云南金平晚二叠纪玄武岩特征及其与峨眉地幔柱关系——地球化学证据
Late Permian flood basalts at Jinping area and its relation to Emei mantle plume: geochemical evidences.
-
摘要: 分布于哀牢山－红河断裂带西南侧的金坪上二叠统玄武岩属于低钛拉斑玄武岩（LT）（Ti/Y＜500）。其地球化学特征总体与洋岛玄武岩（OIB）相似，根据其岩相学、主量元素，微量元素特征，将其划分为LT1和LT2两个地球化学亚类型，它们的分布和主要地球化学标志为：LT1分布于下部，高Mg^#(48-63),SiO2(50%-56%)，高∑REE(118-145μg/g）、低Fe2O3（1．36％－1．63％），Na2O(1.88%-3.17%)，TiO2(1.37%-1.92%)，高Th、U，低Nb,Ta和Sr负异常；LT2分布于上部，低SiO2(47%-56%)，Sr强负异常，二者地球化学特征的差异是同一母岩浆经不同的分离结晶和同化混染作用的结果，金平与宾川峨眉山的化学地层学对比表明，金平LT1和LT2玄武岩与宾川峨眉山玄武岩下部的LT1、LT2十分相似，它们可能是同时，或在类似的环境下形成，金平玄武岩属于峨眉山大火山岩省的一部分，同为峨眉地幔柱早期活动的产物。新生代哀牢山－红河断裂的左滑剪运动导致了宾川与金平玄武岩的错位。
-
Key words:
- Basalts /
- Low-Ti basalts /
- Geochemistry /
- Petrogenesis /
- Emei mantle plume
-
-
[1] ［1］Allen CR, Gillespie AR, Han Y, Sieh KE, Zhang LB and Zhu C. 1984. Red River and associated faults, Yunnan Province, China: Quaternary geology slip rates and seismic hazard: Geological Society of America Bulletin, 95:686-700
[2] ［2］Chung SL, Jahn BM. 1995. Plume-lithosphere interaction in generation of the Emeishan flood basalts at the Permian-Trassic boundary. Geology, 23: 889～892
[3] ［3］Chung SL, Lee TY, Lo CH, Wang PL, Chen CY. 1997. Intraplate extension prior to continental extrusion along the Ailaoshan-red River shear zone. Geology. 25(4):311-314
[4] ［4］Chung SL, Jahn BM, Wu GY et al. 1998. The Emeishan flood basalt in SW China: A mantle plume initiation model and its connection with continental break-up and mass extinction at the Permian-Triassic boundary. In: Flower M, Chung SL, Lo GH et al.(eds.). Mantle dynamics and plate interaction in east Asia. Washington D C: AGU Monography 27: 47～58
[5] ［5］Cong BL. 1988. Formation and evolution of the Panxi paleorift: Beijing: Science Press, 424p
[6] ［6］Ellam RM. 1992. Lithospheric thickness as a control on basalt geochemistry. Geology. 20:153-156
[7] ［7］Garland FE, Turner SP, Hawkesworth CJ. 1996. Shifts in the source of Parana basalts through time. Lithos. 37:223-243
[8] ［8］Harrison TM, Leloup PH, Ryerson FJ, Tapponnier P, Lacassin R and Wenji C. 1996. Diachronous initiation of transtension along the Ailao Shan-Red River shear zone, Yunnan and Vietnam. In: Yin A and Harrison TM (eds.). The tectonic evolution of Asia. New York: Cambridge University Press, 205-226
[9] ［9］Hemond C, Arndt NT, Lichtenstein U, Hofmann AW, Oskarsson N and Steinthorsson S. 1993. The heterogeneous Iceland plume: Nd-Sr-O isotope and trace element constrains. Journal of Geophysical Research, 98:15833-15850
[10] ［10］Huang KN, Yang RY and Wang XC. 1988. A preliminary study on trace element geochemistry of Emeishan basalts from SW China. Acta Petrologica Sinica. 4:49-60 (in Chinese with English abstract)
[11] ［11］Keer A. 1994. Lithosphere thinning during the evolution of continental large igneous provinces: a case study from North Atlantic Tertiary province. Geology. 22:1027-1039
[12] ［12］Klein EM and Langmuir CH. 1987. Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness. J. Geophys. Res., 92:8089-8115
[13] ［13］Leloup PH, Harrison TM, Ryerson FJ, Chen W, Li Q, Tapponnier P and Lacassin R. 1993. Structural, petrological and thermal evolution of a Tertiary ductile strike-slip shear zone, Diancang Shan, Yunnan. Journal of Geophysical Research. 98: 6715-6743
[14] ［14］Leloup PH and nine others. 1995. The Ailao Shan-Red River shear zone (Yunnan. China). Tertiary transform boundary of Indochina: Tectonophysics. 251:3-84
[15] ［15］Liu Y, Liu HC, and Li XH. 1996. Simultaneous and precise determination of 40 trace elements in rock samples using ICP-MS. Geochimica. 25(6):552-558 (in Chinese)
[16] ［16］Plank T and Langmuir CH. 1998. The chemical composition of subducting sediment and its consequences for the crust and mantle: Chemical Geology, 145:325-394
[17] ［17］Rangin C, Klein M, Roques D, Le Pichon X and Le VT. 1995. The Red River fault system in the Tonkin Gulf, Vietnam: Tectonophysics. 243:209-222
