Petrogenesis of Granite Porphyry in Mariaicuo Area, Shuanghu County, Tibet, and Constraints on the Evolution in the Middle Section of Bangonghu-Nujiang Suture Zone
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摘要: 为进一步了解班公湖-怒江缝合带中段闭合时限及构造演化模式，对西藏双湖县玛日埃错地区花岗斑岩进行了锆石U-Pb定年、岩石地球化学和Sr-Nd-Pb同位素方面的研究.结果显示，玛日埃错地区花岗斑岩形成于晚白垩世晚期（78.3±0.4 Ma）；具有高硅（72.41%~74.06%）、富碱（Na2O+K2O=6.66%~7.14%）的特点，属钙碱性系列，A/CNK值介于1.01~1.07，具弱过铝质特征；稀土配分模式为轻稀土富集、重稀土亏损的右倾型，并且富集大离子亲石元素（如Rb、Ba、U、K、Th等），亏损高场强元素（如Nb、Ta、P、Ti），显示其源区残留相为石榴石-角闪岩相.岩石具有相对较低的87Sr/86Sr初始比值（0.705 2~0.706 0）和较低的正εNd（t）值（1.5~2.3），及相对年轻的二阶段模式年龄（tDM2=692~758 Ma）；Pb同位素组成相对均一，具造山带演化特征.综合分析研究表明，玛日埃错地区花岗斑岩可能起源于伸展背景下的新生地壳部分熔融，源区富含流体，残留相以石榴石-角闪岩为主，不含斜长石.玛日埃错花岗斑岩形成于班怒洋盆闭合、两侧地体碰撞后的伸展背景下，表明班公湖-怒江缝合带中段地区在晚白垩世晚期已经进入后碰撞伸展阶段.Abstract: LA-ICP-MS zircon U-Pb dating, geochemical and Sr-Nd-Pb isotopic data analysis were conducted on the granite porphyry in Mariaicuo area in order to determine its formation time, petrogenesis, structural setting and geological significance. LA-ICP-MS zircon U-Pb dating of the granite porphyry in Mariaicuo yields a crystallization age of 78.3±0.4 Ma, indicating that the rock formed in the late of Late Cretaceous. Petrogeochemically, the samples of the rocks are high in SiO2 (72.41%-74.06%) and rich in Na2O+K2O of 6.66%-7.14%, which belong to calc-alkaline series. Its A/CNK ratios of 1.01-1.07 are of characteristics of weakly peraluminous granites. They are enriched in the large-ion lithospile elements of Rb, Ba, U, K and Th, and strongly depleted in high field strength elements Nb, Ta, P, and Ti. The REE distribution mode is obvious right-leaning, indicating that it remains garnet-amphibolite facies in source area. Their isotopic compositions are characterized by low initial (87Sr/86Sr)i of 0.705 2-0.706 0 and low positive εNd(t) (1.5-2.3) values and relatively young second-stage model age (tDM2=692-758 Ma) of crust. It has relatively homogeneous Pb isotope composition with the evolution of orogenic characteristics. Comprehensive analysis shows that the granite porphyry in Mariaicuo area may originate from the new partial melting of crust within extensional background, and its source region is enriched in fluid and remains garnet-amphibolite facies, excluding plagioclase. It formed in the post-collision extensional environment, which occurred after the closure of Bangonghu-Nujiang Tethys Ocean (BTO) and collision between tarranes on both sides, when the middle section of Bangonghu-Nujiang suture zone has entered the extension phase in Late Cretaceous.
