冀南綦村岩体斑状黑云母角闪闪长岩的成因矿物学研究
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摘要
綦村岩体是冀南邯邢地区典型的中生代高镁闪长岩杂岩体,主要由斑状黑云母角闪闪长岩、角闪闪长岩、闪长岩、二长岩和少量辉长岩组成。对綦村斑状黑云母角闪闪长岩进行了较为详细的成因矿物学研究,探讨了其成因及其地质意义。研究发现,綦村斑状黑云母角闪闪长岩中的角闪石多为镁铝钙闪石和镁角闪石;黑云母主要为富镁黑云母;斜长石发育环带结构,核部以中长石和拉长石为主,边部多为更长石。角闪石矿物温压计估算结果显示,角闪石斑晶的形成温度为930～970℃,压力介于300～340 MPa之间,深度10～15 km,氧逸度为ΔNNO+0. 1～+2. 3,平衡熔融体中的水含量4. 8%～5. 5%;与黑云母平衡的角闪石形成温度为684～760℃,压力降低至42～61 MPa,熔体中水含量降至3. 1%～4. 3%,氧逸度为ΔNNO+0. 7～+2. 4。黑云母温度计和氧逸度计获得的结果与角闪石温压计估算结果一致。该结果表明,研究区高氧逸度的铁镁质岩浆在中地壳曾经驻留,并发生了以角闪石为主的结晶分异,富含挥发分的分异岩浆在后期快速侵位形成高镁闪长岩和矽卡岩型铁矿。
The Qicun pluton is a representative Mesozoic high-Mg diorite complex in the southern Taihang Mountains. It is mainly composed of porphyritic biotite hornblende diorite,hornblende diorite,gabbro-diorite and monzonite. In this study,formation and mineralogy of porphyritic biotite hornblende diorite in Qicun is studied in detail to reveal its petrogenesis and geological significance. We found that the hornblende belongs mainly to magnesiohornblende and magnesiohastingsite,and the biotite is magnesiobiotite. The core of the plagioclase is mainly andesine and labradorite,and the rim is mostly oligoclase. Hornblende thermobarometry shows that the hornblende phenocrysts were formed at 930-970 ℃ and 300-340 MPa,corresponding to crustal depth of ca. 10-15 km,with fO_2 of ΔNNO + 0. 1 to + 2. 3 and magma water content of 4. 8%-5. 5%.Hornblende,associated with biotite that represents the final magma solidification,was formed at 684-760 ℃and 42-61 MPa,with magma water contents decreased to 3. 1%-4. 3%,and slightly elevated fO_2( ΔNNO +0. 7 to + 2. 4). Additionally,results of biotite thermometry are in good agreement with those of the hornblende thermobarometry,supporting that the estimation of magma-forming conditions are reliable. Consequently,we suggested that the high-Mg magma in Qichun area with high oxygen fugacity was temporarily stored in the middle crust,and underwent hornblende-dominated fractionation. The volatile-rich magma was then rapidly emplaced and formed the high-Mg diorite and the associated iron skarn deposits.
The Qicun pluton is a representative Mesozoic high-Mg diorite complex in the southern Taihang Mountains. It is mainly composed of porphyritic biotite hornblende diorite,hornblende diorite,gabbro-diorite and monzonite. In this study,formation and mineralogy of porphyritic biotite hornblende diorite in Qicun is studied in detail to reveal its petrogenesis and geological significance. We found that the hornblende belongs mainly to magnesiohornblende and magnesiohastingsite,and the biotite is magnesiobiotite. The core of the plagioclase is mainly andesine and labradorite,and the rim is mostly oligoclase. Hornblende thermobarometry shows that the hornblende phenocrysts were formed at 930-970 ℃ and 300-340 MPa,corresponding to crustal depth of ca. 10-15 km,with fO_2 of ΔNNO + 0. 1 to + 2. 3 and magma water content of 4. 8%-5. 5%.Hornblende,associated with biotite that represents the final magma solidification,was formed at 684-760 ℃and 42-61 MPa,with magma water contents decreased to 3. 1%-4. 3%,and slightly elevated fO_2( ΔNNO +0. 7 to + 2. 4). Additionally,results of biotite thermometry are in good agreement with those of the hornblende thermobarometry,supporting that the estimation of magma-forming conditions are reliable. Consequently,we suggested that the high-Mg magma in Qichun area with high oxygen fugacity was temporarily stored in the middle crust,and underwent hornblende-dominated fractionation. The volatile-rich magma was then rapidly emplaced and formed the high-Mg diorite and the associated iron skarn deposits.
引文
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[2]翟明国,孟庆任,刘建明,等.华北东部中生代构造体制转折峰期的主要地质效应和形成动力学探讨[J].地学前缘,2004,11(3):285-297.
[3]徐义刚,李洪颜,庞崇进,等.论华北克拉通破坏的时限[J].科学通报,2009,54(14):1974-1989.
[4]吴福元,徐义刚,朱日祥,等.克拉通岩石圈减薄与破坏[J].中国科学:地球科学,2014,44(11):2358-2372.
[5]李冰,胡道功,陈宣华,等.北祁连缝合带油葫芦沟蛇绿岩中花岗斑岩锆石U-Pb年龄及地质意义[J].现代地质,2017,31(6):1170-1176.
[6]任永健,程烁,朱敬宾,等.黑龙江省张广才岭南部早侏罗世花岗岩暗色微粒包体成因研究[J].现代地质,2017,31(1):35-47.
[7]姚宏鑫,吕古贤,聂江涛,等.江西相山铀矿田邹家山铀矿床蚀变特征及热液来源[J].现代地质,2013,27(2):332-338.
[8]王亚莹,蔡剑辉,阎国翰,等.山西临县紫金山岩体地球化学、矿物学特征及岩体成因[J].现代地质,2015,29(4):896-911.
[9] ZHANG J Q,LI S R,SANTOSH M,et al. Mineral chemistry of high-Mg diorites and skarn in the Han-Xing Iron deposits of SouthTaihang Mountains,China:Constraints on mineralization process[J]. Ore Geology Reviews,2015,64(1):200-214.
[10]匡瑞亭.綦村闪长—二长岩体地质特征[J].石家庄经济学院学报,1982(4):37-43.
[11]孔源.河北省沙河市綦村铁矿田邯邢式铁矿成矿地质特征及找矿方向[D].石家庄:石家庄经济学院,2014:1-99.
[12]罗照华,邓晋福,赵国春,等.太行山造山带岩浆活动特征及其造山过程反演[J].地球科学,1997,22(3):279-284.
[13]陈斌,田伟,翟明国,等.太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义[J].岩石学报,2005,21(1):13-24.
[14] LI S R,SANTOSH M,ZHANG H F,et al. Inhomogeneous lithospheric thinning in the central North China Craton:Zircon U-Pb and S-He-Ar isotopic record from magmatism and metallogeny in the Taihang Mountains[J]. Gondwana Research,2013,23:141-160.
[15] SHEN J F,LI S R,SANTOSH M,et al. Zircon U-Pb geochronology of the basement rocks and dioritic intrusion associated with theFushan skarn iron deposit,southern Taihang Mountains,China[J]. Journal of Asian Earth Sciences,2015,113:1132-1142.
[16] SHEN J F,SANTOSH M,LI S R,et al. The Beiminghe skarn iron deposit,eastern China:geochronology,isotope geochemistry and implications for the destruction of the North China Craton[J]. Lithos,2013,156/159:218-229.
[17]权瑞,董国臣,缪广,等.太行山南段洪山矿化正长斑岩LA-ICP-MS锆石U-Pb年龄、Hf同位素组成及地球化学特征[J].地质论评,2016,62(4):1064-1080.
[18]李家骥.河北綦村铁矿区构造特征与控矿构造[J].中国海洋大学学报(自然科学版),1981(4):89-97.
[19] DENG X D,LI J W,WEN G. U-Pb Geochronology of hydrothermal zircons from the Early Cretaceous Iron Skarn Deposits in the Handan-Xingtai District,North China Craton[J]. Economic Geology,2015,110(8):2159-2180.
[20] LEAKE B E,WOOLLEY A R,ARPS C E S,et al. Nomenclature of amphiboles[M]//Subcommittee on Amphiboles of the International Mineralogical Association,Commission on New Minerals and Mineral Names International Conference on Formal Concept Analysis. Report of the Subcommittee on Amphiboles of the International Mineralogical Association,Commission on New Minerals and Mineral Names. Berlin,Heidelberg:Springer,1997:181-196.
[21]周作侠.侵入岩的镁铁云母化学成分特征及其地质意义[J].岩石学报,1988,4(3):65-75.
[22]赖绍聪,刘池阳,伊海生,等.北羌塘新生代火山岩长石矿物激光探针原位测试及其微量元素特征初探[J].地质科学,2003,38(4):539-545.
[23]庞阿娟,李胜荣,张华锋,等.湖北鸡笼山岩体主要矿物的成因矿物学意义[J].矿物岩石,2012,32(3):25-33.
[24] GINIBRE C,WORNER G. Variable parent magmas and recharge regimes of the Parinacota magma system(N. Chile)revealed by Fe,Mg and Sr zoning in plagioclase[J]. Lithos,2007,98(1):118-140.
[25]谢磊,王德滋,王汝成,等.浙江普陀花岗杂岩体中的石英闪长质包体:斜长石内部复杂环带研究与岩浆混合史记录[J].岩石学报,2004,20(6):99-110.
[26]覃锋,徐晓霞,罗照华.北京房山岩体形成过程中的岩浆混合作用证据[J].岩石学报,2006,22(12):2957-2970.
[27]吴平霄,吴金平,肖文丁,等.斜长石环带的成因机制[J].地球与环境,1997,25(4):40-49.
[28]牛之建,刘跃,狄永军.大兴安岭五岔沟地区中生代粗安岩中斜长石环带特征及其地质意义[J].岩石矿物学杂志,2014,33(1):102-108.
[29]张聚全,李胜荣,卢静.中酸性侵入岩的氧逸度计算[J].矿物学报,2018,38(1):1-14.
[30] ZHANG J Q,LI S R,SANTOSH M,et al. The magmatic-hydrothermal mineralization systems of the Yixingzhai and Xinzhuang gold deposits in the central North China Craton[J]. Ore Geology Reviews,2017,88:416-435.
[31] HAMMARSTROM J M,ZEN E. Aluminum in hornblende; an empirical igneous geobarometer[J]. American Mineralogist,1986,71(11):1297-1313.
[32] RIDOLFI F,PUERINI M,RENZULLI A,et al. The magmatic feeding system of El Reventador volcano(Sub-Andean zone,Ecuador)constrained by texture,mineralogy and thermobarometry of the2002 erupted products[J]. Journal of Volcanology&Geothermal Research,2008,176(1):94-106.
[33] RIDOLFI F,RENZULLI A,PUERINI M. Stability and chemical equilibrium of amphibole in calc-alkaline magmas:an overview,new thermobarometric formulations and application to subductionrelated volcanoes[J]. Contributions to Mineralogy&Petrology,2010,160(1):45-66.
[34]郭谱.鲁西中生代金成矿的地球动力学背景研究[D].北京:中国地质大学(北京),2014:1-99.
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