[18] ［18］Ren JS, Jin XC. 1996. New observation of the Red River fault. Geological Review, 42(5):439-442 (in Chinese with English abstract)
[19] ［19］Saunders AD, Norry MJ and Tarney J. 1988. Origin of MORB and chemically-depleted mantle reservoirs: Trace-element constraints. Journal of Petrol., (Spec. Lithosphere Issue), 415-445
[20] ［20］Saunders AD, Norry MJ and Tarney J. 1991. Fluid inclusion on the trace element compositions of subduction zone magmas: Philosophical Transactions of the Royal Society, London, v. A335:337-392
[21] ［21］Song XY, Zhou MF, Hou ZQ, Cao ZM, Wang YL, Li YG. 2001. Geochemical constraints on the mantle source of the upper Permian Emeishan continental flood basalt, Southwestern China. International Geology Review. 43:213-225
[22] ［22］Tapponnier P, Peltzer G, Armijo R, Le Dain, AY and Cobbold P. 1982. Propagating extrusion tectonics in Asia: New insights from simple experiments with plasticine: Geology. 10:611-616
[23] ［23］Tapponnier P and nine others. 1990. The Ailao Shan -Red River metamorphic belt: Tertiary left-lateral shear zone between Indochina and South China: Nature. 343:431-437
[24] ［24］Tapponnier P and Molnar P. 1976. Slip-line field theory and large scale continental tectonics, Nature, 264: 319-324
[25] ［25］Wang YL, Zhang CJ and Xiu SZ. 2001. Th/Hf-Ta/Hf identification of tectonic setting of basalts. Acta Petrologica Sinica, 17(3): 413-421(in Chinese with English abstract)
[26] ［26］Wang YZ, Li XL, Dun LL, Huang ZX et al. 2000. Geotectonics and metallogeny in the south Nujiang-Lancangjiang-Jinshajiang Rivers area. Beijing: Geological Publishing House. 123p(in Chinese)
[27] ［27］Wilson M. 1989. Igneous Petrogenesis - A global tectonic approach. Unwin Hyman, London, 466p
[28] ［28］Wooden JL, Czamanske GK, Fedorenko VA, Arndt NT, Chauvel C, Bouse RM, King B-.SW, Knight RJ and Siems DF, 1993. Isotopic and trace-element constraints on mantle and crustal contributions to Siberian continenetal flood basalts, Noril\'sk area, Siberia. Geochim. Cosmochim. Acta, 57:3677-3704
[29] ［29］Wu GY. 1993. Permian basalts in Lijiang and Jinping, western Yunnan: A comparative study and its geological significance. Acta Petrologica Sinica, 9(supp.): 63-69
[30] ［30］Wu HW, Zhang LS and Ji SC. 1989. The Red River-Ailaoshan fault zone-a Himalayan large sinistral strike slip intracontinenatl shear zone. Scientia Geologica Sinica. 10(1):1-7(in Chinese)
[31] ［31］Xiao L, Xu YG, Mei HJ, Sha SL. 2002. Geochemistry of Emeishan flood basalts at Binchuan area, SW China: rock types and temporal evolution. Chinese Journal of Geology. (in press)
[32] ［32］Xu YG, Chung SL, Bor-ming Jahn, Genyao Wu. 2001. Petrologic and geochemical constrints on the petrogenesis of Permian-Triassic Emeishan flood basalts in southwestern China. Lithos, 58:145-168
[33] ［33］Xu YG and Chung SL. 2001. The Emeishan large igneous province: evidence for mantle plume activity and melting conditions. Geochimica, 30(1):1-9(in Chinese whth English abstract)
[34] ［34］Zhang YX, Luo YN and Yang ZX. 1988. Panxi Rift. Beijing: Geological Publishing House. 466p(in Chinese)
[35] ［35］Zhong DL, Tapponnier P, Wu HW et al. 1989. Large strike-slip fault-significant post-intercontinental deformation pattern. Chinese Science Bulletin. 7:526-529(in Chinese)
[36] ［36］黄开年, 杨瑞英,王小春. 1988. 峨眉山玄武岩微量元素地球化学的初步研究. 岩石学报, (4):49-60
[37] ［37］刘颖,刘海臣,李献华. 1996. 用ICP-MS准确测定岩石样品中的40余种微量元素. 地球化学,25(6):553-558
[38] ［38］任纪舜,金小赤. 1996. 红河断裂的新观察. 地质评论,42(5):439-442
[39] ［39］汪云亮,张成江,修淑芝. 2001. 玄武岩类形成的大地构造环境的Th/Hf - Ta/Hf图解判别. 岩石学报, 17(3): 413-421
[40] ［40］王义昭,李兴林,段丽兰. 2000. 三江地区南段大地构造与成矿. 北京:地质出版社, 123p
[41] 吴海威,张连生,嵇少丞. 1989. 红河-哀牢山断裂带-喜山期陆内大型左行滑剪切带. 地质科学,10(1):1-7
[42] ［42］吴根耀. 1993. 滇西丽江和金平二叠纪玄武岩:对比研究和地质意义,岩石学报,9(增刊):63-69
[43] ［43］肖龙,徐义刚,梅厚钧,沙绍礼. 2002. 云南宾川地区峨眉山玄武岩地球化学特征:岩石类型及随时间演化规律. 地质科学,(出版中)
[44] 徐义刚,钟孙霖. 2001. 峨眉山大火成岩省:地幔柱活动的证据及其熔融条件. 地球化学. 30(1):1-9
[45] ［45］张云湘,骆耀南,杨崇喜. 1988. 攀西裂谷. 北京:地质出版社. 1-466
[46] ［46］钟大赉,Tapponnier,吴海威. 1989. 大型走滑断层-碰撞后陆内变形的重要形式. 科学通报, 7:26-529
-
计量
- 文章访问数: 9124
- PDF下载数: 9540
- 施引文献: 0
下载: