
锆石U–Pb杨拴海等，2015 76 09DL40-1 porphyritic granodiorite 224 1 LA–ICP–MS
锆石 U–Pb–5.89 1.22 –3.41～–1.05 （–2.53） 1.33～1.48 （1.42） Xiong et al.，2014 77 Sd-2 石英闪长玢岩 223 2 LA–ICP–MS
锆石 U–Pb刘建平等，2012 78 XA30-1 二长花岗岩 223 2 LA–ICP–MS
锆石 U–Pb–5.72～–3.82 （–4.91） 1.18～1.35 （1.26） 罗明非等，2014 79 ST05 石英闪长岩 223 2 LA–ICP–MS
锆石 U–Pb–2.05～4.06 （1.13） 1.00～1.39 （1.19） Wang et al.，2016 80 ZK2523B-02 石英闪长岩 223 2 LA–ICP–MS
锆石 U–PbWang et al.，2016 81 NMHX-1-2 Granodiorites 222 1 LA–ICP–MS
锆石 U–PbXia et al.，2014 82 NMHX-03 Gabbroic enclaves 222 1 LA–ICP–MS
锆石 U–PbXia et al.，2014 83 14-SST-08 Granodiorites 221 2 LA–ICP–MS
锆石U–PbRen et al.，2016 84 XA-63-1 花岗闪长岩 221 2 LA–ICP–MS
锆石 U–Pb–6.44～–5.23 （–5.83） 1.43～1.48 （1.46） 罗明非等，2014 85 NMHX-02 Diorite enclaves 220 1 LA–ICP–MS
锆石 U–PbXia et al.，2014 86 3154—5 granodiorite 220 3 LA–ICP–MS
锆石U–PbYang et al.，2015 87 Sg-1 花岗斑岩 220 3 LA–ICP–MS
锆石 U–Pb刘建平等，2012 88 3154-TW-5 花岗闪长岩 219 5 LA–ICP–MS
锆石U–Pb徐多勋等，2015 89 14-SST-20 花岗斑岩 219 3 LA–ICP–MS
锆石U–PbRen et al.，2016 90 11136/3 石英闪长岩 218 1 LA–ICP–MS
锆石 U–Pb陈国超等，2013a 91 WQ-4 花岗闪长岩 218 2 LA–ICP–MS
锆石 U–Pb–6.12～–4.77 （–5.56） 1.32～1.7 （1.53） 张宏飞等，2006 92 XI01-B1 diorite 215 3 LA–ICP–MS
锆石 U–Pb–5.06 1.32 –4.21～–0.61 （–2.27） 1.29～1.52 （1.4） Ding et al.，2014 93 XI01-B2 diorite 215 4 LA–ICP–MS
锆石 U–Pb–5.70～–5.16 （–5.43） 1.4～1.45 （1.43） –4.37～–2.19 （–3.05） 1.39～1.53 （1.44） Ding et al.，2014 94 ZW-06 二长花岗岩 215 1 ICP–MS
锆石U–Pb强娟，2008 95 DL09-01 流纹岩 214 1 LA–ICP–MS
锆石 U–Pb–2.96～–2.96 （–2.96） 1.37～1.42 （1.4） 1.05 1.18 丁烁等，2011 96 DL09-05 流纹岩 212 2 LA–ICP–MS
锆石 U–Pb–3.06～–3.04 （–3.05） 1.41～1.51 （1.46） 0.50 1.22 丁烁等，2011 
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