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图 1 西藏双湖县玛日埃错地区地质简图
图a据宋扬等(2014)修改；图b据西藏双湖县赞宗错地区1/5万四幅区域地质调查成果报告修改(内部资料未刊发)
Fig. 1. Geological sketch map of Mariaicuo area, Shuanghu County, Tibet
图 2 西藏双湖县玛日埃错地区花岗斑岩野外及镜下正交偏光照片
a.花岗斑岩岩体野外宏观照片；b.岩石手标本照片；c, d.镜下正交偏光照片；Qz.石英；Pl.斜长石；Kfs.钾长石；γπ.花岗斑岩；Mag.磁铁矿
Fig. 2. Field image orthonormal polarizing microphotograph of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
图 3 西藏双湖县玛日埃错地区花岗斑岩样品R-GS锆石阴极发光图像及锆石U-Pb定年结果
Fig. 3. Cathodoluminescence images and result of zircon U-Pb isotopic analyses of granite porphyry from sample R-GS in Mariaicuo area in Shuanghu County, Tibet
图 4 西藏双湖县玛日埃错地区花岗斑岩样品R-GS的U-Pb年龄谐和图(a)和加权平均年龄(b)
Fig. 4. Zircon U-Pb data concordia diagram (a) and weighted average ages diagram (b) of granite porphyry from the sample R-GS in Mariaicuo area, Shuanghu County, Tibet
图 5 西藏双湖县玛日埃错地区花岗斑岩TAS图解(a)、K2O-SiO2图解(b)、A/NK-A/NCK图解(c)、(La/Yb)N-YbN图解(d)
图a据Middlemost(1994)；图b据Irvine and Baragar(1971)；图c据Shand(1927)；图d据Drummond and Defant(1990)
Fig. 5. TAS diagram (a), K2O vs. SiO2 diagram (b), A/NK vs. A/NCK diagram (c) and (La/Yb)N vs. YbN diagram (d) of granite porphyry in Mariaicuo arca, Shuanghu County, Tibet
图 6 西藏双湖县玛日埃错地区花岗斑岩岩石稀土元素球粒陨石标准化配分图解(a)和微量元素原始地幔标准化蛛网图(b)
Fig. 6. Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized trace elements spider diagram (b) of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
图 7 玛日埃错地区花岗斑岩207Pb/204Pb-206Pb/204Pb (a)和208Pb/204Pb-206Pb/204Pb增长曲线图(b)
Fig. 7. 207Pb/204Pb vs. 206Pb/204Pb (a) and 208Pb/204Pb vs. 206Pb/204Pb growth curve (b) of granite porphyry in Mariaicuo area
图 8 西藏双湖县玛日埃错地区花岗斑岩地球化学图解
Fig. 8. Diagrams of geochemistry of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
图 9 西藏双湖县玛日埃错地区花岗斑岩207Pb/204Pb-206Pb/204Pb图解(a)、208Pb/204Pb-206Pb/204Pb图解(b)、ISr-206Pb/204Pb图解(c)和εNd(t)-(87Sr/86Sr)i图解(d)
图b修改自Edwards et al.(1994)；图d修改自Miller et al.(1999)，Zhang et al.(2008)；康志强等(2010)
Fig. 9. 207Pb/204Pb vs. 206Pb/204Pb diagram (a), 208Pb/204Pb vs. 206Pb/204Pb diagram (b), ISr vs. 206Pb/204Pb diagram (c) and εNd(t) vs. (87Sr/86Sr)i diagram (d) of granite porphyry in Mariaicuo, Shuanghu County, Tibet
图 10 西藏双湖县玛日埃错地区花岗斑岩Y-Nb (a)、Rb-(Y+Nb) (b)、R1-R2图解(c)、Rb/10-Hf-3×Ta图解(d)、207Pb/204Pb-206Pb/204Pb (e)和208Pb/204Pb-206Pb/204Pb (f)图解
底图据Zartman and Doe(1981); Pearce et al.(1984); Batchelor and Bowden(1985); Harris(1986); Pearce(1996).①地幔斜长花岗岩；②板块碰撞前花岗岩；③板块隆起期花岗岩；④晚造山期花岗岩；⑤非造山区A型花岗岩；⑥同碰撞花岗岩；⑦造山期后A型花岗岩.LC.下地壳；UC.上地壳；OIV.洋岛火山岩；OR.造山带；图e，f中的A，B，C，D分别为各区域中样品相对集中区域；图a，b，c，d中班怒带中段数据来自高顺宝等(2011b)；定立等(2012)；王江朋等(2012)；李小赛等(2013)；班怒带西段数据来自江军华等(2011)；张志等(2013, 2017)；李华亮等(2014)；张硕等(2014)；关俊雷等(2014)；秦雅东等(2015)
Fig. 10. Digrams of Y vs. Nb (a), Rb vs. (Y+Nb) (b), R1 vs. R2 (c), Rb/10 vs. Hf vs. 3×Ta (d), 207Pb/204Pb vs. 206Pb/204Pb (e) and 208Pb/204Pb vs. 206Pb/204Pb (f) of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
图 11 班公湖-怒江缝合带80 Ma左右花岗质岩体分布简图
据宋扬等(2014)修改.BNSZ.班公湖-怒江缝合带；YZSZ.雅鲁藏布江缝合带
Fig. 11. Distribution of the granitic pluton in BNSZ at about 80 Ma
表 1 西藏双湖县玛日埃错地区花岗斑岩锆石LA-ICP-MS U-Pb定年结果
Table 1. Dating results of LA-ICP-MS zircon U-Pb of granite porphyry for the samples in Mariaicuo area, Shuanghu County, Tibet
样品号 含量(10-6) Th/
U同位素比值 年龄(Ma) 备注 Pb Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ R-GS-01 5.1 189.1 334.2 0.57 0.050 1 0.001 9 0.084 0 0.003 4 0.012 2 0.000 2 198.2 88.9 81.9 3.2 78.3 1.3 R-GS-02 5.7 209.1 345.8 0.61 0.050 4 0.002 1 0.085 5 0.003 6 0.012 5 0.000 2 213.0 91.7 83.3 3.3 79.8 1.0 R-GS-03 9.1 392.9 584.2 0.67 0.050 1 0.003 1 0.081 7 0.005 4 0.012 0 0.000 1 198.2 144.4 79.7 5.1 76.9 0.8 R-GS-04 7.9 326.9 500.8 0.65 0.050 0 0.001 6 0.082 8 0.002 6 0.012 2 0.000 1 194.5 108.3 80.8 2.4 78.3 0.9 R-GS-05 6.4 240.9 403.1 0.60 0.047 2 0.001 9 0.079 4 0.003 0 0.012 6 0.000 2 57.5 92.6 77.6 2.9 80.6 1.3 R-GS-06 8.8 364.7 547.3 0.67 0.049 9 0.001 6 0.084 5 0.002 6 0.012 5 0.000 2 190.8 71.3 82.3 2.5 79.8 1.0 R-GS-07 4.8 255.2 282.4 0.90 0.078 9 0.005 6 0.125 9 0.008 2 0.012 3 0.000 3 1168.5 142.6 120.4 7.4 78.9 1.8 排除 R-GS-08 10.7 408.6 666.0 0.61 0.049 2 0.001 5 0.0833 0.002 6 0.012 3 0.000 1 1 66.8 74.1 81.2 2.4 79.1 0.8 R-GS-09 14.9 626.0 944.8 0.66 0.071 3 0.002 4 0.114 8 0.004 0 0.011 6 0.000 1 966.4 66.7 110.3 3.7 74.7 0.8 排除 R-GS-10 8.7 327.4 563.2 0.58 0.046 6 0.001 8 0.076 6 0.002 8 0.012 1 0.000 1 27.9 92.6 75.0 2.7 77.2 0.9 R-GS-11 7.1 290.9 441.5 0.66 0.049 6 0.002 1 0.082 2 0.003 1 0.012 4 0.000 2 176.0 128.7 80.2 2.9 79.1 1.0 R-GS-12 10.2 452.6 635.8 0.71 0.048 5 0.001 6 0.081 2 0.002 7 0.012 2 0.000 1 124.2 77.8 79.3 2.5 78.2 0.8 R-GS-13 7.7 297.9 497.5 0.60 0.049 3 0.001 9 0.081 8 0.002 9 0.012 3 0.000 1 161.2 88.9 79.8 2.7 78.8 0.9 R-GS-14 7.3 260.1 463.8 0.56 0.054 9 0.001 9 0.092 2 0.003 1 0.012 3 0.000 1 405.6 77.8 89.6 2.9 79.0 1.0 排除 R-GS-15 6.7 275.6 424.9 0.65 0.049 4 0.002 0 0.082 4 0.003 3 0.012 3 0.000 1 164.9 96.3 80.4 3.1 78.8 0.9 R-GS-16 11.2 572.5 688.8 0.83 0.049 1 0.001 5 0.080 6 0.002 3 0.012 1 0.000 1 150.1 78.7 78.7 2.2 77.3 0.7 R-GS-17 12.1 550.9 767.0 0.72 0.048 4 0.001 4 0.080 6 0.002 4 0.012 1 0.000 1 120.5 68.5 78.7 2.2 77.6 0.8 R-GS-18 7.6 243.0 511.2 0.46 0.048 0 0.001 6 0.079 5 0.002 6 0.012 2 0.000 1 101.9 71.3 77.7 2.4 77.9 0.9 R-GS-19 11.7 595.3 706.1 0.83 0.047 9 0.001 4 0.079 7 0.002 2 0.012 2 0.000 1 100.1 70.4 77.8 2.1 78.3 0.8 R-GS-20 10.6 415.6 663.1 0.63 0.055 2 0.001 7 0.091 8 0.002 6 0.012 3 0.000 1 420.4 68.5 89.2 2.4 78.8 0.9 排除 R-GS-21 10.9 518.2 663.3 0.78 0.047 6 0.001 4 0.079 2 0.002 4 0.012 1 0.000 1 79.7 70.4 77.4 2.2 77.6 0.9 R-GS-22 8.8 367.0 551.0 0.67 0.048 2 0.001 6 0.080 5 0.002 6 0.012 2 0.000 1 109.4 78.7 78.6 2.4 78.5 0.8 R-GS-23 11.5 631.2 707.7 0.89 0.048 1 0.001 6 0.077 8 0.002 5 0.011 9 0.000 1 105.6 75.0 76.1 2.4 76.1 0.7 R-GS-24 9.9 332.2 649.5 0.51 0.047 9 0.001 6 0.079 2 0.002 5 0.012 1 0.000 1 100.1 77.8 77.4 2.3 77.8 0.8 R-GS-25 10.2 445.7 642.2 0.69 0.048 1 0.001 4 0.081 0 0.002 4 0.012 3 0.000 1 101.9 70.4 79.1 2.3 78.9 0.9 
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表 2 西藏双湖县玛日埃错地区花岗斑岩主量元素(%)、稀土元素(10-6)和微量元素(10-6)测试结果及有关参数
Table 2. Compositions of major elements (%), REE (10-6) and trace elements (10-6) of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
Sample γ-HX1 γ-HX2 γ-HX3 γ-HX4 γ-HX5 γ-HX6 SiO2 70.27 70.83 69.73 70.36 69.52 71.68 TiO2 0.27 0.27 0.27 0.28 0.27 0.28 Al2O3 14.68 14.40 14.67 14.46 14.55 14.81 Fe2O3T 0.99 1.74 1.43 1.18 1.96 1.12 MnO 0.01 0.02 0.02 0.01 0.03 0.01 MgO 0.28 0.27 0.46 0.25 0.29 0.29 CaO 2.64 2.09 2.74 2.84 2.77 1.72 Na2O 3.66 3.54 3.85 3.50 3.71 3.92 K2O 3.03 2.86 3.02 2.97 2.84 2.85 P2O5 0.09 0.11 0.08 0.08 0.07 0.11 LOl 3.31 3.34 3.30 3.75 3.61 2.59 Total 99.23 99.47 99.57 99.68 99.62 99.38 N/K 1.21 1.24 1.27 1.18 1.31 1.38 A/CNK 1.04 1.13 1.01 1.02 1.02 1.17 DI 83.81 84.58 82.8 82.84 82.02 86.88 Mg# 35.91 23.51 38.92 29.56 22.67 33.90 σ43 1.64 1.47 1.77 1.53 1.62 1.60 R1 2 753 2 852 2 626 2 827 2 701 2 770 R2 609 541 627 625 621 505 La 21.50 21.82 20.99 20.60 21.92 21.32 Ce 40.94 41.78 40.11 38.83 41.48 40.13 Pr 4.13 4.21 4.04 3.95 4.19 4.03 Nd 13.59 13.80 13.26 12.89 13.77 13.22 Sm 2.31 2.41 2.29 2.21 2.38 2.29 Eu 0.74 0.77 0.66 0.70 0.77 0.72 Gd 1.98 2.07 1.93 1.89 2.02 1.94 Tb 0.26 0.27 0.25 0.25 0.27 0.26 Dy 1.43 1.49 1.38 1.38 1.47 1.41 Ho 0.27 0.29 0.25 0.26 0.28 0.26 Er 0.74 0.77 0.66 0.70 0.77 0.72 Tm 0.10 0.11 0.09 0.10 0.11 0.10 Yb 0.68 0.72 0.56 0.67 0.70 0.67 Lu 0.10 0.11 0.08 0.10 0.11 0.10 ∑REE 88.77 90.63 86.56 84.53 90.23 87.18 LREE 83.21 84.78 81.35 79.17 84.50 81.71 HREE 5.57 5.84 5.21 5.36 5.73 5.47 LREE/HREE 14.94 14.51 15.60 14.77 14.75 14.95 LaN/YbN 22.73 21.67 26.79 22.06 22.34 22.94 δEu 1.03 1.03 0.94 1.02 1.04 1.02 δCe 1.00 1.00 1.00 0.99 0.99 0.99 Li 65.598 76.771 56.196 70.974 64.854 85.086 P 402.508 447.332 394.570 392.020 386.750 435.540 Sc 4.170 4.299 3.888 3.812 4.100 4.185 Ti 1 596.27 1 663.10 1 573.56 1 494.00 1 509.48 1 598.58 V 31.13 32.68 29.90 28.57 29.45 29.56 Cr 20.06 24.56 18.86 16.13 22.03 24.30 Mn 100.05 231.56 165.95 102.85 235.98 75.16 Co 2.53 0.98 0.41 2.50 0.44 2.10 Ni 10.10 17.47 13.06 12.40 12.09 11.93 Cu 16.71 15.58 17.28 15.22 15.57 14.60 Zn 24.47 35.67 35.50 18.24 38.12 23.46 Ga 16.12 16.18 15.78 15.19 15.34 16.02 Rb 112.68 106.48 108.34 102.87 101.68 105.95 Sr 198.04 194.96 180.54 196.92 207.18 203.76 Zr 137.69 151.96 50.84 137.90 140.06 141.22 Y 8.91 9.43 8.29 8.62 9.24 8.77 Nb 6.12 6.33 6.06 5.79 5.85 6.08 Cs 4.93 4.15 4.63 4.18 4.32 4.46 Ba 718.87 391.24 649.80 802.80 534.20 1 483.40 Hf 3.34 3.66 1.50 3.30 3.38 3.39 Ta 0.39 0.39 0.39 0.41 0.37 0.39 Pb 15.09 14.74 14.48 13.74 13.92 13.62 Th 11.51 11.75 11.17 11.20 11.71 11.90 U 2.27 2.45 2.26 2.20 2.38 2.02 注：A/CNK=Al2O3/(CaO+Na2O+K2O)摩尔比；Mg#=100×(MgO/40.31)/(MgO/40.31+Fe2O3T×2/159.7)；σ=(Na2O+ K2O)2/(SiO2-43)；DI=Qz+Or+Ab+Ne+Lc+Kp.
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表 3 西藏双湖县玛日埃错地区花岗斑岩Sr-Nd同位素分析结果
Table 3. Results of Sr-Nd isotope analyses of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
样品 t
(Ma)Rb
(10-6)Sr
(10-6)87Rb/
86Sr87Sr/
86Sr2σ
(10-6)(87Sr/
86Sr)iSm
(10-6)Nd
(10-6)143Sm/
144Nd143Nd/
144Nd2σ
(10-6)(143Nd/
144Nd)iεNd
(t)tDM1
(Ma)tDM2
(Ma)fSm/Nd g-HX1 78.3 112.68 198.04 1.641 998 0.707 89 16 0.706 07 2.31 13.59 0.102 88 0.512 685 9 0.512 632 1.9 640 729 -0.48 g-HX2 78.3 106.48 194.96 1.576 324 0.707 01 11 0.705 25 2.41 13.80 0.105 44 0.512 668 8 0.512 614 1.5 679 758 -0.46 g-HX3 78.3 108.34 180.54 1.731 888 0.707 36 11 0.705 43 2.29 13.26 0.104 35 0.512 672 6 0.512 619 1.6 667 751 -0.47 g-HX4 78.3 102.87 196.92 1.507 632 0.707 11 13 0.705 44 2.21 12.89 0.103 58 0.512 670 6 0.512 617 1.6 665 754 -0.47 g-HX5 78.3 101.68 207.18 1.416 422 0.707 04 16 0.705 46 2.38 13.77 0.104 57 0.512 709 8 0.512 655 2.3 617 692 -0.47 g-HX6 78.3 105.95 203.76 1.500 618 0.707 43 11 0.705 76 2.29 13.22 0.104 63 0.512 687 7 0.512 633 1.9 648 727 -0.47 注：Sm、Nd含量及147Sm/144Nd比值均是依据微量元素的ICPMS分析结果及公式换算得到的.参数87Sr/86Sr初始比值=0.705 4，(143Nd/144Nd)DM/CHUR=0.512 638；(147Sm/144Nd)DM=0.213 7，λ=6.54×10-12 a-1(Lugmair and Marti, 1978).
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表 4 西藏双湖县玛日埃错地区花岗斑岩Pb同位素分析结果
Table 4. Results of Pb isotope analyses of granite porphyry in Mariaicuo area, Shuanghu County, Tibet
样品 t
(Ma)U
(10-6)Th
(10-6)Pb
(10-6)206Pb/
204Pb2σ 207Pb/
204Pb2σ 208Pb/
204Pb2σ (206Pb/
204Pb)t(207Pb/
204Pb)t(208Pb/
204Pb)tg-HX1 78.3 2.27 11.51 15.09 18.653 0.000 6 15.627 0.000 6 38.864 0.001 9 18.522 15.621 38.652 g-HX2 78.3 2.45 11.75 14.74 18.666 0.000 7 15.630 0.000 7 38.898 0.002 2 18.522 15.623 38.677 g-HX3 78.3 2.26 11.17 14.48 18.660 0.000 7 15.627 0.000 8 38.875 0.002 2 18.525 15.621 38.661 g-HX4 78.3 2.20 11.20 13.74 18.663 0.000 7 15.630 0.000 7 38.882 0.002 1 18.524 15.623 38.656 g-HX5 78.3 2.38 11.71 13.92 18.672 0.000 7 15.631 0.000 6 38.892 0.001 9 18.523 15.624 38.659 g-HX6 78.3 2.02 11.90 13.62 18.644 0.000 7 15.628 0.000 7 38.899 0.001 9 18.516 15.622 38.657
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表 5 班公湖-怒江成矿带80 Ma左右花岗质侵入岩体特征对比
Table 5. Comparison of the granitic pluton in Bangonghu-Nujiang suture zone at about 80 Ma
序号 地区 岩性 年龄(Ma) 源区性质及岩石成因 构造环境 来源 1 班戈县雪如岩体 似斑状二长花岗岩 79.7 下地壳石榴石角闪岩相-斜长角闪岩相镁铁质岩石部分熔融形成 后碰撞 高顺宝等，2011b 2 班戈县雪如、查朗拉、更乃矿床 似斑状二长花岗岩、斜长花岗岩 79.7~76.1 下地壳石榴石角闪岩相-斜长角闪岩相镁铁质岩石部分熔融形成 同碰撞 王江朋等，2012；李小赛等，2013 3 雄巴岩体 花岗闪长岩 77.4、79.8 / 后碰撞 定立等，2012 4 冈底斯西北缘 石英二长岩 85.6 地幔软流圈底辟作用造成先存的构造薄弱带发生地壳线性热隆伸展和部分熔融 洋陆转换、热隆伸展 李华亮等，2014 5 尕尔穷、嘎拉勒 石英闪长玢岩、花岗闪长岩 87.1、88 成矿物质来源具有地幔与壳源混源特征 伸展构造环境 唐菊兴等，2013；张志等, 2013, 2017；姚晓峰等，2013 6 日松岩体、甲维岩脉 花岗闪长岩、英云闪长岩、花岗闪长玢岩 82、90.7 可能与加厚下地壳熔融以及幔源玄武质岩浆底侵作用有关 板内伸展环境 张硕等，2014 7 日土南拉梅拉山口 花岗岩体(钾长花岗岩、二长花岗岩、花岗闪长岩) 79.4、81、81.3 富角闪石的下地壳，既有新生地壳，又有古老基底地壳构成的混合地壳发生部分熔融而形成 南向俯冲碰撞的产物 关俊雷等，2014 8 班公湖地区日土县一带 闪长玢岩或石英闪长玢岩、花岗斑岩 76.9、79.6 花岗斑岩岩浆源区较浅，斜长石和角闪石残留；闪长玢岩岩浆形成于更大的深度，源区以榴辉岩或石榴石角闪岩相 伸展环境 江军华等，2011 9 班公湖地区蛇绿混杂岩带内 斜长花岗斑岩和花岗闪长岩、辉石闪长岩脉 97.4、91.9、80~76 斜长花岗斑岩和花岗闪长岩推测为玄武质岩浆底侵加厚下地壳部分熔融形成、辉石闪长岩脉源区为经过熔体交代的上地幔 在97~92 Ma为同碰撞环境；92 Ma后，挤压转变为伸展；80~76 Ma，伸展加剧 秦雅东等，2015 注：“/”表示原文出处无此项内容.
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